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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Мониторинг СМИ

Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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Поддерживает ввод нескольких поисковых фраз (по одной на строку). При поиске обеспечивает поддержку морфологии русского и английского языка
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Применить Всего найдено 71820. Отображено 100.
05-01-2012 дата публикации

Steel Alloy

Номер: US20120000336A1
Автор: Andreas Schremb
Принадлежит: Gebr Schmachtenberg GmbH

An alloy, such as a tool steel containing, in percent by weight, 0.5%-0.7% carbon; 1.80%-2.50% chromium; 0.90%-1.20% molybdenum; 3.50%-5.50% nickel and 0.60%-1.50% vanadium. The steel alloyed accordingly is eminently suitable for heat treatments for influencing strength. With a carbon content of less than 0.7%, a partially martensitic metal structure having a high ductility can be formed by way of hardening processes. Due to surface hardening, the carbon content may in some portions on the outer surface be greater than 0.7%.

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Номер записи: 1
26-01-2012 дата публикации

High strength steel pipe for low-temperature usage having excellent buckling resistance and toughness of welded heat affected zone and method for producing the same

Номер: US20120018028A1
Автор: Junji Shimamura, Mitsuhiro Okatsu, Nobuo Shikanai, Nobuyuki Ishikawa
Принадлежит: JFE Steel Corp

An APIX100-grade high strength steel pipe includes a base material containing, in mass percentage, C: more than 0.03% and 0.08% or less, Si: 0.01% to 0.5%, Mn: 1.5% to 3.0%, P: 0.015% or less, S: 0.005% or less, Al: 0.01% to 0.08%, Nb: 0.005% to 0.025%, Ti: 0.005% to 0.025%, N: 0.001% to 0.010%, O: 0.005% or less, and B: 0.0003% to 0.0020%, further contains one or more of Cu, Ni, Cr, Mo, and V, satisfies 0.19≦P cm ≦0.25, the balance being Fe and unavoidable impurities, and has a TS of 760 to 930 MPa, a uniform elongation of 5% or more, and a YR of 85% or less; the seam weld metal has a specific composition.

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Номер записи: 2
26-01-2012 дата публикации

Steel sheet for cans with excellent surface properties after drawing and ironing and method for producing the same

Номер: US20120018055A1
Автор: Hiroki Iwasa, Katsumi Kojima, Masaki Tada, Yusuke Nakagawa
Принадлежит: JFE Steel Corp

A component composition contains, by % by mass, 0.0016 to 0.01% of C, 0.05 to 0.60% of Mn, and 0.020 to 0.080% of Nb so that the C and Nb contents satisfy the expression, 0.4≦(Nb/C)×(12/93)≦2.5. In addition, the amount of Nb-based precipitates is 20 to 500 ppm by mass, the average grain diameter of the Nb-based precipitates is 10 to 100 nm, and the average crystal grain diameter of ferrite is 6 to 10 μm. Nb is added to ultra-low-carbon steel used as a base, and the amount and grain diameter of the Nb-based precipitates are controlled to optimize the pinning effect. Grain refinement of ferrite is achieved by specifying the Mn amount, thereby achieving softening and excellent resistance to surface roughness of steel.

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Номер записи: 3
26-01-2012 дата публикации

Process for manufacturing a cold rolled trip steel product

Номер: US20120018058A1
Автор: Bruno De Cooman, Joachim Antonissen, Liesbeth Barbe, Lucia Tosal-Martinez, Marijke De Meyer, Serge Claessens, Sigrid Jacobs, Sven Vandeputte
Принадлежит: Arcelor France SA

The present invention is related to a process comprising a cold rolling step, for the production of uncoated, electro-galvanised or hot dip galvanised TRIP steel products, hot rolling a slab of a specific composition, wherein the finishing rolling temperature is higher than the Ar3 temperature, to form a hot-rolled substrate, cooling said substrate to a coiling temperature (CT) between 500° C. and 680° C., coiling said substrate at said coiling temperature, pickling said substrate to remove the oxides, cold rolling said substrate to obtain a reduction of thickness, with a minimum reduction of 40%.

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Номер записи: 4
26-01-2012 дата публикации

Ferritic stainless steel with excellent heat resistance

Номер: US20120020827A1
Автор: Hiroki Ota, Takumi Ujiro, Tetsuyuki Nakamura, Yasushi Kato
Принадлежит: JFE Steel Corp

A ferritic stainless steel contains no expensive elements such as Mo and W, is free from the oxidation resistance loss caused by addition of Cu, and thereby has excellent levels of oxidation resistance (including water vapor oxidation resistance), thermal fatigue property, and high-temperature fatigue property. The ferritic stainless steel contains, in mass %, C at 0.015% or less, Si at 0.4 to 1.0%, Mn at 1.0% or less, P at 0.040% or less, S at 0.010% or less, Cr at 16 to 23%, Al at 0.2 to 1.0%, N at 0.015% or less, Cu at 1.0 to 2.5%, Nb at 0.3 to 0.65%, Ti at 0.5% or less, Mo at 0.1% or less, and W at 0.1% or less, the Si and the Al satisfying a relation Si (%)≧Al (%).

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Номер записи: 5
26-01-2012 дата публикации

Weld metal and welded structure having weld joints using the same

Номер: US20120021246A1
Автор: Hideaki Takauchi, Hidenori Nako, Ken Yamashita, Minoru Otsu, Yoshitomi Okazaki
Принадлежит: Kobe Steel Ltd

To provide weld metal that has a high strength and toughness in the as-welded condition or in the annealed condition. The weld metal of the present invention contains by weight %, C: 0.04-0.15%, Si: 0.50% or less, Mn: 1.0-1.9%, Ni: 1.0-4.0%, Cr: 0.10-1.0%, Mo: 0.20 to 1.2%, Ti: 0.010-0.060%, Al: 0.030% or less, O: 0.15-0.060%, N: 0.010% or less, Fe and inevitable impurities as the remaining contents. The weld metal is further characterized by the fact that the ratio of Ti content (%) to Si content (%) i.e.,[compound type Ti]/[compound type Si] is more than 1.5, and the number A defined by the following formula is 0.50 or more, wherein A=[Ti]/([O]−1.1×[Al]+0.05×[Si]).

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Номер записи: 6
09-02-2012 дата публикации

High-strength steel sheet, hot-dipped steel sheet, and alloy hot-dipped steel sheet that have excellent fatigue, elongation, and collision characteristics, and manufacturing method for said steel sheets

Номер: US20120031528A1
Автор: Koichi Goto, Kunio Hayashi, Naoki Matsutani, Nobuhiro Fujita, Toshimasa Tomokiyo
Принадлежит: Individual

This high-strength steel sheet includes: in terms of percent by mass, 0.03 to 0.10% of C; 0.01 to 1.5% of Si; 1.0 to 2.5% of Mn; 0.1% or less of P; 0.02% or less of S; 0.01 to 1.2% of Al; 0.06 to 0.15% of Ti; and 0.01% or less of N; and contains as the balance, iron and inevitable impurities, wherein a tensile strength is in a range of 590 MPa or more, and a ratio between the tensile strength and a yield strength is in a range of 0.80 or more, a microstructure includes bainite at an area ratio of 40% or more and the balance being either one or both of ferrite and martensite, a density of Ti(C,N) precipitates having sizes of 10 nm or smaller is in a range of 10 10 precipitates/mm 3 or more, and a ratio (Hvs/Hvc) of a hardness (Hvs) at a depth of 10 μm from a surface to a hardness (Hvc) at a center of a sheet thickness is in a range of 0.85 or more.

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Номер записи: 7
09-02-2012 дата публикации

Method of producing a multi-microchannel, flow-through element and device using same

Номер: US20120032366A1
Автор: Dmitri Ivniski, Vladimir SHAPOVALOV
Принадлежит: New Mexico Tech Research Foundation

A method of producing a multi-microchannel, flow-through element, including the steps of providing a body of material, and producing multiple microchannels within the body, wherein the microchannels extend through the body to produce a multi-microchannel, flow-through element. Such an element can be used as a micromixer, a sensor element, a filter, a fuel element or a chromatographic element.

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Номер записи: 8
15-03-2012 дата публикации

Article for magnetic heat exchange and method of fabricating an article for magnetic heat exchange

Номер: US20120061066A9
Автор: Matthias Katter, Volker Zellmann
Принадлежит: Vacuumschmelze GmbH and Co KG

An article for magnetic heat exchange comprising a magnetocalorically active phase with a NaZn 13 -type crystal structure is provided by hydrogenating a bulk precursor article. The bulk precursor article is heated from a temperature of less than 50° C. to at least 300° C. in an inert atmosphere and hydrogen gas only introduced when a temperature of at least 300° C. is reached. The bulk precursor article is maintained in a hydrogen containing atmosphere at a temperature in the range 300° C. to 700° C. for a selected duration of time, and then cooled to a temperature of less than 50° C.

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Номер записи: 9
22-03-2012 дата публикации

High-strength steel sheet and the method for production therefor

Номер: US20120070330A1
Автор: Astrid Frommeyer, Georg Frommeyer, Klaus Brokmeier, Masashi Ishii, Sven Leonhardt, Ursula Frommeyer, Yoshitaka Okitsu
Принадлежит: Honda Motor Co Ltd

A high-strength steel sheet comprises, by weight, not less than 0.25% and not more than 0.5% of C, not less than 4% and not more than 14% of Mn, not less than 6.5% and not more than 9.5% of Cr, and not less than 0.3% and not more than 3% of Si. The high-strength steel sheet satisfies the following formulas 1 and 2 and mainly consists of austenite, and the high-strength steel sheet has yield strength of not less than 1000 MPa and total elongation of not less than 20%. 12≦2.0Si+5.5Al+Cr+1.5Mo≦25   (1) 13 ≦30C+0.5Mn+0.3Cu+Ni+25N≦17   (2) (Each element symbol in the above formulas indicates the content (weight %) of the element)

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Номер записи: 10
22-03-2012 дата публикации

Friction stir welding and processing of oxide dispersion strengthened (ods) alloys

Номер: US20120070686A1
Автор: Weiju Ren
Принадлежит: UT Battelle LLC

A method of welding including forming a filler material of a first oxide dispersoid metal, the first oxide dispersoid material having first strengthening particles that compensate for decreases in weld strength of friction stir welded oxide dispersoid metals; positioning the filler material between a first metal structure and a second metal structure each being comprised of at least a second oxide dispersoid metal; and friction welding the filler material, the first metal structure and the second metal structure to provide a weld.

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Номер записи: 11
12-04-2012 дата публикации

Fabrication process of coated stamped parts and parts prepared from the same

Номер: US20120085467A1
Автор: Isabelle Thirion, Karl Michael Bader, Ludwig Schaller, Michael Alsmann, Pascal Drillet, Raisa Grigorieva, Thomas Vietoris, Uwe Paar
Принадлежит: ARCELORMITTAL INVESTIGACIÓN Y DESARROLLO SL

A manufacturing process of a hot stamped coated part comprising the following successive steps, in this order: providing a hot rolled or cold rolled steel sheet comprising a steel substrate and an aluminium-silicon alloy precoating, the precoating containing more than 50% of free aluminium and having a thickness comprised between 15 and 50 micrometers, then cutting the steel sheet to obtain a precoated steel blank, then heating the blank under non protective atmosphere up to a temperature T i comprised between T e −10° C. and T e , Te being the eutectic or solidus temperature of the precoating, then heating the blank from the temperature T i up to a temperature T m comprised between 840 and 950° C. under non protective atmosphere with a heating rate V comprised between 30° C./s and 90° C./s, V being the heating rate between the temperature T i and the temperature T m , in order to obtain a coated heated blank, then soaking the coated heated blank at said temperature T m for a time t m comprised between 20 s and 90 s, then hot stamping the blank in order to obtain a hot stamped coated part, then cooling said stamped part at a cooling rate in order to form a microstructure in the steel substrate comprising at least one constituent chosen among martensite or bainite.

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Номер записи: 12
26-04-2012 дата публикации

Alumina forming bimetallic tube and method of making and using

Номер: US20120097289A1
Автор: ChangMin Chun, D. Samuel Deutsch, David B. Spicer, James E. Feather, Jeffrey P. Jones
Принадлежит: ExxonMobil Research and Engineering Co

Provided is a bimetallic tube for transport of hydrocarbon feedstocks in a petrochemical process unit and/or refinery process unit, including: i) an outer tube layer being formed from a steam cracker alloy including at least 18.0 wt. % Cr and at least 10.0 wt. % Ni; ii) an inner tube layer being formed from an alumina forming bulk alloy including 5.0 to 10.0 wt. % of Al, 18.0 wt. % to 25.0 wt. % Cr, less than 0.5 wt. % Si, and at least 35.0 wt. % Fe with the balance being Ni, wherein the inner tube layer is formed plasma powder welding the alumina forming bulk alloy on the inner surface of the outer tube layer; and iii) an oxide layer formed on the surface of the inner tube layer, wherein the oxide layer is substantially comprised of alumina, chromia, silica, mullite, spinels, or mixtures thereof.

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Номер записи: 13
03-05-2012 дата публикации

HIGH Cr FERRITIC/MARTENSITIC STEELS HAVING AN IMPROVED CREEP RESISTANCE FOR IN-CORE COMPONENT MATERIALS IN NUCLEAR REACTOR, AND PREPARATION METHOD THEREOF

Номер: US20120106693A1
Автор: Chan Bock Lee, Chang Hee Han, Dohee Hahn, Jong Hyuk Baek, Jun Hwan Kim, Sung Ho Kim, Tae Kyu Kim, Woo Gon Kim, Yeong-II Kim
Принадлежит: Korea Atomic Energy Research Institute KAERI, Korea Hydro and Nuclear Power Co Ltd

Disclosed herein is a high Cr Ferritic/Martensitic steel comprising 0.04 to 0.13% by weight of carbon, 0.03 to 0.07% by weight of silicon, 0.40 to 0.50% by weight of manganese, 0.40 to 0.50% by weight of nickel, 8.5 to 9.5% by weight of chromium, 0.45 to 0.55% by weight of molybdenum, 0.10 to 0.25% by weight of vanadium, 0.02 to 0.10% by weight of tantalum, 0.21 to 0.25% by weight of niobium, 1.5 to 3.0% by weight of tungsten, 0.015 to 0.025% by weight of nitrogen, 0.01 to 0.02% by weight of boron and iron balance. By regulating the contents of alloying elements such as nitrogen, born, the high Cr Ferritic/Martensitic steel with to superior tensile strength and creep resistance is provided, and can be effectively used as an in-core component material for sodium-cooled fast reactor (SFR).

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Номер записи: 14
03-05-2012 дата публикации

High strength steel sheet and method for manufacturing the same

Номер: US20120107633A1
Автор: Katsumi Nakajima, Katsumi Yamada, Kazuhiro Seto, Koichi Nakagawa, Satoshi Kinoshiro, Takeshi Yokota, Tetsuya Mega, Yuji Tanaka
Принадлежит: JFE Steel Corp

A high-strength steel sheet includes a composition containing, in mass percent, 0.08% to 0.20% of carbon, 0.2% to 1.0% of silicon, 0.5% to 2.5% of manganese, 0.04% or less of phosphorus, 0.005% or less of sulfur, 0.05% or less of aluminum, 0.07% to 0.20% of titanium, and 0.20% to 0.80% of vanadium, the balance being iron and incidental impurities.

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Номер записи: 15
17-05-2012 дата публикации

Hic-resistant thick steel plate and uoe steel pipe

Номер: US20120121453A1
Автор: Akio Yamamoto, Izuru Minato, Nobuaki Takahashi
Принадлежит: Sumitomo Metal Industries Ltd

A thick steel plate and a UOE steel pipe having a high strength of at least X60 grade and improved resistance to HIC have a chemical composition consisting essentially of, in mass percent, C: 0.02-0.07%, Si: 0.05-0.50%, Mn: 1.1-1.6%, P: at most 0.015%, S: at most 0.002%, Nb: 0.005-0.060%, Ti: 0.005-0.030%, Al: 0.005-0.06%, Ca: 0.0005-0.0060%, N: 0.0015-0.007%, at least one of Cu, Ni, Cr, and Mo in a total amount of greater than 0.1% and less than 1.5%, and a remainder of Fe and impurities, wherein the degrees of segregation of Nb and Ti are both at most 2.0, and the ratio of (the degree of Nb segregation)/(the degree of Mn segregation) and the ratio of (the degree of Ti segregation)/(the degree of Mn segregation) are both at least 1.0 and at most 1.5.

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Номер записи: 16
24-05-2012 дата публикации

Method for heating lightweight metal ingots

Номер: US20120125569A1
Автор: Eduard Morbitzer, Robert Ebner
Принадлежит: EBNER INDUSTRIEOFENBAU GMBH

A method is described for heating lightweight metal ingots ( 1 ), with the lightweight metal ingots ( 1 ) being heated in a furnace ( 2 ) by hot burner exhaust gases. In order to provide advantageous heating conditions it is proposed that the lightweight metal ingots ( 1 ), prior to their heating in the furnace ( 2 ), are preheated via at least one preheating apparatus ( 9 ) which rests in a planar manner thereon and is supplied by a fluid heat carrier which is heated in heat exchange by the hot exhaust gases from the furnace ( 2 ) and is guided in a circuit ( 7 ).

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Номер записи: 17
31-05-2012 дата публикации

Thin cast strip product with microalloy additions, and method for making the same

Номер: US20120132323A1
Автор: Christopher Ronald Killmore, James Geoffrey Williams
Принадлежит: Nucor Corp

A steel product having, by weight, less than 0.25% carbon, between 0.20 and 2.0% manganese, between 0.05 and 0.50% silicon, aluminum 0.008% or less by weight, and at least one element selected from the group consisting of titanium between about 0.01% and about 0.20%, niobium between about 0.01% and about 0.20%, molybdenum between about 0.05% and about 0.50%, and vanadium between about 0.01% and about 0.20%, and having a microstructure comprised of a majority bainite, and fine oxide particles of silicon and iron distributed through the steel microstructure of average precipitate size less than 50 nanometers. The yield strength of the steel product may be at least 55 ksi (380 MPa) or the tensile strength of at least 500 MPa, or both. The steel product may have total elongation of at least 6% or 10%, and thickness less than 3.0 mm.

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Номер записи: 18
31-05-2012 дата публикации

Method for producing martensitic steel with mixed hardening

Номер: US20120132326A1
Автор: Laurent Ferrer, Philippe Heritier
Принадлежит: Aubert and Duval SA, SNECMA SAS

A method of producing a martensitic steel including a content of other metals such that it can be hardened by intermetallic compound and carbide precipitation, with an Al content of between 0.4% and 3%. The heat shaping temperature of a last heat shaping pass of the steel is lower than the solubility temperature of aluminum nitrides in the steel, and a treatment temperature for each potential heat treatment after the last heat shaping pass is lower than the solid-state solubility temperature of the aluminum nitrides in the steel.

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Номер записи: 19
31-05-2012 дата публикации

Metal plate to be heated by radiant heat transfer and method of manufacturing the same, and metal processed product having portion with different strength and method of manufacturing the same

Номер: US20120135263A1
Автор: Kazuyuki Kawano, Shinichi Suzuki, Shintaro Yamanaka, Yasunori Itoh, Yoshifumi Kobayashi
Принадлежит: Individual

On part of a surface of a metal plate that is to be heated by radiant heat transfer with a near-infrared ray, a region where reflectance for a radiant ray is made lower than that of the original surface of the metal plate is formed. As reflectance reducing treatment, painting or thermal spraying in a blackish color, plating in a blackish color, treatment for increasing roughness of the surface of the metal plate, blasting, etching, blackening, surface layer quality changing treatment of the metal plate, or the like can be adopted. The metal plate is turned into a heated metal plate partially having a different temperature by being heated by radiant heat transfer, and thereafter, the heated metal plate is subjected to thermal processing accompanied by cooling, for example, by hot stamping.

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Номер записи: 20
07-06-2012 дата публикации

High-strength hot-rolled steel sheet and method for manufacturing the same

Номер: US20120138197A1
Автор: Kazuhiro Seto, Masahide Watabe, Noriaki Kohsaka, Reiko Sugihara, Yasushi Tanaka
Принадлежит: JFE Steel Corp

A steel sheet contains, on a mass percent basis, 0.03%-0.12% C, 0.5% or less Si, 0.8%-1.8% Mn, 0.030% or less P, 0.01% or less S, 0.005%-0.1% Al, 0.01% or less N, 0.035%-0.100% Ti, and the balance being Fe and incidental impurities and has microstructures with a fraction of polygonal ferrite of 80% or more, the polygonal ferrite having an average grain size of 5 to 10 μm. The amount of Ti present in a precipitate having a size of less than 20 nm is 70% or more of the value of Ti* calculated using expression (1): Ti*=[Ti]−48×[N]/14  (1) where [Ti] and [N] represent a Ti content (percent by mass) and a N content percent by mass), respectively, of the steel sheet.

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Номер записи: 21
21-06-2012 дата публикации

Non-oriented electrical steel sheet

Номер: US20120156086A1
Автор: Takeshi Kubota
Принадлежит: Individual

A non-oriented electrical steel sheet contains 2.8 mass % or more and 4.0 mass % or less of Si, 0.2 mass % or more and 3.0 mass % or less of Al, and 0.02 mass % or more and 0.2 mass % or less of P. The non-oriented electrical steel sheet contains further contains 0.5 mass % or more in total of at least one kinds selected from a group consisting of 4.0 mass % or less of Ni and 2.0 mass % or less of Mn. A C content is 0.05 mass % or less, a N content is 0.01 mass % or less, an average grain diameter is 15 μm or less, and a <111> axial density is 6 or larger.

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Номер записи: 22
28-06-2012 дата публикации

High manganese containing steels for oil, gas and petrochemical applications

Номер: US20120160363A1
Автор: Douglas Paul Fairchild, Hyun Woo Jin, Mario L. Macia, Raghavan Ayer
Принадлежит: ExxonMobil Research and Engineering Co

Provided are high manganese containing ferrous based components and their use in oil, gas and/or petrochemical applications. In one form, the components include 5 to 40 wt % manganese, 0.01 to 3.0 wt % carbon and the balance iron. The components may optionally include one or more alloying elements chosen from chromium, nickel, cobalt, molybdenum, niobium, copper, titanium, vanadium, nitrogen, boron and combinations thereof.

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Номер записи: 23
12-07-2012 дата публикации

METHOD AND SYSTEM FOR PRODUCING SINTERED NdFeB MAGNET, AND SINTERED NdFeB MAGNET PRODUCED BY THE PRODUCTION METHOD

Номер: US20120176212A1
Автор: Masato Sagawa, Michiyasu Asazuma, Shinichi Hayashi, Tetsuhiko Mizoguchi
Принадлежит: Intermetallics Co Ltd

A method and system for producing a slim-shaped sintered NdFeB magnet having a high level of coercive force and high degree of orientation, as well as a sintered NdFeB magnet produced by the aforementioned method or system. A system for producing a slim-shaped sintered NdFeB magnet according to the present invention includes: a filling unit and filling alloy powder; an orienting unit; a sintering furnace; and a conveying unit. The orienting unit is provided with a heating and orienting coil for heating the alloy powder in the molds before and/or after the application of the magnetic field so as to decrease the coercive force of the individual particles of the alloy powder.

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Номер записи: 24
12-07-2012 дата публикации

Bearing steels

Номер: US20120177527A1
Автор: Aidan Michael Kerrigan, Henrik Karlsson, Mohamed Sherif
Принадлежит: SKF AB

There is provided a novel bearing steel composition and a method of forming a bearing. The bearing steel composition comprises: Carbon 0.4 to 0.8 wt %; Nitrogen 0.1 to 0.2 wt %; Chromium 12 to 18 wt %; Molybdenum 0.7 to 1.3 wt %; Silicon 0.3 to 1 wt %; Manganese 0.2 to 0.8 wt %; and Iron 78 to 86.3 wt %.

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Номер записи: 25
26-07-2012 дата публикации

High-strength seamless steel tube, having excellent resistance to sulfide stress cracking, for oil wells and method for manufacturing the same

Номер: US20120186704A1
Автор: Haruo Nakamichi, Katsumi Yamada, Kenichiro Eguchi, Mitsuo Kimura, Yasuhide Ishiguro, Yuji Tanaka
Принадлежит: JFE Steel Corp

A seamless steel tube contains 0.15% to 0.50% C, 0.1% to 1.0% Si, 0.3% to 1.0% Mn, 0.015% or less P, 0.005% or less S, 0.01% to 0.1% Al, 0.01% or less N, 0.1% to 1.7% Cr, 0.4% to 1.1% Mo, 0.01% to 0.12% V, 0.01% to 0.08% Nb, and 0.0005% to 0.003% B or further contains 0.03% to 1.0% Cu on a mass basis and has a microstructure which has a composition containing 0.40% or more solute Mo and a tempered martensite phase that is a main phase and which contains prior-austenite grains with a grain size number of 8.5 or more and 0.06% by mass or more of a dispersed M 2 C-type precipitate with substantially a particulate shape.

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Номер записи: 26
02-08-2012 дата публикации

Method for making a hot water tank of ferritic stainless steel with a tig welded structure

Номер: US20120193328A1
Автор: Akihiro Nonomura, Kouki Tomimura, Osamu Yamamoto, Toshiro Adachi
Принадлежит: Nisshin Steel Co Ltd

Disclosed is a ferritic stainless steel for hot-water tanks with welded structure, comprising, in terms of % by mass, at most 0.02% of C, from 0.01 to 0.30% of Si, at most 1% of Mn, at most 0.04% of P, at most 0.03% of S, from more than 21 to 26% of Cr, at most 2% of Mo, from 0.05 to 0.6% of Nb, from 0.05 to 0.4% of Ti, at most 0.025% of N, and from 0.02 to 0.3% of Al, and optionally containing at least one of at most 2%, preferably from 0.1 to 2% of Ni and at most 1%, preferably from 0.1 to 1% of Cu, with a balance of Fe and inevitable impurities.

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Номер записи: 27
09-08-2012 дата публикации

Nitrogen containing, low nickel sintered stainless steel

Номер: US20120201712A1
Автор: Denis Oshchepkov
Принадлежит: HOGANAS AB

A water atomized stainless steel powder which comprises by weight-%: 10.5-30.0 Cr 0.5-9.0 Ni 0.01-2.0 Mn 0.01-3.0 Sn 0.1-3.0 Si 0.01-0.4 N optionally max 7.0 Mo optionally max 7.0 Cu optionally max 3.0 Nb optionally max 6.0 V balance iron and max 0.5 of unavoidable impurities.

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Номер записи: 28
04-10-2012 дата публикации

Molybdenum-Free, High-Strength, Low-Alloy X80 Steel Plates Formed by Temperature-Controlled Rolling Without Accelerated Cooling

Номер: US20120247605A1
Автор: Amar K. De
Принадлежит: Individual

Steel alloy, plate, and longitudinally welded pipe formed from a molybdenum-free, high-strength, low-alloy steel, said steel alloy consisting essentially of, in wt. %: C: 0.05-0.09; Mn: 1.70-1.95; Ti: 0.01-0.02; Al: 0.02-0.055; Nb: 0.075-0.1; P: ≦0.015; S: ≦0.003; V 0.01-0.03; Mo: ≦0.003; and the remainder Fe and inevitable impurities. The plate is produced by rolling from a slab without the use of accelerated cooling.

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Номер записи: 29
18-10-2012 дата публикации

Hot-rolled steel car or wire rod

Номер: US20120263622A1
Автор: Akira Kito, Takayuki Nakamura, Yoshihiro Daitoh
Принадлежит: Sumitomo Metal Industries Ltd

A hot-rolled steel bar or wire rod consisting of C: 0.1 to 0.3%, Si: 0.05 to 1.5%, Mn: 0.4 to 2.0%, S: 0.003 to 0.05%, Cr: 0.5 to 3.0%, Al: 0.02 to 0.05%, and N: 0.010 to 0.025%, the balance being Fe and impurities, and the impurities containing P: 0.025% or less, Ti: 0.003% or less, and O: 0.002% or less, wherein the structure thereof is composed of a ferrite-pearlite structure, ferrite-pearlite-bainite structure, or ferrite-bainite structure; the standard deviation of ferrite fractions at the time when randomly selected 15 viewing fields of a transverse cross section are observed and measured with the area per one viewing field being 62,500 μm 2 is 0.10 or less; and in a region from the surface to one-fifth of the radius and a region from the center to one-fifth of the radius in the transverse cross section, the amount of Al precipitating as AlN is 0.005% or less, and the density in terms of the number of AlN having a diameter of 100 nm or larger is 5/100 μm 2 or less. In the hot-rolled steel bar or wire rod, even if hot forging is performed in various temperature ranges, austenite grains can be stably prevented from being coarsened at the time of heating for carburization.

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Номер записи: 30
08-11-2012 дата публикации

Austenitic stainless steel pipe excellent in steam oxidation resistance and manufacturing method therefor

Номер: US20120279607A1
Автор: Katsuki Tanaka, Masahiro Seto, Mitsuru Yoshizawa, Yoshitaka Nishiyama
Принадлежит: Sumitomo Metal Industries Ltd

There is provided an austenitic stainless steel pipe excellent in steam oxidation resistance. The austenitic stainless steel pipe excellent in steam oxidation resistance contains, by mass percent, 14 to 28% of Cr and 6 to 30% of Ni, and is configured so that a region satisfying the following Formula exists in a metal structure at a depth of 5 to 20 μm from the inner surface of the steel pipe: (α/β)×δ/ε×100≧0.3 where the meanings of symbols in the above Formula are as follows: α: sum total of the number of pixels of digital image in region in which orientation difference of adjacent crystals detected by electron backscattering pattern is 5 to 50 degrees β: the number of total pixels of digital image in region of measurement using electron backscattering pattern ε: analysis pitch width of electron backscattering pattern (μm) δ: grain boundary width (μm).

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Номер записи: 31
15-11-2012 дата публикации

High-strength spring steel

Номер: US20120285585A1
Автор: Nao Yoshihara, Sayaka Nagamatsu, Tomotada Maruo
Принадлежит: Kobe Steel Ltd

A spring steel contains 0.15-0.40% carbon, 1-3.5% silicon, 0.20-2.0% manganese, 0.05-1.20% chromium, at most 0.030% phosphorus, at most 0.02% sulfur, and at least one of the following: 0.005-0.10% titanium, 0.005-0.05% niobium, and at most 0.25% vanadium. The remainder of said spring steel includes iron and unavoidable impurities. The carbon equivalent (Ceq 1 ) of the provided spring steel, as calculated by formula (1), is at most 0.55. (1) Ceq 1 =[C]+0.108×[Si]−0.067×[Mn]+0.024×[Cr]−0.05×[Ni]+0.074×[V]. In the formula (1), each symbol in brackets represents the content (mass %) of the corresponding element.

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Номер записи: 32
22-11-2012 дата публикации

Drawn heat treated steel wire for high strength spring use and pre-drawn steel wire for high strength spring use

Номер: US20120291927A1
Автор: Masayuki Hashimura, Tetsushi Chida
Принадлежит: Nippon Steel Corp

Drawn heat treated steel wire for high strength spring use is provided containing, by mass %, C: 0.67% to less than 0.9%, Si: 2.0 to 3.5%, Mn: 0.5 to 1.2%, Cr: 1.3 to 2.5%, N: 0.003 to 0.007%, and Al: 0.0005% to 0.003%, having Si and Cr satisfying the following formula: 0.3%≦Si−Cr≦1.2%, and having a balance of iron and unavoidable impurities, having as impurities, P: 0.025% or less and S: 0.025% or less, furthermore having a circle equivalent diameter of undissolved spherical carbides of less than 0.2 μm, further having, as a metal structure, at least residual austenite in a volume rate of over 6% to 15%, having a prior austenite grain size number of #10 or more, and having a circle equivalent diameter of undissolved spherical carbides of less than 0.2 μm.

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Номер записи: 33
29-11-2012 дата публикации

Method for manufacturing grain oriented electrical steel sheets

Номер: US20120298265A1
Автор: Kenichi Sadahiro
Принадлежит: JFE Steel Corp

In a method for manufacturing grain oriented electrical steel sheets from a slab, controlling the steel sheet temperature so as to satisfy T (t)<FDT−(FDT−700)×t/6 (wherein T (t): steel sheet temperature (° C.), FDT: finishing temperature (° C.) and t: time (sec) after the completion of finish rolling) throughout the entire length of a coil during cooling after the completion of finish rolling in hot rolling, and controlling the steel sheet temperature of a tip portion of the coil representing 10% of the length of the coil to be not less than 650° C. at a lapse of 3 seconds from the completion of hot rolling, thus manufacturing a grain oriented electrical steel sheet exhibiting excellent magnetic properties throughout the entire coil length.

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Номер записи: 34
06-12-2012 дата публикации

Non-quenched and tempered steel having ultrafine grained pearlite structure and method of manufacturing the same

Номер: US20120305146A1
Автор: Joong Keun Park, Jun Ho Chung, Sung Hwan Park, Tae Hyung Kim, Young Sang Ko
Принадлежит: Hyundai Motor Co, Kia Motors Corp, Korea Advanced Institute of Science and Technology KAIST

This invention relates to a method of manufacturing non-quenched and tempered steel having an ultrafine grained pearlite structure, including hot forging a steel material so as to be high-temperature compression deformed, thus obtaining a hot forged body; rapidly cooling the hot forged body to a low-temperature pearlite transformation range, thus obtaining a supercooled hot forged body; isothermally holding the supercooled hot forged body in the low-temperature pearlite transformation range so as to be isothermally transformed; and air-cooling the hot forged body; and to non-quenched and tempered steel manufactured thereby.

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Номер записи: 35
13-12-2012 дата публикации

Gas-carburized steel part excellent in surface fatigue strength, steel product for gas carburizing, and manufacturing method of gas-carburized steel part

Номер: US20120312425A1
Автор: Manabu Kubota, Tatsuya Koyama
Принадлежит: Individual

The present invention provides a steel product for gas carburizing used for manufacturing a carburized steel part. In the above steel product for gas carburizing, a composition of a base metal contains, in mass %, C: 0.1 to 0.4%, Si: exceeding 1.2 to 4.0%, Mn: 0.2 to 3.0%, Cr: 0.5 to 5.0%, Al: 0.005 to 0.1%, S: 0.001 to 0.3%, N: 0.003 to 0.03%, and O: limited to 0.0050% or less, and P: limited to 0.025% or less, and when the contents of Si, Mn, and Cr (mass %) are set to [Si %], [Mn %], and [Cr %], Expression (1) below is satisfied, and an alloy shortage layer satisfying Expression (2) below exists in a range from its surface to 2 to 50 μm in depth. 32≧3.5[Si %]+[Mn %]+3[Cr %]>9  (1) 3.5[Si %]+[Mn %]+3[Cr %]≦9  (2)

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Номер записи: 36
13-12-2012 дата публикации

Joining of parts via magnetic heating of metal aluminum powders

Номер: US20120315493A1
Автор: Ian Baker
Принадлежит: Dartmouth College

A method of joining at least two parts includes steps of dispersing a joining material comprising a multi-phase magnetic metal-aluminum powder at an interface between the at least two parts to be joined and applying an alternating magnetic field (AMF). The AMF has a magnetic field strength and frequency suitable for inducing magnetic hysteresis losses in the metal-aluminum powder and is applied for a period that raises temperature of the metal-aluminum powder to an exothermic transformation temperature. At the exothermic transformation temperature, the metal-aluminum powder melts and resolidifies as a metal aluminide solid having a non-magnetic configuration.

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Номер записи: 37
27-12-2012 дата публикации

Seamless steel pipe for high-strength hollow spring

Номер: US20120325364A1
Автор: Hitoshi Hatano, Kotaro Toyotake, Takuya Kochi
Принадлежит: Kobe Steel Ltd

Disclosed is a seamless steel pipe for a high-strength hollow spring, which comprises 0.20 to 0.70 mass % of C, 0.5 to 3.0 mass % of Si, 0.1 to 3.0 mass % of Mn, 0.030 mass % or less (including 0%) of P, 0.030 mass % or less (including 0%) of S, 0.02 mass % or less (including 0%) of N, and the remainder made up by Fe and unavoidable impurities, and which is characterized in that carbide has an equivalent circle diameter of 1.00 μm or less. The seamless steel pipe enables the production of a hollow spring having high strength and excellent durability.

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Номер записи: 38
03-01-2013 дата публикации

Manufacturing method of grain-oriented electrical steel sheet

Номер: US20130000786A1
Автор: Chie Hama, Kazumi Mizukami, Kenichi Murakami, Shuichi Nakamura, Yoshiyuki Ushigami
Принадлежит: Individual

A predetermined steel containing Te: 0.0005 mass % to 0.0050 mass % is heated to 1320° C. or lower to be subjected to hot rolling, and is subjected to annealing, cold rolling, decarburization annealing, and nitridation annealing, and thereby a decarburized nitrided steel sheet is obtained. Further, an annealing separating agent is applied on the surface of the decarburized nitrided steel sheet and finish annealing is performed, and thereby a glass coating film is formed. The N content of the decarburized nitrided steel sheet is set to 0.0150 mass % to 0.0250 mass % and the relationship of 2×[Te]+[N]≦0.0300 mass % is set to be established. Note that [Te] represents the Te content and [N] represents the N content.

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Номер записи: 39
03-01-2013 дата публикации

High-strength hot-rolled steel sheet and method of manufacturing the same

Номер: US20130000791A1
Автор: Junji Haji, Osamu Kawano, Yuzo Takahashi
Принадлежит: Individual

On a cross section with a sheet width direction of a high-strength hot-rolled steel sheet set as a normal line, with regard to an inclusion having a major diameter of 3.0 μm or more, a maximum of a major diameter/minor diameter ratio expressed by (a major diameter of the inclusion)/(a minor diameter of the inclusion) is 8.0 or less, and a sum total of a rolling direction length per 1 mm 2 cross section of a predetermined inclusion group composed of plural inclusions each having a major diameter of 3.0 μm or more and a predetermined extended inclusion having a length in a rolling direction of 30 μm or more is 0.25 mm or less. The plural inclusions composing the predetermined inclusion group congregate in both the rolling direction and a direction perpendicular to the rolling direction 50 μm or less apart from each other. The predetermined extended inclusion is spaced over 50 μm apart from all the inclusions each having a major diameter of 3.0 μm or more in at least either the rolling direction or the direction perpendicular to the rolling direction.

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Номер записи: 40
03-01-2013 дата публикации

Ferritic stainless steel sheet excellent in oxidation resistance and ferritic stainless steel sheet excellent in heat resistance and method of production of same

Номер: US20130004360A1
Автор: Junichi Hamada, Norihiro Kanno, Yoshiharu Inoue
Принадлежит: Individual

Ferritic stainless steel sheet which has a high oxidation resistance and scale spallation resistance even at a high temperature near 1000° C., characterized by containing C: 0.020% or less, N: 0.020% or less, Si: over 0.10 to 0.35%, Mn: 0.10 to 0.60%, Cr: 16.5 to 20.0%, Nb: 0.30 to 0.80%, Mo: over 2.50 to 3.50%, and Cu: 1.00 to 2.50%, having an amount of increase of oxidation after a continuous oxidation test in the air at 1000° C. for 200 hours of 4.0 mg/cm 2 or less, and having an amount of scale spallation of 1.0 mg/cm 2 or less.

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Номер записи: 41
03-01-2013 дата публикации

Ferrite-based stainless steel for use in components of automobile exhaust system

Номер: US20130004361A1
Автор: Nobuhiko Hiraide, Shinichi Teraoka, Shunji Sakamoto
Принадлежит: Individual

This ferritic stainless steel for components of an automobile exhaust system includes, in terms of percent by mass: C: ≦0.015%; Si: 0.01% to 0.50%; Mn: 0.01% to 0.50%; P: ≦0.050%; S: ≦0.010%; N: ≦0.015%; Al: 0.010% to 0.100%; Cr: 16.5% to 22.5%; Ni: 0.5% to 2.0%; and Sn: 0.01% to 0.50%, and further includes either one or both of Ti: 0.03% to 0.30% and Nb: 0.03% to 0.30%, with a remainder being Fe and inevitable impurities.

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Номер записи: 42
10-01-2013 дата публикации

High-strength steel sheet and method for producing same

Номер: US20130008568A1
Автор: Daisuke Maeda, Genichi Shigesato, Kenichi Yamamoto, Naoki Yoshinaga, Satoshi Hirose, Yoshihiro SUWA
Принадлежит: Nippon Steel Corp

A high-strength steel sheet includes, by mass %, C: 0.03% to 0.30%, Si: 0.08% to 2.1%, Mn: 0.5% to 4.0%, P: 0.05% or less, S: 0.0001% to 0.1%, N: 0.01% or less, acid-soluble Al: more than 0.004% and less than or equal to 2.0%, acid-soluble Ti: 0.0001% to 0.20%, at least one selected from Ce and La: 0.001% to 0.04% in total, and a balance of iron and inevitable impurities, in which [Ce], [La], [acid-soluble Al], and [S] satisfy 0.02≦([Ce]+[La])/[acid-soluble Al]<0.25, and 0.4≦([Ce]+[La])/[S]≦50 in a case in which the mass percentages of Ce, La, acid-soluble Al, and S are defined to be [Ce], [La], [acid-soluble Al], and [S], respectively, and a microstructure includes 1% to 50% of martensite in terms of an area ratio.

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Номер записи: 43
24-01-2013 дата публикации

Rare-earth permanent magnetic powder, bonded magnet, and device comprising the same

Номер: US20130020527A1
Автор: Dunbo Yu, HONGWEI Li, Kuoshe LI, Min Wang, Shipeng Li, Yang Luo, Yongqiang YUAN
Принадлежит: Grirem Advanced Materials Co Ltd

A rare-earth permanent magnetic powder, a bonded magnet, and a device comprising the bonded magnet are provided. The rare-earth permanent magnetic powder is mainly composed of 7-12 at % of Sm, 0.1-1.5 at % of M, 10-15 at % of N, 0.1-1.5 at % of Si, and Fe as the balance, wherein M is at least one element selected from the group of Be, Cr, Al, Ti, Ga, Nb, Zr, Ta, Mo, and V, and the main phase of the rare-earth permanent magnetic powder is of TbCu 7 structure. Element Si is added into the rare-earth permanent magnetic powder for increasing the ability of SmFe alloy to from amorphous structure, and for increasing the wettability of the alloy liquid together with the addition of element M in a certain content, which enables the alloy liquid prone to be injected out of a melting device. The average diameter of the rare-earth permanent magnetic powder is in the range of 10-100 μm, and the rare-earth permanent magnetic powder is composed of nanometer crystals with average grain size of 10-120 nm or amorphous structure

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Номер записи: 44
24-01-2013 дата публикации

Electromagnetic machine and system including silicon steel sheets

Номер: US20130022833A1
Автор: Shekhar G. Wakade
Принадлежит: GM GLOBAL TECHNOLOGY OPERATIONS LLC

A silicon steel sheet formed from a silicon steel alloy composition includes, in parts by weight, iron, carbon present in an amount of from about 0.002 to about 0.06, silicon present in an amount of from about 1.5 to about 4.0, aluminum present in an amount of from about 0.1 to 1.0, titanium present in an amount of less than or equal to about 0.03, vanadium present in an amount of less than or equal to about 0.005, and cobalt present in an amount of from about 0.001 to about 5.0 based on 100 parts by weight of the composition. Neither niobium nor zirconium is present in the composition. A silicon steel sheet system including the silicon steel sheet and a coating disposed thereon, and an electromagnetic machine having a magnetic core including a plurality of sheets stacked adjacent one another are also disclosed.

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Номер записи: 45
21-02-2013 дата публикации

High strength stick electrode

Номер: US20130043227A1
Автор: Ashish Kapoor, Craig Dallam, Michael J. Morlock
Принадлежит: Lincoln Global Inc

A shielded metal arc welding electrode for depositing a high strength weld metal bead on a workpiece which satisfies the strength requirements under America Welding Society A5.5 standard's E11018M classification with no chromium added to the composition of the electrode.

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Номер записи: 46
07-03-2013 дата публикации

Automobile chassis part excellent in low cycle fatigue characteristics and method of production of same

Номер: US20130056115A1
Автор: Hideyuki Nakamura, Isao Anai, Takaaki Fukushi
Принадлежит: Individual

An automobile chassis part which is excellent in low cycle fatigue characteristics, characterized by being formed by steel which contains, by mass %, C: 0.02 to 0.10%, Si: 0.05 to 1.0%, Mn: 0.3 to 2.5%, P: 0.03% or less, S: 0.01% or less, Ti: 0.005 to 0.1%, Al: 0.005 to 0.1%, N: 0.0005 to 0.006%, and B: 0.0001 to 0.01 and has a balance of Fe and unavoidable impurities, in which 80% or more of the part structure comprises a bainite structure and in which a portion where a ratio R/t of the thickness “t” and external surface curvature radius R is 5 or less has an X-ray half width of an (211) plane of 5 (deg) or less.

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Номер записи: 47
14-03-2013 дата публикации

HIGH STRENGTH HOT-ROLLED STEEL SHEET HAVING EXCELLENT STRETCH FLANGEABILITY AND FATIGUE RESISTANCE AND METHOD FOR MANUFACTURING THE SAME

Номер: US20130061989A1
Автор: Funakawa Yoshimasa, Moriyasu Noriaki, Murata Takayuki, Nakajima Katsumi, Nakamura Nobuyuki, Saito Hayato
Принадлежит: JFE STEEL CORPORATION

A high strength hot-rolled steel sheet has a tensile strength of not less than 780 MPa and exhibits excellent stretch flangeability and excellent fatigue resistance. A steel has a composition containing C at 0.05 to 0.15%, Si at 0.2 to 1.2%, Mn at 1.0 to 2.0%, P at not more than 0.04%, S at not more than 0.005%, Ti at 0.05 to 0.15%, Al at 0.005 to 0.10% and N at not more than 0.007%. 1. A high strength hot-rolled steel sheet with excellent stretch flangeability and fatigue resistance which has a composition comprising , in terms of mass % ,C at 0.05 to 0.15%, Si at 0.2 to 1.2%,Mn at 1.0 to 2.0%, P at not more than 0.04%,S at not more than 0.005%, Ti at 0.05 to 0.15%,Al at 0.005 to 0.10% and N at not more than 0.007%,wherein content of dissolved Ti is not less than 0.02%, the balance being represented by Fe and inevitable impurities, and comprises a bainite single phase microstructure having an average grain diameter of not more than 5 μm.2. The high strength hot-rolled steel sheet according to claim 1 , wherein the average grain diameter is more than 3.0 to 5 μm.3. The high strength hot-rolled steel sheet according to claim 1 , wherein the steel sheet has a microstructure comprising a bainite phase at an area ratio of not less than 90% relative to the entirety of the microstructure and a second phase other than the bainite phase and in which the average grain diameter of the bainite phase is not more than 5 μm and the average grain diameter of the second phase is not more than 3 μm.4. The high strength hot-rolled steel sheet according to claim 3 , wherein the average grain diameter of the bainite phase is more than 3.0 to 5 μm.5. The high strength hot-rolled steel sheet according to claim 1 , wherein the composition further comprises claim 1 , in terms of mass % claim 1 , Sb at 0.001 to 0.020%.6. The high strength hot-rolled steel sheet according to claim 1 , wherein the composition further comprises claim 1 , in terms of mass % claim 1 , one claim 1 , or two or ...

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Номер записи: 48
21-03-2013 дата публикации

Method and apparatus for heating a metal plate

Номер: US20130068756A1
Автор: BOREK Dvorak, Jochen Doerr, Jochen Grewe, Radovan Kout
Принадлежит: Benteler Automobiltechnik GmbH

In a method for heating a metal plate, the metal plate is placed between an lower contact element and an upper contact element. The contact elements are provided with heating units and integrated in mounts. At least one of the contact elements is shaped to suit a contour of the metal plate and made of a heat conducting material with a conductivity of at least 150 W/mK. The metal plate is heated between the contact elements to a temperature of 200° C. to 450° C. for a time period of less than 120 s in the presence of a contact pressure.

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Номер записи: 49
21-03-2013 дата публикации

ELECTRODE FOR ELECTRIC-DISCHARGE SURFACE TREATMENT AND ELECTRIC-DISCHARGE SURFACE TREATMENT COATING

Номер: US20130069015A1
Автор: Goto Akihiro, Nakano Yoshikazu, Sumi Nobuyuki, Teramoto Hiroyuki
Принадлежит: Mitsubishi Electric Corporation

In order to establish an electric-discharge surface treatment capable of forming a smooth high-hardness coating, in the electric-discharge surface treatment in which pulsed electric discharge is generated between the electrode and a base material in a machining fluid or in the air by using a green compact, which is formed by compressing powder of an electrode material, as an electrode, and by using energy of the electric discharge, a coating including the electrode material or a reaction product of the electrode material reacted by the electric discharge energy is formed on a surface of the base material, wherein, as the powder of the electrode material, a mixed powder formed by mixing 10 to 75 vol % of Si powder to powder of a hard material is used. 1. An electrode for electric-discharge surface treatment , which is used in an electric-discharge surface treatment in which pulsed electric discharge is generated between the electrode and a base material in a machining fluid or in the air by using a green compact , which is formed by compressing powder of an electrode material , as the electrode , and by using energy of the electric discharge , a coating including the electrode material or a reaction product of the electrode material reacted by the electric discharge energy is formed on a surface of the base material ,wherein, as the powder of the electrode material, a mixed powder formed by mixing 10 to 75 vol % of Si powder to powder of a hard material is used.2. The electrode for electric-discharge surface treatment according to claim 1 ,{'sub': 3', '2', '2', '3, 'wherein, as the powder of the hard material, TiC, a metal such as W or Mo, a ceramic such as WC, CrC, MoC, SiC or TaC, a nitride such as TiN or SiN, or an oxide such as AlOis used.'}3. An electrode for electric-discharge surface treatment claim 1 , which is used in an electric-discharge surface treatment in which pulsed electric discharge is generated between the electrode and a base material in a ...

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Номер записи: 50
28-03-2013 дата публикации

Steel Product with Improved Weathering Characteristics in Saline Environment

Номер: US20130078135A1
Автор: Alexandra Julieth, Antonissen Joachim, De Grave Eddy
Принадлежит:

The present invention is related to a steel product of the weathering steel type, i.e. a product exhibiting increased corrosion resistance after having been exposed to the outside environment for a given time. According to the invention, the steel product is defined by a composition consisting of (in wt %):—Carbon between 0.03 and 0.2,—Manganese between 0.5 and 2,—Copper between 0 and 0.5,—Ti between 0 and 0.1,—Cr between 0 and 0.5,—Nickel between 0 and 0.2,—Niobium between 0 and 0.1,—Nitrogen between 0 and 0.01,—Sulphur between 0 and 0.01, Phosphor between 0 and 0.01,—Aluminium higher than 0 and maximum 1.5,—Silicon between 0.25 and 1.5, the balance being Fe and accidental impurities, and wherein the sum of the Al and Si levels is higher than about 0.85 wt %. 14-. (canceled)6. The steel product according to claim 5 , comprising no Sn and no Sb.7. A steel product according to claim 5 , said product being a sheet or beam.8. A steel product according to claim 6 , said product being a sheet or beam.9. Use of a steel product according to as a product that exhibits an increase in corrosion resistance when exposed to a chlorine-rich environment.10. Use of a product according to claim 6 , in saline outdoor conditions. The present invention is related to steel types and products made thereof, which exhibit an increase in corrosion resistance when exposed to a chlorine-rich environment. These steels are known as weathering steels.Weathering steels have been studied and documented for some time. The corrosion resistance is caused by a layer of rust that forms on the steel surface when it is exposed to the outside environment. Traditional alloying elements which enhance this type of weathering resistance are Cu, P, Cr and Ni. However, traditional weathering steels haven proven to be ineffective in an environment containing Cl ions, i.e. marine or seaside environments. It was observed that the Cl ions destabilize some of the stable components that form the protective oxide ...

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Номер записи: 51
04-04-2013 дата публикации

Iron-based sintered sliding member and production method therefor

Номер: US20130084203A1
Автор: Daisuke Fukae, Hideaki Kawata, Hidekazu Tokushima
Принадлежит: Hitachi Powdered Metals Co Ltd

An iron-based sintered sliding member consists of, by mass %, 0.1 to 10% of Cu, 0.2 to 2.0% of C, 0.03 to 0.9% of Mn, 0.52 to 6.54% of S, and the balance of Fe and inevitable impurities. The iron-based sintered sliding member satisfies the following First Formula in which [S %] represents mass % of S and [Mn %] represents mass % of Mn in the overall composition. The iron-based sintered sliding member exhibits a metallic structure in which pores and sulfide particles are dispersed in the matrix that includes a martensite structure at not less than 50% by area ratio in cross section. The sulfide particles are dispersed at 3 to 30 vol. % with respect to the matrix. [S %]=0.6×[Mn %]+0.5 to 6.0  First Formula

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Номер записи: 52
11-04-2013 дата публикации

HIGH-STRENGTH HOT-ROLLED STEEL SHEET HAVING EXCELLENT FORMABILITY AND METHOD FOR MANUFACTURING THE SAME

Номер: US20130087252A1
Автор: Ariga Tamako, Funakawa Yoshimasa, Moriyasu Noriaki, Murata Takayuki, Nakajima Katsumi
Принадлежит: JFE STEEL CORPORATION

A high-strength hot-rolled steel sheet has a composition including C: 0.005% or more and 0.050% or less, Si: 0.2% or less, Mn: 0.8% or less, P: 0.025% or less, S: 0.01% or less, N: 0.01% or less, Al: 0.06% or less, and Ti: 0.05% or more and 0.10% or less, on a mass percent basis, such that S, N, and Ti satisfy Ti≧0.04+(N/14×48+S/32×48), the remainder being Fe and incidental impurities; a matrix in which a ferrite phase constitutes 95% by area or more of the entire structure; and a structure in which Ti-containing fine carbide having an average grain size of less than 10 nm is dispersedly precipitated, and the volume ratio of the fine carbide to the entire structure is 0.0007 or more. 1. A high-strength hot-rolled steel sheet having excellent formability , comprising: C: 0.005% or more and 0.050% or less, Si: 0.2% or less,', 'Mn: 0.8% or less, P: 0.025% or less,', 'S: 0.01% or less, N: 0.01% or less,', {'br': None, 'Ti≧0.04+(N/14×48+S/32×48)\u2003\u2003(1)'}, 'Al: 0.06% or less, and Ti: 0.05% or more and 0.10% or less, on a mass percent basis, such that S, N, and Ti satisfy Formula (1), the remainder being Fe and incidental impurities; a matrix in which a ferrite phase constitutes 95% by area or more of the entire structure; and a structure in which Ti-containing fine carbide having an average grain size of less than 10 nm is dispersedly precipitated, and volume ratio of the fine carbide to the entire structure is 0.0007 or more, wherein the high-strength hot-rolled steel sheet has a tensile strength of 590 MPa or more], 'a composition comprising'}wherein S, N, and Ti denote their respective contents (% by mass).5. The steel sheet according to claim 1 , further comprising at least one of Cu claim 1 , Sn claim 1 , Ni claim 1 , Ca claim 1 , Mg claim 1 , Co claim 1 , As claim 1 , Cr claim 1 , W claim 1 , Nb claim 1 , Pb claim 1 , and Ta claim 1 , which in total constitutes 0.1% or less of the composition on a mass percent basis.6. The steel sheet according to claim 1 , ...

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Номер записи: 53
11-04-2013 дата публикации

High strength steel sheet and method for manufacturing the same

Номер: US20130087253A1
Автор: Hiroshi Matsuda, Yasushi Tanaka, Yoshimasa Funakawa
Принадлежит: JFE Steel Corp

A high strength steel sheet has tensile strength of at least 1470 MPa and (tensile strength×total elongation) of at least 29000 MPa·% with a composition including, by mass %, C: 0.30% to 0.73%, Si: 3.0% or less, Al: 3.0% or less, Si+Al: at least 0.7%, Cr: 0.2% to 8.0%, Mn: 10.0% or less, Cr+Mn: at least 1.0%, P: 0.1% or less, S: 0.07% or less, N: 0.010% or less, and remainder as Fe and incidental impurities; and processing the steel sheet such that microstructure satisfies area ratio of martensite with respect to the microstructure of 15% to 90%; content of retained austenite of 10% to 50%; at least 50% of the martensite is constituted of tempered martensite and area ratio of the tempered martensite with respect to the microstructure is at least 10%; and area ratio of polygonal ferrite with respect to the microstructure is 10% or less.

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Номер записи: 54
11-04-2013 дата публикации

HIGH STRENGTH HOT-ROLLED STEEL SHEET HAVING EXCELLENT STRETCH-FLANGE FORMABILITY AND METHOD FOR MANUFACTURING THE SAME

Номер: US20130087254A1
Автор: Ariga Tamako, Funakawa Yoshimasa, Moriyasu Noriaki, Murata Takayuki
Принадлежит: JFE STEEL CORPORATION

A high strength hot-rolled steel sheet has a composition containing more than 0.035% to 0.055% C, 0.2% or less Si, 0.35% or less Mn, 0.03% or less P, 0.03% or less S, 0.1% or less Al, 0.01% or less N, 0.08% to 0.25% Ti, and 0.0005% to 0.0035% B on a mass basis, solute B being 0.0005% or more, the remainder being Fe and unavoidable impurities; a matrix containing a ferrite phase having an area fraction of more than 95%; a microstructure in which Ti carbides having an average grain size of less than 10 nm are finely precipitated in grains of the ferrite phase and the volume fraction of the Ti carbides is 0.0015 to 0.007; and a tensile strength of 780 MPa or more. 1. A high strength hot-rolled steel sheet with excellent stretch-flange formability , having a composition comprising more than 0.035% to 0.055% C , 0.2% or less Si , 0.35% or less Mn 0.03% or less P , 0.03% or less s , 0.1% or less Al , 0.01% or less N , 0.08% to 0.25% Ti , and 0.0005% to 0.0035% B on a mass basis , solute B being 0.0005% or more , the remainder being Fe and unavoidable impurities; a matrix containing a ferrite phase having an area fraction of more than 95%; a microstructure in which Ti carbides having an average grain size of less than 10 nm are finely precipitated in grains of the ferrite phase and volume fraction of the Ti carbides is 0.0015 to 0.007; and a tensile strength of 780 MPa or more.2. The high strength hot-rolled steel sheet according to claim 1 , further comprising a plating layer on a surface of a steel sheet.3. The high strength hot-rolled steel sheet according to claim 1 , further comprising claim 1 , in total claim 1 , 1.0% or less of one or more of REMs claim 1 , Zr claim 1 , Nb claim 1 , V claim 1 , As claim 1 , Cu claim 1 , Ni claim 1 , Sn claim 1 , Pb claim 1 , Ta claim 1 , W claim 1 , Mo claim 1 , Cr claim 1 , Sb claim 1 , Mg claim 1 , Ca claim 1 , Co claim 1 , Sc claim 1 , Zn claim 1 , and Cs on a mass basis in addition to the composition.4. A method of manufacturing ...

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Номер записи: 55
11-04-2013 дата публикации

STEEL WIRE WITH HIGH STRENGTH FOR COLD FORGING TO IMPROVE SERVICE LIFE OF MOLD AND METHOD OF MANUFACTURING THE SAME

Номер: US20130087256A1
Автор: Ahn Soon-Tae
Принадлежит: SAMHWA STEEL CO., LTD.

The present invention relates to a pre-heat treatment steel wire with high strength for a cold forging which is used as a material for an engine, chassy and parts (bolts and shafts) of a steering device. The method includes: cold drawing of a wire rod containing 0.15-0.40 wt % of C, less than 1.5 wt % of Si, 0.30-2.0 wt % of Mn, less than 0.03 wt % of P, less than 0.03 wt % of S and the remainder including Fe and unavoidable impurities; rapidly heating the cold drawn wire rod in a series of high frequency induction heating devices over Ac3 transformation point for 30-90 seconds and maintaining such a heated state; rapidly cooling the wire rod in the heated state by water or oil; executing a tempering process by heating the wire rod to 500° C.-A1 transformation point for 30-90 seconds including a holding time at such a temperature; cooling the heated wire rod by water to achieve a wire rod with a tensile strength of 1,100-1,400 MPa; and cold drawing the wire rod at an area reduction rate of 25-40% to yield a tensile strength of 1,200-1,600 MPa. Although the inventive steel wire has a tensile strength more than 1,200 MPa, it is possible to execute cold forging and bring about a remarkable improvement of the service life of a mold. 1. A high strength steel wire with an improved service life of a mold for cold forging , comprising 0.15-0.40 wt % of C , less than 1.5 wt % of Si , 0.30-2.0 wt % of Mn , less than 0.03 wt % of P , less than 0.03 wt % of S , and the remainder including Fe and unavoidable impurities ,wherein the steel wire is cold drawn, in turn executed by quenching and tempering, and then drawn at an area reduction rate of 25-40% to yield a tensile strength of 1,200-1,600 MPa.2. The steel wire as recited in claim 1 , further comprising at least one or more components among 0.05-2.0 wt % of Cr claim 1 , 0.05-1.5 wt % of Mo claim 1 , 0.01-0.10 wt % of Ti claim 1 , 0.0003-0.0050 wt % of B claim 1 , and 0.01-0.05 wt % of Al.3. A method of manufacturing a high ...

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Номер записи: 56
11-04-2013 дата публикации

ULTRA HIGH STRENGTH COLD ROLLED STEEL SHEET HAVING EXCELLENT DUCTILITY AND DELAYED FRACTURE RESISTANCE AND METHOD FOR MANUFACTURING THE SAME

Номер: US20130087257A1
Автор: Hasegawa Kohei, Yoshino Masataka
Принадлежит: JFE STEEL CORPORATION

An ultra.-high-strength cold-rolled steel sheet with excellent ductility and delayed fracture resistance includes 0.15% to 0.75 C. 1.0% to 3.0% Si, 1.5% to 2.5% Mn, 0.05% or less P, 0.02% or less 5, 0.01% to 0.05% Al, and less than 0.005% N on a mass ratio, the remainder being Fe and =avoidable impurities, the ultra-high-strength cold-rolled steel sheet having a metal microstructure including 40% to 85% of a tempered martensite phase and 15% to 60% of a ferrite phase on a volume fraction basis and a tensile strength of 1320 Mtn or more. 1. An ultra-high-strength cold-rolled steel sheet with excellent ductility and delayed fracture resistance , comprising 0.15% to 0.25% C , 1.0% to 3.0% Si , 1.5% to 2.5% Mn , 0.05% or less P , 0.02% or less S , 0.01% to 0.05% Al , and less than 0.005% N on a mass ratio , the remainder being Fe and unavoidable impurities , the ultra-high-strength cold-rolled steel sheet having a microstructure comprising 40% to 85% of a tempered martensite phase and 15% to 60% of a ferrite phase on a volume fraction basis and a tensile strength of 1320 MPa or more.2. The cold-rolled steel sheet according to claim 1 , further comprising one or more of 0.1% or less Nb claim 1 , 0.1% or less Ti claim 1 , and 5 ppm to 30 ppm B on a mass ratio.3. The cold-rolled steel sheet according to claim 1 , having a total elongation of 12% or more.4. A method for manufacturing an ulta-high-strengh cold-rolled steel sheet having excellent ductility and delayed fracture resistance claim 1 , comprising;{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'heating a steel slab having the chemical composition specified in to 1200° C. or higher;'}hot-rolling the steel slab at a finish rolling end temperature of 800° C. or higher;pickling the steel;cold-rolling the steel;{'sub': 1', '3, 'continuously annealing the steel such that the steel is held at a temperature ranging from the Actransformation temperature to Actransformation temperature thereof for 30 a to 1200 s, cooled ...

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Номер записи: 57
18-04-2013 дата публикации

Martensitic antibacterial stainless steel and manufacturing method thereof

Номер: US20130092296A1
Автор: Dexin Qui
Принадлежит: Individual

This invention relates to antimicrobial martensitic stainless steels with nano precipitation and their manufacturing method of melting, forging, heat treatment. As the nano ε-Cu phases are precipitated in the matrix dispersedly, the martensitic stainless steels have excellent antimicrobial properties. The martensitic stainless steels may comprise from 0.35 to 1.20 weight percent C, from 12.00 to 26.90 weight percent Cr, from 0.29 to 4.60 weight percent Cu, 0.27 weight percent as less Ag, from 0.15 to 4.60 weight percent W, from 0.27 to 2.80 weight percent Ni, from 0.01 to 1.125 weight percent Nb, from 0.01 to 1.35 weight percent V, 1.8 percent or less Mn, from 0.15 to 4.90 weight percent Mo, 2.6 weight percent or less Si, 3.6 weight percent or less RE (rare earth) and the balance Fe and incidental impurities.

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Номер записи: 58
18-04-2013 дата публикации

Method for inhibiting corrosion under insulation on the exterior of a structure

Номер: US20130095313A1
Автор: Brian Joseph Fitzgerald, James Edward Feather, Shiun Ling
Принадлежит: ExxonMobil Research and Engineering Co

A method for inhibiting corrosion under insulation (CUI) on the exterior of a structure, e.g., pipelines, piping, vessels and tanks, is provided. The method involves providing a structure that is at least partially formed from a corrosion resistant carbon steel (CRCS) composition. The CRCS composition includes corrosion resistance alloying additions in the amount of 0.1 weight percent to 9 weight percent. At least one alloying addition has a low free energy of formation for its oxide and/or hydroxide, e.g., vanadium and/or titanium. A corrosion inhibited structure that includes a structure at least partially formed from a corrosion resistant carbon steel (CRCS) composition, and insulation positioned around at least a portion of the structure.

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Номер записи: 59
25-04-2013 дата публикации

ULTRA-HIGH-STRENGTH STEEL BAR AND METHOD FOR MANUFACTURING SAME

Номер: US20130098513A1
Автор: Kwon Yeong-Jun, Lee Hyoung-Chul, LEE Sang-Youn
Принадлежит: HYUNDAI STEEL COMPANY

This invention relates to an ultra-high-strength steel bar and to a method of manufacturing the same, in which the steel bar includes C: 0.05 to 0.45 wt %, Si: 0.10 to 0.35 wt %, Mn: 0.1 to 0.85 wt %, Cr: 0.6 to 1.20 wt %, and Mo: 0.05 to 0.35 wt %, with the remainder being Fe, wherein a martensite structure is formed at a surface layer and a fine ferrite structure is formed at a center layer. 1. An ultra-high-strength steel bar , comprising:C: 0.05 to 0.45 wt %, Si: 0.10 to 0.35 wt %, Mn: 0.1 to 0.85 wt %, Cr: 0.6 to 1.20 wt %, and Mo: 0.05 to 0.35 wt %, with a remainder being Fe and other impurities, and including a surface layer and a center layer,wherein a martensite structure which is a hardening layer is formed at the surface layer and the center layer includes a ferrite structure.2. The ultra-high-strength steel bar of claim 1 , wherein the other impurities comprise P: 0.035 wt % or less but exceeding zero claim 1 , Ni: 0.2 wt % or less but exceeding zero claim 1 , Cu: 0.3 wt % or less but exceeding zero claim 1 , V: 0.001 to 0.006 wt % claim 1 , S: 0.075 wt % or less but exceeding zero claim 1 , Al: 0.04 wt % or less but exceeding zero claim 1 , Sn: 0.01 wt % or less but exceeding zero claim 1 , and N: 150 ppm or less but exceeding zero.3. The ultra-high-strength steel bar of claim 1 , wherein the steel bar has a diameter of 9.5˜10.5 mm.4. The ultra-high-strength steel bar of claim 1 , wherein the ferrite structure has a grain size of 5˜7 μm.5. The ultra-high-strength steel bar of claim 1 , wherein the hardening layer has a depth of 0.8˜2.3 mm from a surface toward a center.6. A method of manufacturing an ultra-high-strength steel bar claim 1 , comprising:subjecting a billet for a steel bar comprising C: 0.05 to 0.45 wt %, Si: 0.10 to 0.35 wt %, Mn: 0.1 to 0.85 wt %, Cr: 0.6 to 1.20 wt %, and Mo: 0.05 to 0.35 wt %, with a remainder being Fe and other impurities, to a hot rolling process in which reheating and rough milling are performed twice and then ...

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Номер записи: 60
25-04-2013 дата публикации

STEEL FOR MACHINE STRUCTURE EXHIBITING EXCELLENT MACHINABILITY

Номер: US20130101457A1
Автор: Aiso Toshiharu, Kozawa Shuji, Kubota Manabu, Miyanishi Kei, Yoshida Suguru
Принадлежит: NIPPON STEEL & SUMITOMO METAL CORPORATION

This steel for a machine structure contains, in mass %: C: 0.40% to less than 0.75%; Si: 0.01% to 3.0%; Mn: 0.1% to 1.8%; S: 0.001% to 0.1%; Al: more than 0.1% and not more than 1.0%; N: 0.001% to 0.02%; and P: limited to not more than 0.05%, with a balance including Fe and inevitable impurities, in which the steel satisfies 139.38 ≦214×[C]+30.6×[Si]+42.8×[Mn]−14.7×[Al]≦177 and 0.72≦[C]+1/7×[Si]+1/5×[Mn]<1.539. 1. A steel for a machine structure , the steel comprising , in mass %:C: 0.40% to less than 0.75%;Si: 0.01% to 3.0%;Mn: 0.1% to 1.8%;S: 0.001% to 0.1%;Al: more than 0.1% and not more than 1.0%;N: 0.001% to 0.02%; andP: limited to not more than 0.05%,with a balance including Fe and inevitable impurities, wherein [{'br': None, '139.38≦214×[C]+30.6×[Si]+42.8×[Mn]−14.7×[al]≦177\u2003\u2003(1)'}, {'br': None, '0.72≦[C]+1/7×[Si]+1/5×[Mn]<1.539\u2003\u2003(2)'}], 'an amount of C: [C], an amount of Si: [Si], an amount of Mn: [Mn], and an amount of Al: [Al] satisfy following Expression (1) and Expression (2).'}2. The steel for a machine structure according to claim 1 , wherein the steel further satisfies following Expression (3).{'br': None, '113−135×[C]−27×[Mn]≦13\u2003\u2003(3)'}3. The steel for a machine structure according to claim 1 , wherein the steel further satisfies following Expression (4).{'br': None, '55≦33+31×[C]+4.5×[Si]+1.5×[Mn]<72.45\u2003\u2003(4)'}4. The steel for a machine structure according to claim 2 , wherein the steel further satisfies following Expression (4).{'br': None, '55≦33+31×[C]+4.5×[Si]+1.5×[Mn]<72.45\u2003\u2003(4)'}5. The steel for a machine structure according to claim 1 , wherein {'br': None, '1.5<[Si]+1.8×[Mn]<6.24\u2003\u2003(5)'}, 'the steel further satisfies following Expression (5).'}6. The steel for a machine structure according to claim 1 , whereinthe steel further comprises B: 0.0001% to 0.015% in mass %.7. The steel for a machine structure according to claim 1 , whereinthe steel further comprises, in mass %, one or more ...

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Номер записи: 61
09-05-2013 дата публикации

Grain oriented electrical steel sheet and method for manufacturing the same

Номер: US20130112319A1
Автор: Hiroaki Toda, Hiroi Yamaguchi, Seiji Okabe, Takeshi Omura
Принадлежит: JFE Steel Corp

A grain oriented electrical steel sheet is subjected to magnetic domain refinement by laser irradiation and has magnetic flux density B 8 of at least 1.91 T, wherein the nitrogen content in the forsterite coating is 3.0 mass % or less. The grain oriented electrical steel sheet satisfies recent demand for iron loss reduction.

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Номер записи: 62
16-05-2013 дата публикации

METHOD OF PRODUCING AN AUSTENITIC STEEL

Номер: US20130118647A1
Автор: Berkhout Basjan, Cornelissen Marcus Cornelis Maria, Patel Jayesh Ramjibhai
Принадлежит: TATA STEEL IJMUIDEN BV

A method of producing an austenitic steel strip or sheet excellent in resistance to delayed cracking and a steel produced thereby. 2. Process according to claim 1 , wherein the aluminium content of the work piece is at least 1.25 and/or at most 3.5%.3. Process according to claim 1 , wherein during the cooling at a cooling rate Vafter the continuous annealing the strip or sheet is led through a hot dip bath for providing a metallic coating by hot dipping the strip or sheet into a molten bath of the metal making up the metallic coating.4. Process according to claim 1 , wherein the strip or sheet is pickled after continuous annealing and wherein the strip or sheet is provided with a metallic coating by pickling after annealing followed by heating to a temperature below the continuous annealing temperature before the strip or sheet is led through a hot dip bath for providing a metallic coating by hot dipping the strip or sheet into a molten bath of the metal making up the metallic coating.5. Process according to claim 1 , wherein reduction of the cold-rolling is between 10 to 90%.6. Process according to claim 1 , wherein the annealed strip or sheet is temper rolled with a reduction of from 0.5 to 10% prior to or after the metallic coating has been provided to the strip or sheet.7. Process according to claim 1 , wherein the Vanadium content is between 0.06 and 0.22%.8. Process according to claim 1 , wherein the cooling rate Vis between 20 and 80° C./s.9. Process according to claim 1 , wherein the strip or sheet is pickled after continuous annealing and wherein the strip or sheet is provided with a metallic coating claim 1 , by pickling after continuous annealing followed by heating to a temperature between 400 and 600° C. before the strip or sheet is led through a hot dip bath for providing a metallic coating by hot dipping the strip or sheet into a molten bath of the metal making up the metallic coating.10. Process according to claim 9 , wherein the Fe in the strip or ...

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Номер записи: 63
16-05-2013 дата публикации

Spring and manufacture method thereof

Номер: US20130118655A1
Автор: Kosuke Shibairi, Shimpei Kurokawa, Takeshi Suzuki, Yoshiki Ono
Принадлежит: NHK Spring Co Ltd

A spring consists of, by mass %, 0.5 to 0.7% of C, 1.0 to 2.0% of Si, 0.1 to 1.0% of Mn, 0.1 to 1.0% of Cr, not more than 0.035% of P, not more than 0.035% of S, and the balance of Fe and inevitable impurities. The spring has a structure including not less than 65% of bainite and 4 to 13% of residual austenite by area ratio in a cross section. The spring has a compressive residual stress layer in a cross section from a surface to a depth of 0.35 mm to D/4, in which D (mm) is a circle-equivalent diameter of the cross section. The spring has a high hardness layer with greater hardness than a center portion by 50 to 500 HV from a surface to a depth of 0.05 to 0.3 mm.

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Номер записи: 64
16-05-2013 дата публикации

FERRITIC STAINLESS STEEL, WITH HIGH AND STABLE GRAIN REFINING POTENCY, AND ITS PRODUCTION METHOD

Номер: US20130121870A1
Автор: Janis Jesper, Jönsson Pär, JONSSON Stefan, Karasev Andrey, Nakajima Keiji
Принадлежит:

A ferritic stainless steel comprising Cr: max 24 mass %, Ti: 200 to 1000 mass ppm, Zr: at least 200 mass ppm, whereby the Zr/Ti ratio is greater than 0.3, O: 10 to 150 mass ppm, N: at least 70 mass ppm, whereby the N/O ratio is greater than 1.5, C: max. 0.03 mass %, and balance Fe and residual elements. 1. A ferritic stainless steel , wherein it comprisesCr: max 24 mass %,Ti: 200 to 1000 mass ppm,Zr: at least 200 mass ppm,whereby the Zr/Ti ratio is greater than 0.3,O: 10 to 150 mass ppm,N: at least 70 mass ppmwhereby the N/O ratio is greater than 1.5,C: max. 0.03 mass %, andbalance Fe and residual elements.2. A ferritic stainless steel according to claim 1 , wherein it comprises Ti and/or Zr oxides/nitrides with a maximum diameter of 5 μm.3. A ferritic stainless steel according to claim 1 , wherein it comprises a total number of more than 1×10Ti and/or Zr oxides/nitrides per mmof the steel.4. A method for producing of a ferritic stainless steel according to claim 1 , wherein the method comprises the step of adding deoxidizers Si claim 1 , Mn claim 1 , Ti and Zr to a melt in the order of weak deoxidizer to strong deoxidizer claim 1 , i.e. firstly Si and Mn claim 1 , then Ti claim 1 , and finally Zr.5. A method according to claim 4 , wherein the method comprises the step of deoxidizing a melt with said deoxidizers in said order with an interval of 1 to 5 minutes between additions claim 4 , holding the melt for at least one minute and casting the melt. The present invention relates to a ferritic stainless steel, with high and stable grain refining potency and its production method.In general, steel quality is greatly improved by removing impurities and large inclusions which may adversely affect the properties of the steel. In the production of carbon steels, the fine oxide dispersion technique by the addition of Zr—Mg, Ti—Zr, Ti—Mg or Ti—Mg—Ca is well known as “Oxide Metallurgy”. This technique makes it possible to control the grain size using fine oxide particles, ...

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Номер записи: 65
16-05-2013 дата публикации

Martensitic Stainless Steel and Production Method Therefor

Номер: US20130122320A1
Автор: Chae Dong-Chul, Jo Ki-Hoon, Kwon Joon-In, Park Mi-Nam, Seok Jong-Heon, Song Byoung-Jun
Принадлежит: POSCO

A martensitic stainless steel for use in tableware, knives, scissors and the like, containing in % by weight, 0.10 to 0.50% carbon and 11 to 16% chromium, and a production method therefore. A production method for mid-carbon martensitic stainless steel in a strip-casting device comprising a pair of rolls rotating in opposite directions, edge dams respectively provided to both sides of the rolls so as to form a molten steel pool, and a meniscus shield for supplying inert nitrogen gas to the upper surface of the molten steel pool, wherein a stainless-steel thin sheet is produced by supplying a molten stainless steel of the above composition to the molten steel pool via a nozzle from a tundish, and a hot-rolled annealed strip is produced to a rolling reduction of 5 to 40% using in-line rollers, and relates to martensitic stainless steel produced by the production method 1. A production method for a martensitic stainless steel , wherein , in a strip-casting device comprising a pair of rolls rotating in opposite directions , edge dams respectively provided to both sides of the rolls so as to form a molten steel pool , and a meniscus shield for supplying inert nitrogen gas to the upper surface of the molten steel pool , a stainless-steel thin sheet is produced by supplying a molten stainless steel containing , as percentages by weight , 1.10 to 0.50% carbon and 11 to 16% chromium , to the molten steel pool via a nozzle from a tundish , and a hot-rolled annealed strip is produced to a rolling reduction of 5 to 40% using in-line rollers.2. The production method of claim 1 , wherein the martensitic stainless steel contains claim 1 , as percentages by weight claim 1 , 0.1 to 1.0% silicon (Si) claim 1 , 0.1 to 1.0% manganese (Mn) claim 1 , over 0 to 0.1% nickel (Ni) claim 1 , over 0 to 0.04 sulfur (S) claim 1 , and over 0 to 0.05 phosphorus (P) claim 1 , and Fe and other unavoidable impurities as remnants.3. The production method of claim 1 , wherein a hot-rolled annealed ...

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Номер записи: 66
23-05-2013 дата публикации

Manufacturing method of non-oriented electrical steel sheet

Номер: US20130125601A1
Автор: Masahiro Fujikura, Takeshi Kubota
Принадлежит: Nippon Steel and Sumitomo Metal Corp

A steel having a predetermined composition is hot-rolled so as to form a steel strip, the steel strip is subjected to first cold-rolling, the steel strip is subjected to intermediate annealing, the steel strip is subjected to second cold-rolling, and the steel strip is subjected to finish annealing. A finish temperature in the hot-rolling is 900° C. or less, annealing is not performed between the hot-rolling and the first cold-rolling, and a rolling reduction in the second cold-rolling is not less than 40% nor more than 85%.

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Номер записи: 67
23-05-2013 дата публикации

Structural stainless steel sheet having excellent corrosion resistance at weld and method for manufacturing same

Номер: US20130126052A1
Автор: Hiroki Ota, Kenichi Fujita, Yasushi Kato
Принадлежит: JFE Steel Corp

A structural stainless steel sheet which can be manufactured at a low cost and with high efficiency, and possesses excellent welded-part corrosion resistance and a manufacturing method thereof are provided. The structural stainless steel sheet has a composition which contains by mass % 0.01 to 0.03% C, 0.01 to 0.03% N, 0.10 to 0.40% Si, 1.5 to 2.5% Mn, 0.04% or less P, 0.02% or less S, 0.05 to 0.15% Al, 10 to 13% Cr, 0.5 to 1.0% Ni, 4×(C+N) or more and 0.3% or less Ti, and Fe and unavoidable impurities as a balance, V, Ca and O in the unavoidable impurities being regulated to 0.05% or less V, 0.0030% or less Ca and 0.0080% or less O, wherein an F value expressed by Cr+2×Si+4×Ti−2×Ni−Mn−30×(C+N) satisfies a condition that F value≦11 and an FFV value expressed by Cr+3×Si+16×Ti+Mo+2×Al−2×Mn−4×(Ni+Cu)−40×(C+N)+20×V satisfies a condition that FFV value≦9.0.

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Номер записи: 68
23-05-2013 дата публикации

Ferritic stainless steel

Номер: US20130129560A1
Автор: Michio Nakata, Tooru Matsuhashi
Принадлежит: Individual

A ferritic stainless steel that generates only a small amount of black spots in weld zone, the steel containing, in mass %, 0.020% or less of C, 0.025% or less of N, 1.0% or less of Si, 1.0% or less of Mn, 0.035% or less of P, 0.01% or less of S, 16.0 to 25.0% of Cr, 0.12% or less of Al, 0.05 to 0.35% of Ti, and 0.0015% or less of Ca, and the balance consisting of Fe and unavoidable impurities, wherein the following formula 1 is satisfied. BI=3Al+Ti+0.5Si+200Ca≦0.8  (1) where Al, Ti, Si, and Ca in the formula 1 each denotes an amount of each element in mass % of the steel.

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Номер записи: 69
23-05-2013 дата публикации

Grain oriented electrical steel sheet and method for manufacturing the same

Номер: US20130129985A1
Автор: Hiroi Yamaguchi, Hirotaka Inoue, Seiji Okabe, Takeshi Omura
Принадлежит: JFE Steel Corp

A grain oriented electrical steel sheet may reduce iron loss of material with linear grooves formed thereon for magnetic domain refinement and offer excellent low iron loss properties when assembled as an actual transformer, where the steel sheet has sheet thickness of 0.30 mm or less, linear grooves are formed at intervals of 2-10 mm in the rolling direction, the depth of each of the linear grooves is 10 μm or more, the thickness of the forsterite film at bottom portions of the linear grooves is 0.3 μm or more, total tension applied to the steel sheet by the forsterite film and tension coating is 10.0 MPa or higher in rolling direction, and the proportion of eddy current loss in iron loss W 17/50 of the steel sheet is 65% or less when alternating magnetic field of 1.7 T and 50 Hz is applied to the steel sheet in the rolling direction.

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Номер записи: 70
23-05-2013 дата публикации

Grain oriented electrical steel sheet and method for manufacturing the same

Номер: US20130130043A1
Автор: Hiroi Yamaguchi, Seiji Okabe, Takeshi Omura
Принадлежит: JFE Steel Corp

A grain oriented electrical steel sheet is subjected to magnetic domain refining treatment by electron beam irradiation and exhibits excellent low-noise properties when assembled as an actual transformer, in which a ratio (Wa/Wb) of a film thickness (Wa) of the forsierite film on a strain-introduced side of the steel sheet to a film thickness (Wb) of the forsierite film on a non-strain-introduced side of the steel sheet is 0.5 or higher, a magnetic domain discontinuous portion in a surface of the steel sheet on the strain-introduced side has an average width of 150 to 300 μm, and a magnetic domain discontinuous portion in a surface of the steel sheet on the non-strain-introduced side has an average width of 250 to 500 μm.

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Номер записи: 71
30-05-2013 дата публикации

STEEL WIRE OF SPECIAL STEEL AND WIRE ROD OF SPECIAL STEEL

Номер: US20130133789A1
Автор: GOTOHDA Hideaki, KAWANA Akifumi, OKONOGI Makoto, YAMASAKI Shingo
Принадлежит:

A predetermined composition is had, when a C content is represented by (C %), in a case of (C %) being not less than 0.35% nor more than 0.65%, a volume fraction of pearlite is 64×(C %)+52% or more, and in a case of (C %) being greater than 0.65% and 0.85% or less, the volume fraction of pearlite is not less than 94% nor more than 100%, and a structure of the other portion is composed of one or two of proeutectoid ferrite and bainite. Further, in a region to a depth of 1.0 mm from a surface, a volume fraction of pearlite block having an aspect ratio of 2.0 or more is not less than 70% nor more than 95%, and a volume fraction of pearlite having an angle between an axial direction and a lamellar direction on a cross section parallel to the axial direction of 40° or less is 60% or more with respect to all pearlite. 1. A steel wire of special steel containing:in mass %;C: 0.35% to 0.85%;Si: 0.05% to 2.0%;Mn: 0.20% to 1.0%; andAl: 0.005% to 0.05%,a P content being 0.030% or less,a S content being 0.030% or less, anda balance being composed of Fe and inevitable impurities, whereinwhen a C content is represented by (C %), in a case of (C %) being not less than 0.35% nor more than 0.65%, a volume fraction of pearlite is 64×(C %)+52% or more, and in a case of (C %) being greater than 0.65% and 0.85% or less, the volume fraction of pearlite is not less than 94% nor more than 100%, and a structure of the other portion is composed of one or two of proeutectoid ferrite or bainite,in a region up to a depth of 1.0 mm from a surface of the steel wire, a volume fraction of pearlite block having an aspect ratio of 2.0 or more is not less than 70% nor more than 95%, and a volume fraction of pearlite having an angle between an axial direction of the steel wire and a lamellar direction of the perlite on a cross section parallel to the axial direction of 40° or less is 60% or more with respect to all pearlite, anda tensile strength is 1200 MPa or more and less than 1500 MPa.2. The steel ...

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Номер записи: 72
30-05-2013 дата публикации

HIGH TENSILE STRENGTH HOT ROLLED STEEL SHEET HAVING EXCELLENT FORMABILITY AND METHOD FOR MANUFACTURING THE SAME

Номер: US20130133790A1
Автор: Ariga Tamako, Mega Tetsuya, Nakajima Katsumi
Принадлежит: JFE STEEL CORPORATION

Described is a high tensile strength hot rolled steel sheet having high strength and formability, and a manufacturing method. It has tensile strength≧980 MPa and excellent formability, and specifically identified ranges by mass % of C, Si, Mn, P, S, N, Al, Ti, V, Solute V, and Solute Ti; (ii) microstructure with fine carbides dispersion precipitated therein, the fine carbides containing Ti and V and having the average particle diameter<10 nm, as well as volume ratio with respect to the entire microstructure≧0.007; and matrix as ferrite phase having area ratio with respect to the entire microstructure≧97%. C, Ti, V, S and N satisfy (1) Ti≧0.08+(N/14×48+S/32×48) and (2) 0.8≦(Ti/48+V/51)/(C/12)≦1.2, where “C”, “Ti”, “V”, “S” and “N” represent contents (mass %) of corresponding elements, respectively. 1. A high tensile strength hot rolled steel sheet having tensile strength of at least 980 MPa and excellent formability , comprising: C: 0.07% to 0.13% (inclusive of 0.07% and 0.13%),', 'Si: 0.3% or less,', 'Mn: 0.5% to 2.0% (inclusive of 0.5% and 2.0%),', 'P: 0.025% or less,', 'S: 0.005% or less,', 'N: 0.0060% or less,', 'Al: 0.06% or less,', 'Ti: 0.08% to 0.14% (inclusive of 0.08% and 0.14%),', 'V: 0.15% to 0.30% (inclusive of 0.15% and 0.30%),', 'Solute V: 0.04% to 0.1% (inclusive of 0.04% and 0.1%),', 'Solute Ti: 0.05% or less, and', 'remainder consisting of Fe and incidental impurities;, 'a composition including by mass %,'}microstructure with fine carbides dispersion precipitated therein, the fine carbides containing Ti and V and having the average particle diameter of less than 10 nm, as well as volume ratio with respect to the entire microstructure of at least 0.007; and [{'br': None, 'Ti≧0.08+(N/14×48+S/32×48)\u2003\u2003(1)'}, {'br': None, '0.8≦(Ti/48+V/51)/(C/12)≦1.2\u2003\u2003(2)'}], 'matrix as ferrite phase having area ratio with respect to the entire microstructure of at least 97%, wherein contents of C, Ti, V, S and N satisfy formula (1) and formula (2) ...

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Номер записи: 73
30-05-2013 дата публикации

High-strength cold rolled sheet having excellent formability and crashworthiness and method for manufacturing the same

Номер: US20130133792A1
Автор: Saiji Matsuoka, Shinjiro Kaneko, Tatsuya Nakagaito, Yoshiyasu Kawasaki
Принадлежит: JFE Steel Corp

A high-strength cold rolled steel sheet has excellent formability and crashworthiness and includes, on a mass % basis, C: 0.05 to 0.3%, Si: 0.3 to 2.5%. Mn: 0.5 to 3.5%, P: 0.003 to 0.100%, 5: 0.02% or less, Al: 0.010 to 0.5%, the balance being iron and unavoidable impurities, the high-strength cold rolled steel sheet having a microstructure including 20% or more of ferrite on an area fraction basis, 10 to 60% of tempered martensite on an area fraction basis, 0 to 10% of martensite on an area fraction basis, and 3 to 15% of retained austenite on a volume fraction basis.

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Номер записи: 74
30-05-2013 дата публикации

Complex metallographic structured high strength steel and method of manufacturing

Номер: US20130136950A1
Автор: Weiping Sun
Принадлежит: Nucor Corp

A multi-phase steel sheet having microstructure having in combination ferrite, martensite of between 3% and 65% by volume, and at least one microstructure selected from the group consisting of, bainite and retained austenite, and having fine complex precipitates selected from the group of TiC, NbC, TiN, NbN, (Ti.Nb)C, (Ti.Nb)N, and (Ti.Nb)(C.N) particles having at least 50% smaller than 20 nm in size, and physical properties having tensile strength greater than about 780 megapascals and at least one of the properties of elongation greater than about 10%, yield ratio greater than about 70%, and hole expansion ratio greater than about 50%.

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Номер записи: 75
13-06-2013 дата публикации

STEEL FOR CARBURIZING, CARBURIZED STEEL COMPONENT, AND METHOD OF PRODUCING THE SAME

Номер: US20130146180A1
Автор: Kubota Manabu
Принадлежит: NIPPON STEEL & SUMITOMO METAL CORPORATION

A steel for a carburizing and a carburized steel component having a steel portion and a carburized layer with a thickness of more than 0.4 mm to less than 2 mm which is formed on an outside of the steel portion. A chemical composition of the steel for the carburizing and the steel portion of the carburized steel component satisfies simultaneously equations of a hardness parameter, a hardenability parameter, and a TiC precipitation parameter. 1. A steel for a carburizing comprising as a chemical composition , by mass % ,C: 0.07% to 0.13%,Si: 0.0001% to 0.50%,Mn: 0.0001% to 0.80%,S: 0.0001% to 0.100%,Cr: more than 1.30% to 5.00%,B: 0.0005% to 0.0100%,Al: 0.0001% to 1.0%,Ti: 0.010% to 0.10%,N: limited to 0.0080% or less,P: limited to 0.050% or less,O: limited to 0.0030% or less, anda balance consisting of iron and unavoidable impurities,wherein amounts expressed in mass % of each element in the chemical composition satisfy simultaneouslya following Equation 1 as a hardness parameter,a following Equation 2 as a hardenability parameter, and [{'br': None, '0.10 Подробнее

Номер записи: 76
13-06-2013 дата публикации

STEEL FOR CARBURIZING, CARBURIZED STEEL COMPONENT, AND METHOD OF PRODUCING THE SAME

Номер: US20130146181A1
Автор: Kubota Manabu
Принадлежит: NIPPON STEEL & SUMITOMO METAL CORPORATION

A steel for a carburizing and a carburized steel component having a steel portion and a carburized layer with a thickness of more than 0.4 mm to less than 2 mm which is formed on an outside of the steel portion. A chemical composition of the steel for the carburizing and the steel portion of the carburized steel component satisfies simultaneously equations of a hardness parameter, a hardenability parameter, and an AlN precipitation parameter. 1. A steel for a carburizing comprising as a chemical composition , by mass % ,C: 0.07% to 0.13%,Si: 0.0001% to 0.50%,Mn: 0.0001% to 0.80%,S: 0.0001% to 0.100%,Cr: more than 1.30% to 5.00%,B: 0.0005% to 0.0100%,Al: 0.070% to 0.200%,N: 0.0030% to 0.0100%,Ti: limited to 0.020% or less,P: limited to 0.050% or less,O: limited to 0.0030% or less, anda balance consisting of iron and unavoidable impurities,wherein amounts expressed in mass % of each element in the chemical composition satisfy simultaneously,a following Equation 1 as a hardness parameter,a following Equation 2 as a hardenability parameter, and [{'br': None, '0.10 Подробнее

Номер записи: 77
13-06-2013 дата публикации

Method of producing non-oriented electrical steel sheet

Номер: US20130146187A1
Автор: Masaaki Kohno, Yoshiaki Zaizen, Yoshihiko Oda
Принадлежит: JFE Steel Corp

Disclosed is a method for producing a non-oriented magnetic steel sheet, wherein a steel slab that consists of 0.01-0.1 mass % of C, 4 mass % or less of Si, 0.05-3 mass % of Mn, 3 mass % or less of Al, 0.005 mass % or less of S, 0.005 mass % or less of N and the balance made up of Fe and unavoidable impurities is subjected to hot rolling, cold rolling and final annealing. By carrying out the final annealing, while setting the average heating rate during the heating to 100° C./sec or more and setting the soaking temperature within the temperature range of 750-1100° C., a non-oriented magnetic steel sheet that has extremely increased magnetic flux density in the rolling direction of the steel sheet is advantageously produced.

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Номер записи: 78
13-06-2013 дата публикации

HEAT-RESISTANT FERRITIC STAINLESS STEEL SHEET HAVING EXCELLENT OXIDATION RESISTANCE

Номер: US20130149187A1
Автор: HAMADA Junichi, INOUE Yoshiharu, KANNO Norihiro, TERAOKA Shinichi
Принадлежит: NIPPON STEEL & SUMIKIN STAINLESS STEEL SHEET CORPORATION

A heat-resistant ferritic stainless steel sheet having excellent oxidation resistance while being low in cost and optimal for use in exhaust system components, wherein mass % falls within the following ranges: C: 0.015% or less, N: 0.020% or less, P: 0.04% or less, S: 0.001% or less, Si: 0.3-1.5% or less, Mn: 0.3-0.7% or less, Cr: 11.0-17.0%, Cu: 0.8-1.5%, Ni: 0.05-1.0%, V: 0.5% or less, Al: over 0.01 up to 0.1%, Ti: 10(C+N) to 0.3%. Also, the element content of the elements in the ferritic stainless steel sheet having excellent oxidation and thermal resistance has been mutually adjusted in a manner such that the value of γ defined in formula (1) is 35 or less. 1. A ferritic stainless steel sheet having excellent heat resistant and oxidation resistance comprising: by mass % ,C: 0.015% or less,N: 0.020% or less,P: 0.04% or less,S: 0.01% or less,Si: 0.3 to 1.5%,Mn: 0.3 to 0.7%,Cr: 11.0 to 17.0%,Cu: 0.8 to 1.5%,Ni: 0.05 to 1.0%,V: 0.5% or less,Al: 0.01 to 0.1%, andTi: 10(C+N) to 0.3%;the amounts of the elements being mutually adjusted such that the γ-value which is defined by the following formula (1), becomes 35 or less, and {'br': None, 'γ=23[% Ni]+9[% Cu]+7[% Mn]−11.5[% Cr]−11.5[% Si]−52[% Al]−49[[Ti %]−4([% C]+[% N])]−23 [% V]−12[% Mo]−47[% Nb]+189\u2003\u2003(1).'}, 'has a balance of Fe and unavoidable impurities2. The ferritic stainless steel sheet having excellent heat-resistance and oxidation resistance as set forth in claim 1 , wherein said stainless steel sheet further comprises claim 1 , by mass % claim 1 , at least one or more selected from the group consisting ofNb: 0.001 to 0.3%,Mo: 0.01 to 0.5%, andB: 0.0003 to 0.0050%.3. The ferritic stainless steel sheet having excellent heat-resistance and oxidation resistance as set forth in claim 1 , wherein said stainless steel sheet further comprises claim 1 , by mass % claim 1 , at least one or more selected from the group consisting ofZr: 1.0% or less,Sn: 1.0% or less, andCo: 0.5% or less.4. The ferritic ...

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Номер записи: 79
13-06-2013 дата публикации

C+N AUSTENITIC STAINLESS STEEL HAVING GOOD LOW-TEMPERATURE TOUGHNESS AND A FABRICATION METHOD THEREOF

Номер: US20130149188A1
Автор: HWANG Byoung Chul, LEE Tae Ho
Принадлежит: KOREA INSTITUTE OF MACHINERY & MATERIALS

A C+N austenitic stainless steel includes 15 to 20% by weight of chromium (Cr), 8 to 12% by weight of manganese (Mn), 3% or less by weight of nickel (Ni), and 0.5 to 1.0% by weight of a total content (C+N) of carbon (C) and nitrogen (N), remainder iron (Fe), and other inevitable impurities. A ratio (C/N) of the carbon (C) to the nitrogen (N) ranges from 0.5 to 1.5. It is possible to provide austenitic stainless steel having excellent low-temperature toughness while satisfying the requirements of strength, ductility, and pitting corrosion resistance and minimizing the nickel content 1. A C+N austenitic stainless steel comprising:15 to 20% by weight of chromium (Cr);8 to 12% by weight of manganese (Mn);3% or less by weight of nickel (Ni); and0.5 to 1.0% by weight of a total content (C+N) of carbon (C) and nitrogen (N);remainder iron (Fe); andother inevitable impurities,wherein a ratio (C/N) of the carbon (C) to the nitrogen (N) ranges from 0.5 to 1.5.2. The C+N austenitic stainless steel of claim 1 , wherein the ratio (C/N) of the carbon (C) to the nitrogen (N) ranges from 0.5 to 1.0.3. A fabrication method of C+N austenitic stainless steel claim 1 , comprising:a master alloy charging step of charging a master alloy into a vacuum melting furnace;a vacuum maintaining step of maintaining a vacuum state of the vacuum melting furnace into which the master alloy is charged;a master alloy melting step of melting the master alloy by heating the vacuum melting furnace;a nitrogen content adjusting step of injecting a nitrogen gas into the vacuum melting furnace;a molten ally stirring step of stirring the molten master alloy;an ingot forming step of forming an ingot by tapping the molten alloy stirred in the vacuum melting furnace;a hot rolling step of hot-rolling the formed ingot; anda cooling step of cooling the hot-rolled stainless steel,wherein the C+N austenitic stainless steel includes 15 to 20% by weight of chromium (Cr); 8 to 12% by weight of manganese (Mn); 3% or less ...

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Номер записи: 80
13-06-2013 дата публикации

Method of producing cold-rolled steel sheet as well as cold-rolled steel sheet and members for automobile

Номер: US20130149526A1
Автор: Hiroyuki Masuoka, Satoru Ando, Shunsuke Yamamoto
Принадлежит: JFE Steel Corp

In a method of producing a cold-rolled steel sheet being excellent in not only the phosphate treatability but also the corrosion resistance after coating under severe corrosion environment such as hot salt water immersion test or composite cycle corrosion test, a continuously annealed steel sheet after cold rolling preferably including 0.5-3.0 mass % of Si is pickled to remove a Si-containing oxide layer on a surface layer of the steel sheet and further repickled so that a surface covering ratio of an iron-based oxide on the surface of the steel sheet is not more than 40% and preferably a maximum thickness of the iron-based oxide is not more than 150 nm, as well as a cold-rolled steel sheet produced by this method and a member for automobile using the cold-rolled steel sheet.

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Номер записи: 81
20-06-2013 дата публикации

HOT-ROLLED STEEL SHEET, COLD-ROLLED STEEL SHEET, GALVANIZED STEEL SHEET, AND METHODS OF MANUFACTURING THE SAME

Номер: US20130153091A1
Автор: Fujita Nobuhiro, Hayashi Kunio, Kishimoto Tetsuo, Okamoto Riki, Takahashi Manabu, YOSHIDA Hiroshi
Принадлежит: NIPPON STEEL & SUMITOMO METAL CORPORATION

A hot-rolled steel sheet has an average value of the X-ray random intensity ratio of a {100} <011> to {223} <110> orientation group at least in a sheet thickness central portion that is in a sheet thickness range of ⅝ to ⅜ from a steel sheet surface of 1.0 to 6.0, an X-ray random intensity ratio of a {332} <113> crystal orientation of 1.0 to 5.0, rC which is an r value in a direction perpendicular to a rolling direction of 0.70 to 1.10, and r30 which is an r value in a direction that forms an angle of 30° with respect to the rolling direction of 0.70 to 1.10. 1. A hot-rolled steel sheet comprising , by mass %:C: 0.0001% to 0.40%;Si: 0.001% to 2.5%;Mn: 0.001% to 4.0%;P: 0.001% to 0.15%;S: 0.0005% to 0.03%;Al: 0.001% to 2.0%;N: 0.0005% to 0.01%;O: 0.0005% to 0.01%;and further comprising one or two or more of:Ti: 0.001% to 0.20%;Nb: 0.001% to 0.20%;V: 0.001% to 1.0%;W: 0.001% to 1.0%;B: 0.0001% to 0.0050%;Mo: 0.001% to 1.0%;Cr: 0.001% to 2.0%;Cu: 0.001% to 2.0%;Ni: 0.001% to 2.0%;Co: 0.0001% to 1.0%;Sn: 0.0001% to 0.2%;Zr: 0.0001% to 0.2%;As: 0.0001% to 0.50%;Mg: 0.0001% to 0.010%;Ca: 0.0001% to 0.010%; andREM: 0.0001% to 0.1%;and balance composed of iron and inevitable impurities,wherein an average value of an X-ray random intensity ratio of a {100} <011> to {223}<110> orientation group at least in a sheet thickness central portion that is in a sheet thickness range of ⅝ to ⅜ from a steel sheet surface is 1.0 to 6.0, an X-ray random intensity ratio of a {332} <113> crystal orientation is 1.0 to 5.0; andrC which is an r value in a direction perpendicular to a rolling direction is 0.70 to 1.10, and r30 which is an r value in a direction that forms an angle of 30° with respect to the rolling direction is 0.70 to 1.10.2. The hot-rolled steel sheet according to claim 1 ,wherein rL which is an r value in the rolling direction is 0.70 to 1.10, and r60 which is an r value in a direction that forms an angle of 60° with respect to the rolling direction is 0.70 to 1.10.3. The ...

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Номер записи: 82
20-06-2013 дата публикации

Alloy material for r-t-b-based rare earth permanent magnet, method for producing r-t-b-based rare earth permanent magnet, and motor

Номер: US20130154424A1
Автор: Kenichiro Nakajima, Takashi Yamazaki
Принадлежит: Showa Denko KK

An alloy material for an R-T-B-based rare earth permanent magnet, including (i) an R-T-B-based alloy composed of R being two or more members selected from rare earth elements, T being a transition metal that essentially contains Fe, B and unavoidable impurities, and in which the Dy content is more than 10% by mass and less than 31% by mass, and (ii) a metal powder. Also disclosed is a method for producing an R-T-B-based rare earth permanent magnet and a motor provided with the R-T-B-based rare earth permanent magnet.

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Номер записи: 83
20-06-2013 дата публикации

STEEL FOR INDUCTION HARDENING AND CRANKSHAFT MANUFACTURED USING THE SAME

Номер: US20130156630A1
Автор: Mizobe Yuta, Tahira Hiroaki, Yoshino Kan
Принадлежит: NIPPON STEEL & SUMITOMO METAL CORPORATION

There is provided a steel for induction hardening in which cracks are less liable to occur and high hardness and seizure resistance are attained even if a tempering process after induction hardening is omitted. The steel for induction hardening according to the present invention contains, by mass percent, C: 0.20 to 0.34%, Si: at most 0.20%, Mn: 0.75 to 2.0%, P: at most 0.03%, S: at most 0.20%, Cr: 0.05 to 1.2%, Ti: at least 0.002% and less than 0.030%, Al: 0.005 to 0.04%, and N: 0.0040 to 0.020%, the balance being Fe and impurities, and satisfies Formula (1): 2. A crankshaft manufactured by induction-hardening the steel for induction hardening according to .3. The crankshaft according to claim 2 , which is manufactured by being not tempered. The present invention relates a steel for induction hardening and a crankshaft manufactured using the same. More particularly, the present invention relates to a steel for induction hardening that is used for a crankshaft manufactured by induction hardening, and a crankshaft manufactured using the steel for induction hardening.Some crankshaft is manufactured by being subjected to induction hardening and tempering followed by grinding. Induction hardening induces residual stress in steel. The residual stress causes cracks such as quenching cracks and grinding cracks. Tempering reduces residual stress and restrains the occurrence of cracks.If a tempering process can be omitted, the manufacturing cost goes down. However, cracks attributable to the residual stress induced at the time of induction hardening are liable to occur. For this reason, there has been a demand for a steel for induction hardening in which cracks are less liable to occur even if a tempering process is omitted in the manufacturing process of a crankshaft.JP61-186419A, JP2000-26933A, JP2005-256134A, and JP2007-113063A disclose steels which are used for manufacturing a hot forged product and a crankshaft, and in which cracks attributable to induction hardening ...

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Номер записи: 84
27-06-2013 дата публикации

HIGH STRENGTH HOT ROLLED STEEL SHEET HAVING EXCELLENT TOUGHNESS AND METHOD FOR MANUFACTURING THE SAME

Номер: US20130160904A1
Автор: Funakawa Yoshimasa, Moriyasu Noriaki, Murata Takayuki, Nakajima Katsumi, Saito Hayato
Принадлежит:

The steel sheet includes C: 0.04 to 0.12%, Si: 0.5 to 1.2%, Mn: 1.0 to 1.8%, P: not more than 0.03%, S: not more than 0.0030%, Al: 0.005 to 0.20%, N: not more than 0.005% and Ti: 0.03 to 0.13%, the balance being Fe and inevitable impurities, includes a microstructure containing a bainite phase at an area fraction exceeding 95% and having an average grain diameter of not more than 3 μm, has a difference ΔHv1 of not more than 50 between a Vickers hardness value at 50 μm from the surface and a Vickers hardness value at ¼ of a sheet thickness, has a difference ΔHv2 of not more than 40 between the Vickers hardness value at ¼ of the sheet thickness and a Vickers hardness value at ½ of the sheet thickness. 1. A high strength hot rolled steel sheet with excellent toughness , which comprises , in terms of mass % , C: 0.04 to 0.12% , Si: 0.5 to 1.2% , Mn: 1.0 to 1.8% , P: not more than 0.03% , S: not more than 0.0030% , Al: 0.005 to 0.20% , N: not more than 0.005% and Ti: 0.03 to 0.13% , the balance being Fe and inevitable impurities , contains a bainite phase at an area fraction exceeding 95% , the bainite phase having an average grain diameter of not more than 3 μm , has a difference ΔHv1 of not more than 50 between a Vickers hardness value at 50 μm from the surface and a Vickers hardness value at ¼ of a sheet thickness , has a difference ΔHv2 of not more than 40 between the Vickers hardness value at ¼ of the sheet thickness and a Vickers hardness value at ½ of the sheet thickness , the sheet thickness being not less than 4.0 mm and not more than 12 mm , and has a tensile strength of not less than 780 MPa.2. The high strength hot rolled steel sheet with excellent toughness according to claim 1 , wherein the steel sheet further comprises claim 1 , in terms of mass % claim 1 , Ni: 0.01 to 0.50%.3. The high strength hot rolled steel sheet with excellent toughness according to claim 1 , wherein the steel sheet further comprises claim 1 , in terms of mass % claim 1 , one claim 1 ...

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Номер записи: 85
27-06-2013 дата публикации

HIGH STRENGTH COLD ROLLED STEEL SHEET HAVING EXCELLENT STRETCH FLANGEABILITY AND METHOD FOR MANUFACTURING THE SAME

Номер: US20130160907A1
Автор: Kawabe Hidetaka, Nishizawa Masanori, Seto Kazuhiro
Принадлежит:

A steel is subjected to a hot rolling step, a cold rolling step, and an annealing step having a maximum achieving temperature: 800° C. to 900° C., two-step heating, and two-step cooling. The two-step heating includes first-step heating to (maximum achieving temperature—(10° C. to 50° C.)) at an average temperature raising rate: 0.5° C. to 5.0° C./s and second-step heating in which the temperature raising time from that temperature range to the maximum achieving temperature is specified to be 30 to 150 s. Two-step cooling includes first-step cooling to cool from the maximum achieving temperature at a cooling rate of 10° C. to 40° C./s and second-step cooling to cool to a temperature range of 400° C. to 500° C. at a cooling rate of 0.2 to 0.8 times the first-step cooling rate for a cooling time of 0.2 to 0.8 times the total cooling time. 2. The high strength cold rolled steel sheet according to claim 1 , further comprising Ca: 0.0001% to 0.0050% on a percent by mass basis in the composition.4. The method for manufacturing a high strength cold rolled steel sheet according to claim 3 , wherein the steel further contains Ca: 0.0001% to 0.0050% on a percent by mass basis in the composition. This application is the U.S. National Phase application of PCT International Application No. PCT/JP2011/070665, filed Sep. 5, 2011, and claims priority to Japanese Patent Application Nos. 2010-199040, filed Sep. 6, 2010, and 2011-179329, filed Aug. 19, 2011, the disclosures of each of these being incorporated herein by reference in their entireties for all purposes.The present invention relates to a high strength cold rolled steel sheet suitable for use as automobile parts and the like, which are press-formed into complicated shapes. In particular, the present invention relates to an improvement in stretch flangeability. Here, a term “high strength steel sheet” refers to a steel sheet having high strength of a tensile strength: 590 MPa or more. In addition, a term “steel sheet” here ...

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Номер записи: 86
04-07-2013 дата публикации

Alloy of a Golf Club

Номер: US20130167978A1
Автор: Chen Chan-Tung, Tsai Wen-Ching
Принадлежит: FUSHENG PRECISION CO., LTD.

An alloy of a golf club comprises 0.25 wt % to 1.0 wt % Si, 0.25 wt % to 1.5 wt % Mn, 2.0 wt % to 3.5 wt % Cu, 6.0 wt % to 8.0 wt % Ni, 15.5 wt % to 18.0 wt % Cr, balance iron and inevitable impurities, wherein the alloy of a golf club has austenite structures, ferrite structures, and martensite structures simultaneously. 1. An alloy of a golf club comprising:0.25 wt % to 1.0 wt % Si;0.25 wt % to 1.5 wt % Mn;2.0 wt % to 3.5 wt % Cu;6.0 wt % to 8.0 wt % Ni;15.5 wt % to 18.0 wt % Cr; andbalance iron and inevitable impurities, wherein the alloy of a golf club has austenite structures, ferrite structures, and martensite structures.2. The alloy of a golf club as claimed in claim 1 , wherein Ni is in a range of 6.5 wt % to 8.0 wt %.3. The alloy of a golf club as claimed in claim 1 , wherein Si is in a range of 0.5 wt % to 1.0 wt %.4. The alloy of a golf club as claimed in claim 1 , wherein Mn is in a range of 0.5 wt % to 1.5 wt %.5. The alloy of a golf club as claimed in claim 1 , wherein Cu is in a range of 2.5 wt % to 3.5 wt %.6. The alloy of a golf club as claimed in claim 1 , wherein Cr is in a range of 16.0 wt % to 17.5 wt %.7. The alloy of a golf club as claimed in claim 1 , wherein the alloy of a golf club further comprises carbon being less than 0.08 wt %. 1. Field of the InventionThe present invention generally relates to an alloy of a golf club and, more particularly, to an alloy of a golf club that is apt to provide preferable shock-absorbing effect.2. Description of the Related ArtGenerally, an integral forming hosel portion of a golf club requires easy justifying a dipangle thereof, in accordance with different requirements of various users. Accordingly, conventional golf club is primary made of soft iron having lower hardness, such as materials like low-carbon steel and low-alloy steel, so as to facilitate dipangle-justifying of the hosel portion of a golf club requires. However, the soft iron has disadvantages of easily-oxidized and corrosion- ...

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Номер записи: 87
04-07-2013 дата публикации

HIGH-STRENGTH STEEL SHEET AND HIGH-STRENGTH ZINC-COATED STEEL SHEET WHICH HAVE EXCELLENT DUCTILITY AND STRETCH-FLANGEABILITY AND MANUFACTURING METHOD THEREOF

Номер: US20130167980A1
Автор: KAWATA Hiroyuki, Maruyama Naoki, Murasato Akinobu, Suzuki Noriyuki, Wakabayashi Chisato, Yoshinaga Naoki
Принадлежит: NIPPON STEEL & SUMITOMO METAL CORPORATION

This high-strength steel sheet includes by mass percentage: 0.05 to 0.4% of C; 0.1 to 2.5% of Si; 1.0 to 3.5% of Mn; 0.001 to 0.03% of P; 0.0001 to 0.01% of S; 0.001 to 2.5% of Al; 0.0001 to 0.01% of N; 0.0001 to 0.008% of O; and a remainder composed of iron and inevitable impurities, wherein a steel sheet structure contains by volume fraction 10 to 50% of a ferrite phase, 10 to 50% of a tempered martensite phase, and a remaining hard phase, wherein a 98% hardness is 1.5 or more times as high as a 2% hardness in a range from ⅛ to ⅜ of a thickness of the steel sheet, wherein a kurtosis K* of the hardness distribution between the 2% hardness and the 98% hardness is −1.2 to −0.4, and wherein an average crystal grain size in the steel sheet structure is 10 μm or less. 1. A high-strength steel sheet which has an excellent ductility and a stretch-flangeability , the steel sheet comprising by mass percentage:0.05 to 0.4% of C;0.1 to 2.5% of Si;1.0 to 3.5% of Mn;0.001 to 0.03% of P;0.0001 to 0.01% of S;0.001 to 2.5% of Al;0.0001 to 0.01% of N;0.0001 to 0.008% of O; anda remainder composed of iron and inevitable impurities,wherein a steel sheet structure contains by volume fraction 10 to 50% of a ferrite phase, 10 to 50% of a tempered martensite phase, and a remaining hard phase,wherein when a plurality of measurement regions with diameters of 1 μM or less are set in a range from ⅛ to ⅜ of a thickness of the steel sheet, hardness measurement values in the plurality of measurement regions are arranged in ascending order to obtain a hardness distribution, an integer N0.02 which is a number obtained by multiplying a total number of the hardness measurement values by 0.02 and, if present, by rounding up a decimal number, is obtained, a hardness of a measurement value which is an N0.02-th largest value from a smallest hardness measurement value is regarded as a 2% hardness, an integer N0.98 which is a number obtained by multiplying the total number of the hardness measurement ...

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Номер записи: 88
04-07-2013 дата публикации

SUPER BAINITE STEEL AND METHOD FOR MANUFACTURING IT

Номер: US20130167983A1
Автор: CLARKE RICHARD, Davies Paul, Madill John, Rose Andrew James, Smith Andrew, Thomas Alun
Принадлежит: TATA STEEL UK LIMITED

The invention relates to a super bainite steel consisting of the following elements in weight %: C: 0.4-1.1 Mn: 0.4-2.1 Si: 0.15-1.2 Al: 0.0-2.0 Cr: 0.0-1.4 Ni: 0.0-2.5 Mo: 0.0-0.6 V: 0.0-0.3 Co: 0.0-3.0 P: <0.025 S: <0.025 the balance being iron and unavoidable impurities. The invention also relates to a method for manufacturing such a super bainite steel. 1. Super bainite steel consisting of the following elements in weight %:C: 0.4-1.1Mn: 0.4-2.1Si: 0.15-1.2Al: 0.0-2.0Cr: 0.0-1.4Ni: 0.0-2.5Mo: 0.0-0.6V: 0.0-0.3Co: 0.0-3.0P: <0.025S: <0.025the balance being iron and unavoidable impurities.2. Super bainite steel according to claim 1 , wherein the following elements are present in weight %:C: 0.4-1.0 and/orMn: 0.7-2.1 and/orSi: 0.4-1.1 and/orAl: 0.0-1.0 and/orCr: 0.3-1.2 and/orNi: 0.0-1.0 and/orMo: 0.01-0.4 and/orV: 0.0-0.2 and/orCo: 0.0-2.0.3. Super bainite steel according to claim 2 , wherein the following elements are present in weight %:C: 0.6-0.9 and/orMn: 0.8-1.4 and/orSi: 0.7-1.0 and/orAl: <0.1 and/orCr: 0.7-1.1 and/orMo: 0.01-0.2 and/orNi: <0.1 and/orV: <0.1 and/orCo: <0.5.4. (canceled)5. Super bainite steel according to claim 1 , wherein the steel is provided in the form of plates claim 1 , strip and/or sheets having a thickness dimension of 0-25 mm claim 1 , preferably a thickness of 2-15 mm claim 1 , and a width dimension of at least 400 mm.6. Super bainite steel according to claim 1 , wherein the steel has a microstructure of retained austenite up to 30 percent with a balance of carbide-free bainite laths and bainite laths with intra-granular carbides present claim 1 , the bainite laths having an average thickness below 100 nm.7. Super bainite steel according to claim 1 , wherein the steel is provided in plates having perforations providing a weight reduction of 0-50% claim 1 , the perforations preferably having an opening width or a diameter between 2 and 15 mm.8. Super bainite steel according to claim 5 , wherein the plate has been leveled to achieve a ...

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Номер записи: 89
04-07-2013 дата публикации

High strength hot rolled steel sheet having excellent bendability and method for manufacturing the same

Номер: US20130167985A1
Автор: Hayato Saito, Katsumi Nakajima, Noriaki Moriyasu, Takayuki Murata, Yoshimasa Funakawa
Принадлежит: JFE Steel Corp

A steel sheet including C at 0.05 to 0.15%, Si at 0.2 to 1.2%, Mn at 1.0 to 2.0%, P at not more than 0.04%, S at not more than 0.0030%, Al at 0.005 to 0.10%, N at not more than 0.005% and Ti at 0.03 to 0.13%, the balance being Fe and inevitable impurities, includes surface regions having an area fraction of bainite of less than 80% and an area fraction of a ferrite phase with a grain diameter of 2 to 15 μm of not less than 10%, the surface regions extending from both surfaces of the steel sheet each to a depth of 1.5 to 3.0% relative to a total sheet thickness, as well as an inner region other than the surface regions having an area fraction of a bainite phase of more than 95%, and has a tensile strength of not less than 780 MPa.

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Номер записи: 90
04-07-2013 дата публикации

Low Iron Loss High Strength Non-Oriented Electromagnetic Steel Sheet and Method for Manufacturing Same

Номер: US20130167987A1
Автор: Jae-Kwan Kim, Jae-Song Kim, Su-Yong Sin, Yong-Soo Kim
Принадлежит: Posco Co Ltd

Provided is a low iron loss high strength non-oriented electromagnetic steel sheet and a method for manufacturing the same. The method comprises hot-rolling a slab comprising 0.005 weight % or less of C, 4.0 weight % or less of Si, 0.1 weight % or less of P, 0.03 weight % or less of S, 0.1 to 2.0 weight % of Mn, 0.3 to 2.0 weight % of Al, 0.003 weight % or less of N, 0.005 weight % or less of Ti, the remainder being Fe and unavoidable impurities, cold-rolling the slab, and finally annealing the slab such that the fractional area of the non-recrystallization tissue at the cross sectional surface of the steel sheet is 50% or lower (not including 0%).

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Номер записи: 91
11-07-2013 дата публикации

GRAIN ORIENTED STEEL STRIP WITH HIGH MAGNETIC CHARACTERISTICS, AND MANUFACTURING PROCESS OF THE SAME

Номер: US20130174940A1
Автор: Abbruzzese Giuseppe, Cicale Stefano, Claret Ribeiro Silva Ronaldo, Da Cunha Marco Antonio, De Araujo Quintao Helcio, De Faria Fonseca Angelo Jose
Принадлежит:

A method for the production of hot-rolled steel strip comprising the following steps: providing a steel slab comprising, in weight percentages: Si: 2.5 to 3.5%, C: 0.05 to 0.1%, Mn: 0:05 to 0.1%, Als: 0.015 to 0.026%, N: 0.0050 to 0.0100%, and further comprising S and/or Se so that S+ (32/79) Se is in an amount of 0.018 to 0.030%, and optionally comprising one or more elements chosen among Sb in an amount of 0.015 to 0.035%, Cu in an amount of 0.08% to 0.25%, Sn in an amount of 0.06% to 0.15%, P in an amount of 0.005% to 0.015%, the balance being iron and unavoidable impurities, reheating said slab to a temperature between 1300° C. and 1430° C., roughing hot-rolling said slab to produce a blank having a thickness below 50 mm, finishing hot-rolling of said blank to produce a hot rolled strip in three rolling passes or more, the temperature of said blank during the first pass being above 1150° C. and at least one rolling pass being performed with a reduction of 40% or more and being immediately followed by a holding of more than 20 sec, the average interpass holding temperature Tav being settled between 1000 and 1200° C., the total finishing hot rolling time t being controlled so that the value of Tav for any portion of said strip further respects the under mentioned equation: T>T+α(t−78) [eq. 1] with T=992.2+1493(Als) and α=1.204+24.9(Als), Tand being expressed in ° C., t in seconds and Alin weight %, cooling of said hot-rolled strip from the finish rolling temperature to a temperature below 600° C. in less than 10 sec and coiling of said hot-rolled strip. 1. A method for the production of hot-rolled steel strip comprising the successive following steps , in this order: Si: 2.5 to 3.5%,', 'C: 0.05 to 0.1%,', 'Mn: 0.05 to 0.1%,', 'Als: 0.015 to 0.026%,', 'N: 0.0050 to 0.0100%,, 'providing a steel slab comprising, in weight percentagesand further comprising S and/or Se so that S+ (32/79) Se is in an amount of 0.018 to 0.030%,optionally comprising one or more elements ...

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Номер записи: 92
11-07-2013 дата публикации

High-Strength Steel Material Having Outstanding Ultra-Low-Temperature Toughness and a Production Method Therefor

Номер: US20130174941A1
Автор: Cho Hyun-Kwan, Choi Jong-Kyo, Jang Woo-Kil, Noh Hee-Goon, Um Kyung-Keun
Принадлежит: POSCO

The present invention provides steel containing manganese and nickel that is used as a structural material for a cryogenic storage container for liquefied natural gas (LNG) or the like, and a manufacturing method thereof; and more particularly, to steel having good cryogenic temperature toughness and also high strength by adding low-cost Mn instead of relatively expensive Ni at an optimized ratio, refining a microstructure through controlled rolling and cooling, and precipitating retained austenite through tempering, and a manufacturing method of the steel. To achieve the object, the technical feature of the present invention is a method of manufacturing high-strength steel with cryogenic temperature toughness. In the method, a steel slab is heated to a temperature within a range of 1,000 to 1,250° C., wherein the steel slab includes, by weight: 0.01-0.06% of carbon (C), 2.0-8.0% of manganese (Mn), 0.01-6.0% of nickel (Ni), 0.02-0.6% of molybdenum (Mo), 0.03-0.5% of silicon (Si), 0.003-0.05% of aluminum (Al), 0.0015-0.01% of nitrogen (N), 0.02% or less of phosphorous (P), 0.01% or less of sulfur (S), with a remainder of iron (Fe) and other unavoidable impurities. Then, the heated slab is finish-rolled at a temperature of 950° C. or less at a rolling reduction rate of 40% or more. The rolled steel is cooled to a temperature of 400° C. or less at a cooling rate of 2° C./s or more. Thereafter, the steel is tempered for 0.5-4 hours to a temperature within a range of 550 to 650° C. after the cooling. 1. High-strength steel with good cryogenic temperature toughness , comprising , by weight: 0.01-0.06% of carbon (C) , 2.0-8.0% of manganese (Mn) , 0.01-6.0% of nickel (Ni) , 0.02-0.60 of molybdenum (Mo) , 0.03-0.5% of silicon (Si) , 0.003-0.050 of aluminum (Al) , 0.0015-0.01% of nitrogen (N) , 0.02% or less of phosphorous (P) , 0.01% or less of sulfur (S) , with a remainder of iron (Fe) and other unavoidable impurities.2. The high-strength steel with good cryogenic ...

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Номер записи: 93
11-07-2013 дата публикации

STEEL PLATE FOR PRODUCING LIGHT STRUCTURES AND METHOD FOR PRODUCING SAID PLATE

Номер: US20130174942A1
Автор: Bonnet Frédéric, BOUAZIZ Olivier, CHEVALLOT Jean-Claude
Принадлежит: ArcelorMittal France

The invention relates to a steel plate, the chemical composition of which comprises, the contents being expressed by weight: 0.010%≦C≦0.20%, 0.06%≦Mn≦3%, Si≦1.5%, 0.005%≦Al≦1.5%, S≦0.030%, P≦0.040%, 2.5%≦Ti≦7.2%, (0.45×Ti)−0.35%≦B≦(0.45×Ti)+0.70%, and optionally one or more elements chosen from: Ni≦1%, Mo≦1%, Cr≦3%, Nb≦0.1%, V≦0.1%, the balance of the composition consisting of iron and inevitable impurities resulting from the smelting. 1: A steel plate , the chemical composition of which comprises steel , the contents being expressed by weight:0.010%≦C≦0.20%0.06%≦Mn≦3%Si≦1.5%0.005%≦Al≦1.5%S≦0.030%P≦0.040%,titanium and boron in amounts such that:2.5%≦Ti≦7.2%(0.45×Ti)−0.35%≦B≦(0.45×Ti)+0.70%optionally one or more elements chosen from:Ni≦1%Mo≦1%Cr≦3%Nb≦0.1%V≦0.1%,the balance of the composition consisting of iron and inevitable impurities resulting from the smelting.2. The steel plate as claimed in claim 1 , wherein the titanium and boron contents are such that:−0.22≦B−(0.45×Ti)≦0.35.3. The steel plate as claimed in claim 1 , wherein the titanium and boron contents are such that:−0.35≦B−(0.45×Ti)<−0.22.4. The steel plate of claim 1 , characterized in that the titanium content is such that:4.6%≦Ti≦6.9%.5. The steel plate as claimed in claim 4 , wherein the titanium content is such that:4.6%≦Ti≦6%.6. The steel plate of claim 1 , wherein its composition comprises claim 1 , the content being expressed by weight:C≦0.080%.7. The steel plate of claim 1 , wherein its composition comprises claim 1 , the content being expressed by weight:C≦0.050%.8. The steel plate of claim 1 , wherein its composition comprises claim 1 , the content being expressed by weight:Cr≦0.08%.9. The steel plate of claim 1 , wherein it comprises TiBand optionally FeB eutectic precipitates claim 1 , the mean size of which is equal to or less than 15 microns.10. The steel plate of claim 1 , wherein it comprises TiBand optionally FeB eutectic precipitates claim 1 , the mean size of which is equal to or less ...

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Номер записи: 94
11-07-2013 дата публикации

CASE HARDENED STEEL AND METHOD FOR PRODUCING SAME

Номер: US20130174943A1
Автор: Nagahama Mutsuhisa, Okamoto Nariaki
Принадлежит: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)

A case hardened steel with excellent cold forgeability and excellent impact properties after case hardening processing contains C, Si, Mn, S, Cr, Al, Ti, Nb, B, and N, with the balance being iron and unavoidable impurities. Of precipitates containing Ti and/or Nb, precipitates having a size of not less than 20 μmare at a number density of not more than 1.0/mm. Of precipitates containing Ti and/or Nb, precipitates having a size of more than 5 μmand less than 20 μmand containing Mn and S are at a number density of more than 0.7/mmand not more than 3.0/mm. The ferrite fraction is more than 77% by area. 1. A case hardened steel comprising:C: 0.05 to 0.3% (% by mass; hereinafter the same applies to chemical component composition),Si: 0.01 to 0.6%,Mn: 0.20 to 1.0%,S: 0.001 to 0.025%,Cr: 1 to 2.5%,Al: 0.01 to 0.10%,Ti: 0.01 to 0.10%,Nb: 0.01 to 0.10%,B: 0.0005 to 0.005%, andN: 0.002 to 0.02%, with the balance being iron and unavoidable impurities,{'sup': 2', '2, 'wherein, of precipitates containing Ti and/or Nb, precipitates having a size of not less than 20 μmare at a number density of not more than 1.0/mm,'}{'sup': 2', '2', '2', '2, 'wherein, of precipitates containing Ti and/or Nb, precipitates having a size of more than 5 μmand less than 20 μmand containing Mn and S are at a number density of more than 0.7/mmand not more than 3.0/mm, and'}wherein the ferrite fraction is more than 77% by area.2. The case hardened steel according to claim 1 , further comprising Mo: not more than 2% (excluding 0%).3. The case hardened steel according to claim 1 , further comprising Cu: not more than 0.1% (excluding 0%) and/or Ni: not more than 0.3% (excluding 0%).4. A method for producing a case hardened steel claim 1 , comprising{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'subjecting a steel having the chemical component composition of to'}casting at a cooling rate of not less than 2.5° C./min from 1500° C. to 800° C.,blooming at a heating temperature of 1100 to 1200° C., and{'sub ...

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Номер записи: 95
11-07-2013 дата публикации

BEARING STEEL AND INGOT MATERIAL FOR BEARING HAVING EXCELLENT ROLLING CONTACT FATIGUE LIFE CHARACTERISTICS AND METHOD FOR MANUFACTURING THE SAME

Номер: US20130174945A1
Автор: Hase Kazukuni, Honjo Minoru, Kimura Tatsumi, Mitao Shinji
Принадлежит:

The present invention provides bearing steel, comprising a chemical composition including by mass %, C: 0.56%≧[% C]≦0.70%, Si: 0.15%≦[% Si]<0.50%, Mn: 0.60%≦[% Mn]≦1.50%, Cr: 0.50%≦[% Cr]≦1.10%, Mo: 0.05%≦[% Mo]≦0.5%, P: [% P]≦0.025%, S: [% S]≦0.025%, Al: 0.005%≦[% Al]≦0.500%, O: [% O]≦0.0015%, N: 0.0030%≦[% N]≦0.015%, and remainder as Fe and incidental impurities. 1. Bearing steel , comprising a chemical composition including by mass % ,C: 0.56% to 0.70% (inclusive of 0.56% and 0.70%),Si: 0.15% to 0.50% (inclusive of 0.15% and exclusive of 0.50%)Mn: 0.60% to 1.50% (inclusive of 0.60% and 1.50%),Cr: 0.50% to 1.10% (inclusive of 0.50% and 1.10%),Mo: 0.05% to 0.5% (inclusive of 0.05% and 0.5%),P: 0.025% or less,S: 0.025% or lessAl: 0.005% to 0.500% (inclusive of 0.005% and 0.500%),O: 0.0015% or lessN: 0.0030% to 0.015% (inclusive of 0.0030% and 0.015%), and remainder as Fe and incidental impurities, [{'br': None, 'i': 'Ec', '=(−0.07×[% Si]−0.03×[% Mn]+0.04×[% Cr]−0.36×[% Al]+0.79)−[% C]\u2003\u2003(1)'}, {'br': None, 'i': C', '/C, 'sub': Mo(max)', 'Mo(ave), 'Degree of segregation=\u2003\u2003(2)'}], 'wherein “eutectic carbide formation index Ec” represented by following formula (1) is in the range of 0 Подробнее

Номер записи: 96
11-07-2013 дата публикации

HIGH STRENGTH STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME

Номер: US20130174946A1
Автор: Fushiwaki Yusuke, Suzuki Yoshitsugu
Принадлежит:

A method for manufacturing such steel sheet includes continuous annealing of a steel sheet which includes, in terms of mass %, C at 0.01 to 0.18%, Si at 0.4 to 2.0%, Mn at 1.0 to 3.0%, Al at 0.001 to 1.0%, P at 0.005 to 0.060% and S at ≦0.01%, the balance being represented by Fe and inevitable impurities, in such a manner that the dew point of the atmosphere is controlled to become not more than −45° C. during the course of soaking when the annealing furnace inside temperature is in the range of not less than 820° C. and not more than 1000° C. as well as that the dew point of the atmosphere is controlled to become not more than −45° C. during the course of cooling when the annealing furnace inside temperature is in the range of not less than 750° C. 1. A method for manufacturing high strength steel sheets , comprising continuous annealing of a steel sheet which includes , in terms of mass % , C at 0.01 to 0.18% , Si at 0.4 to 2.0% , Mn at 1.0 to 3.0% , Al at 0.001 to 1.0% , P at 0.005 to 0.060% and S at ≦0.01% , the balance being represented by Fe and inevitable impurities , in such a manner thatthe dew point of the atmosphere is controlled to become not more than −45° C. during the course of soaking when the annealing furnace inside temperature is in the range of not less than 820° C. and not more than 1000° C. as well as that the dew point of the atmosphere is controlled to become not more than −45° C. during the course of cooling when the annealing furnace inside temperature is in the range of not less than 750° C.2. The method for manufacturing high strength steel sheets according to claim 1 , wherein the chemical composition of the steel sheet further includes one or more elements selected from B at 0.001 to 0.005% claim 1 , Nb at 0.005 to 0.05% claim 1 , Ti at 0.005 to 0.05% claim 1 , Cr at 0.001 to 1.0% claim 1 , Mo at 0.05 to 1.0% claim 1 , Cu at 0.05 to 1.0% and Ni at 0.05 to 1.0% in terms of mass %.3. The method for manufacturing high strength steel sheets ...

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Номер записи: 97
11-07-2013 дата публикации

High-Toughness Cold-Drawn Non-Heat-Treated Wire Rod, and Method for Manufacturing Same

Номер: US20130174947A1
Автор: Kim Dong-hyun, Lee You-Hwan
Принадлежит: POSCO

Provided is a wire rod for use in mechanical structure connections, vehicle components, or the like, and more particularly, to a wire rod which has superior toughness without being subjected to a heat treatment, and the strength of which is ensured through a cold-drawing process. Tot his end, provided are a high-toughness cold-drawn non-heat-treated wire rod and a method for manufacturing the same, wherein the wire rod comprises in % by weight: 0.2 to 0.3% of carbon (C), 0.1 to 0.2% of silicon (Si), 2.5 to 4.0% of manganese (Mn), 0.035% or less (but not 0%) of phosphorus (P), 0.04% or less (but not 0%) of sulfur (S), the remainder being iron (Fe) and unavoidable impurities. 1. A high toughness cold-drawn non-heat treated wire rod comprising carbon (C): 0.2-0.3% , silicon (Si): 0.1-0.2% , manganese (Mn): 2.5-4.0% , phosphorus (P): 0.035% or less (except 0) , sulfur (S): 0.04% or less (except 0) , the remainder iron (Fe) , and other inevitable impurities , as a percentage by weight.2. The high toughness cold-drawn non-heat treated wire rod of claim 1 , wherein the microstructure of the wire rod comprises de-generated pearlite.3. The high toughness cold-drawn non-heat treated wire rod of claim 2 , wherein the de-generated pearlite has an area fraction of not less than 90% claim 2 , and the remainder is ferrite.4. The high toughness cold-drawn non-heat treated wire rod of claim 2 , wherein the de-generated pearlite comprises cementite having a thickness of not more than 100 nm.5. The high toughness cold-drawn non-heat treated wire rod of claim 2 , wherein the de-generated pearlite comprises cementite having an aspect ratio (width:thickness) of 30:1 or less.6. The high toughness cold-drawn non-heat treated wire rod of claim 1 , wherein the wire rod has a tensile strength ranging from 650 Mpa to 750 Mpa.7. The high toughness cold-drawn non-heat treated wire rod of claim 1 , wherein the wire rod has a tensile strength ranging from 1300 Mpa to 1500 Mpa and a V-impact ...

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Номер записи: 98
11-07-2013 дата публикации

AUSTENITE-FERRITE STAINLESS STEEL OF IMPROVED MACHINABILITY

Номер: US20130174948A1
Автор: Bourgin Christophe, Chauveau Eric, Fanica Amelie, Mantel Marc, Peultier Jerome, Renaudot Nicolas
Принадлежит:

The invention concerns an austenite-ferrite stainless steel composition, whose composition contains in % by weight: 2. Steel according to claim 1 , moreover characterized in that:IRCGU≧34.3. Steel according to any one of to claim 1 , moreover characterized in that the proportion of ferrite is between 35 and 55% by volume.4. Steel according to any one of to claim 1 , moreover characterized in that45≦IF≦555. Steel according to any one of to claim 1 , moreover characterized in that the nitrogen content is between 0.12 and 0.18% by weight.6. Steel according to any one of to claim 1 , moreover characterized in that the copper content is between 2.0 and 2.8% by weight.7. Steel according to any one of to claim 1 , moreover characterized in that the molybdenum content is less than 0.5% by weight.8. Steel according to any one of to claim 1 , moreover characterized in that the carbon content is less than 0.05% by weight.9. Method of manufacture of a plate claim 1 , a band claim 1 , or a coil of hot-rolled steel according to any one of to claim 1 , in which:{'claim-ref': [{'@idref': 'CLM-00001', 'claims 1'}, {'@idref': 'CLM-00008', '8'}], 'one provides an ingot or a slab of a steel with a composition according to any one of to ,'}one hot-rolls said ingot or said slab at a temperature between 1150 and 1280° C. to obtain a plate, a band, or a coil.10. Method of manufacture of a hot-rolled plate of steel according to claim 9 , in which:one hot rolls said ingot or said slab at a temperature between 1150 and 1280° C. to obtain a so-called quarto plate, thenone performs a heat treatment at a temperature between 900 and 1100° C., andone cools said plate by quenching in air.12. Method of manufacture according to claim 11 , whereby one performs a cold drawing of said bar or a wire drawing of said wire claim 11 , at the end of the cooling.13. Method of manufacture of a steel profile claim 11 , whereby one performs a cold profiling of a hot-rolled bar obtained by the method of .14. ...

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Номер записи: 99
11-07-2013 дата публикации

AUSTENITIC HIGH MN STAINLESS STEEL AND METHOD PRODUCTION OF SAME AND MEMBER USING THAT STEEL

Номер: US20130174949A1
Автор: Fujii Hideki, Fukumoto Shigeo, Hatano Masaharu, OHMIYA Shinichi
Принадлежит: NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATION

Inexpensive stainless steel and inexpensive and high strength stainless steel which has excellent hydrogen environment embrittlement resistance even if used in a hydrogen resistant environment in over 40 MPa high pressure hydrogen gas or a hydrogen resistant environment in liquid hydrogen, characterized by containing, by mass %, C: 0.1% or less, Si: 0.4 to 1.5%, Mn: 8 to 11%, Cr: 15 to 17%, Ni: 5 to 8%, Cu: 1 to 4%, and N: 0.01 to less than 0.15% and having a balance of Fe and unavoidable impurities, having a volume rate of δ-ferrite of 10% or less, and having a long axis of δ-ferrite before annealing of 0.04 to 0.1 mm. 114.-. (canceled)15. Austenitic high Mn stainless steel characterized by containing , by mass % , C: 0.1% or less , Si: 0.4 to 1.5% , Mn: 8 to 11% , Cr: 15 to 17% , Ni: 5 to 8% , Cu: 1 to 4% , Mo: 0.05 to 0.3% , and N: 0.01 to less than 0.15% and having a balance of Fe and unavoidable impurities , having a volume rate of δ-ferrite of 5% or less , and having a long axis of δ-ferrite of 0.05 mm or less.16. Austenitic high Mn stainless steel characterized by containing , by mass % , C: 0.1% or less , Si: 0.4 to 1.5% , Mn: 8 to 11% , Cr: 15 to 17% , Ni: 6 to 8% , Cu: 1 to 4% , Mo: 0.05 to 0.3% , and N: 0.15 to 0.3% and having a balance of Fe and unavoidable impurities , having a volume rate of δ-ferrite of 5% or less , and having a long axis of δ-ferrite of less than 0.05 mm.17. The austenitic high Mn stainless steel as set forth in characterized in that said steel further contains claim 15 , by mass % claim 15 , one or more types of elements selected from Al: 0.2% or less claim 15 , B: 0.01% or less claim 15 , Ca: 0.01% or less claim 15 , Mg: 0.01% or less claim 15 , and REM: 0.1% or less.18. The austenitic high Mn stainless steel as set forth in characterized in that said steel further contains claim 16 , by mass % claim 16 , one or more types of elements selected from Al: 0.2% or less claim 16 , B: 0.01% or less claim 16 , Ca: 0.01% or less claim 16 , ...

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Номер записи: 100