ТРУБА ИЗ НЕРЖАВЕЮЩЕЙ АУСТЕНИТНОЙ СТАЛИ С ОТЛИЧНОЙ СТОЙКОСТЬЮ К ОКИСЛЕНИЮ ПАРОМ И СПОСОБ ЕЕ ПОЛУЧЕНИЯ

... 1. Труба из аустенитной нержавеющей стали с отличной стойкостью к окислению водяным паром, которая содержит, в мас.%, от 14 до 28% Cr и от 6 до 30% Ni, причем в структуре металла на глубине от 5 до 20 мкм от внутренней поверхности стальной трубы существует область, удовлетворяющая формуле (1)где g в формуле (1) является величиной, рассчитываемой из формулы (2),где значения символов в формуле (2) следующие:g: объемное отношение (%);α: полная сумма числа пикселей на цифровом изображении в зоне, в которой разупорядоченность ориентации соседних кристаллов, обнаруженная на диаграмме направленности обратного рассеяния электронов, составляет от 5° до 50°С;β: полное число пикселей на цифровом изображении в зоне измерения при использовании диаграммы направленности обратного рассеяния электронов;ε: ширина шага при анализе диаграммы направленности обратного рассеяния электронов (мкм);δ: ширина межзеренной границы (мкм).2. Труба по п.1, в которой размер кристаллического зерна в стальной трубе равен ...

ТОЛСТОСТЕННАЯ СВАРНАЯ СТАЛЬНАЯ ТРУБА С ПРЕВОСХОДНОЙ НИЗКОТЕМПЕРАТУРНОЙ УДАРНОЙ ВЯЗКОСТЬЮ, СПОСОБ ИЗГОТОВЛЕНИЯ ТОЛСТОСТЕННОЙ СВАРНОЙ СТАЛЬНОЙ ТРУБЫ С ПРЕВОСХОДНОЙ НИЗКОТЕМПЕРАТУРНОЙ УДАРНОЙ ВЯЗКОСТЬЮ И СТАЛЬНАЯ ПЛАСТИНА ДЛЯ ИЗГОТОВЛЕНИЯ ТОЛСТОСТЕННОЙ СВАРНОЙ СТАЛЬНОЙ ТРУБЫ

... 1. Толстостенная сварная стальная труба с превосходной низкотемпературной ударной вязкостью, имеющая толщину стенки от 25 до 45 мм, которая сформирована из основного материала стальной пластины, свернутой в трубообразную форму для линейной сварки, и имеет крупнозернистую HAZ, в которойосновной материал стальной пластины имеет химический состав, содержащий, в % по массе:С: от 0,03% до 0,085%,Mn: от 1,45% до 1,85%,Ti: от 0,005 до 0,020%,Nb: от 0,005 до 0,050%, иО: от 0,0005 до 0,005%, иSi: ограниченный как 0,15% или менее,Al: ограниченный как 0,015% или менее,Р: ограниченный как 0,02% или менее,S: ограниченную до 0,005% или менее, иMo: ограниченный как 0,20% или менее, иимеющий уровни содержания Mn и Mo, удовлетворяющие приведенному ниже (Выражению 1), значение Pcm, полученное по нижеприведенному (Выражению 2), варьирующее от 0,16 до 0,19, и остальное количество составлено Fe и неизбежными примесями,причем структура металла основного материала стальной пластины состоит из феррита, составляющего ...

Steel alloy and tube manufactured therefrom

... 1,146,785. Alloy steel. NIPPON KOKAN K.K. May 18, 1967 [Sept.10, 1966], No.23205/67. Heading C7A. A high tensile strength steel, for making tubes, tubes or die blocks, comprises;- C 0À1 - 0À23% Cr 0À1 - 0À5% Mn 1 - 1À5% Al 0À01 - 0À08% Cu less than 0À3% P less than 0À04% S less than 0À04 and Si 0À2 - 0À5% the balance apart from impurities, being iron.

STEEL TUBE FOR CAMP ELEMENTS AND PROCEDURE FOR ITS PRODUCTION AND CUTS

Steel compositions for special uses

HIGH-STRENGTH STEEL EXCELLENT IN LOW TEMPERATURE TOUGHNESS AND TOUGHNESS AT WELD HEAT-AFFECTED ZONE, METHOD FOR PRODUCING THE SAME, AND METHOD FOR PRODUCING HIGH-STRENGTH STEEL PIPE

The present invention provides an ultra-high- strength steel pipe excellent in weldability on site and a method for producing the steel pipe by improving the reliability of the low temperature toughness of a steel to which elements to enhance hardenability are added for furthering high-strengthening and also improving toughness at a weld heat affected zone subjected to double or more layer welding and, in the method, the steel is made to consist of a structure composed of bainite and/or martensite by containing prescribed amounts of C, Si, Mn, P, S, Ni, Mo, Nb, Ti, Al and N, and, as occasion demands, one or more of B, V, Cu, Cr, Ca, REM and Mg, and regulating C, Si, Mn, Cr, Ni, Cu, V and Mo, those being elements to enhance hardenability, by a specific relational expression. The diameter of prior austenite grains may be regulated in a prescribed range. The method includes the steps of heating a casting to a temperature not lower than the Ac3 point, hot rolling it, and thereafter cooling ...

MARTENSITIC STAINLESS STEEL TUBE AND MANUFACTURING METHOD THEREOF

A martensitic stainless steel pipe wherein it has a chemical composition in which the contents of C, Si, Mn and Cr are respectively limited to specific ranges, and wherein the scale formed on the outer surface of the pipe has a porosity in a specific range depending on the thickness thereof. The steel pipe can exhibit an improved accuracy in the detection of defects by a non- destructive inspection such as ultrasonic flaw detection, which results in the improved efficiency in the non-destructive inspection, and is also advantageous in that it has improved atmosphere corrosion resistance. Accordingly, the above steel pipe and a method for production thereof can be suitably utilized in all the applications wherein use is made of a martensitic stainless steel pipe having a chemical composition equivalent to the above.

AUSTENITIC STAINLESS STEEL PIPE EXCELLENT IN STEAM OXIDATION RESISTANCE AND MANUFACTURING METHOD THEREFOR

Provided is an austenitic stainless steel tube having excellent steam oxidation resistance. The steam oxidation-resistant austenitic stainless steel tube contains, by mass %, 14-28% of Cr, and 6-30% of Ni, and has a region in the metal structure thereof at a depth of 5-20µm from the internal surface which fulfils the following formula. (a/ß)×d/e×100 = 0.3, with the symbols in general formula (1) representing the following. a is the total of the number of pixels in a digital image of a region in which the orientation difference detected using electron backscatter diffraction is 5-50 degrees between adjacent crystals; ß is the total number of pixels in the digital image of the region measured using electron backscatter diffraction pattern; e is the analysis pitch (µm) of the electron backscatter diffraction; and d is the grain boundary width (µm).

FERRITIC-AUSTENITIC DUPLEX STAINLESS STEEL

Ferritic-austenitic duplex stainless steel comprising the following components in the following proportions in % by weight: 0 < C ? 0.08, Si 0.2 - 2.0, Mn 0.2 - 2.0, Cr 19.0 - 30.0, Ni 3.0 - 9.0, Mo 1.0 - 5.0, Cu 0.5 - 3.0, Co 0.2 - 4.0, N 0.05 - 0.35, the balance being substantially .epsilon.e and inevitable impurities, the proportions of Cr and Ni having the correlation of 19.0 ? Cr < 24.0 and 3.0 ? Ni ? 8.0, or 24.0 ? Cr ? 30.0 and 4.0 ? Ni ? 9.0 the micro structure of the steel containing delta-ferrite phase in an amount of 30 to 70% in area ratio.

AS-PIERCED TUBULAR PRODUCTS

As-pierced steel casing is made by heating a killed steel consisting of 0.20-0.35 carbon, 1.0-2.0 manganese, up to about 0.60 silicon, up to about 0.04 each of phosphorous and sulfur, 0.05-0.25 vanadium, from 0.005-0.025 nitrogen and/or from 0.0100.10 columbium, and the balance iron, to a temperature of at least about 2200.degree.F to dissolve vanadium carbides, piercing the steel, and allowing said steel to cool to effect precipitation of vanadium carbides with resulting refinement of austenite to a grain size of about ASTM 5 or finer and of ferrite to a grain size of about ASTM 7 or finer. The resulting pierced steel has a yield strength of 80-110 ksi, a minimum ultimate tensil strength of 100 ksi, a minimum elongation of 12-1/2% in two inches, and a ferrite-pearlite microstructure having a ferrite grain size of about ASTM 7 or finer.

WELDED CORROSION-RESISTANT FERRITIC STAINLESS STEEL TUBING AND A CATHODICALLY PROTECTED HEAT EXCHANGER CONTAINING THE SAME

Welded ferritic stainless steel tubing having high resistance to hydrogen embrittlement particularly adapted for use in heat exchangers handling chemical media containing hydrogen sulfide or nascent hydrogen and in cathodically protected heat exchangers. The ferritic stainless steel of the welded tubing consists essentially of, in weight percent, carbon at least 0.002, nitrogen at least 0.002, carbon plus nitrogen 0.02 max. and preferably 0.01 to 0.02, chromium 23 to 28, preferably 25 to 28, manganese up to 1, preferably up to 0.5, nickel 1 to 4, silicon up to 1, preferably up to 0.5, phosphorus up to 0.04, sulfur up to 0.02, preferably up to 0.005, molybdenum 2 to 5, preferably 2 to 4, aluminum up to 0.1, columbium 0.60 max. with columbium being at least equal to eight times carbon plus nitrogen, and the balance iron and incidental impurities.

STEEL COMPOSITIONS FOR SPECIAL USES

On recherche des aciers présentant une excellente tenue dans le temps, sous ambiance de corrosion par des milieux oxydants tels que, par exemple, des fumées ou la vapeur d'eau, sous pression et/ou température élevées. Il est proposé une composition d'acier pour applications spéciales, qui se situe dans la zone comprenant, en teneur en poids, environ 1,8 à 11 % de Chrome (et préférentiellement entre environ 2,3 et 10 % de Chrome), moins de 1 % de Silicium, et entre 0,20 et 0,45 % de Manganèse. Il s'est avéré possible d'ajuster les teneurs de la composition selon un modèle prédéterminé, choisi pour obtenir des caractéristiques de corrosion sensiblement optimales dans des conditions données de performances à haute température. Ce modèle peut faire intervenir comme addition ou comme résiduel au moins un élément choisi parmi le molybdène, le tungstène, le cobalt, et le nickel.

HIGH-STRENGTH WELDED STEEL PIPE AND METHOD FOR PRODUCING THE SAME

A high-strength welded steel pipe is obtained by welding a seam weld portion of a steel plate that are formed in a pipe shape. In the high-strength welded steel pipe, a base metal of the steel plate includes, by mass%, C: 0.010% to 0.080%, Si: 0.01% to 0.50%, Mn: 0.50% to 2.00%, S: 0.0001% to 0.0050%, Ti: 0.003% to 0.030%, Mo: 0.05% to 1.00%, B: 0.0003% to 0.0100%, O: 0.0001% to 0.0080%, N: 0.006% to 0.0118%, P: limited to 0.050% or less, Al: limited to 0.008% or less, and the balance of Fe and inevitable impurities, Ceq is 0.30 to 0.53, Pcm is 0.10 to 0.20, [N] - [Ti] / 3.4 is less than 0.003, the average grain size of the prior .gamma. grains in heat affected zones in the steel plate is 250 µm or less, and the prior .gamma. grains include bainite and intragranular bainite.

Procédé pour l'amélioration des propriétés physiques d'une pièce moulée cylindrique

Verfahren zur Herstellung von Lagerbestandteilen, insbesondere Innenringen, für Wälzlager

ТРУБЫ НЕФТЯНОГО СОРТАМЕНТА ДЛЯ РАЗВАЛЬЦОВКИ В СКВАЖИНЕ И СПОСОБ ИХ ПРОИЗВОДСТВА

An oil assortment pipe for expansion, according to the invention, is expanded in a well. The oil assortment pipe for the expansion in the well has a chemical composition which contains by mass: from 0.05 to 0.08% C, 0.50% or below Si, from 0.80 to 1.30% Mn, 0.030% or below P, 0.020% or below S, from 0.08 to 0.50% Cr, 0.01% or below N, from 0.005 to 0.06% Al, 0.05% or below Ti, 0.50% or below Cu, and 0.50% or below Ni, and the rest are Fe and impurities, and a structure having a ferrite content of 80% or above. The oil assortment pipe for the expansion in the well has a yield strength of 276 MPa to 379 MPa and the uniform elongation of 16% or above. Thus the oil assortment pipe, according to the invention, has excellent expandability.

COMPOSITIONS OF STEELS FOR THE SPECIAL USES

Предложены стали, обладающие отличной устойчивостью во времени в условиях коррозии окислительными средами, такими как, например, дымовые газы или водяной пар под высоким давлением и/или при высокой температуре. Предложен состав стали для специальных применений, который находится в области, включающей в себя, в массовых процентах, приблизительно, от 1,8 до 11% хрома (предпочтительно, приблизительно от 2,3 до 10% хрома), меньше 1% кремния и от 0,20 до 0,45% марганца. Оказалось возможным подбирать содержания компонентов в составе согласно предварительно заданной модели, выбранной для того, чтобы получить оптимальные характеристики коррозии в заданных условиях функционирования при высокой температуре. Данная модель может заставить ввести в качестве добавки или в качестве остаточного продукта по меньшей мере один элемент, выбранный среди молибдена, вольфрама, кобальта и никеля. Steels having excellent time stability under corrosion conditions by oxidizing media, such as, for example, flue gases or water vapor under high pressure and / or at high temperature, are proposed. The composition of the steel for special applications is proposed, which is in the area including, in mass percent, from about 1.8 to 11% chromium (preferably from about 2.3 to 10% chromium), less than 1% silicon and 0.20 to 0.45% manganese. It turned out to be possible to select the contents of the components in the composition according to a predefined model selected in order to obtain optimal corrosion characteristics under given operating conditions at high temperature. This model may force at least one element selected among molybdenum, tungsten, cobalt and nickel to be added as an additive or as a residual product.

ТРУБЫ НЕФТЯНОГО СОРТАМЕНТА ДЛЯ РАЗВАЛЬЦОВКИ В СКВАЖИНЕ И СПОСОБ ИХ ПРОИЗВОДСТВА

Труба нефтяного сортамента для развальцовки согласно изобретению развальцовывается в скважине. Труба нефтяного сортамента для развальцовки в скважине имеет состав, включающий, в процентах по массе, от 0,05 до 0,08% С, самое большее 0,50% Si, от 0,80 до 1,30% Mn, самое большее 0,030% Р, самое большее 0,020% S, от 0,08 до 0,50% Cr, самое большее 0,01% N, от 0,005 до 0,06% Al, самое большее 0,05% Ti, самое большее 0,50% Cu и самое большее 0,50% Ni, а остальное составляет Fe и примеси, и структуру, имеющую долю феррита, по меньшей мере, 80%. Труба нефтяного сортамента для развальцовки в скважине имеет предел текучести в интервале от 276 до 379 МПа и однородное удлинение по меньшей мере 16%. Поэтому труба нефтяного сортамента согласно изобретению обладает высокой способностью к развальцовке.

TUBULAR DRAIN FOR FUEL INJECTION HAS HIGH PRESSURE AND ITS MANUFACTORING PROCESS

TUBE POUR INJECTION DE CARBURANT A HAUTE PRESSION. TUBE DE PETIT DIAMETRE ET DE FORTE EPAISSEUR EN ACIER DONT LA SURFACE INTERIEURE 4 EST CEMENTEE. ON TREMPE LA SURFACE EXTERIEURE 3 PUIS ON CHAUFFE PAR INDUCTION LA SURFACE INTERIEURE 4. ON OBTIENT SUR LA SURFACE INTERIEURE UNE STRUCTURE A MARTENSITE ET TROOSTITE. LA DURETE DE LA SURFACE INTERIEURE EST DE L'ORDRE DE150 A 230HV. APPLICATION AUX TUBES CONVOYANT DES LIQUIDES SOUS FORTE PRESSION. HIGH PRESSURE FUEL INJECTION TUBE. SMALL DIAMETER AND STRONG THICKNESS STEEL TUBE WHOSE INTERIOR SURFACE 4 IS CEMENTED. THE EXTERIOR SURFACE IS SOAKED 3 THEN THE INTERNAL SURFACE 4 IS HEATED BY INDUCTION. A MARTENSITE AND TROOSTITE STRUCTURE IS OBTAINED ON THE INTERNAL SURFACE. THE HARDNESS OF THE INTERIOR SURFACE IS IN THE ORDER OF 150 TO 230HV. APPLICATION TO TUBES CONVEYING LIQUIDS UNDER HIGH PRESSURE.

Tube à deux couches empêchant le dépôt de carbone, destiné à la manutention des composés carbones

Le tube à deux couches empêchant le dépôt de carbone, pour la manutention de composés carbonés, à une température non inférieure à 500 degre(s)C, est caractérisé en ce qu'il comprend : (a) une couche destinée à être exposée aux composés carbonés, réalisée en un alliage composé de chrome, de nickel et de fer, selon des proportions situées dans une région triangulaire I d'un diagramme d'équilibre; (b) une autre couche qui n'est pas exposée aux composés carbonés, réalisée en un alliage composé de chrome, de nickel et de fer, selon des proportions situées dans une région pentagonale II du diagramme d'équilibre.

STEEL PIPE HAVING HIGH FORMABILITY AND METHOD FOR PRODUCING THE SAME

A steel pipe having high formability which has an r value in the axial direction of 1.4 or more and exhibits, in a plane in the steel plate of the pipe at 1/2 thickness, an average of X-ray random intensity ratios with respect to the orientation group of {110}<110> to {332}<110> of 3.5 or more and/or an X-ray random intensity ratio of {110}<110> of 5.0 or more; and a method for producing the steel pipe having high formability characterized in that it comprises heating a parent steel pipe exhibiting, in a plane in the steel plate of the parent pipe at 1/2 thickness, X-ray random intensity ratios with respect to all the orientations of {001}<110>, {116}<110>, {114}<110> and {112}<110> of 3 or less to a temperature range of 650 to 1200 °, and subjecting it to a forming wherein a diameter reduction percentage is 30 % or more and a thickness reduction percentage is 5 to 30 %. The pipe is excellent in capability of being formed, in particular, of being hydroformed.

OIL WELL STEEL PIPE EXCELLENT IN CRUSHING RESISTANCE CHARACTERISTICS AFTER PIPE EXPANSION

A method for producing an oil well steel pipe excellent in crushing resistance characteristics after pipe expansion, which comprises subjecting a steel piece having a specific chemical composition, wherein the contents of C, Mn, P, S, Nb, Ti, Al and N are values of specific ranges, respectively, and the balance is constituted by iron and inevitable impurities, to a hot rolling, winding up the resulting steel belt at a temperature of 300°C or lower, and forming the steel belt into a cylindrical shape with no further processing, or which comprises heating a steel piece having a specific chemical composition, wherein the contents of C, Mn, P, S, Nb, Ti, Al and N are values of specific ranges, respectively, and the balance is constituted by iron and inevitable impurities, to a temperature from AC3 [°C] to 1150°C, and then cooling the resultant steel piece at a rate of 5 to 50°C/sec for the range of 400 to 800°C; and an oil well steel pipe produced by the method. The oil well steel pipe is reduced ...

Thin-walled small-bore steel tube with case hardened internal surface

The present invention relates to a process for hardening the interior surface of a long, thin-walled, small inside diameter, tubular member, such as a tube which would be used to form a downhole pump barrel. More particularly, it relates to a process involving progressive heating with an internally positioned, electro-magnetic induction coil, followed by immediate quenching with a quench ring assembly, to develop a martensitic case on the inner surface of the tube. The invention further extends to the apparatus utilized in conducting the process, and to the product tube itself.

Tube and other container

Process for manufacturing an airbag inflator bottle member

An airbag inflator bottle member comprising a tubular body having a reduced-diameter portion at an end portion for fitting an initiator or the like thereto in which the reduced-diameter portion has a good low temperature toughness comparable to that of the portion which is not reduced in diameter is manufactured by the following method. A steel tube having a composition comprising C: 0.05-0.20%, Si: 0.1-1.0%, Mn: 0.10-2.0%, Cr: 0.05-2.0%, sol. Al: at most 0.10%, Ca: 0.0003-0.01%, optionally one or more elements selected from Cu: at most 1.0%, Ni: at most 1.5%, Mo: at most 1.0%, V: at most 0.2%, Nb: at most 0.1%, and Ti: at most 0.1%, and a remainder of Fe and impurities in which P: at most 0.025% and S: at most 0.010% is subjected to cold working, then it is cut to a predetermined length, and the cut steel tube is subjected to reducing in at least one end portion thereof and then to quenching and tempering.

LOW YIELD RATIO HIGH STRENGTH STEEL AND ITS PRODUCTION

PURPOSE: To obtain a low yield ratio high strength steel for an automotive door reinforcing material or the like excellent in toughness by normalizing or low temp. tempering as well, by forming the componental compsn. of the steel in which components, particularly, the bainitic index is specified and sufficient strength and toughness can be obtd. CONSTITUTION: This low yield ratio high strength steel is constituted of, by weight, 0.15 to 0.40% C, 0.1 to 0.7% Si, 1.0 to 2.7% Mn, 1.0 to 3.5% Cr, 0.01 to 0.05% sol.Al, ≤0.025% P and ≤0.015% S, and the balance Fe. Then, its bainitic index (%) shown by -209C+43Si-48Mn-58Cr-0.416R+317 is regulated to 0 to 50%; where R denotes its cooling rate (°C/min) at the time of hardening for obtaining a martensitic structure. This steel is provided with ≥120kgf/mm2 tensile strength, ≤75% yield ratio and -40°C toughness value vTrs. Moreover, the same steel may be incorporated with prescribed amounts of Mo and Ni and further V, Ti, Nb and B. COPYRIGHT: (C)1994 ...

VERFAHREN ZUR ERHOEHUNG DER FESTIGKEIT VON STAHLROHREN

HIGH TEMPERATURE CELEBRATION STEEL TUBE WITH LOW SILICON CONTENT AND WITH IMPROVED ONE DUKTILITAETS AND FAEHIGKEITSEIGENSCHAFTEN.

SEAMLESS STEEL PIPE FOR LINE PIPE AND A PROCESS FOR ITS MANUFACTURE

A seamless steel pipe for line pipe having a high strength and good toughness and corrosion resistance even though having a thick wall has a chemical composition comprising, in mass percent, C: 0.02 - 0.08%, Si: at most 0.5%, Mn: 1.5 -3.0%, Al: 0.001 - 0.10%, Mo: greater than 0.4% to 1.2%, N: 0.002 - 0.015%, Ca: 0.0002 -0.007%, and a remainder of Fe and impurities, wherein the contents of the impurities are at most 0.03% for P, at most 0.005% for S, at most 0.005% for O and less than 0.0005% for B and wherein the value of Pcm calculated by the following Equation (1) is at least 0.185 and at most 0.250. The steel pipe has a microstructure which primarily comprises bainite and which has a length of cementite of at most 20 micrometers: Pcm = [C] + [Si]/30 + ([Mn] + [Cr] + [Cu])/20 + [Mo]/15 + [V]/10 + 5[B] ..... (1) wherein [C], [Si], [Mn], [Cr], [Cu], [Mo], [V] and [B] are numbers respectively indicating the content in mass percent of C, Si, Mn, Cr, Cu, Mo, V and B.

HIGH-CARBON STEEL PIPE HAVING SUPERIOR COLD WORKABILITY AND INDUCTION HARDENABILITY, AND MENTOD OF PRODUCING THE SAME

A high carbon steel pipe excellent in cold formability and high frequency hardenability, characterized in that it has a chemical composition, in mass %: C: 0.3 to 0.8 %, Si: 2 % or less, Mn: 3 % or less, and balance: Fe and inevitable impurities, and a structure wherein cementite has a particle diameter of 1.0 m or less; and a method for producing the high carbon steel pipe which comprises subjecting a material steel pipe having the above composition to a heating or soaking treatment and then subjecting the treated material tube to a stretch reducing wherein a cumulative diameter reduction percentage is 30 % or more. The method can be employed for producing a high carbon electric welded steel pipe excellent in cold formability and high frequency hardenability.

STEEL TUBE

ABSTRACT A steel tube having a small outside diameter and a large wall thickness, for use, for example, as a high pressure fuel injection pipe for a diesel engine, has a hardened layer on at least its internal surface. The hardened layer is formed by a diffusion layer which comprises a solid solution of nitrogen formed by tufftriding, and which is completely free from any intermetallic compounds, i.e. Fe3N and Fe4N. A method of manufacturing such a tube is also disclosed, and comprises tufftriding a steel tube in a molten bath of sodium cyanide while it is being axially vibrated, to form the diffusion layer, and heat treating the tube in a gaseous atmosphere to decompose any intermetallic compound on the diffusion layer.

HIGH-CARBON STEEL PIPE HAVING SUPERIOR COLD WORKABILITY AND INDUCTION HARDENABILITY, AND MENTOD OF PRODUCING THE SAME

A high carbon steel pipe excellent in cold formability and high frequency hardenability, characterized in that it has a chemical composition, in mass %: C: 0.3 to 0.8 %, Si: 2 % or less, Mn: 3 % or less, and balance: Fe and inevitable impurities, and a structure wherein cementite has a particle diameter of 1.0 m or less; and a method for producing the high carbon steel pipe which comprises subjecting a material steel pipe having the above composition to a heating or soaking treatment and then subjecting the treated material tube to a stretch reducing wherein a cumulative diameter reduction percentage is 30 % or more. The method can be employed for producing a high carbon electric welded steel pipe excellent in cold formability and high frequency hardenability.

SEAMLESS STEEL PIPE FOR LINE PIPE AND METHOD FOR PRODUCING SAME

Disclosed is a seamless steel pipe for line pipes which is suitable for flowlines or risers since it has high strength, excellent toughness and good corrosion resistance even when it is formed thick. This seamless steel pipe for line pipes has a chemical composition consisting of, in mass%, 0.02-0.08% of C, not more than 0.5% of Si, 1.5-3.0% of Mn, 0.001-0.10% of Al, more than 0.4% and not more than 1.2% of Mo, 0.002-0.015% of N, 0.0002-0.007% of Ca and one or two of REM in total, and the balance of Fe and impurities. In the impurities, P is not more than 0.05%, S is not more than 0.005%, and O is not more than 0.005%. The seamless steel pipe for line pipes satisfies the following formula: 0.8 <= [Mn] ~ [Mo] <= 2.6 (wherein [Mn] and [Mo] represent values equivalent to respective contents of Mn and Mo in mass%).

PIPE MOLD STEEL

MARTENSITIC STAINLESS STEEL PRODUCTS

A martensitic stainless steel product having a chromium content of 9 to 15 % by weight and a surface from which mill scales generated during production are removed by a shot blasting. The surface satisfies that, when a color image of the surface taken with 640 X 480 pixels is analyzed on blue color and a histogram of the pixel numbers and the tones divided into 0 to 255 classes is obtained, a relationship between the maximum frequency Yp and the tone value Xp at which Yp is counted satisfies an inequality, 800Xp - Yp - 27000 > 0. This steel product is superior in weatherability under atmospheric environments, and also superior in sulfide stress cracking resistance under environments containing hydro-sulfide.

MANUFACTORING PROCESS OF STEEL TUBES HAS DUCTILITY RAISED At low temperature

Canalisation tubulaire pour injection de carburant à haute pression et son procédé de fabrication.

TUBE POUR INJECTION DE CARBURANT A HAUTE PRESSION. TUBE DE PETIT DIAMETRE ET DE FORTE EPAISSEUR EN ACIER DONT LA SURFACE INTERIEURE 4 EST CEMENTEE. ON TREMPE LA SURFACE EXTERIEURE 3 PUIS ON CHAUFFE PAR INDUCTION LA SURFACE INTERIEURE 4. ON OBTIENT SUR LA SURFACE INTERIEURE UNE STRUCTURE A MARTENSITE ET TROOSTITE. LA DURETE DE LA SURFACE INTERIEURE EST DE L'ORDRE DE150 A 230HV. APPLICATION AUX TUBES CONVOYANT DES LIQUIDES SOUS FORTE PRESSION.

PROCEDE DE FABRICATION DE TUBES D'ACIER A DUCTILITE ELEVEE A BASSE TEMPERATURE

Fabrication de tubes en acier allié soudable pour conduites sous-marines d'hydrocarbures ayant une ductilité élevée aux basses températures. On coule un acier allié à bas carbone, moins de 0,08 % et à silicium au plus égal à 0,30 %, contenant également du manganèse et un métal générateur de carbures spéciaux comme le molybdène, le niobium, le vanadium, etc., dans un moule de centrifugation, et après centrifugation on fait subir au tube centrifugé un refroidissement contrôlé et un traitement thermique. Applications aux tubes de forage, aux tubes pour conduites sous-marines et aux tubes pour constructions de plates-formes de forage en mer dans les régions froides telles que les régions arctiques, et toutes applications nécessitant une ductilité élevée à basse température.

WELDED CORROSION RESISTANT FERRITIC STAINLESS STEEL TUBING AND A CATHODICALLY PROTECTED HEAT EXCHANGER CONTAINING THE SAME

STEEL PIPE AS FUEL INJECTION PIPE

A steel pipe as fuel injection pipe of 500 N/mm2 or higher tensile strength composed of, by mass, 0.12 to 0.27% C, 0.05 to 0.40% Si, 0.8 to 2.0% Mn and the balance Fe and impurities, the contents of Ca, P and S in the impurities being 0.001% or less, 0.02% or less and 0.01% or less, respectively, characterized in that the maximum diameter of nonmetallic inclusions present in at least the region extending from the inside surface of the steel pipe to a depth of 20 μm is 20 μm or less. Further, there is provided a steel pipe as fuel injection pipe which is identical with the above except that at least one member selected from among 1% or less Cr, 1% or less Mo, 0.04% or less Ti, 0.04% or less Nb and 0.1% or less V is further added thereto. These steel pipes as fuel injection pipes realize a high material strength, high limit internal pressure free from fatigue breakdown, prolonged fatigue life and high reliability. © KIPO & WIPO 2009 ...

STEEL PIPES FOR PARTS OF ELEMENTS OF LAME PEOPLE AND METHODS FOR PRODUCTION AS WELL AS FOR USINAGEM OF THE SAME ONES

Cano de aço ao carbono elevado tendo usinabilidade a frio superior e indução a capacidade de endurecimento, e método de produção do mesmo

Corrosion-resistant alloy heat transfer tubes for heat-recovery boilers

A corrosion-resistant austenitic alloy suitable for use in heat transfer tubes for heat-recovery boilers which withstands uniform corrosion, intergranular corrosion, and stress corrosion cracking in refuse-fired boilers and black-liquor combustion boilers. The alloy consists essentially, on a weight basis, of C: not more than 0.05%, Si: not more than 4%, Mn: not more than 7.5%, Ni: 25-55%, Cr: more than 20% and not more than 35%, Mo: an amount satisfying the following inequality (1) when Mn(%) Подробнее

Ferritic-austenitic duplex stainless steel

High-strength heat-resisting ferritic steel pipe and tube

A high-strength, heat-resisting ferritic steel pipe or tube for boiler use containing 0.03 to 0.15% C, 0.1 to 1.5% Mn, 8 to 13% Cr, more than 1.5% up to 3.0% W, 0.05 to 0.30% V, 0.02 to 0.12% Nb, 0.02 to 0.05% N, up to 1.0% Mo, and up to 0.25% Si. This pipe or tube has an improved high-temperature creep rupture strength and an excellent weldability and toughness.

ТРУБА ИЗ КОРРОЗИОННО-СТОЙКОЙ МАРТЕНСИТНОЙ СТАЛИ ИСПОСОБ ЕЕ ИЗГОТОВЛЕНИЯ

FIELD: metallurgy. SUBSTANCE: for decreasing the relevant amount of blowhole in clax, created on the pipe surface, and exceeding of resistance to atmosphere corrosion, the pipe is made of steel containing the following mass in %: C (0.15-0.22), Si (0.1-1.0), Mn (0.3-1.0), Cr (12.0-16.0) and it (pipe) has the relevant amount of blowhole in compliance with the thickness of clax from the sideview of the steel pipe, which satisfy the following correlation: ≤-6.69 х ln (ds) + 40.83, where: ds - thickness of the clax (mcm), ln - natural logarithm. The method of producing the pipe includes the pipe heating during 5-30 min up to the temperature (А c3 + 20)°C - 980°C in atmosphere containing oxygen in total amount 2.5 volume.% or less and water vapor in amount of 15.0 volume % or less, the tempering of heated pipe with cooling speed 1-40°C/sec from 980°C up to the point А with cooling speed less then 1°C/sec, from point А till point В and with the cooling speed 5-40°C/sec from point В up to the temperature of environment, where point A lies in the interval 680-350°C and point В - 300-150°C, dispersion of the water under high pressure 490 N/mm 2 or higher to the side surface of the still pipe during that part of cooling from temperature of 900°C up to the point А of mentioned tempering. EFFECT: reduction of the blowholes amount in the clax. 16 cl, 6 tbl, 10 dwg, 1 ex ÐÎÑÑÈÉÑÊÀß ÔÅÄÅÐÀÖÈß RU (19) (11) 2 323 982 (13) C2 (51) ÌÏÊ C21D 9/08 C21D 1/76 (2006.01) (2006.01) ÔÅÄÅÐÀËÜÍÀß ÑËÓÆÁÀ ÏÎ ÈÍÒÅËËÅÊÒÓÀËÜÍÎÉ ÑÎÁÑÒÂÅÍÍÎÑÒÈ, ÏÀÒÅÍÒÀÌ È ÒÎÂÀÐÍÛÌ ÇÍÀÊÀÌ (12) ÎÏÈÑÀÍÈÅ ÈÇÎÁÐÅÒÅÍÈß Ê ÏÀÒÅÍÒÓ (21), (22) Çà âêà: 2006115586/02, 07.10.2004 (72) Àâòîð(û): ÒÀÍÈÄÀ Ìóöóìè (JP) (24) Äàòà íà÷àëà îòñ÷åòà ñðîêà äåéñòâè ïàòåíòà: 07.10.2004 (73) Ïàòåíòîîáëàäàòåëü(è): ÑÓÌÈÒÎÌÎ ÌÅÒÀË ÈÍÄÀÑÒÐÈÇ, ËÒÄ. (JP) R U (30) Êîíâåíöèîííûé ïðèîðèòåò: 10.10.2003 JP 2003-352943 (43) Äàòà ïóáëèêàöèè çà âêè: 10.09.2006 (45) Îïóáëèêîâàíî: 10.05.2008 Áþë. ¹ 13 2 3 2 3 9 8 2 (56) Ñïèñîê äîêóìåíòîâ, öèòèðîâàííûõ â îò÷åòå î ...

ТРУБА ИЗ КОРРОЗИОННО-СТОЙКОЙ МАРТЕНСИТНОЙ СТАЛИ ИСПОСОБ ЕЕ ИЗГОТОВЛЕНИЯ

METHOD OF MANUFACTURING GUIDE FOR INTERNAL COMBUSTION ENGINE VALVE AND MATERIAL FOR GUIDE FOR INTERNAL COMBUSTION ENGINE VALVE

DOUBLE LAYER TUBE AND ALLOY COMPOSITIONS THEREFORE

A carbon deposition preventive double-layered tube for handling carbon compounds at not less than 500 DEG C., the double-layered tube comprising: (a) the layer to be exposed to the carbon compounds, constructed from an alloy which is composed of Cr, Ni, and Fe in porportions shown within a triangular region I of an equilibrium diagram (FIG. 1), the region I bounded by a line from a point (A(Cr: 52% by weight, Ni: 48% by weight, Fe: 0% by weight) to a point B(Cr: 28% by weight, Ni: 36% by weight, Fe: 36% by weight), a line from the point B to a point C(Cr: 28% by weight, Ni: 72% by weight, Fe: 0% by weight), and a line from the point C to the point A; and (b) the other layer which is not exposed to the carbon compounds, constructed from an alloy which is composed of Cr, Ni, and Fe in proportions shown within a pentagonal region II of the equilibrium diagram, the region II bounded by a line from the point B to the point C, a line from the point C to a point F(Cr: 0% by weight, Ni: 100% by ...

APPARATUS FOR HEAT TREATING AN INTERNAL BORE IN A WORKPIECE

... 1507205 Heat treatment of metals by lasers CATERPILLAR TRACTOR CO 30 April 1975 [12 July 19741 41788/77 Divided out of 1507203 Heading C7N A laser beam 18 is focussed on to the bore surface 16 of a workpiece by a series of mirrors contained in a rotatable housing 140. Mirrors 154, 156 are arcuate, and mirror 158 is flat to produce an elongate pattern 94. The mirror 158 is oscillated and progressively varied so that on . rotation of housing 140, the pattern 94 moves around and along the bore surface 16.

NITRIDED STEEL TUBES

STEEL COMPOSITIONS FOR SPECIAL APPLICATIONS

Method for producing metallic, non-rotationally symmetrical rings with a constant wall thickness over their circumference

Seamless steel pipe for line pipe and method for its manufacture

Oil country tubular good for expansion in well and manufacturing method thereof

SEAMLESS STEEL PIPE FOR LINE PIPE AND METHOD FOR PRODUCING SAME

Disclosed is a seamless steel pipe for line pipes which has high strength, good toughness and good corrosion resistance even when it is formed thick. This seamless steel pipe for line pipes has a chemical composition consisting of, in mass%, 0.02-0.08% of C, not more than 0.5% of Si, 1.5-3.0% of Mn, 0.001- 0.10% of Al, more than 0.4% and not more than 1.2% of Mo, 0.002-0.015% of N, 0.0002-0.007% of Ca, and the balance of Fe and impurities. In the impurities, P is not more than 0.03%, S is not more than 0.005%, O is not more than 0.005%, and B is less than 0.0005%. The seamless steel pipe for line pipes is also characterized in that the value of Pcm calculated by the formula (1) below is not less than 0.185 and not more than 0.250, and the seamless steel pipe has a metal structure mainly composed of bainite wherein the length of cementite is not more than 20 .mu.m. Pcm = [C] + [Si]/30 + ([Mn] + [Cr] + [Cu])/20 + [Mo]/15 + [V]/10 + 5[B] (1) In the formula, [C], [Si], [Mn], [Cr], [Cu], [Mo ...

ANTI-FRCTION BEARING COMPONENT MANUFACTURE

HIGH-STRENGTH STEEL EXCELLENT IN LOW TEMPERATURE TOUGHNESS AND TOUGHNESS AT WELD HEAT-AFFECTED ZONE, METHOD FOR PRODUCING THE SAME, AND METHOD FOR PRODUCING HIGH-STRENGTH STEEL PIPE

The present invention provides an ultra-high- strength steel pipe excellent in weldability on site and a method for producing the steel pipe by improving the reliability of the low temperature toughness of a steel to which elements to enhance hardenability are added for furthering high-strengthening and also improving toughness at a weld heat affected zone subjected to double or more layer welding and, in the method, the steel is made to consist of a structure composed of bainite and/or martensite by containing prescribed amounts of C, Si, Mn, P, S, Ni, Mo, Nb, Ti, Al and N, and, as occasion demands, one or more of B, V, Cu, Cr, Ca, REM and Mg, and regulating C, Si, Mn, Cr, Ni, Cu, V and Mo, those being elements to enhance hardenability, by a specific relational expression. The diameter of prior austenite grains may be regulated in a prescribed range. The method includes the steps of heating a casting to a temperature not lower than the Ac3 point, hot rolling it, and thereafter cooling ...

METHOD FOR MANUFACTURING BOTTLE MEMBER FOR AIR BAG INFLATOR

A bottle member for an air bag inflator, comprising a pipe body having at its pipe end a diameter reduction part for mounting an initiator and the like, the diameter reduction part having good low-temperature toughness equivalent to a non-diameter reduction part, is manufactured by the following method. A steel pipe having a steel composition comprising C: 0.05 to 0.20%, Si: 0.1 to 1.0%, Mn: 0.10 to 2.0%, Cr: 0.05 to 2.0%, sol. Al: not more than 0.10%, and Ca: 0.0003 to 0.01%, one or two or more optional additive elements selected from Cu: not more than 1.0%, Ni: not more than 1.5%, Mo: not more than 1.0%, V: not more than 0.2%, Nb: not more than 0.1% or Ti: not more than 0.1% with the balance consisting of Fe and impurities including P: not more than 0.025% and S: not more than 0.010% is cold worked. The cold worked steel pipe is cut into a predetermined length. At least one pipe end part of the cut steel pipe is subjected to diameter reduction and is then quenched and tempered.

OIL COUNTRY TUBULAR GOOD FOR EXPANSION IN WELL AND MANUFACTURING METHOD THEREOF

An oil country tubular good for expansion according to the invention is expanded in a well. The oil country tubular good for expansion has a composition containing, in percentage by mass, 0.05% to 0.08% C, at most 0.50% Si, 0.80% to 1.30% Mn, at most 0.030% P, at most 0.020% S, 0.08% to 0.50% Cr, at most 0.01% N, 0.005% to 0.06% Al, at most 0.05% Ti, at most 0.50% Cu, and at most 0.50% Ni, and the balance consisting of Fe and impurities, and a structure having a ferrite ratio of at least 80%. The oil country tubular good for expansion has a yield strength in the range from 276 MPa to 379 MPa and a uniform elongation of at least 16%. Therefore, the oil country tubular good according to the invention has a high pipe expansion characteristic.

HIGH-STRENGTH WELDED STEEL PIPE AND METHOD FOR PRODUCING THE SAME

A high-strength welded steel pipe is obtained by welding a seam weld portion of a steel plate that are formed in a pipe shape. In the high-strength welded steel pipe, a base metal of the steel plate includes, by mass%, C: 0.010% to 0.080%, Si: 0.01% to 0.50%, Mn: 0.50% to 2.00%, S: 0.0001% to 0.0050%, Ti: 0.003% to 0.030%, Mo: 0.05% to 1.00%, B: 0.0003% to 0.0100%, O: 0.0001% to 0.0080%, N: 0.006% to 0.0118%, P: limited to 0.050% or less, Al: limited to 0.008% or less, and the balance of Fe and inevitable impurities, Ceq is 0.30 to 0.53, Pcm is 0.10 to 0.20, [N] - [Ti] / 3.4 is less than 0.003, the average grain size of the prior .gamma. grains in heat affected zones in the steel plate is 250 µm or less, and the prior .gamma. grains include bainite and intragranular bainite.

Laser-Welded Steel Pipe and Method Therefor

STEEL HAVING EXCELLENT OUTER SURFACE SCC RESISTANCE FOR PIPELINE

Steel which has an excellent outer surface SCC resistance for pipelines without deteriorating fundamental requirements as the pipeline material. The surface smoothness of the steel is so controlled as to have a centerline average roughness Ra 7 .mu.m and have a maximum height Rmax 50 .mu.m. This surface smoothness is obtained by applying shot-blast to the surface. ...

CAGE FOR JOINT HAS CONSTANT SPEED AND PROCESS FOR SA MANUFACTURE

COMPOSITIONS Of STEELS FOR SPECIAL USES

MANUFACTORING PROCESS OF STEEL TUBES HAS DUCTILITY RAISED At low temperature

Improvements brought to the metal articles frayed such as dental needles, hypodermic needles, etc

BEND PIPE AND PROCESS FOR MANUFACTURING THE SAME

A bend pipe that realizes not only simultaneous possession of high strength and excellent toughness by its base metal but also possession of excellent toughness by its weld metal, for example, API Standard X100-grade or higher. A thick steel sheet is produced by hot rolling followed by, at 700° to 500°C, cooling at a cooling rate of less than 5°C/sec at its central part in the direction of thickness. A bend stock pipe being a weld steel pipe using the above thick steel sheet as a raw material is produced, heated to 900° to 1100°C, and subjected to bend working. The resultant pipe at 700° to 500°C is cooled at a cooling rate of 5°C/sec or higher at its central part in the direction of thickness to a temperature zone of 300°C or below. Thereafter, tempering at 300° to 500°C is carried out to thereby attain production of a bend pipe of API Standard X100-grade equivalent or higher. COPYRIGHT KIPO & WIPO 2010 ...

tubo de aÇo sem costura para tubo de linha e processo para sua produÇço

Power transmission shaft

A power transmission shaft having an improved strength and ensuring a stable torsion fatigue strength. The power transmission shaft has coupling members respectively provided on the opposite ends of an pipe part made of a steel material. The steel material includes 0.30-0.45% by weight of C, 0.05-0.35% by weight of Si, 1.0-2.0% by weight of Mn, 0.05% by weight or less of Al, 0.01% by weight or less of S, and the remainder (iron Fe and unavoidable impurities). The pipe part has an electro-unite portion that extends in the axial direction. The electro-unite portion and neighborhood thereof are hardened so as to have a Rockwell hardness HRC of 45 or more. Also, another power transmission shaft has coupling members integrally formed on opposite ends thereof. In addition, the shaft is formed from a steel element tube by a plastic working. The shaft has an inner diametrical surface which is subjected to a high-frequency induction hardening and tempering treatment to make the surface portion hardness ...

Martensitic stainless steel welded pipe

This invention relates to a large-diameter, thick-wall martensitic stainless steel welded pipe. For this welded pipe, the size of the raised weld bead portion on the inside surface is restricted to be small based on a conditional formula derived by considering the bead width and height and the yield strength of the base metal and of the weld metal. As a result, the base metal portion and pipe inside surface seam portion of this welded pipe are superior in corrosion resistance, in particular stress corrosion cracking resistance (SCC resistance). The sulfide stress corrosion resistance (sour gas resistance) and carbon dioxide corrosion resistance can be further improved by selecting the chemical compositions. This welded pipe is very well suited for use as a pipe for a pipeline for conveying a crude oil and a natural gas with no dehydration treatment, which is highly corrosive to metals.

STEEL PIPE FOR BEARING ELEMENTS, AND METHODS FOR PRODUCING AND CUTTING THE SAME

ТРУБА ИЗ НЕРЖАВЕЮЩЕЙ АУСТЕНИТНОЙ СТАЛИ С ОТЛИЧНОЙ СТОЙКОСТЬЮ К ОКИСЛЕНИЮ ПАРОМ И СПОСОБ ЕЕ ПОЛУЧЕНИЯ

FIELD: metallurgy. SUBSTANCE: invention refers to metallurgy, and namely to a pipe from austenitic stainless steel. The pipe is made from steel containing the following, wt %: 14 to 28% Cr and 6 to 30% Ni. Inner pipe surface is subject to cold deformation so that an area with a disordered orientation of adjacent crystals is formed in pipe metal structure at the depth of 5 to 20 mcm from its inner surface, which meets the following expression: g ≥ 0.3, g=(α/β)×δ/ε×100, where g: volumetric ratio of subgrains in the area with disordered orientation of adjacent crystals, which is 5 to 50 degrees, (%); α: sum of the number of pixels on a digital image in the area with disordered orientation of adjacent crystals on a directivity pattern of back scattering of electrons, which is 5 to 50 degrees; β: total number of pixels on a digital image in the measurement area at use of the directivity pattern of back scattering of electrons; ε: width of a pitch at analysis of a directivity pattern of back scattering of electrons (mcm); δ: width of inter-grain boundary (mcm). EFFECT: steel pipe has high stability to oxidation with water vapour, including at temperatures close to 700°C. 4 cl, 2 tbl, 1 ex РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 511 158 C2 (51) МПК C22C 38/40 (2006.01) C21D 7/06 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ (21)(22) Заявка: ИЗОБРЕТЕНИЯ К ПАТЕНТУ 2012130960/02, 19.05.2011 (24) Дата начала отсчета срока действия патента: 19.05.2011 Приоритет(ы): (30) Конвенционный приоритет: (43) Дата публикации заявки: 27.01.2014 Бюл. № 3 (73) Патентообладатель(и): СУМИТОМО МЕТАЛ ИНДАСТРИЗ, ЛТД. (JP) R U 09.06.2010 JP 2010-131613 (72) Автор(ы): НИСИЯМА, Йоситака (JP), ЙОСИДЗАВА, Мицуру (JP), СЕТО, Масахиро (JP), ТАНАКА, Кацуки (JP) (45) Опубликовано: 10.04.2014 Бюл. № 10 C1, 10.03.1998. RU 2153421 C2, 27.07.2000. JP 2009-068079 A, 02.04.2009. JP 2004-132437 A, 30.04.2004 (85) Дата начала рассмотрения заявки PCT на национальной фазе: 19.07. ...

КОЛЕНЧАТАЯ ТРУБА И СПОСОБ ЕЕ ИЗГОТОВЛЕНИЯ

FIELD: machine building. ^ SUBSTANCE: steel sheet is used for fabrication of bent pipe out of base metal of high strength and impact resistance and with metal of weld seam of high resilience. The sheet is fabricated by cooling upon hot rolling at rate of cooling in the central part in the direction of sheet thickness maximum 5C/s at 700-500C; the sheet is formed as a primary pipe. The primary pipe is heated to 900-1100C and bent. Further, it is cooled to temperature maximum 300C with rate of cooling in the central part in the direction of thickness minimum 5C per second at 700-500C upon which it is tempered at 300-500C. ^ EFFECT: increased operational reliability. ^ 11 cl, 1 ex, 5 tbl, 5 dwg

СТАЛЬНАЯ ТРУБКА В КАЧЕСТВЕ ТОПЛИВОПРОВОДА ВЫСОКОГО ДАВЛЕНИЯ

... 1. Стальная трубка в качестве топливопровода высокого давления с прочностью на растяжение 500 Н/мм2 или более, содержащая, по массе, С от 0,12 до 0,27%, Si от 0,05 до 0,40%, и Mn от 0,8 до 2,0%, и остальное Fe и примеси, с содержанием Ca, P, и S в примесях, составляющим Са 0,001% или менее, Р 0,02% или менее, и S 0,01% или менее соответственно, отличающаяся тем, что максимальный диаметр неметаллических включений, присутствующих, по меньшей мере, в зоне, расположенной до глубины 20 мкм от внутренней поверхности стальной трубки, составляет 20 мкм или менее. ! 2. Стальная трубка по п.1, дополнительно содержащая, вместо части Fe, по меньшей мере, один элемент, выбранный из Cr 1% или менее, Mo 1% или менее, Ti 0,04% или менее, Nb 0,04% или менее, и V 0,1% или менее.

Verfahren zur Infiltration eines rohrförmigen Elements.

Heat-treating tubular steel sections

A tubular steel section at a temperature, above Ac1, at which the steel contains at most 15% ferrite is subjected to martensitic and/or bainitic quenching followed by still air cooling. The effects of quenching are limited to a surface layer, internal and/or external, of the section. At the end of the quenching step the part of the section remote from the quenched surface layer or layers is at a temperature above 675 DEG C. which permits self-tempering of the quenched surface layer or layers at a temperature above 450 DEG C. and ensures transformation of residual austenite to a martensite-free structure.

SPOOL AND PROCEDURE FOR ITS PRODUCTION

PROCEDURE FOR THE INFILTRATION OF A TUBULAR ELEMENT.

MARTENSITIC STAINLESS STEEL TUBE AND MANUFACTURING METHOD THEREOF

STRENGTHENED METAL PIPE AND PROCESS FOR MAKING SAME

Metal pipe or tubing having increased strength and toughness in a direction transverse to its axis, designed to prevent fractures and inhibit fracture propagation, for example in pipelines carrying fluids such as natural gas or oil. The pipes have localized sections spaced from their ends which have been toughened and strengthened by heat treating or some other known method of toughening and strengthening to a yield strength in excess of 60,000 p.s.i. The heat treating process requires subjecting the localized sections of the pipes to heat them, through their entire wall thickness, to the austenitizing temperature, after which the relevant sections are quenched using a liquid or gaseous quenching medium. The sections are then tempered to provide the desired degree of strength and toughness. These lengths of pip may be welded in a conventional manner.

PIPES RESISTANT TO HYDROSULFURIC ACID

ABSTRACT TITLE: "PIPES RESISTANT TO HYDROSULPHURIC ACID" High-strength pipes are manufactured from cold-deformed carbon steel or alloyed steel for use in acid environment, in which the H2S partial pressure in gaseous phase may exceed 300 Pa or in which the H2S content in liquid phase may have a corresponding equilibrium pressure and/or in which C02 and other acidifying substances may be present. the weight % composition of the steel is preferably: C 0 - 1.20 % Si 0 - 1.0 % Mn 0 - 3.0 % Cr 0 - 2.0 % Ni 0 - 1.0 % Mo 0 - 1.0 % Cu 0 - 1.0 % V 0 - 0.3 % Nb 0 - 0.2 % Ca 0 - 0.05 % Fe + incidental ingredients and impurities up to 100% .

HIGH PRESSURE FUEL INJECTION TUBING MATERIAL AND METHOD OF MANUFACTURING THE SAME

STEEL TUBE

HIGH STRENGTH LINE PIPE STEEL HAVING LOW YIELD RATIO AND EXCELLENT LOW TEMPERATURE TOUGHNESS

This invention provides an ultra-high strength low yield ratio line pipe steel which is excellent in HAZ toughness and field weldability and has a tensile strength of at least 950 MPa (exceeding x100 of the API standard). The steel is of a low carbon-high Mn-Ni-Mo-Nb-trace Ti type selectively containing B, Cu, Cr and V, whenever necessary, its micro-structure comprises a martensite/bainite and ferrite soft/hard two-phase mixed structure having a ferrite fraction of 20 to 90%, this ferrite contains 50 to 100% of worked ferrite, and the ferrite grain size is not greater than 5 .mu.m. The production of an ultra-high strength low yield ratio line pipe steel (exceeding x100) excellent in low temperature toughness and field weldability becomes possible. As a result, the safety of a pipeline can be remarkably improved, and execution efficiency and transportation efficiency of the pipeline can be drastically improved.

AUTOMOBILE BODY REINFORCING STEEL PIPE AND PROCESS FOR PRODUCING SAME

AUTOMOBILE BODY REINFORCING STEEL PIPE AND PROCESS FOR PRODUCING SAME

An automobile body reinforcing steel pipe having a wall thickness-to-outer diameter ratio, t/D, defined by: 0.09 - 4.8 x 10-5 x L ? t/D ? 0.16 - 6.0 x 10-5 x L where L(mm) is a span of a bending load applied to the pipe. The pipe has a tensile strength of 120 kgf/mm2 or more and an elongation of 10% or more, and is preferably made of a steel consisting of 0.15 - 0.25 wt% C, 1.8 wt% or less Mn, 0.5 wt% or less Si, 0.04 wt% or less Ti, 0.0003 - 0.0035 wt% B, and the balance of Fe and unavoidable impurities including 0.0080 wt% or less N. A process for producing the steel pipe comprises: coiling a hot rolled steel sheet at a temperature of 600.degree.C or higher; electric welding the adjoining edges of the sheet to form a steel pipe; and quench hardening the pipe.

成形性优良的钢管及制造这种钢管的方法

... 一种具有良好成形性的钢管，其特征是它包括，以质量百分数计：0.0005-0.30％的C，0.001-2.0％的Si和0.01-3.0％的Mn，以及可供选择地含有特定量的特定元素，余量为Fe和不可避免的杂质，并且相对于在钢板的1/2板厚度位置处的板平面，取向群{110}<110>-{111}<110>的平均X射线随机强度比为≥2.0和/或{110}<110>的X射线随机强度比为≥3.0。钢管具有高强度并在液压成形法和其它成形法中显示出良好的成形性。 ...

TUBE STEEL EQUIPPED With a HARDENED LAYER ON AT LEAST ONE OF ITS SURFACES

INVENTION CONCERNANT LA METALLURGIE DE L'ACIER. TUBE D'ACIER DE PETIT DIAMETRE EXTERIEUR ET DE GROSSE EPAISSEUR DE PAROI AYANT UNE COUCHE DURCIE SUR SA SURFACE INTERNE AU MOINS. CETTE DERNIERE EST FORMEE D'UNE SOLUTION SOLIDE D'AZOTE EXEMPTE DE COMPOSES INTERMETALLIQUES FEN ET FEN. L'INVENTION ENGLOBE AUSSI UN PROCEDE DE FABRICATION COMPRENANT LE TRAITEMENT D'UN TUBE D'ACIER VIBRANT AXIALEMENT, DANS UN BAIN DE CYANURE DE SODIUM FONDU, POUR FORMER UNE COUCHE DE DIFFUSION A PARTIR DE LAQUELLE LES COMPOSES INTERMETALLIQUES SONT DECOMPOSES ET ELIMINES EN TRAITANT LE TUBE DANS UNE ATMOSPHERE GAZEUSE CHAUDE. APPLICATION A LA FABRICATION DES TUBES D'INJECTION DE CARBURANT SOUS PRESSION POUR MOTEURS DIESEL. INVENTION CONCERNING THE METALLURGY OF STEEL. SMALL OUTSIDE DIAMETER STEEL TUBE OF LARGE WALL THICKNESS HAVING A HARDENED LAYER ON AT LEAST ITS INTERNAL SURFACE. THE LATTER IS FORMED BY A SOLID NITROGEN SOLUTION FREE OF FEN AND FEN INTERMETALLIC COMPOUNDS. THE INVENTION ALSO INVOLVES A MANUFACTURING PROCESS INCLUDING THE TREATMENT OF AN AXIALLY VIBRATING STEEL TUBE, IN A BATH OF MELTED SODIUM CYANIDE, TO FORM A DIFFUSION LAYER FROM WHICH THE INTERMETALLIC COMPOUNDS ARE DECOMPOSED AND REMOVED IN THE PROCESSING THE TUBE IN A HOT GASEOUS ATMOSPHERE. APPLICATION TO THE MANUFACTURE OF PRESSURIZED FUEL INJECTION TUBES FOR DIESEL ENGINES.

TUBES RESISTANT A L'ACIDE SULFHYDRIQUE

L'INVENTION CONCERNE DES TUBES A GRANDE RESISTANCE A L'ACIDE SULFHYDRIQUE. CES TUBES A GRANDE RESISTANCE DESTINES A L'UTILISATION DANS UN ENVIRONNEMENT ACIDE DANS LEQUEL LA PRESSION PARTIELLE D'ACIDE SULFHYDRIQUE EN PHASE GAZEUSE PEUT DEPASSER 300PA OU LA TENEUR EN ACIDE SULFHYDRIQUE EN PHASE LIQUIDE PEUT AVOIR UNE PRESSION D'EQUILIBRE CORRESPONDANTE ETOU DE L'ANHYDRIDE CARBONIQUE OU MEME D'AUTRES SUBSTANCES ACIDIFIANTES PEUVENT ETRE PRESENTES, SONT FABRIQUES A PARTIR D'ACIER AU CARBONE OU D'ACIER ALLIE DEFORME A FROID: C, 0 - 1,20; SI, 0 - 1,0; MN, 0 - 3,0; CR, 0 - 2,0; NI, 0 - 1,0; MO, 0 - 1,0; CU, 0 - 1,0; V, 0 - 0,3; NB, 0 - 0,2; CA, 0 - 0,05; FE, IMPURETES NORMALES JUSQU'A 100.

PERFECTIONNEMENTS AUX PROCEDES DE TRAITEMENT DE PROFILES TUBULAIRES EN ACIER

L'invention concerne un traitement thermique. Le procédé est caractérisé en ce que ledit tube se trouvant à une température à laquelle correspond au plus 15 % de ferrite, est soumis à une trempe martensitique et/ou bainitique, en ce que l'on règle les conditions du refroidissement intense jusqu'à une température inférieure à celle de formation de martensite, de façon d'une part à limiter les effets de la trempe à une couche superficielle du profilé et d'autre part, de telle façon qu'à la sortie de la phase de trempe, la partie du profilé la plus éloignée de la zone trempée se trouve à une température supérieure à 675 degrés C, et en ce qu'après cette phase de revenu, le tube est soumis à un refroidissement à l'air calme. Application aux tubes de toutes sortes obtenus par laminage, extrusion, filage ou autre moyen.

Method of producing a cold temperature high toughness structural steel tubing

An apparatus (10) includes a low-carbon steel tube (24). The low-carbon steel tube (24) yields plastically more than about 5% before fracturing at temperatures down to about −40° C. when stress is applied to the low-carbon steel tube sufficient to cause the low carbon steel tube to so yield.

SEAMLESS STEEL PIPE FOR LINE PIPE AND METHOD FOR PRODUCING SAME

A thick-walled seamless steel pipe for line pipe which has a high strength and improved toughness and corrosion resistance in spite of the thick wall and which is suitable for use as a riser and flow line has a chemical composition comprising, in mass percent, C: 0.02 - 0.08%, Si: at most 0.5%, Mn: 1.5 - 3.0%, Al: 0.001 - 0.10%, Mo: greater than 0.4% - 1.2%, N: 0.002 - 0.015%, at least one of Ca and REM in a total amount of 0.0002 - 0.007%, and a remainder of Fe and impurities, with the impurities having the content of P: at most 0.05%, S: at most 0.005%, and O: at most 0.005%, the chemical composition satisfying the inequality: 0.8 = [Mn] x [Mo] = 2.6, wherein [Mn] and [Mo] are the numbers equivalent to the contents of Mn and Mo, respectively, in mass percent.

Process for making an electric-resistance-welded steel pipe with high strength

СТАЛЬНАЯ ТРУБКА В КАЧЕСТВЕ ТОПЛИВОПРОВОДА ВЫСОКОГО ДАВЛЕНИЯ

FIELD: metallurgy. ^ SUBSTANCE: steel consists in wt %: C: from 0.12 to 0.27, Si: from 0.05 to 0.40 and Mn: from 0.8 to 2.0, the rest is Fe and impurities of Ca, P and S. Contents of Ca are 0.001 % or less, P 0.02 or less and S: 0.01 or less. Steel additionally contains at least one element chosen from Cr: 1 % or less, Mo: 1 % or less, Ti: 0.04% or less, Nb: 0.04 % or less and V: 0.1 % or less. Maximal diametre of non-metallic inclusions present in at least in zone running from internal surface of steel tube to depth of 20 mcm is 20 mcm or less. ^ EFFECT: disclosed steel tube is not subjected to fatigue destruction and possesses increased fatigue life and high reliability due to high strength and high limit of internal pressure. ^ 2 cl, 2 tbl, 1 ex РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) 2 407 819 (13) C2 (51) МПК C22C 38/04 (2006.01) F02M 55/02 (2006.01) F16L 9/02 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ, ПАТЕНТАМ И ТОВАРНЫМ ЗНАКАМ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (21), (22) Заявка: 2008144690/02, 11.04.2007 (24) Дата начала отсчета срока действия патента: 11.04.2007 (43) Дата публикации заявки: 20.05.2010 (56) Список документов, цитированных в отчете о поиске: JP 09-057329 А, 04.03.1997. RU 2167954 C2, 27.05.2001. RU 2152450 C1, 10.07.2000. JP 08309428 A, 26.11.1996. JP 59-179717 A, 12.10.1984. 2 4 0 7 8 1 9 R U (86) Заявка PCT: JP 2007/057949 (11.04.2007) C 2 C 2 (85) Дата перевода заявки PCT на национальную фазу: 13.11.2008 (87) Публикация PCT: WO 2007/119734 (25.10.2007) Адрес для переписки: 129090, Москва, ул.Б.Спасская, 25, стр.3, ООО "Юридическая фирма Городисский и Партнеры", А.В.Мицу (54) СТАЛЬНАЯ ТРУБКА В КАЧЕСТВЕ ТОПЛИВОПРОВОДА ВЫСОКОГО ДАВЛЕНИЯ (57) Реферат: Изобретение относится к области металлургии, а именно к изготовлению стальной трубки, используемой в качестве топливопровода высокого давления. Сталь содержит в мас.%: С: от 0,12 до 0,27, Si: от 0,05 до 0,40, и Mn: от 0,8 до 2,0, остальное составляют Fe и примеси Са, Р и S. ...

ВЫСОКОПРОЧНАЯ СТАЛЬ С ПРЕВОСХОДНОЙ ВЯЗКОСТЬЮ ПРИ НИЗКИХ ТЕМПЕРАТУРАХ И ПРЕВОСХОДНОЙ ВЯЗКОСТЬЮ В ЗОНЕ ТЕРМИЧЕСКОГО ВЛИЯНИЯ СВАРНОГО ШВА(ВАРИАНТЫ), СПОСОБ ПОЛУЧЕНИЯ ТАКОЙ СТАЛИ...

... 1. Высокопрочная сталь с превосходной вязкостью при низких температурах и превосходной вязкостью в зоне термического влияния сварного шва, отличающаяся тем, что содержит, по массе: С: 0,02-0,10%, Si: не более 0,6%, Мn: 1,5-2,5%, Р: не более 0,015%, S: не более 0,003%, Ni: 0,01-2,0%, Мо: 0,2-0,6%, Nb: менее 0,010%, Ti: не более 0,030%, Аl: не более 0,070%, и N: не более 0,0060%, остальное - Fe и неизбежные примеси, при этом параметр Р в стали, определяемый нижеследующим выражением, находится в диапазоне от 1,9 до 3,5, а микроструктура стали состоит в основном из мартенсита и бейнита: Р=2,7С+0,4Si+Мn+0,8Сr+0,45(Ni+Сu)+2V+Мo-0,5. 2. Высокопрочная сталь с превосходной вязкостью при низких температурах и превосходной вязкостью в зоне термического влияния сварного шва, отличающаяся тем, что содержит, по массе: С: 0,02-0,10%, Si: не более 0,6%, Мn: 1,5-2,5%, Р: не более 0,015%, S: не более 0,003%, Ni: 0,01-2,0%, Мо: 0,1-0,6%, Nb: менее 0,010%, Ti: не более 0,030%, В: 0,0003-0,0030%, и Al: не более ...

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

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).

High-strength welded steel pipe and method of its production

FIELD: metallurgy. SUBSTANCE: steel sheet parent metal comprises the following components, in wt %: 0.010-0.080%, Si: 0.01-0.50%, Mn: 0.50-2.00%, S: 0.0001-0.0050%, Ti: 0.003-0.030%, Mo: 0.05-1.00%, B: 0.0003-0.0100%, O: 0.0001-0.0080%, N: 0.006-0.,0118%, P: at least 0,050% or smaller, Al: at least 0.008% or smaller, Fe and unavoidable impurities making the rest. Carbon equivalent (Ceq) makes 0.30 to 0.53, crack growth resistance in welding (Pcm) makes 0.10 to 0.20, while [N]-[Ti]/3.4 does not exceed 0.003. Mean size of primary γ-grains in thermal effects zone in steel sheet makes 250 mcm or smaller, while primary γ-grains include bainite and intragranular bainite. EFFECT: sufficient low-temperature toughness. 9 cl, 3 dwg, 2 tbl, 1 ex РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) 2 509 171 (13) C1 (51) МПК C22C 38/14 B21C 37/08 (2006.01) (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (21)(22) Заявка: 2012132957/02, 04.02.2011 (24) Дата начала отсчета срока действия патента: 04.02.2011 (73) Патентообладатель(и): НИППОН СТИЛ КОРПОРЕЙШН (JP) (45) Опубликовано: 10.03.2014 Бюл. № 7 2 5 0 9 1 7 1 (56) Список документов, цитированных в отчете о поиске: JP 2003-064449 A, 05.03.2003. RU 2208747 C2, 20.07.2003. RU 2205246 C2, 27.05.2003. RU 2152450 C1, 10.07.2000. JP 2005-290526 A, 20.10.2005. JP 11-172374 A, 29.06.1999. (85) Дата начала рассмотрения заявки PCT на национальной фазе: 04.09.2012 2 5 0 9 1 7 1 R U (87) Публикация заявки РСТ: WO 2011/096510 (11.08.2011) C 1 C 1 (86) Заявка PCT: JP 2011/052348 (04.02.2011) Адрес для переписки: 129090, Москва, ул. Б. Спасская, 25, стр.3, ООО "Юридическая фирма Городисский и Партнеры" (54) ВЫСОКОПРОЧНАЯ СВАРНАЯ СТАЛЬНАЯ ТРУБА И СПОСОБ ЕЕ ПОЛУЧЕНИЯ (57) Реферат: Изобретение относится к области металлургии, а именно к получению высокопрочной сварной стальной трубы путем шовной сварки участка стального листа, которому придана форма трубы. Основной металл стального листа включает, в мас.%, C: 0, ...

Material for high pressure fuel injection pipe and manufacture thereof

Thick-wall welded steel pipe with excellent low-temperature impact strength, manufacturing method of thick-wall welded steel pipe with excellent low-temperature impact strength, and steel plate for production of thick-wall welded steel pipe

FIELD: metallurgy. SUBSTANCE: pipe is made from a parent material of a steel plate folded into a pipe-shaped form and welded by seam welding so that a weld and a large-grained heat-affected zone (HAZ) are formed. The parent material of the steel plate has the following chemical composition, wt %: C 0.03 to 0.085, Mn 1.45 to 1.85, Ti 0.005 to 0.020, Nb 0.005 to 0.050, O 0.0005 to 0.005, Si 0.15 or less, Al 0.015 or less, P 0.02 or less, S 0.005 or less, Mo 0.20 or less, Fe and inevitable impurities are the rest. The structure of metal of the parent material of the steel plate consists of ferrite with a fraction of the area of 30 to 95%, martensite, bainite and martensitic-austenitic component (MA) is the rest, and for the metal structure of the large-grained HAZ the fraction of the area of the grain boundary ferrite is 1.5% or more, the total fraction of the area of the grain boundary ferrite and intragranular ferrite is at least 11%, but not more than 90%, the fraction of the MA area is 10% or less, and bainite is the rest. EFFECT: improvement of characteristics. 13 cl, 10 dwg, 4 tbl, 1 ex РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 534 566 C1 (51) МПК C22C 38/14 (2006.01) C21D 8/02 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ (21)(22) Заявка: ИЗОБРЕТЕНИЯ К ПАТЕНТУ 2013116583/02, 13.09.2011 (24) Дата начала отсчета срока действия патента: 13.09.2011 Приоритет(ы): (30) Конвенционный приоритет: (72) Автор(ы): СИНОХАРА,Ясухиро (JP), ХАРА,Такуя (JP), ДОИ,Наоки (JP), ЯМАСИТА,Еиити (JP) (45) Опубликовано: 27.11.2014 Бюл. № 33 2136776 C1, 10.09.1999. RU 2135622 C1, 27.08.1999. RU 2393238 C1, 27.06.2010. WO 2008069335 A1, 12.06.2008. JP 2005-336602 A, 08.12.2005. JP 2010-126730 A, 10.06.2010 (85) Дата начала рассмотрения заявки PCT на национальной фазе: 15.04.2013 (86) Заявка PCT: 2 5 3 4 5 6 6 (56) Список документов, цитированных в отчете о поиске: WO 2008069289 A1, 12.06.2008. RU R U (73) Патентообладатель(и): НИППОН СТИЛ ЭНД СУМИТОМО МЕТАЛ ...

High strength stainless steel seamless steel pipe for oil well with excellent corrosion resistance and method for producing the same

Steel pipe having excellent formability and method for production thereof

본 발명은, 질량%로, C: 0.0005 내지 0.30%, Si: 0.001 내지 2.0%, Mn: 0.01 내지 3.0%, 필요에 따라서 적당한 양의 기타 다른 성분, 그리고 철 및 불가피한 불순물로 이루어진 잔부를 함유하고, 강판의 벽 두께 중심부에 있는 판면의 랜덤 X선 회절 강도에 대한 {110}<110>∼{111}<110> 방위 성분군의 X선 강도의 비의 평균이 2.0 이상이고, 강판의 벽 두께 중심부에 있는 판면의 랜덤 X선 회절 강도에 대한 {110}<110> 방위 성분의 X선 강도의 비가 3.0 이상인 것을 특징으로 하는, 액압성형 등의 성형방법에서 성형성이 우수한 고강도 강관에 관한 것이다. The present invention, in mass%, contains C: 0.0005 to 0.30%, Si: 0.001 to 2.0%, Mn: 0.01 to 3.0%, other components in an appropriate amount as necessary, and a balance composed of iron and unavoidable impurities. And the average of the ratio of the X-ray intensity of the {110} <110>-{111} <110> orientation component group to the random X-ray diffraction intensity of the plate surface in the center of the wall thickness of the steel plate is 2.0 or more, and the wall thickness of the steel plate The ratio of the X-ray intensity of the {110} <110> azimuth component to the random X-ray diffraction intensity of the plate surface in the center is 3.0 or more.

High strength welded steelpipe and manufacture method thereof

本发明提供一种高强度焊接钢管，其中，对成形为管状的钢板的对接部进行焊接，所述钢板的母材部以质量%计，含有C：0.010～0.080%、Si：0.01～0.50%、Mn：0.50～2.00%、S：0.0001～0.0050%、Ti：0.003～0.030%、Mo：0.05～1.00%、B：0.0003～0.0100%、O：0.0001～0.0080%、N：0.006～0.0118%，剩余部分包括铁和不可避免的杂质，将以下元素限制在P：0.050%以下、Al：0.008%以下，Ceq为0.30～0.53，Pcm为0.10～0.20，[N]－[Ti]/3.4低于0.003，所述钢板的焊接热影响区的原γ晶粒的平均晶体粒径为250μm以下，在所述原γ晶粒内含有贝氏体和晶内贝氏体。

Linepipe and structural steel produced by high speed continuous casting

A high strength, high toughness, low carbon/low manganese steel is provided that is further resistant to stepwise cracking and sulfide stress cracking. The steel can be produced by conventional or thin slab casting techniques using normal speeds, with low manganese segregation levels. The steels are excellent candidates for linepipe applications in severe sour gas service.

Steel for oil well pipes with high wet carbon dioxide gas corrosion resistance and high seawater corrosion resistance, and seamless oil well pipe

Steel for oil well pipes with a high local corrosion resistance in a CO2 environment and a high seawater corrosion resistance, and a seamless oil well pipe produced from the same steel, wherein this steel comprises more than 0.10 % and up to 0.30 % of C, 0.10 % - 1.0 % of Si, 0.1 % - 3.0 % of Mn, 2.0 % - 9.0 % of Cr, 0.01 % - 0.10 % of Al, or 0.05 % - 0.5 % of Cu in addition thereto, and Fe and unavoidable impurities for the remainder, the content of P of the impurities being not more than 0.03 %, and S not more than 0.01 %, a microstructure of the steel as quenched or normalized being substantially a single phase of martensite, the steel subjected to a heat treatment, such as quenching-tempering or normalization-tempering having a proof stress of not lower than 552 MPa.

Steel pipe having excellent formability and method for production thereof

Steel pipe having high formability and method for producing the same

Austenitic alloy pipe with superior hot steam oxidation resistance

High-strength welded steel pipe and method for producing the same

本发明提供一种高强度焊接钢管，其中，对成形为管状的钢板的对接部进行焊接，所述钢板的母材部以质量%计，含有C：0.010～0.080%、Si：0.01～0.50%、Mn：0.50～2.00%、S：0.0001～0.0050%、Ti：0.003～0.030%、Mo：0.05～1.00%、B：0.0003～0.0100%、O：0.0001～0.0080%、N：0.006～0.0118%，剩余部分包括铁和不可避免的杂质，将以下元素限制在P：0.050%以下、Al：0.008%以下，Ceq为0.30～0.53，Pcm为0.10～0.20，[N]－[Ti]/3.4低于0.003，所述钢板的焊接热影响区的原γ晶粒的平均晶体粒径为250μm以下，在所述原γ晶粒内含有贝氏体和晶内贝氏体。

Maraging type spring steel

The invention relates to a high-strength, age-hardenable, corrosion-resistant maraging type spring steel, which is essentially comprised of 6.0 to 9.0 wt. % of Ni, 11.0 to 15.0 wt. % of Cr, 0.1 to 0.3 wt. % of Ti, 0.2 to 0.3 wt. % of Be and of a remainder consisting of Fe, whose martensite temperature M s ≧130° C. and which has a ferrite content c ferrite of less than 3%.

High-strength steel having excellent low-temperature viscosity and excellent viscosity in thermally affected zone of welding joint (options), method for manufacturing such steel, method for manufacturing sheet from indicated steel, high-strength steel tube (option), and a method for manufacturing high-strength steel tube

Изобретение относится к стали, используемой в сварных конструкциях, например в газопроводах, в нефтепроводах, а также в сосудах высокого давления. Высокопрочная сталь с превосходной вязкостью при низких температурах и превосходной вязкостью в зоне термического влияния сварного шва содержит компоненты в следующем соотношении, мас.%: С 0,02-0,10; Si не более 0,6; Mn 1,5-2,5; Р не более 0,015; S не более 0,003; Ni 0,01-2,0; Мо 0,2-0,6; Nb менее 0,010; Ti не более 0,030; Al не более 0,070; N не более 0,0060; Fe и неизбежные примеси - остальное. При этом P=2,7C+0,4Si+Mn+0,8Cr+0,45(Ni+Cu)+2V+Mo-0,5. Параметр Р находится в диапазоне от 1,9 до 3,5. Микроструктура стали состоит в основном из мартенсита и бейнита. Способ изготовления листа из данной стали включает нагрев отливки не меньше, чем до Ас 3 , горячую прокатку и охлаждение со скоростью не менее 1°С/сек до температуры не более 550°С. Из листа изготавливают трубу. Техническим результатом изобретения является получение стали с пределом прочности на растяжение не менее 800 МПа. При наложении многослойного сварного шва энергия, поглощаемая при испытании на удар по Шарпи при минус 40°С, составляет не менее 200 Дж. 10 н. и 11 з.п. ф-лы, 1 ил., 9 табл. ÐÎÑÑÈÉÑÊÀß ÔÅÄÅÐÀÖÈß (19) RU (51) ÌÏÊ 7 (11) 2 258 762 (13) C2 C 22 C 38/14, 38/58, C 21 D 8/02, 8/10 ÔÅÄÅÐÀËÜÍÀß ÑËÓÆÁÀ ÏÎ ÈÍÒÅËËÅÊÒÓÀËÜÍÎÉ ÑÎÁÑÒÂÅÍÍÎÑÒÈ, ÏÀÒÅÍÒÀÌ È ÒÎÂÀÐÍÛÌ ÇÍÀÊÀÌ (12) ÎÏÈÑÀÍÈÅ ÈÇÎÁÐÅÒÅÍÈß Ê ÏÀÒÅÍÒÓ (21), (22) Çà âêà: 2003115595/02, 26.05.2003 (72) Àâòîð(û): ÕÀÐÀ Òàêó (JP), ÀÑÀÕÈ Õèòîñè (JP) (24) Äàòà íà÷àëà äåéñòâè ïàòåíòà: 26.05.2003 (73) Ïàòåíòîîáëàäàòåëü(ëè): ÍÈÏÏÎÍ ÑÒÈË ÊÎÐÏÎÐÅÉØÍ (JP) R U (30) Ïðèîðèòåò: 27.05.2002 (ïï.1-6, 9, 10) JP 2002152379 26.12.2002 (ïï.7, 8, 11-21) JP 2002377829 (43) Äàòà ïóáëèêàöèè çà âêè: 10.01.2005 2 2 5 8 7 6 2 (45) Îïóáëèêîâàíî: 20.08.2005 Áþë. ¹ 23 (56) Ñïèñîê äîêóìåíòîâ, öèòèðîâàííûõ â îò÷åòå î ïîèñêå: ÅÐ 0757113 À1, 05.02.1997. JP 09165620 À, 24.06.1997. JP 09-165621 A, 24.06.1997. ÅÐ 0861915 À1, 02.09.1998. WO 99/ ...

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

Thick welded steel pipe having excellent low-temperature toughness, method for producing thick welded steel pipe having excellent low-temperature toughness, and steel sheet for producing thick welded steel pipe

본 발명은, 저온 인성이 우수한 후육 용접 강관을 제공하는 것이다. 본 발명의 저온 인성이 우수한 후육 용접 강관은, Mn 및 Mo의 함유량이 하기 수학식 1을 만족시키고, 하기 수학식 2에 의해 구하는 Pcm이 0.16 내지 0.19이고, 모재 강판의 금속 조직이, 면적률로 30 내지 95％의 페라이트와 저온 변태 조직으로 이루어지고, 조립 HAZ의 금속 조직에 있어서, 입계 페라이트의 면적률이 1.5％ 이상이고, 입계 페라이트와 입내 페라이트의 총 면적률이 25％ 이상 90％ 이하이고, MA의 면적률이 10％ 이하이고, 잔량부가 베이나이트로 이루어지는 후육 용접 강관이다. [수학식 1] [수학식 2] The present invention provides a welded welded steel pipe excellent in low temperature toughness. The welded core steel pipe excellent in low-temperature toughness according to the present invention is characterized in that the content of Mn and Mo satisfies the following formula (1) and the Pcm obtained by the following formula (2) is 0.16 to 0.19, Wherein the area ratio of intergranular ferrite is 1.5% or more and the total area ratio of intergranular ferrite to intergranular ferrite is 25% or more and 90% or less in the metal structure of the assembled HAZ , The area ratio of MA is 10% or less, and the remaining portion is made of bainite. [Equation 1] &Quot; (2) &quot;

High-toughness seam welded tube having excellent sour resistance

(57)【要約】本公報は電子出願前の出願データであるた め要約のデータは記録されません。

High-strength welded steel pipe and method for producing the same

Martensitic stainless steel products

Oil country tubular goods excellent in collapse characteristics after expansion and method of production thereof

The present invention provides a method of production of oil country tubular goods having a small drop in collapse pressure after expansion and having a collapse pressure recovering by low temperature ageing at about 100°C and oil country tubular goods obtained by this method of production. This method of production comprises hot rolling a steel slab having amounts of addition of C, Mn, P, S, Nb, Ti, Al, and N in specific ranges and having a balance of iron and unavoidable impurities and shaping the steel strip coiled at a temperature of not more than 300°C as it is into a tube. Alternatively, it comprises heating steel pipe having amounts of addition of C, Mn, P, S, Nb, Ti, Al, and N in specific ranges and having a balance of iron and unavoidable impurities to a temperature of the Ac3 [°C] to 1150°C, then cooling it in a range of 400 to 800°C at a rate of 5 to 50°C/second.

Patent FR2405998B1

PROCESS FOR THERMAL TREATMENT OF OBTAINED TUBES AND TUBES

Procédé de traitement thermique de tubes métalliques, notamment d'acier dans lequel on empile les tubes dans un four. On réalise une ou plusieurs bottes de tubes régulièrement empilés et maintenus contre tout jeu latéral en étant rectilignes, de préférence sous forme de bottes hexagonales. L'invention est applicable notamment aux tubes minces et très longs. Process for the heat treatment of metal tubes, in particular steel in which the tubes are stacked in an oven. One or more bundles of regularly stacked tubes are made and held against any lateral play by being rectilinear, preferably in the form of hexagonal bundles. The invention is particularly applicable to thin and very long tubes.

STEEL TUBE HAVING A HARDENED LAYER ON AT LEAST ONE OF ITS SURFACES

Spring with improved corrosion fatigue resistance

Feder, dadurch gekennzeichnet, daß als Werkstoff ein Stahl zur Verwendung kommt, welcher umfaßt: 0,35 bis 0,55 % C, 1,60 bis 3,00 % Si, 0,20 bis 1,50 % Mn, 0,010 % oder weniger S, 0,40 bis 3,00 % Ni, 0,10 bis 1,50 % Cr, 0,010 bis 0,025 % N, 0,05 bis 0,50 % V und Rest Fe; daß eine Wärmebehandlung auf Erhalt einer Härte von 50,5 bis 55,0 HRC durchgeführt wurde; und daß eine Kugelstrahlbehandlung bei mäßigen Temperaturen auf Erhalt einer Restspannung von –600 MPa oder mehr in einer Tiefe von 0,2 mm unter der Oberfläche durchgeführt wurde. Spring, characterized in that a steel is used as the material, which comprises: 0.35 to 0.55% C, 1.60 to 3.00% Si, 0.20 to 1.50% Mn, 0.010% or less S, 0.40 to 3.00% Ni, 0.10 to 1.50% Cr, 0.010 to 0.025% N, 0.05 to 0.50% V and balance Fe; that a heat treatment was performed to obtain a hardness of 50.5 to 55.0 HRC; and that a shot peening treatment was carried out at moderate temperatures to obtain a residual stress of -600 MPa or more at a depth of 0.2 mm below the surface.

High-strength steel sheet and method for manufacturing same

A high strength pressed member having excellent ductility and stretch flangeability and tensile strength of 780-1400 MPa, with predetermined steel composition and steel microstructure relative to the entire microstructure of steel sheet, where area ratio of martensite 5-70%, area ratio of retained austenite 5-40%, area ratio of bainitic ferrite in upper bainite 5% or more, and total thereof is 40% or more, 25% or more of martensite is tempered martensite, polygonal ferrite area ratio is above 10% and below 50% to the entire microstructure of steel sheet, and average grain size is 8 µm or less, average diameter of a group of polygonal ferrite grains is 15 µm or less, the group of polygonal ferrite grains represented by a group of ferrite grains of adjacent polygonal ferrite grains, and average carbon content in retained austenite is 0.70 mass % or more and tensile strength is 780 MPa or more.

HIGH TEMPERATURE RESISTANT STEEL TUBE WITH LOW SILICON CONTENT AND WITH IMPROVED DUCTILITY AND CAPABILITY PROPERTIES.

Martensitic stainless steels excellent in corrosion resistance and stress corrosion cracking resistance and method of heat treatment of the steels

A high-strength martensitic stainless steel excellent in corrosion resistance and stress corrosion cracking resistance, the composition of which comprises: under 0.03% carbon, 1% or less silicon, 2.3-7.0% manganese, 8-14% chromium, 0.005-0.2% aluminum, 0.005-0.15% nitrogen, and the balance of iron except incidental elements. The stainless steel can contain nickel, molybdenum, tungsten, copper, vanadium, titanium, niobium, zirconium, tanatalum, hafnium, calcium and rare earth elements under the fixed conditions in addition to the above elements. Heat treatment of the stainless steel comprises: the step of austenitizing at temperatures of 920° C. to 1,100° C., the step of cooling at a cooling rate equal to or higher than the air cooling rate, the step of tempering at temperatures between 580° C. and A cl point, and the step of cooling at a cooling rate equal to or higher than the air cooling rate.

High strength welded steel pipe and manufacturing method thereof

METHOD FOR MANUFACTURING Zn ALLOY PLATED STEEL TUBE HAVING EXCELLNT CORROSION RESISTANCE

용융 아연합금 도금강관의 제조방법이 개시된다. 본 발명의 일 실시형태는, 용융 아연합금 도금층이 형성된 강판을 관상으로 성형하는 롤 포밍단계; 상기 관상으로 성형된 강판의 양단의 간격이 유지되도록 업셋 롤로 가압함과 동시에, 고주파 용접에 의해 상기 강판의 양단을 용융시켜 접합하는 용접단계; 비드 절삭 바이트에 의해 상기 접합된 강판의 비드 돌출부를 절삭하는 비드절삭단계; 및 상기 비드 돌출부 절삭으로 인하여 도금층이 제거된 용접부 표면에 용사층을 형성하는 용사단계를 포함하는 용융 아연합금 도금강관의 제조방법에 있어서, 롤 중심을 기준으로, 상기 업셋 롤의 후방 200mm 이내의 위치에 가이드 롤을 설치하여, 상기 강판의 양단이 용융되어 형성된 용접부의 인장 변형력을 억제하는 것을 특징으로 하는 용융 아연합금 도금강관의 제조방법이 제공된다.

Austenite-base stainless steel pipe, for boiler, having excellent high-temperature steam oxidation resistance

This invention provides an austenite-base stainless steel pipe, for a boiler, having excellent high-temperature steam oxidation resistance, which austenite-base stainless steel pipe is used in a superheater and a reheater in a heat power plant. In particular, the austenite-base stainless steel pipe for a boiler has a Cr content of 16 to 20% by weight and has a cold worked inner face. The content of Cr at a position near the inner surface of the steel pipe is not less than 14% by weight, and the hardness of a 100 μm position in the inner surface of the steel pipe is at least 1.5 times the average hardness of a parent metal, or a Hv hardness of not less than 300.

Steel pipe having high formability and method for producing the same

A steel pipe having high formability which has an r value in the axial direction of 1.4 or more and exhibits, in a plane in the steel plate of the pipe at 1/2 thickness, an average of X-ray random intensity ratios with respect to the orientation group of {110}∫110⊃ to {332}∫110⊃ of 3.5 or more and/or an X-ray random intensity ratio of {110}∫110⊃ of 5.0 or more; and a method for producing the steel pipe having high formability characterized in that it comprises heating a parent steel pipe exhibiting, in a plane in the steel plate of the parent pipe at 1/2 thickness, X-ray random intensity ratios with respect to all the orientations of {001}∫110⊃, {116}∫110⊃, {114}∫110⊃ and {112}∫110⊃ of 3 or less to a temperature range of 650 to 1200 °, and subjecting it to a forming wherein a diameter reduction percentage is 30 % or more and a thickness reduction percentage is 5 to 30 %. The pipe is excellent in capability of being formed, in particular, of being hydroformed.

Pipe mold steel

A ferritic alloy steel with high ductility and high toughness, and a controlled microstructure for making pipe molds for centrifugally casting pipe consisting essentially of from about 0.12% to about 0.22% carbon, about 0.40% to about 0.80% manganese, about 0.025% maximum phosphorus, about 0.025% maximum sulphur, about 0.15% to about 0.40% silicon, about 0.00% to about 0.55% nickel, about 0.80% to about 1.20% chromium, about 0.15% to about 0.60% molybdenum, about 0.03% to about 0.08% vanadium, and balance essentially iron.

Seamless steel pipe for line pipe and method for its manufacture

Boyeror and a method for its preparation

Et bøyd rør svarende til minst API X100 grad og som har et grunnmetall med høy styrke og seighet og et sveiset metall med høy seighet er fremskaffet. En stålplate preparert ved avkjøling etter varmevalsing ved en avkjølingshastighet ved senterpartiet i platetykkelsesretningen på høyest 5 ºC pr. sekund ved 700-500 ºC er formet til et bøyd moderrør, som er oppvarmet til 900-1100 ºC og utsatt for bøying, det er så avkjølt til en temperatur på minst 300 ºC ved en avkjølingshastighet i senterpartiet av tykkelsesretningen på minst 5 ºC pr. sekund ved 700-500 ºC, hvoretter det er temperert ved 300-500 ºC.

Steel compositions for special applications

本発明は、高圧及び／又は高温下における、蒸気又は水蒸気のような酸化性環境による腐食性雰囲気における、長期にわたり優れた耐性を有する鋼に関する。本発明は、特殊用途のための鋼組成物に関し、前記組成物は、約１．８〜１１重量％のクロム（好ましくは約２．３〜１０重量％のクロム）、１重量％未満のケイ素、及び０．２０重量％〜０．４５重量％のマンガンを含む。高温性能の特定条件における腐食について実質的に最適な性能を得るために選択される、所定のモデルを元に、組成物の含有量を調整することが可能であることがわかった。前記モデルは、モリブデン、タングステン、コバルト及びニッケルから選択される少なくとも１種の元素を、添加剤として、又は残余として含み得る。 【選択図】図５

Steel pipe having high formability and method for producing the same

The present invention provides a steel pipe excellent in formability during hydraulic forming and the like and a method to produce the same, and more specifically: a steel pipe excellent in formability having an r-value of 1.4 or larger in the axial direction of the steel pipe, and the property that the average of the ratios of the X-ray intensity in the orientation component group of {110}<110> to {332}<110> on the plane at the center of the steel pipe wall thickness to the random X-ray intensity is 3.5 or larger, and/or the ratio of the X-ray intensity in the orientation component of {110}<110> on the plane at the center of the steel pipe wall thickness to the random X-ray intensity is 5.0 or larger; and a method to produce a steel pipe excellent in formability characterized by heating the steel pipe having the property that the ratio of the X-ray intensity in every one of the orientation components of {001}<110>, {116}<110>, {114}<110> and {112}<110> on the plane at the center of the mother pipe wall thickness to the random X-ray intensity is 3 or smaller to a temperature in the range from 650 to 1,200°C and by applying working under a condition of a diameter reduction ratio of 30% or more and a wall thickness reduction ratio of 5 to 30%.

Electric resistance welded steel tube for mechanical engineering, and exhibiting a very good machinability

An electric resistance welded steel pipe for mechanical engineering exhibiting very good machinability comprises, in weight percent, 0.02 - 0.60% C, up to 0.4% Si, 0.20 - 2.0% Mn, up to 0.030% P, up to 0.040% S, 0.001 - 0.030% T.Aℓ, 0.0020 - 0.0100% N, up to han 0.0060% O, and one or more of Bi, Pb or Te with a maximum of 0.040% for each of these elements and provided that the total amount of Bi, Pb and Te is not exceeding 0.050%, the remainder being Fe and unavoidable impurities. It may further comprise one or both of 0.10 - 1.50% Cr and 0.10 - 0.60% Mo and/or not more than 0.020% Ca, provided that Ca%/(1.25 x O% + 0.625 x 5%) ≧ 0.05.

Improved pipe mold steel

Steel having excellent outer surface scc resistance for pipeline

Steel which has an excellent outer surface SCC resistance for pipelines without deteriorating fundamental requirements as the pipeline material. The surface smoothness of the steel is so controlled as to have a centerline average roughness Ra 7 µm and have a maximum height Rmax 50 µm. This surface smoothness is obtained by applying shot-blast to the surface.

IMPROVEMENTS IN PROCESSES FOR TREATING TUBULAR STEEL PROFILES

L'invention concerne un traitement thermique. Le procédé est caractérisé en ce que ledit tube se trouvant à une température à laquelle correspond au plus 15 % de ferrite, est soumis à une trempe martensitique et/ou bainitique, en ce que l'on règle les conditions du refroidissement intense jusqu'à une température inférieure à celle de formation de martensite, de façon d'une part à limiter les effets de la trempe à une couche superficielle du profilé et d'autre part, de telle façon qu'à la sortie de la phase de trempe, la partie du profilé la plus éloignée de la zone trempée se trouve à une température supérieure à 675 degrés C, et en ce qu'après cette phase de revenu, le tube est soumis à un refroidissement à l'air calme. Application aux tubes de toutes sortes obtenus par laminage, extrusion, filage ou autre moyen. The invention relates to a heat treatment. The process is characterized in that the said tube being at a temperature to which corresponds at most 15% of ferrite, is subjected to a martensitic and / or bainitic quenching, in that the conditions of the intense cooling are adjusted up to a temperature lower than that of martensite formation, so on the one hand to limit the effects of the quenching to a surface layer of the profile and, on the other hand, so that at the exit of the quenching phase, the part of the profile furthest from the quenched zone is at a temperature above 675 ° C., and in that after this tempering phase, the tube is subjected to cooling in still air. Application to tubes of all kinds obtained by rolling, extrusion, extrusion or other means.

Steel compositions for special uses

MATERIAL FOR A PIPE FOR INJECTING FUEL AT HIGH PRESSURE

Oil country tubular goods excellent in collapse characteristics after expansion and method of production thereof

The present invention provides a method of production of oil country tubular goods having a small drop in collapse pressure after expansion and having a collapse pressure recovering by low temperature ageing at about 100° C. and oil country tubular goods obtained by this method of production. This method of production comprises hot rolling a steel slab having amounts of addition of C, Mn, P, S, Nb, Ti, Al, and N in specific ranges and having a balance of iron and unavoidable impurities and shaping the steel strip coiled at a temperature of not more than 300° C. as it is into a tube. Alternatively, it comprises heating steel pipe having amounts of addition of C, Mn, P, S, Nb, Ti, Al, and N in specific ranges and having a balance of iron and unavoidable impurities to a temperature of the Ac 3 [° C.] to 1150° C., then cooling it in a range of 400 to 800° C. at a rate of 5 to 50° C./second.

CARBON DEPOSIT, DOUBLE-COATED TUBE

Steel pipe with good formable character and producing method thereof

本发明提供在液压成形等方法中可成形性优异的钢管以及生产方法，更具体的说：一种成形性优异的钢管，其沿着钢管轴向方向的r值大于等于1.4；并且具有以下特性：在钢管壁厚中央处的平面上的{110}<110>至{332}<110>取向分量组的X射线强度与随机X射线强度的比值的平均值大于等于3.5，和/或在钢管壁厚中央处的平面上的{110}<110>取向分量的X射线强度与随机X射线强度的比值为大于等于5.0；以及一种生产该成形性优异的钢管的方法，其特征在于将其特性为在母钢管的壁厚中央处的平面上的{001}<110>、{116}<110>、{114}<110>和{112}<110>取向分量中的每一个的X射线强度与随机X射线强度的比值小于等于3的钢管加热至650℃-1200℃并在减径率为大于等于30%、壁厚减小率为5-30%的条件下进行加工。

Seamless steel pipe for line pipe and manufacturing method thereof

Method for manufacturing bottle member for air bag inflator

An airbag inflator bottle member comprising a tubular body having a reduced-diameter portion at an end portion for fitting an initiator or the like thereto in which the reduced-diameter portion has a good low temperature toughness comparable to that of the portion which is not reduced in diameter is manufactured by the following method. A steel tube having a composition comprising C: 0.05 -- 0.20%, Si: 0.1 - 1.0%, Mn: 0.10 - 2.0%, Cr: 0.05 - 2.0%, sol. Al: at most 0.10%, Ca: 0.0003 - 0.01%, optionally one or more elements selected from Cu: at most 1.0%, Ni: at most 1.5%, Mo: at most 1.0%, V: at most 0.2%, Nb: at most 0.1%, and Ti: at most 0.1%, and a remainder of Fe and impurities in which P: at most 0.025% and S: at most 0.010% is subjected to cold working, then it is cut to a predetermined length, and the cut steel tube is subjected to reducing in at least one end portion thereof and then to quenching and tempering.

APPLICATION OF RODS MADE OF CARBON STALL OR STORED STRAIGHT IN ACID, SULFUR WEATHER ENVIRONMENT

Heat-treating tubular steel sections

High strength steel member with a low yield ratio

A high tensile strength, low yield ratio steel member has a steel composition consisting essentially of, by weight: C: 0.15-0.40%, Si: 0.10-0.70%, Mn: 1.0-2.7%, Cr: 1.0-3.5%, sol.Al: 0.01-0.05%, P: not larger than 0.025%, S: not larger than 0.015%, Mo: 0-1.0% Ni: 0-2.5%, V: 0-0.10%, Ti: 0-0.10%, Nb: 0-0.10%, B: 0-0.0050%. Fe and incidental impurities: balance the below-described bainite index (%) of the steel composition being 0-50%, the steel being comprised of a single phase of martensite or a martensite and bainite duplex structure containing 50% or less of bainite. Bainite Index (%)=-209 C+43Si-48Mn-58Cr-0.416R+317 wherein R is a cooling rate (°C./min).

Thick welded steel pipe having excellent low-temperature toughness, method for producing thick welded steel pipe having excellent low-temperature toughness, and steel sheet for producing thick welded steel pipe

The present invention provides a thick welded steel pipe having excellent low-temperature toughness. The Mn and Mo content of this thick welded steel pipe having excellent low-temperature toughness satisfies formula 1 below, and Pcm, derived according to formula 2 below, is 0.16 to 0.19. The metal structure of the steel sheet base material comprises, in area ratio, 30 to 95% ferrite and a low-temperature transformation structure, in the metal structure of a coarse-grained HAZ, the area ratio of a ferrite grain boundary is at least 1.5%, the total area ratio of the ferrite grain boundary and intragranular ferrite is 25% to 90%, the area ratio of MA is not more than 10%, and the remainder comprises bainite. 1.2325 ≤ (0.85 × [Mn]-[Mo]) ≤ 1.5215 (formula 1) Pcm = [C]+[Si]/30+([Mn]+[Cu]+[Cr])/20+[Ni]/60+[Mo]/15+[V]/10 (formula 2)

Cage for stationary type constant velocity joint has pockets each having pair of end faces that oppose each other in circumferential direction of cage and pair of side faces opposing each other in axial direction

The cage has outer and inner (11) rings, and a cylindrical portion (32) with pockets (36) at equal angular intervals to receive balls for transmitting a turning torque between the rings. The cage has a spherical outer surface kept in contact with and guided by a spherical inner surface of the outer ring. The pockets each have a pair of end faces that oppose each other in a circumferential direction of the cage and a pair of side faces opposing each other in an axial direction.

High-strength steel sheet and method for manufacturing same

본 발명에 따라, 소정의 강 성분을 함유하고, 강판조직을, 강판조직 전체에 대한 면적률로, 마텐자이트의 면적률을 5 ~ 70 %, 잔류 오스테나이트의 면적률을 5 ~ 40 %, 상부 베이나이트중의 베이나이틱 페라이트의 면적률을 5 % 이상으로 하고, 또한 상기 마텐자이트의 면적률과 상기 잔류 오스테나이트의 면적률과 상기 베이나이틱 페라이트의 면적률의 합계를 40 % 이상으로 하고, 상기 마텐자이트중 25 % 이상을 템퍼링 마텐자이트로 하고, 폴리고날 페라이트의 강판조직 전체에 대한 면적률을 10 % 초과 50 % 미만으로, 또한 그 평균 입경을 8㎛ 이하로 하여 인접하는 폴리고날 페라이트 입자로 이루어지는 한 그룹의 페라이트 입자를 폴리고날 페라이트 입자 그룹으로 했을 때, 그 평균 직경을 15 ㎛ 이하, 나아가 상기 잔류 오스테나이트중의 평균 C 량을 0.70 질량% 이상으로 하여 인장강도를 780 ㎫ 이상으로 함으로써, 연성 및 신장 플랜지성이 우수하고, 또한 인장강도가 780 ~ 1400 ㎫ 인 고강도 프레스 부재를 얻을 수 있다. According to the present invention, there is provided a steel sheet comprising a predetermined steel component and having an area ratio of 5 to 70% for martensite, an area ratio of 5 to 40% for retained austenite, Wherein the area ratio of the bainite ferrite in the upper bainite is 5% or more, and the sum of the area ratio of the martensite, the area ratio of the retained austenite, and the area ratio of the bainitic ferrite is 40% , Wherein at least 25% of the martensite is tempered martensite, the area ratio of the polygonal ferrite to the entire steel sheet structure is more than 10% but less than 50%, and the average particle diameter thereof is not more than 8 μm, When a group of ferrite particles composed of polygonal ferrite particles is used as a group of polygonal ferrite particles, the average diameter thereof is 15 占 퐉 or less, and furthermore, the average amount of C in the retained austenite is 0.70 mass % Or more and a tensile strength of 780 MPa or more, a high-strength press member having excellent ductility and stretch flangeability and tensile strength of 780 to 1400 MPa can be obtained.

Process for manufacturing an airbag inflator bottle member

Cage for constant-velocity joint and method for manufacturing the same

본 발명은 등속 조인트의 케이지의 강도를 증가시키기 위하여 제안된 것이다. 케이지의 원주방향으로 서로 대향하고 케이지에 형성된 각 포켓의 한쌍의 단면이 경화 후 절삭되는 표면으로 형성되고, 그 표면 경도가 케이지의 축방향으로 서로 대향하는 각 포켓의 한쌍의 측면의 표면 경도 보다 작게 되고 포켓 사이에 형성된 브리지부에 인성을 나누어 주며 따라서 상기 케이지의 강도를 증가시킨다. 케이지,등속,조인트,포켓,단면,측면,브리지,볼,내륜,외륜,토크,홈

Patent JPS6240419B2

METHOD FOR PRODUCING PARTS OF A BEARING, IN PARTICULAR BALL BEARING, MOSTLY THE INNER RING THEREOF

Steel having excellent outer surface scc resistance for pipeline

파이프라인 재료의 기본적인 요구들을 악화시킴이 없이 파이프라인의 외면 SCC 저항성이 우수한 강이다. 상기 강 표면의 평활성은 중심선 평균 조도 Ra 가 7 ㎛ 이하이고 최대 높이 Rmax 가 50 ㎛ 이하가 되도록 조정된다. 이러한 표면 평활성은 상기 표면에 숏 블라스팅을 적용하는 것에 의해 얻어진다. It is a steel with excellent external SCC resistance of the pipeline without degrading the basic requirements of the pipeline material. The smoothness of the steel surface is adjusted so that the centerline average roughness Ra is 7 µm or less and the maximum height Rmax is 50 µm or less. This surface smoothness is obtained by applying shot blasting to the surface.

Seamless steel pipe for pipe line and method for producing same

A high strength steel having excellent low temperature tenacity and excellent tenacity in the portion affected by welding-heat and a method for manufacturing the high strength steel and a high strength steel pipe

본 발명의 과제는 켄칭성 원소를 첨가하여 고강도화를 도모한 강의 저온 인성의 신뢰성을 향상시키는 동시에, 2층 이상의 용접을 행했을 때의 열영향부의 인성을 개선하여, 현지 용접성이 우수한 초고강도 강관 및 제조 방법을 제공하는 것으로, 소정량의 C, Si, Mn, P, S, Ni, Mo, Nb, Ti, Al, N를 함유하고, 특히 Nb량을 0.010 ％ 미만으로 제한하여 필요에 따라서 B, V, Cu, Cr, Ca, REM, Mg 중 1종류 이상을 함유하고, 또한 켄칭성 원소인 C, Si, Mn, Cr, Ni, Cu, V, Mo을 관계식으로 구하게 되는 P치를 1.9 내지 4.0으로 하고, 조직을 베이나이트 및/또는 마르텐사이트로 이루어지는 조직으로 한다. 구오스테나이트 입경을 소정의 범위로 해도 좋다. 주조 부재를 Ac 3 이상으로 가열하여, 열간 압연을 실시한 후, 소정의 냉각 속도로 냉각하는 제조 방법이다. An object of the present invention is to improve the reliability of low-temperature toughness of steel with high strength by adding a hardenable element, and to improve the toughness of the heat affected zone when two or more layers are welded, and to provide excellent weldability. By providing a manufacturing method, it contains a predetermined amount of C, Si, Mn, P, S, Ni, Mo, Nb, Ti, Al, N, in particular, the amount of Nb is limited to less than 0.010% B, P value containing at least one of V, Cu, Cr, Ca, REM, and Mg, and obtaining the hardenable elements C, Si, Mn, Cr, Ni, Cu, V, and Mo from 1.9 to 4.0 The tissue is composed of bainite and / or martensite. The former austenite particle diameter may be in a predetermined range. After heating the cast member in more than Ac 3, subjected to hot rolling, a method for producing cooling at a predetermined cooling rate.

PROCEDURE FOR TREATMENT OF TUBE

Method for heat treating an impact beam of automotive vehicle door and a system of the same

A method and a system for heat treating an impact beam of an automotive vehicle door. Hot rolled steel sheets are prepared having a composition consisting essentially of 0.18% to 0.22% carbon; 1.0 to 1.5% manganese; 0.15 to 0.4% silicon; not more than 0.025% phosphorous; not more than 0.008% nitrogen; not more than 0.0010% sulfur; 0.01 to 0.04 aluminum; 0.001 to 0.003% boron; 0.1 to 0.3% chromium; 0.01 to 0.035% titanium; and the balance essentially iron, roll-forming and welding the steel sheets to make a tube-shaped impact beam. The heat treatment is carried out by high frequency induction heating and air cooling the impact beam, and water cooling the heat treated and air cooled impact beam.

Steel pipe excellent in formability and method of producing the same

The present invention provides a steel pipe excellent in formability during hydraulic forming and the like and a method to produce the same, and more specifically: a steel pipe excellent in formability having an r-value of 1.4 or larger in the axial direction of the steel pipe, and the property that the average of the ratios of the X-ray intensity in the orientation component group of {110} < 110 > to {332} < 110 > on the plane at the center of the steel pipe wall thickness to the random-X-ray intensity is 3.5 or larger, and/or the ratio of the X-ray intensity in the orientation component of {110} < 110 > on the plane at the center of the steel pipe wall thickness to the random X-ray intensity is 5.0 or larger; and a method to produce a steel pipe excellent in formability characterized by heating the steel pipe having the property that the ratio of the X-ray intensity in every one of the orientation components of {001} < 110 > , {116} < 110 > , {114} < 110 > and {112} < 110 > on the plane at the center of the mother pipe wall thickness to the random X-ray intensity is 3 or smaller to a temperature in the range from 650 to 1,200°C and by applying working under a condition of a diameter reduction ratio of 30% or more and a wall thickness reduction ratio of 5 to 30%.

High-strength Cr-Ni alloy product and seamless oil well pipes made by usinfg the same

本发明提供一种高强度Cr-Ni合金材料以及使用其的油井用无缝管，所述合金材料的热加工性和耐应力腐蚀裂纹性优异。一种高强度Cr-Ni合金材料和油井用无缝管，其特征在于，其含有以质量％计的如下成分：C：0.05％以下、Si：0.05～1.0％、Mn：0.01％以上且不足3.0％、P：0.05％以下、S：0.005％以下、Cu：0.01～4％、Ni：25％以上且不足35％、Cr：20～30％、Mo：0.01％以上且不足4.0％、N：0.10～0.30％、Al：0.03～0.30％、O(氧)：0.01％以下、REM(稀土元素)：0.01～0.20％，剩余部分由Fe和杂质组成，并且满足下述(1)式的条件。还可以代替一部分Fe，含有W、Ti、Nb、Zr、V、Ca、Mg中的1种以上。N×P/REM≤0.40 (1)式，其中，(1)式中的P、N、REM各自表示P、N、REM的含量(质量％)。

Heat-treating method and product

Laser-welded steel pipe and method therefor

A laser-welded steel pipe comprises: a steel pipe consisting essentially of C in an amount of 0.01 to 0.5 wt.%, Si in an amount of 1 wt.% or less, Mn in an amount of 0.05 to 2 wt.% and Cr in an amount of 6 wt.% or less; and a weld zone having a melted and solidified metal structure containing carbon and oxygen. The carbon content, [C wt.%], and the oxygen content, [O wt.%], in the melted and solidified metal structure satisfies the following equations: [Cwt.%] x [Owt.%] ? 0.006, for the steel pipe containing C in an amount of less than 0.2 wt.%, [O wt.%] ? 0.03, for the steel pipe containing C in an amount of 0.2 wt.% or more. A manufacturing method includes: pressing a open pipe by squeeze rolls to butt the two edge parts each other; and welding the butted two edge parts by irradiating a laser beam to heat and melt the two edge parts.

Surgical metallic device

Structural component for a coal gasification system, made from a sulfidation resisting chromium-nickel-aluminium-silicon alloy steel

A structural component 17 for a coal gasification system is subjected to a hot gaseous atmosphere, produced by the reaction between coal and a gasifier, such as oxygen, air, steam or hydrogen. The component should resist sulphide embrittlement, a corroslon form caused by H 2 S at high temperature, and is made of a Cr-Ni-Al-Si alloy steel, consisting essentially of, by weight: Fe balance, with a minimum of 50%.

High-strength high-toughness steel , method for producing the same and method for producing high-strength high-toughness steel pipe

The present invention provides an ultra-high-strength steel pipe excellent in weldability on site and a method for producing the steel pipe by improving the reliability of the low temperature toughness of a steel to which elements to enhance hardenability are added for furthering high-strengthening and also improving toughness at a weld heat affected zone subjected to double or more layer welding and, in the method, the steel is made to consist of a structure composed of bainite and/or martensite by containing prescribed amounts of C, Si, Mn, P, S, Ni, Mo, Nb, Ti, Al and N, and, as occasion demands, one or more of B, V, Cu, Cr, Ca, REM and Mg, and regulating C, Si, Mn, Cr, Ni, Cu, V and Mo, those being elements to enhance hardenability, by a specific relational expression. The diameter of prior austenite grains may be regulated in a prescribed range. The method includes the steps of heating a casting to a temperature not lower than the Ac 3 point, hot rolling it, and thereafter cooling the resulting hot-rolled steel plate at a prescribed cooling rate.

Steel pipe having excellent formability and method for production thereof

A steel pipe having excellent formability, characterized in that it comprises, in mass %, 0.0005 to 0.30 % of C, 0.001 to 2.0 % of Si and 0.01 to 3.0 %of Mn, and optionally contains specific amounts of specific elements, the balance being Fe and inevitable impurities, and, with respect to the plate plane at 1/2 plate thickness position of a steel plate, an average X-ray random intensity ratio of the orientation groups of {110}<110> to {111}<110> is 2.0 or more and/or an X-ray random intensity ratio of {110}<110> is 3.0 or more. The steel pipe has high strength and exhibits excellent formability in the hydroform process and other forming processes.

High strength steel pipe having strength higher than that of api x65 grade

The present invention provides a high-strength steel pipe of API X65 grade or higher consisting essentially of, by mass %, 0.02 to 0.08% of C, 0.01 to 0.5% of Si, 0.5 to 1.8% of Mn, 0.01% or less of P, 0.002% or less of S, 0.01 to 0.07% of Al, 0.005 to 0.04% of Ti, 0.05 to 0.50% Mo, at least one element selected from 0.005 to 0.05% of Nb and 0.005 to 0.10% of V, and the balance being Fe, in which the volume percentage of ferritic phase is 90% or higher, and complex carbides containing Ti, Mo, and at least one element selected from Nb and V are precipitated in the ferritic phase. The high-strength steel pipe in accordance with the present invention has excellent HIC resistance and good toughness of heat-affected zone, and can be manufactured stably at a low cost.

Spring with corrosion fatigue strength

A spring is provided having a high durability in actual use and sagging resistance of the same level as or higher than conventional ones through improvement of the corrosion fatigue resistance. The spring uses as a material a steel including C: 0.35-0.55%, Si: 1.60-3.00%, Mn: 0.20-1.50%, S: 0.010% or less, Ni: 0.40-3.00%, Cr: 0.10-1.50%, N: 0.010-0.025%, V: 0.05-0.50% and Fe balance. The steel is heat treated to have a hardness of 50.5-55.0 HCC and shot-peened at a moderate temperature to render a residual stress of −600 MPa or more at a depth of 0.2 mm below the surface. The temperature at which the spring is shot-peened is preferably 100-300° C., and the hardness of shot particles for the shot-peening is preferably 450-600 Hv.

High strength line pipe steel having low yield ratio and excellent low temperature

본 발명은 초고강도 저항복비 라인 파이프 강재를 공급하기 위한 것으로 이 강재는 우수한 HAZ 인성과 우수한 현장용접성 및 적어도 950 이상의 인장강도 (API 표준으로 X 100을 초과)를 가지고 또한, 이 강재는 B, Cu, Cr, V을 필요시 선택적으로 함유하는 저탄소-고Mn-Ni-Mo-Nb-소량의 Ti을 가지며, 그 현미경조직은 마르텐사이트/베이나이트 및 페라이트 연/강의 2상 혼합조직으로 되며 여기에서 파라이트분율은 20~90%, 이 페라이트는 50~100% 가공된 페라이트로 되며, 페라이트 결정립경은 5 이하로 된다. The present invention is intended to supply ultra-high strength, low-ratio line pipe steel, which has excellent HAZ toughness and good field weldability and at least 950. It has a tensile strength above (more than X 100 in API standard) and also has a low carbon-high Mn-Ni-Mo-Nb-a small amount of Ti, which optionally contains B, Cu, Cr, and V, if necessary. The microstructure consists of a two-phase mixed structure of martensite / bainite and ferrite lead / steel, where the ferrite fraction is 20 to 90%, the ferrite is 50 to 100% processed ferrite, and the ferrite grain size is 5 It becomes as follows. 본 발명은 상기 저항복비와 우수한 저온인성과 우수한 용접성을 가지는 고강도 라인 파이프(X 100을 초과)을 제조할 수 있고, 이에 따라 파이프라인의 안정성이 현저히 향상되고, 또한 실시효과와 파이프라인의 수송효과가 엄청나게 향상 가능하다. The present invention can produce a high-strength line pipe (greater than X 100) having the above-mentioned resistance ratio and excellent low-temperature toughness and excellent weldability, thereby significantly improving the stability of the pipeline, and also the effect of implementation and transport of the pipeline There is tremendous improvement.

Resilient tantalum tubes and a process for making same

1.25Cr-0.5Mo steel pipe without welding heat treatment and welding method thereof

stainless steel pipe and method of manufacture

Austenite-base stainless steel pipe, for boiler, having excellent high-temperature steam oxidation resistance

High-strength steel excellent in low temperature toughness and toughness at weld heat affected zone, method for producing the same and method for producing high-strength steel pipe

【課題】焼き入れ性元素を添加して高強度化を図った鋼の低温靭性の信頼性を向上させるとともに、２層以上の溶接を行った際の熱影響部の靭性を改善し、現地溶接性に優れた超高強度鋼管および製造方法を提供する。 【解決手段】所定量のＣ、Ｓｉ、Ｍｎ、Ｐ、Ｓ、Ｎｉ、Ｍｏ、Ｎｂ、Ｔｉ、Ａｌ、Ｎを含有し、必要に応じてＢ、Ｖ、Ｃｕ、Ｃｒ、Ｃａ、ＲＥＭ、Ｍｇの１種以上を含有し、さらに焼き入れ性元素であるＣ、Ｓｉ、Ｍｎ、Ｃｒ、Ｎｉ、Ｃｕ、Ｖ、Ｍｏを関係式によって規定し、組織をベイナイトおよび／またはマルテンサイトからなる組織にする。旧オーステナイト粒径を所定の範囲としても良い。鋳片をＡ Ｃ３ 以上に加熱し、熱間圧延を施した後、所定の冷却速度で冷却する製造方法。 【選択図】　　　なし

Bend pipe and process for manufacturing the same

本发明提供一种弯管，母材同时具有高的强度和优异的韧性，并且焊接金属也具有优异的韧性，例如相当于API规格X100等级以上的弯管。通过热轧后在700～500℃以不足5℃/sec的板厚方向中心部的冷却速度进行冷却制造厚钢板，将该厚钢板作为原料制造焊接钢管即弯管坯，将该弯管坯加热到900～1100℃弯曲加工后，在700～500℃以5℃/sec以上的壁厚方向中心部的冷却速度冷却到300℃以下的温度区域，之后，在300～500℃进行回火，由此制造相当于API规格X100等级以上的弯管。

Nitrided steel tubes

Seamless steel pipe for line pipe and a process for its manufacture

Method for laser welding steel tubes and apparatus for carrying out the method