Plated steel material

A plated steel material comprising a steel base material and an Al—Zn—Mg-based plating layer formed on a surface of the steel base material, wherein the plating layer has a predetermined chemical composition, and in a surface structure of the plating layer, there is, by area ratio, 2.0% or more of an acicular Al—Zn—Si—Ca phase.

ULTRA HIGH STRENGTH COLD ROLLED STEEL SHEET HAVING EXCELLENT SPOT WELDABILITY AND FORMABILITY, ULTRA HIGH STRENGTH PLATED STEEL SHEET AND MANUFACTURING METHOD THEREFOR

The present invention provides an ultra high strength cold rolled steel sheet having excellent spot weldability and formability. The ultra high strength cold rolled steel sheet, according to one embodiment of the present invention, comprises, in weight percent,: 0.05% to 0.09% of carbon (C); 0.5% to 1.0% of silicon (Si); 2.0% to 2.8% of manganese (Mn); 0.2% to 0.5% of aluminum (Al); 0.8% to 1.2% of chromium (Cr); 0.05% to 0.10% of molybdenum (Mo); 0.03% to 0.06% of titanium (Ti); 0.001% to 0.003% of boron (B); 0.02% to 0.05% of antimony (Sb); 0.001% to 0.015% of phosphorus (P); greater than 0% to 0.003% of sulfur (S); 0.004% to 0.006% of nitrogen (N); and a balance of iron (Fe) and other inevitable impurities, and the ultra high strength cold rolled steel sheet comprises a microstructure comprising ferrite and low hardness martensite.

METHOD FOR MANUFACTURING TAILOR WELDED BLANK USING STEEL SHEET FOR HOT PRESSING HAVING AL-FE-BASED INTERMETALLIC ALLOY LAYER

An embodiment of the present invention provides a method for manufacturing a tailor welded blank using a steel sheet for hot pressing having an Al-Fe-based intermetallic alloy layer, the method comprising the steps of: preparing a plated steel sheet having a base steel sheet and an aluminum-based plated layer formed on one surface or both surfaces of the base steel sheet; heat-treating the plated steel sheet so that the aluminum-based plated layer becomes an Al-Fe-based intermetallic alloy layer; and subjecting the heat-treated plated steel sheet to butt welding, wherein, before the welding, a part or the entirety of the Al-Fe-based intermetallic alloy layer located in an area to be welded is removed.

HIGH-STRENGTH STEEL SHEET AND METHOD FOR PRODUCING SAME

HOT DIP ALLOY COATED STEEL MATERIAL HAVING EXCELLENT ANTI-CORROSION PROPERTIES AND METHOD OF MANUFACTURING SAME

An embodiment of the present disclosure provides a hot dip alloy coated steel material having high corrosion resistance, the hot dip alloy coated steel material including: a base steel sheet; and a hot dip alloy coating layer formed on the base steel sheet, wherein the hot dip alloy coating layer includes, by wt %, Al: from greater than 8% to 25%, Mg: from greater than 4% to 12%, and a balance of Zn and other inevitable impurities, wherein a surface of the hot dip alloy coating layer has a surface X-ray diffraction intensity satisfying Condition 1 below: [Condition 1] 2000 cps≤X-ray diffraction intensity≤20000 cps where the X-ray diffraction intensity refers to M−N, M refers to a greatest peak intensity within a 2θ range of 20.00° to lower than 21°, and N refers to a peak intensity at 2θ=20.00°.

Coated steel material

A coated steel material including: a base steel, and a coating layer containing a Zn—Al—Mg alloy layer disposed on a surface of the base steel, wherein the coating layer has a predetermined chemical composition, and, in a backscattered electron image of the Zn—Al—Mg alloy layer that is obtained at a time of observing the surface of the Zn—Al—Mg alloy layer after polishing to ½ of the layer thickness, under a scanning electron microscope at a magnification of 100×, Al crystals are present, and the average value of the cumulative circumferential length of the Al crystals is 88 to 195 mm/mm2.

DEVICE FOR SOLIDIFYING A HOT DEPOSITED COATING ON A WIRE, INSTALLATION AND PROCEDURE THEREFOR

HOT-DIP ZN-AL-MG-BASED ALLOY-PLATED STEEL MATERIAL HAVING EXCELLENT CORROSION RESISTANCE OF PROCESSED PORTION, AND METHOD FOR MANUFACTURING SAME

An embodiment of the present invention provides a hot dip Zn-Al-Mg-based alloy-plated steel material having excellent corrosion resistance of a processed portion, and a method for manufacturing same. The steel material includes an iron substrate, and a hot-dip alloy-plated layer formed on the iron substrate, the hot-dip alloy-plated layer comprising 8-25 wt% (exclusive of 8 wt%) of Al, and 4-12 wt% (exclusive of 4 wt%) of Mg, with the balance being Zn and other inevitable impurities, wherein the fraction of an MgZn2 phase in the hot-dip alloy-plated layer is 10-45 area%, the MgZn2 phase has cracks on the inside, and 3-80 of the cracks per 100 µm in a direction perpendicular to the thickness direction of a steel sheet are visible in a cross-section of the steel sheet in the thickness direction thereof.

METHOD FOR PRODUCING HARDENED STEEL COMPONENTS WITH A CONDITIONED ZINC ALLOY CORROSION PROTECTION LAYER

MEMBER FOR AUTOMOBILE STRUCTURE

One embodiment of the present invention discloses a member for automobile structure including a base steel sheet and a plating layer covering at least one surface of the base steel sheet, wherein the member for automobile structure has a tensile strength of 1350 MPa or greater and a yield strength of 900 MPa or greater, wherein the base steel sheet includes a martensite phase having an area fraction of 80 % or greater, an iron-based carbide located inside the martensite phase and having an area fraction of less than 5% based on the martensite phase, and precipitates distributed inside the base steel sheet, wherein a mismatch dislocation exists at the interface between iron and the precipitates of the base steel sheet, and a difference between lattice constants of the iron and the precipitates is less than 25 % of the lattice constants of the iron.

COATED STEEL PRODUCT

HOT-DIP PLATED STEEL

A hot-dip plated steel according to one aspect includes a base steel and a hot-dip plating layer disposed on a surface of the base steel, a chemical composition of the hot-dip plating layer contains, by mass%, Al: 10.00% to 30.00%, Mg: 3.00% to 12.00%, Sn: 0% to 2.00%, Si: 0% to 2.50%, Ca: 0% to 3.00%, Ni: 0% or more and less than 0.25%, Fe: 0% to 5.00%, and the like, a remainder consists of Zn and impurities, a metallographic structure of the hot-dip plating layer contains 5 to 45 area% of an α phase having a grain diameter of 0.5 to 2 µm, the metallographic structure of the hot-dip plating layer contains 15 to 70 area% of a MgZn2 phase, and, among the α phases having the grain diameter of 0.5 to 2 µm, an area ratio of an α phase having a (111)α//(0001)MgZn2 orientation relationship to the adjacent MgZn2 phase is 25% to 100%.

HOT-DIP Zn-BASED PLATED STEEL SHEET

This hot-dip Zn-based plated steel sheet includes a steel sheet and a plating layer formed on at least part of a surface of the steel sheet, in which the plating layer has a chemical composition that includes, by mass %, Al: 6.00% to 35.00%, Mg: 2.00% to 12.00%, Ca: 0.005% to 2.00%, Si: 0% to 2.00%, Fe: 0% to 2.00%, Sb: 0% to 0.50%, Sr: 0% to 0.50%, Pb: 0% to 0.50%, Sn: 0% to 1.00%, Cu: 0% to 1.00%, Ti: 0% to 1.00%, Ni: 0% to 1.00%, Mn: 0% to 1.00%, Cr: 0% to 1.00%, and a remainder: Zn and impurities, the plating layer has an area ratio of a MgZn2phase in a range of 15% to 60% in a cross section in a thickness direction, and the MgZn2phase includes a Ca-based intermetallic compound having a circle equivalent diameter of 0.10 μm or smaller.

COATED STEEL SHEET WITH THIN ALUMINUM ALLOY COATING AND COATING METHOD THEREFOR

The present invention relates to a coated steel sheet having a thin aluminium alloy coating and a coating method thereof. The coated steel sheet of the present invention is used for hot stamping. The coating thickness of the coated steel sheet is 5∼14 µm, wherein the aluminium alloy coating comprises a FeAlSi inhibitive layer adjacent to a substrate steel sheet and an Al alloy layer outside the FeAlSi inhibitive layer, wherein the thickness of the FeAlSi inhibitive layer is no more than 60% of the coating thickness and is 1.5~6.0 µm. The diameters of Kirkendall voids within 2 µm from an interface between the FeAlSi inhibitive layer and the substrate steel to the interior of the substrate steel are no more than 2.5 µm, wherein the number of Kirkendall voids with a diameter of no less than 0.5 µm and no more than 2.5 µm does not exceed 15 per 35 µm.The present invention also discloses a coating method for coating a thin aluminium alloy coating on a substrate steel sheet for hot stamping.

PLATED STEEL SHEET HAVING EXCELLENT SEALER ADHESION AND METHOD FOR MANUFACTURING SAME

The present invention relates to a plated steel sheet which can be used for automobiles, home appliances, building materials, etc. and a method for manufacturing same and, more particularly, to a zinc alloy plated steel sheet having excellent adhesion to an adhesive and a method for manufacturing same.

HOT PRESS FORMED PRODUCT HAVING EXCELLENT CORROSION RESISTANCE AND METHOD FOR PREPARING SAME

Provided is a hot press formed product, which is prepared by means of hot press forming of a Zn—Al—Mg-based plated steel material comprising base iron and a Zn—Al—Mg-based plated layer, and a method for preparing the same, the hot press formed product comprising an oxide layer formed on the surface thereof, wherein the content ratio of Al to Mg (Al/Mg) in the oxide layer is 0.8 or more.

Hot-dip plated steel

A hot-dip plated steel includes a base steel and a hot-dip plating layer on a surface of the base steel, a chemical composition of the hot-dip plating layer contains, by mass %, Al: 10.00% to 30.00%, Mg: 3.00% to 12.00%, Sn: 0% to 2.00%, Si: 0% to 2.50%, Ca: 0% to 3.00%, Ni: 0% or more and less than 0.25%, Fe: 0% to 5.00%, and the like, a remainder includes Zn and impurities, a metallographic structure of the hot-dip plating layer contains 5 to 45 area % of an α phase having a grain diameter of 0.5 to 2 μm, the metallographic structure of the hot-dip plating layer contains 15 to 70 area % of a MgZn2phase, and, among the α phases having the grain diameter of 0.5 to 2 μm, an area ratio of an α phase having a (111)α//(0001)MgZn2orientation relationship to the adjacent MgZn2phase is 25% to 100%.

ZINC ALLOY PLATED STEEL MATERIAL HAVING EXCELLENT WELDABILITY

HIGH STRENGTH GALVANNEALED STEEL SHEET AND METHOD OF PRODUCING SUCH STEEL SHEET

Plated steel sheet for hot stamping

A plated steel sheet for hot stamping including a base metal and a galvanized layer that is formed on a surface of the base metal, wherein the galvanized layer includes a galvannealed layer, a solidified zinc layer, and an oxide layer containing Al, in this order from the base metal, and a proportion of a content of Zn (g/m2) in the solidified zinc layer to a content of Zn (g/m2) in the galvanized layer is 10 to 95%.

PLATED STEEL MATERIAL

A plated steel material comprising a steel base material and an Al-Zn-Mg-based plating layer formed on a surface of the steel base material, wherein the plating layer has a predetermined chemical composition, and in a surface structure of the plating layer, there is, by area ratio, 2.0% or more of an acicular Al-Zn-Si-Ca phase.

HOT-STAMPED ARTICLE

A hot stamped body comprising a steel base material and an Al-Zn-Mg-based plating layer formed on a surface of the steel base material, wherein the plating layer has a predetermined chemical composition, the plating layer comprises an interfacial layer positioned at an interface with the steel base material and containing Fe and Al and a main layer positioned on the interfacial layer, the main layer comprises, by area ratio, 10.0 to 70.0% of an Mg-Zn containing phase and 30.0 to 90.0% of an Fe-Al containing phase, the Mg-Zn containing phase comprises at least one selected from the group consisting of an MgZn phase, Mg2Zn3 phase, and MgZn2 phase, and the Fe-Al containing phase comprises an FeAl phase and Fe-Al-Zn phase and an area ratio of the Fe-Al-Zn phase in the main layer is more than 10.0 to 75.0%.

HIGH-STRENGTH HOT-DIP GALVANIZED STEEL SHEET AND METHOD FOR MANUFACTURING SAME

HOT STAMPED COMPONENT, PRE-COATED STEEL PLATE FOR HOT STAMPING, AND HOT STAMPING PROCESS

The present invention relates to a hot stamped component, a precoated steel sheet used for hot stamping, and a hot stamping process. The hot stamped component of the present invention is provided with a coating of aluminium or an aluminium alloy on at least one surface of the base steel, the coating is produced by interdiffusion between the base steel and a precoating of aluminium or aluminium alloy, and the coating has a thickness of 6 to 26 µm.

HOT STAMPED COMPONENT, PRE-COATED STEEL PLATE FOR HOT STAMPING, AND HOT STAMPING PROCESS

COLD ROLLED AND HEAT-TREATED STEEL SHEET AND METHOD OF MANUFACTURING THE SAME

COATED STEEL MEMBER, COATED STEEL SHEET, AND METHODS FOR PRODUCING SAME

The present invention relates to a coated steel member comprising a steel sheet substrate having a certain chemical composition and a coating formed on a surface of the steel sheet substrate and containing Al and Fe, wherein the coating has a low Al content region having an Al content of 3 mass% or more and less than 30 mass% and a high Al content region formed on a side closer to a surface than the low Al content region and having an Al content of 30 mass% or more, a maximum C content of the high Al content region is 25% or less of a C content of the steel sheet substrate, a maximum C content of the low Al content region is 40% or less of the C content of the steel sheet substrate, and a maximum C content in a range from an interface between the steel sheet substrate and the coating to a depth of 10 µm on a side of the steel sheet substrate is 80% or less of the C content of the steel sheet substrate.

Steel sheet for hot press formed member having excellent coating adhesion and manufacturing method for the same

The present invention relates to a steel sheet for a hot press formed member having excellent coating adhesion, and a method for manufacturing the same. A steel sheet for hot press forming according to one aspect of the present invention is an aluminum alloy plated steel sheet, wherein an average Fe content in a plating layer may be 40 wt % or more, and a concentration gradient of a section having a Fe content of 45 wt % to 80 wt % in the plating layer may 7 wt %/μm or less of a concentration gradient at a section having an Fe content of 45% to 80% in the plating layer in a thickness direction from a surface of the plating layer according to a result of GDS analysis.

HOT DIP GALVANIZED STEEL SHEET AND METHOD FOR PRODUCING SAME

TEMPERED AND COATED STEEL SHEET HAVING EXCELLENT FORMABILITY AND A METHOD OF MANUFACTURING THE SAME

HOT-STAMPED ARTICLE

A hot stamped body comprising a steel base material and an Al-Zn-Mg-based plating layer formed on a surface of the steel base material, wherein the plating layer has a predetermined chemical composition, the plating layer comprises an interfacial layer positioned at an interface with the steel base material and containing Fe and Al and a main layer positioned on the interfacial layer, the main layer comprises, by area ratio, 10.0 to 90.0% of an Mg-Zn containing phase, 5.0 to less than 30.0% of an Fe-Al containing phase, and 2.0 to 25.0% of an Al-Si containing oxide phase, the Mg-Zn containing phase comprises at least one selected from the group consisting of an MgZn phase, Mg2Zn3 phase, and MgZn2 phase, and the Fe-Al containing phase comprises at least one of an FeAl phase and Fe-Al-Zn phase.

HOT STAMPED COMPONENT, PRE-COATED STEEL PLATE FOR HOT STAMPING, AND HOT STAMPING PROCESS

The present invention relates to a hot stamped component, a precoated steel sheet used for hot stamping, and a hot stamping process. The hot stamped component of the present invention is provided with a coating of aluminium or an aluminium alloy on at least one surface of the base steel, the coating is produced by interdiffusion between the base steel and a precoating of aluminium or aluminium alloy, and the coating has a thickness of 6 to 26 µm.

ALUMINUM ALLOY-PLATED STEEL SHEET HAVING EXCELLENT WORKABILITY AND CORROSION RESISTANCE AND METHOD FOR MANUFACTURING SAME

The present invention relates to an aluminum alloy-plated steel sheet having excellent workability and corrosion resistance and a method for manufacturing same and, more specifically, to an aluminum alloy-plated steel sheet which prevents the generation of microcracks, which are generated upon hot forming, and is superb in terms of seizure and corrosion resistance, and a manufacturing method therefor.

COATED STEEL MEMBER, COATED STEEL SHEET, AND METHODS FOR PRODUCING SAME

COATED STEEL SHEET AND HIGH STRENGTH PRESS HARDENED STEEL PART AND METHOD OF MANUFACTURING THE SAME

HIGH-STRENGTH COLD-ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME

A high-strength cold-rolled steel sheet having a high yield ratio and excellent stretch flangeability and a method for manufacturing the steel sheet. The high-strength cold-rolled steel sheet has a chemical composition including, by mass %, C: 0.10 to 0.30%, Si: 0.50 to 2.00%, Mn: 2.5 to 4.0%, P: 0.050% or less, S: 0.020% or less, Al: 0.10% or less, N: 0.01% or less, Ti: 0.100% or less, and B: 0.0003 to 0.0030%, with the balance being Fe and incidental impurities. N and Ti satisfy a specified formula, and the total area fraction of martensite and bainite is 95% or more. The number density of bainite grains having an area of 3 μm2or more and a carbon concentration of less than 0.7C is 1200 grains/mm2or less.

HOT PRESS-FORMED PART, AND MANUFACTURING METHOD THEREOF

STEEL SHEET FOR HOT PRESS FORMED MEMBER HAVING EXCELLENT PLATING ADHESION, AND METHOD FOR MANUFACTURING SAME

HIGH-STRENGTH HOT-DIP ZINC-COATED STEEL SHEET

HOT-DIPPED Zn-Al-Mg-BASED PLATED STEEL

This hot-dip Zn—Al—Mg-based plated steel includes: a steel; and a plating layer formed on a surface of the steel, in which the plating layer contains, as an average composition, Mg: 1 to 10 mass %, Al: 4 to 22 mass %, and a remainder consisting of Zn and impurities, the plating layer includes an (Al—Zn mixed structure) in an area ratio of 10% to 70% in a cross section of the plating layer in a matrix of an (Al/Zn/MgZn2ternary eutectic structure), the (Al—Zn mixed structure) includes a first region that has a Zn concentration in a range of 75 mass % or more and less than 85 mass % and a second region that is present inside the first region and has a Zn concentration in a range of 67 mass % or more and less than 75 mass %, and an area ratio of the second region in the (Al—Zn mixed structure) in the cross section of the plating layer is more than 0% and 40% or less.

ADVANCED HIGH STRENGTH ZINC PLATED STEEL SHEET HAVING EXCELLENT SURFACE QUALITY AND ELECTRICAL RESISTANCE SPOT WELDABILITY AND MANUFACTURING METHOD THEREOF

The present invention relates to a high-strength hot-dip galvanized steel sheet with excellent surface quality and electric resistance spot weldability, and a method for manufacturing same. A galvanized steel sheet, according to one aspect of the present invention, is a galvanized steel sheet comprising a base steel sheet and a zinc-based plated layer formed on the surface of the base steel sheet, wherein the ratio (a/b) of surface hardness (a) to internal hardness (b) of the base steel sheet may be less than 0.95.

HIGH-STRENGTH HOT-DIP GALVANIZED STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME

TEMPERED AND COATED STEEL SHEET HAVING EXCELLENT FORMABILITY AND A METHOD OF MANUFACTURING THE SAME

FE-AL PLATED HOT-STAMPED MEMBER AND METHOD FOR PRODUCING FE-AL PLATED HOT-STAMPED MEMBER

HOT PRESS-FORMED PART, AND MANUFACTURING METHOD THEREOF

The present invention provides a hot-press formed part comprising a plated steel plate and an aluminum alloy plated layer formed on the plated steel plate, wherein the aluminum alloy plated layer comprises: an alloying layer (I) formed on the plated steel plate and containing, by weight%, 5-30% of Al; an alloying layer (II) formed on the alloying layer (I) and containing, by weight%, 30 to 60% of Al; an alloying layer (III) formed on the alloying layer (II) and containing, by weight%, 20-50% of Al and 5-20% of Sl; and an alloying layer (IV) formed continuously or discontinuously on at least a part of the surface of the alloying layer (III), and containing 30-60% of Al, wherein the rate of the alloying layer (III) exposed on the outermost surface of the aluminum alloy plated layer is 10% or more.

Coated steel product

A coated steel product including a base steel, and a coating layer containing a Zn—Al—Mg alloy layer disposed on a surface of the base steel, in which the coating layer has a predetermined chemical composition, the coated steel product including dendrite-shaped MgZn2phase having a surface roughness Sa of 50 nm or less on a surface of the Zn—Al—Mg alloy layer, an area ratio of the dendrite-shaped MgZn2phase having a surface roughness Sa of 50 nm or less being from 30% to 80% within a region of an observable field of view of 5 mm2, and among the dendrite-shaped MgZn2phase having a surface roughness Sa of 50 nm or less, a number of dendrite-shaped MgZn2phase having an area of 0.1 mm2or more being from 5 to 100 within a region of an observable field of view of 25 mm2.

METHOD FOR PRODUCING SUCH A COMPONENT MADE OF PRESS-FORM-HARDENED, ALUMINUM-BASED COATED STEEL SHEET

FILTRATION SYSTEM

A cooling method of a travelling coated steel strip, exiting a hot-dip coating bath, including the steps of A) sucking a gas into a cooling device, B) filtering the sucked gas by a filtering system capturing at least 50% of the particles having a size of at least 2.5 µm, C) blowing, at a velocity comprised from 1 to 80 m.s-1, the sucked and filtered gas onto the coated steel strip.

HOT DIP GALVANIZED STEEL SHEET AND METHOD FOR PRODUCING SAME

HOT-DIP Zn-Al-Mg-BASED ALLOY-PLATED STEEL MATERIAL HAVING EXCELLENT CORROSION RESISTANCE OF PROCESSED PORTION, AND METHOD FOR MANUFACTURING SAME

An exemplary embodiment in the present disclosure provides a hot-dip Zn—Al—Mg-based alloy-plated steel material having excellent corrosion resistance in a processed portion, and a method for manufacturing the same. The steel material includes: an iron substrate; and a hot-dip alloy-plated layer formed on the iron substrate, wherein the hot-dip alloy-plated layer contains, by wt %, more than 8% to 25% of Al, more than 4% to 12% of Mg, and a balance of Zn and inevitable impurities, a fraction of a MgZn2 phase in the hot-dip alloy-plated layer is 10 to 45 area %, cracks are formed inside the MgZn2 phase, and the number of cracks present per 100 μm in a direction perpendicular to a thickness direction of a steel sheet in a field of view in which the cracks are observed based on a cross section in the thickness direction of the steel sheet is 3 to 80.

METHOD FOR PRODUCING A COATED STEEL FLAT PRODUCT, METHOD FOR PRODUCING A STEEL COMPONENT AND COATED STEEL FLAT PRODUCT II

HOT-DIP ZINC-BASED PLATED STEEL SHEET

A PRESS HARDENING METHOD

COATED STEEL SHEET AND HIGH STRENGTH PRESS HARDENED STEEL PART AND METHOD OF MANUFACTURING THE SAME

HIGH-STRENGTH STEEL SHEET HAVING EXCELLENT MOLDABILITY AND IMPACT RESISTANCE, AND METHOD FOR MANUFACTURING HIGH-STRENGTH STEEL SHEET HAVING EXCELLENT MOLDABILITY AND IMPACT RESISTANCE

PLATED STEEL SHEET HAVING EXCELLENT CORROSION RESISTANCE, GALLING RESISTANCE, WORKABILITY AND SURFACE PROPERTY AND METHOD FOR MANUFACTURING

Provided are a plated steel sheet and a method for manufacturing same, the plated steel sheet comprising: a base steel sheet; a Zn—Mg—Al plating layer provided on at least one surface of the base steel sheet; and an Fe—Al inhibition layer provided between the base steel sheet and the Zn—Mg—Al plating layer. The plating layer comprises, by weight %, 4 to 10% of Mg and 5.1-25% of Al and the remainder being Zn and unavoidable impurities with respect to components not including iron (Fe) diffused from the base steel sheet. The plating layer comprises a 24-50% MgZn2phase in phase fraction. In the MgZn2phase, an Al single phase is present in the ratio of 1-30% relative to the cross-sectional area of the total MgZn2phase.

COATED STEEL PRODUCT

A coated steel product including a base steel, and a coating layer containing a Zn—Al—Mg alloy layer disposed on a surface of the base steel, in which the coating layer has a predetermined chemical composition, the coated steel product including dendrite-shaped MgZn2phase having a surface roughness Sa of 50 nm or less on a surface of the Zn—Al—Mg alloy layer, an area ratio of the dendrite-shaped MgZn2phase having a surface roughness Sa of 50 nm or less being from 30% to 80% within a region of an observable field of view of 5 mm2, and among the dendrite-shaped MgZn2phase having a surface roughness Sa of 50 nm or less, a number of dendrite-shaped MgZn2phase having an area of 0.1 mm2or more being from 5 to 100 within a region of an observable field of view of 25 mm2.

Aluminum-based coating for flat steel products for press mold hardening components, and method for producing same

An aluminum-based coating of a flat steel product is applied in a hot-dipping method and comprises a mass percentage of silicon within a given range. The coating for a flat steel product, in particular for press mold hardening components, offers a shortened required minimum oven dwell time and a sufficiently large processing window when heating in an oven. This is achieved in that the surface of the coating has a degree of absorption for thermal radiation ranging between 0.35 and 0.95 prior to an annealing treatment, where the degree of absorption relates to an oven temperature ranging from 880 to 950° C. during the austenitizing annealing treatment. The invention additionally relates to an improved method for producing a flat steel product with an aluminum-based coating, to an inexpensive method for producing press-hardened components from such flat steel products, and to a press-hardened component made of such flat steel products.

GALVANIZED STEEL SHEET, MEMBER, AND METHOD FOR PRODUCING THEM

A galvanized steel sheet includes: a steel sheet having a chemical composition satisfying an equivalent carbon content Ceq of 0.35% or more and less than 0.60%, and a specified steel microstructure; and a galvanized layer on a surface of the steel sheet. The retained austenite has a solute C content of 0.6% or more by mass, and retained austenite grains with an aspect ratio of less than 2.0 constitute 50% or more of all retained austenite grains. In 90-degree bending at a curvature radius/thickness ratio of 4.2 in a rolling (L) direction with respect to an axis extending in a width (C) direction, an L cross section in a 0 to 50 μm region from a surface of the steel sheet on a compression side has a number density of voids of 1000/mm2or less, and the galvanized steel sheet has a tensile strength of 590 MPa or more.

HIGH-STRENGTH COLD-ROLLED STEEL SHEET, HOT-DIPPED GALVANIZED STEEL SHEET, ALLOYED HOT-DIPPED GALVANIZED STEEL SHEET, AND METHODS FOR PRODUCING OF THESE

A high-strength cold-rolled steel sheet according to one aspect of the present invention contains, in % by mass: C: 0.070 to 0.140%; Si: 0.80 to 1.80%; and Mn: 1.80 to 2.80%, with the balance being iron and unavoidable impurities; in area ratio in a structure observed with a scanning electron microscope, bainite, tempered martensite, and hard phases composed of at least one of cementite and MA made up of quenched martensite and retained austenite combined together account for 85% or more in total, the hard phase that has a breadth of 0.4 μm or less and a length of 1.2 μm or more accounts for 0.5% or more, the hard phase that has a breadth of 1.2 μm or more accounts for 5.0% or less, and structures other than the bainite, the tempered martensite, and the hard phase account for 15% or less; and in volume ratio measured by X-ray diffractometry, retained austenite accounts for 3.0% or more and 7.0% or less.

PLATED STEEL MATERIAL

A plated steel material comprising a steel base material and an Al—Zn—Mg-based plating layer formed on a surface of the steel base material, wherein the plating layer has a predetermined chemical composition, and in a surface structure of the plating layer, there is, by area ratio, 2.0% or more of an acicular Al—Zn—Si—Ca phase.

Metal-coated steel strip

An Al—Zn—Si—Mg alloy coated strip that has Mg2Si particles in the coating microstructure is disclosed. The distribution of Mg2Si particles is such that the surface of the coating has only a small proportion of Mg2Si particles or is at least substantially free of any Mg2Si particles.

Methods and Systems for Fabricating Layers of Metallic Glass-Based Materials

Systems and methods of fabricating layers of metallic glass are described. Many embodiments provide conduction quenching processes to form a metallic glass coating. In many embodiments, the systems and methods comprise applying a metallic glass forming material to form a layer on at least a portion of an object, heating up the layer of metallic glass forming alloy, and cooling the layer of metallic glass-based material to form a layer of solid phase metallic glass.

DEVICE FOR SOLIDIFYING A COATING LAYER HOT-DEPOSITED ON A WIRE,CORRESPONDING INSTALLATION AND METHOD

Device for solidifying a coating layer hot deposited on a wire, corresponding installation and method. The device comprises a cooling liquid injection chamber with a liquid inlet and a wire inlet, a cooling chamber with a liquid outlet and a wire outlet, and a partition arranged between the injection and cooling chambers, comprising a wire passage. It also has a conduit for separating the wire. The partition comprises channels fluidically connecting the injection chamber with the cooling chamber and leading into the center of the wire passage in an eccentric manner and being inclined forming an angle (α) with respect to a longitudinal direction. This directs a jet of cooling liquid on the wire in the direction from the injection chamber towards the cooling chamber.

Bent metal member and a method for its manufacture

A bent metal member which is obtained by bending accompanied by heat treatment of a zinc-based coated metal material and which is suitable for use in components of automobiles due to having a high strength and excellent post-painting corrosion resistance is manufactured. The outer surface of a tubular metal material having on its surface a Zn—Fe alloy coating layer with a coating weight of 30-90 g/m 2 per side, an Fe content of 8-20%, and a surface roughness Ra of at most 0.8 μm is supported at two locations spaced in the axial direction of the metal material so that the material can move in its axial direction, the metal material is heated between the two locations to a temperature range of at least the Ac 3 point at a heating speed such that the rate of temperature increase is at least 3.0×10 2 ° C. per second while feeding the metal material in its axial direction, holding so that the length of time for which the surface of the metal material is at 8.0×10 2 ° C. or higher is at most 2 seconds, then rapid cooling is carried out, and the position of the downstream of the two locations in the feed direction of the metal material is two-dimensionally or three-dimensionally varied to impart a bending moment to the heated portion of the metal material. A bent metal member having a Zn-based layer which contains an η phase and which has a coating weight of 30-90 g/m 2 per side, an Fe content of 8-35%, 35%, and a surface roughness Ra of at most 2.0 μm can be manufactured.

Hot dip galvannealed steel sheet and method for producing the same

Exemplary embodiments of the present invention can provide a hot dip galvannealed steel sheet which has excellent corrosion resistance, workability, coatability and appearance. The exemplary galvannealed sheet can include an ultra-low carbon steel sheet having a plating layer which includes about 8 to 13% Fe, about 0.05 to 1.0% Ni, about 0.15 to 1.5% Al, and a balance of Zn and unavoidable impurities. An exemplary method for producing a hot dip galvannealed steel sheet is also provided which can include cleaning an annealed ultra-low carbon steel sheet, preplating it with Ni, rapidly heating the sheet in a nonoxidizing or reducing atmosphere, plating the sheet in a galvanization bath containing Al, wiping it, then rapidly reheating it and either cooling the sheet without any soaking time or soaking and holding it for less than 15 seconds and then cooling it.

Hot-dip galvanized steel sheet and manufacturing method thereof

A hot-dip galvanized steel sheet includes a steel sheet and a hot-dip galvanized layer arranged on the steel sheet, in which the Si content and the Al content by mass % of components of the steel sheet satisfy a relationship 0.5<Si+Al<1.0, and a metallographic structure of the steel sheet satisfies a relationship of {(n 2 ) 2/3 ×d 2 }/{(n 1 ) 2/3 ×d 1 }×ln(H 2 /H 1 )<0.3 when the n 1 is the number of a MnS of a surface portion of the steel sheet, the d 1 μm is an average equivalent circle diameter of the MnS in the surface portion of the steel sheet, the H 1 GPa is a hardness of a martensite of the surface portion of the steel sheet, the n 2 is the number of the MnS of a center portion of the steel sheet, the d 2 μm is an average equivalent circle diameter of the MnS in the center portion of the steel sheet, and the H 2 GPa is the hardness of the martensite of the center portion of the steel sheet.

Method for producing hardened structural elements

The invention relates to a method for producing a hardened steel component with a coating composed of zinc or a zinc alloy; a blank is stamped out of a sheet coated with the zinc or zinc alloy, the stamped-out blank is heated to a temperature ≧Ac3 and if need be, kept at this temperature for a predetermined time in order to induce the formation of austenite, and then the heated blank is transferred to a forming die, is formed in the forming die, and is cooled at a speed that is greater than the critical hardening speed and thus hardened; the steel material is adjusted in a transformation-delaying fashion so that a quench hardening through transformation of austenite into martensite takes place at a forming temperature that lies in the range from 450° C. to 700° C.; after the heating and before the forming, an active cooling takes place at >15K/s.

Method for producing hardened components with regions of different hardness and/or ductility

The invention relates to a method for producing a hardened, steel component with regions of different hardness and/or ductility; a blank is stamped out and either heated in some regions to a temperature ≧Ac 3 , and then transferred to a forming die, is formed, and is cooled at a speed that is greater than the critical hardening speed and thus hardened or is cold formed into the finished shape and the formed blank is heated in some regions to a temperature >Ac 3 and then transferred to a hardening die and is hardened at a speed greater than the critical hardening speed; the steel material is adjusted in a transformation-delaying fashion so that a quench hardening through transformation of austenite into martensite takes place at a forming temperature that lies in the range from 450° C. to 700° C.; after the heating and before the forming, an active cooling takes place at >15 K/s.

Flat Steel Product and Method for Producing a Flat Steel Product

A flat steel product, intended to be formed into a component by hot press forming and having a base made of steel, onto which a metal anti-corrosion coating of a Zn or a Zn alloy is applied. A separate finishing coat is applied to at least one of the free surfaces of the flat steel product. The finishing coat includes at least one base metal compound (oxide, nitride, sulphide, sulphate, carbide, carbonate, fluoride, hydrate, hydroxide, or phosphate). Also, a method enabling the production of a flat steel product of this kind.

Microcrack-reduced, hot press-formed article, and method for manufacturing same

Provided are a hot press-formed article and a method for manufacturing the same. The article is manufactured by hot press forming a galvanized steel sheet comprising a base steel plate and a zinc-based coat layer formed on a surface of the base steel plate, wherein the zinc-based coat layer contains at least one element selected from the group consisting of Sb, Sn, and Bi in a total amount of 0.05% to 2.0% by weight, and a balanced amount of Zn and inevitable impurities, at least 70% by weight of the at least one element selected from the group consisting of Sb, Sn, Bi being concentrated in a region 3 μm or less distant from the surface of an alloyed zinc-based coat layer, formed by alloying the zinc-based coat layer, of the hot press-formed article.

Manufacturing method of aluminum-based alloy plated steel

The present disclosure relates to an aluminum-based plated steel that is provided for vehicles by hot forming, an aluminum-based alloy plated steel manufactured using the same, and method of manufacturing thereof.

High-strength hot-dip galvannealed steel sheet and method for producing same

A method for producing a high-strength hot-dip galvannealed steel sheet, in which a high-strength steel sheet is used as a base material, includes a rolling step (x) of rolling a hot-dip galvannealed steel sheet with a coating layer having an Fe concentration of 8% to 17% by mass, and a heat treatment step (y) of heating the coated steel sheet which has been subjected to the rolling step (x) under the conditions satisfying the following formulae (1) and (2):(273+T)×(20+2×log10(t))≥8000  (1)40≤T≤160  (2)where T: heating temperature (° C.) of the coated steel sheet, and t: holding time (hr) at the heating temperature T.

Zinc alloy-plated steel having excellent corrosion resistance and surface smoothness, and manufacturing method therefor

Provided is a plated steel to be used for automobiles, electric home appliances, building materials and the like and, more specifically, to a zinc alloy-plated steel having excellent corrosion resistance and surface smoothness, and a method for manufacturing the same.

High-strength galvanized steel sheet and method for producing the same

Provided are a high-strength galvanized steel sheet having excellent delayed fracture resistance by reducing the diffusible hydrogen content in the steel and a method for producing the same. The high-strength galvanized steel sheet includes a steel sheet having a prescribed composition and a microstructure including martensite and tempered martensite, the total area fraction of the martensite and the tempered martensite being 30% or more, and a galvanizing layer formed on the surface of the steel sheet. The diffusible hydrogen content in the high-strength galvanized steel sheet is 0.50 wt. ppm or less. The half-width of the hydrogen release peak of the high-strength galvanized steel sheet is 70° C. or less. The diffusible hydrogen content and the half-width of the hydrogen release peak are determined by a prescribed analysis method.

HOT-DIP Al ALLOY COATED STEEL SHEET AND METHOD OF PRODUCING SAME

To provide a hot-dip Al alloy coated steel sheet which is excellent in post-painting corrosion resistance and post-working corrosion resistance. Disclosed is a hot-dip Al alloy coated steel sheet comprising a coating formed by a coating layer and an interfacial alloy layer present at an interface between the coating layer and a base steel sheet, in which the interfacial alloy layer contains Mn, and the coating layer contains Mg 2 Si having a major axis length of 5 μm or more.

Press-formed article and method for manufacturing same

A method for manufacturing a press-formed article, said method comprising forming a galvanized steel sheet or an alloyed hot-dip galvanized steel sheet by hot press forming, wherein, after heating the steel sheet and holding the same, the forming is started at a temperature of 680-750° C. inclusive, while allowing liquid zinc to remain on the surface of the steel sheet, and the forming is performed while regulating the strain rate in a plastic deformation part of the steel sheet to 0.5 sec −1 or lower.

Fe-BASED METAL PLATE AND METHOD OF MANUFACTURING THE SAME

On at least one surface of a base metal plate ( 1 ) of an α-γ transforming Fe or Fe alloy, a metal layer ( 2 ) containing ferrite former is formed. Next, the base metal plate ( 1 ) and the metal layer ( 2 ) are heated to an A3 point of the Fe or the Fe alloy, whereby the ferrite former are diffused into the base metal plate ( 1 ) to form an alloy region ( 1 b ) in a ferrite phase in which an accumulation degree of {200} planes is 25% or more and an accumulation degree of {222} planes is 40% or less. Next, the base metal plate ( 1 ) is heated to a temperature higher than the A3 point of the Fe or the Fe alloy, whereby the accumulation degree of the {200} planes is increased and the accumulation degree of the {222} planes is decreased while the alloy region ( 11 b ) is maintained in the ferrite phase.

Apparatus for cooling metal material

Provided is an apparatus for cooling a metal material, the apparatus comprising: a spray cooling unit for spraying a cooling medium onto the surface of a metal material; and a spray amount control unit which regulates the rate of passage of the cooling medium sprayed from the spray cooling unit onto the edge region of the metal material, and controls the spray amount of the cooling medium.

Hot-stamped steel, cold-rolled steel sheet and method for producing hot-stamped steel

A hot-stamped steel according to the present invention has a predetermined chemical composition, satisfies (5×[Si]+[Mn])/[C]>10 when [C] is the amount of C by mass %, [Si] is the amount of Si by mass %, and [Mn] is the amount of Mn by mass %, includes 40% to 95% ferrite and 5% to 60% martensite in area fraction, and optionally further includes 10% or less pearlite in area fraction, 5% or less retained austenite in volume fraction, and less than 40% bainite in area fraction. The total of the area fraction of ferrite and the area fraction of martensite is 60% or more, the hardness of martensite measured with a nanoindenter satisfies H 2 /H 1 <1.10 and σHM<20, and TS×λ which is product of tensile strength TS and hole expansion ratio λ is 50000 MPa·% or more.

Al-BASED ALLOY PLATED STEEL MATERIAL HAVING EXCELLENT POST-COATING CORROSION RESISTANCE

An Al-based alloy plated steel material includes: a steel material and a coating layer formed on a surface of the steel material, wherein the coating layer includes an Al-based alloy plating layer containing, in mass %, not less than 10% nor more than 50% Fe and not less than 3% nor more than 15% Si, and formed on the surface of the steel material; a layer containing ZnO and formed above a surface of the Al alloy plating layer; and a ZnAl 2 O 4 layer with a thickness of not less than 0.05 μm nor more than 2 μm, formed between the Al alloy plating layer and the layer containing ZnO.

Steel sheet hot-dip plated with zinc based layer with superior bake hardenability and aging resistance, and manufacturing method thereof

Provided are a cold-rolled steel sheet having excellent bake hardenability and aging resistance, and manufacturing method thereof. The cold-rolled steel sheet comprises, by weight, 0.02 to 0.08% of carbon (C), 1.3 to 2.1% of manganese (Mn), 0.3% or less (excluding 0%) of silicon (Si), 1.0% or less (excluding 0%) of chromium (Cr), 0.1% or less (excluding 0%) of phosphorus (P), 0.01% or less (excluding 0%) of sulfur (S), 0.01% or less (excluding 0%) of nitrogen (N), and 0.01 to 0.06% of acid soluble aluminum (sol.Al), comprises one or more selected from the group consisting of 0.2% or less (excluding 0%) of molybdenum (Mo) and 0.003% or less (excluding 0%) of boron (B), and comprises a remainder of iron (Fe) and unavoidable impurities, and comprises, by area, 90 to 99% of ferrite and 1 to 10% of martensite as a microstructure.

High-Strength Hot-Dip Galvanized Steel Sheet Excellent in Impact Resistance Property and Manufacturing Method Thereof, and High-Strength Alloyed Hot-Dip Galvanized Steel Sheet and Manufacturing Method Thereof

A base steel sheet has a hot-dip galvanized layer formed on a surface thereof, in which, in a steel sheet structure in a range of ⅛ thickness to ⅜ thickness centered around ¼ thickness of a sheet thickness from a surface, a volume fraction of a retained austenite phase is 5% or less, and a total volume fraction of phases of bainite, bainitic ferrite, fresh martensite, and tempered martensite is 40% or more, an average effective crystal grain diameter is 5.0 μm or less, a maximum effective crystal grain diameter is 20 μm or less, and a decarburized layer with a thickness of 0.01 μm to 10.0 μm is formed on a surface layer portion, in which a density of oxides dispersed in the decarburized layer is 1.0×10 12 to 1.0×10 16 oxides/m 2 , and an average grain diameter of the oxides is 500 nm or less.

Plated steel sheet for hot press forming having excellent impact property, hot press formed part, and manufacturing method thereof

Provided is a plated steel sheet for hot press forming, having an excellent impact property, including: a base steel sheet comprising, by wt %, 0.15-0.4% of C, 0.05-1.0% of Si, 0.6-3.0% of Mn, 0.001-0.05% of P, 0.0001-0.02% of S, 0.01-0.1% of Al, 0.001-0.02% of N, 0.001-0.01% of B, 0.01-0.5% of Cr, 0.01-0.05% of Ti, and the balance of Fe and inevitable impurities; and an Al—Si plated layer formed on the surface of the base steel sheet. A thickness of a carbon-depleted layer in a surface layer part of the base steel sheet is 5 μm or less. The surface layer part means a region from the surface of the base steel sheet to a depth of 200 μm, and the carbon-depleted layer means a region which the carbon content is 50% or less of an average carbon amount (C0) of the base steel sheet.

Method and an arrangement for manufacturing a hot dip galvanized rolled high strength steel product

A method and arrangement for manufacturing hot dip galvanized rolled high strength steel product is presented. The method comprises providing a rolled steel product, heating and annealing the rolled steel product for creating a layer of iron oxide on the surface of the rolled steel product, cooling the rolled steel product, having the iron oxide layer, in a first cooling step to a temperature in a temperature range of 560-600° C. and holding for 3-10 seconds, quenching said rolled steel product, covered with the layer of iron oxide, in a second cooling step by immersing it into a zinc bath comprising aluminium and having a temperature between 440-450° C. for 1-5 seconds and cooling the rolled steel product in a third cooling step to room temperature. An arrangement for implementing the method is also presented.

Al or al alloy-coated stainless steel sheet and method of manufacturing ferritic stainless steel sheet

Provided is an Al or Al alloy-coated stainless steel sheet having a coating substrate and a hot-dip Al or Al alloy coated layer provided on a surface of the coating substrate, the coating substrate having a predetermined chemical composition, the Mo content and W content of the chemical composition of the coating substrate, the thickness of the coating substrate, and the thickness of the hot-dip Al or Al alloy coated layer satisfying predetermined relations.

Plated steel sheet for hot press forming having excellent impact property, hot press formed part, and manufacturing method thereof

Provided is a plated steel sheet for hot press forming, having an excellent impact property, including: a base steel sheet comprising, by wt %, 0.15-0.4% of C, 0.05-1.0% of Si, 0.6-3.0% of Mn, 0.001-0.05% of P, 0.0001-0.02% of S, 0.01-0.1% of Al, 0.001-0.02% of N, 0.001-0.01% of B, 0.01-0.5% of Cr, 0.01-0.05% of Ti, and the balance of Fe and inevitable impurities; and an Al—Si plated layer formed on the surface of the base steel sheet. A thickness of a carbon-depleted layer in a surface layer part of the base steel sheet is 5 μm or less. The surface layer part means a region from the surface of the base steel sheet to a depth of 200 μm, and the carbon-depleted layer means a region which the carbon content is 50% or less of an average carbon amount (C0) of the base steel sheet.

Multiphase, cold-rolled ultra-high strength steel

A cold-rolled ultra-high strength, multi-phase structured steel is disclosed with improved stamping and forming performance during manufacturing processes, while possessing one or more of the following properties: excellent castability and rollability, excellent galvanizability and/or coatability, excellent formability, excellent fracture resistance, excellent stretch formability and stretch flangeability, excellent dent resistance, excellent durability, excellent impact performance and structural performance, excellent intrusion and crash resistance, and excellent weldability, without the purposeful addition of boron.

High-strength galvannealed steel sheet having excellent formability and fatigue resistance and method for manufacturing the same

The present invention provides a high-strength galvanized steel sheet having excellent ductility, stretch flangeability, and fatigue resistance, and a method for manufacturing the same. A high-strength galvannealed steel sheet having excellent formability and fatigue resistance is characterized in that the steel sheet is composed of steel having a composition containing, by % by mass, C: 0.05% to 0.3%, Si: 0.5% to 2.5%, Mn: 1.0% to 3.5%, P: 0.003% to 0.100%, S: 0.02% or less, Al: 0.010% to 0.1%, and the balance including iron and unavoidable impurities, and the steel sheet has a microstructure containing 50% or more of ferrite, 5% to 35% of martensite, and 2% to 15% of pearlite in terms of an area ratio, the martensite having an average gain size of 3 μm or less and an average distance of 5 μm or less between adjacent martensite grains.

Method for producing a high strength coated steel sheet having improved strength and ductility and obtained sheet

A method for producing a high strength coated steel sheet having a yield strength YS of at least 800 MPa, a tensile strength TS of >1180 MPa, a total elongation >14% and a hole expansion ratio HER>30%. The steel contains in weight %: 0.13%≦C≦0.22%, 1.2%≦Si≦1.8%, 1.8%≦Mn≦2.2%, 0.10%≦Mo≦0.20%, Nb≦0.05%, Al≦0.5%, the remainder being Fe and unavoidable impurities. The sheet is annealed at a temperature TA higher than Ac 3 but less than 1000° C. for more than 30 s, then quenched by cooling temperature QT between 325° C. and 375° C., at a cooling speed sufficient to obtain a structure consisting of austenite and at least 60% of martensite, the austenite content being such that the fmal structure can contain between 3% and 15% of residual austenite and between 85 and 97% of the sum of martensite and bainite, without ferrite, then heated to a partitioning temperature PT between 430° C. and 480° C. and maintained at this temperature for a partitioning time Pt between 10 s and 90 s, then hot dip coated cooled to the room temperature. Coated sheet obtained.

Hot stamped steel

A hot stamped steel includes a base material that is formed of steel, a plated layer that is formed on a surface of the base material, and a phosphate coating that is formed on a surface of the plated layer; chemical composition of the plated layer contains 20.00 to 45.00 mass % of Al, 10.00 to 45.00 mass % of Fe, 4.50 to 15.00 mass % of Mg, 0.10 to 3.00 mass % of Si, 0.05 to 3.00 mass % of Ca, 0 to 0.50 mass % of Sb, 0 to 0.50 mass % of Pb, 0 to 1.00 mass % of Cu, 0 to 1.00 mass % of Sn, 0 to 1.00 mass % of Ti, 0 to 0.50 mass % of Sr, 0 to 1.00 mass % of Cr, 0 to 1.00 mass % of Ni, and 0 to 1.00 mass % of Mn with a remainder of Zn and impurities; the phosphate coating consists of zinc phosphate crystals containing 5.0 to 50.0 mass % of Mg and 0.5 to 5.0 mass % of Ca; and the adhesion amount of the phosphate coating per one surface is in a range of 0.1 to 10.0 g/m2.

Steel, for Hot Forming or Quenching in a Tool, having Improved Ductility

The invention relates to a steel part, the composition of the steel of which comprises, the contents being expressed by weight: 0.040%≦C≦0.100%; 0.80%≦Mn≦2.00%; Si≦0.30%; S≦0.005%; P≦0.030%; 0.010%≦Al≦0.070%; 0.015%≦Nb≦0.100%; 0.030%≦Ti≦0.080%; N≦0.009%; Cu≦0.100%; Ni≦0.100%; Cr≦0.100%; Mo≦0.100%; and Ca≦0.006%, the balance of the composition consisting of iron and inevitable impurities resulting from the smelting, the microstructure of the steel consisting of at least 75% equiaxed ferrite, martensite in an amount not less than 5% but not exceeding 20%, and bainite in an amount not exceeding 10%.

Hot rolled coated steel sheet having high strength, high formability, excellent bake hardenability and method of manfuacturing same

A hot-rolled coated steel sheet including: in wt %, C: 0.05-0.14%, Si: 0.1-1.0%, Mn: 1.0-2.0%, P: 0.001-0.05%, S: 0.001-0.01%, AI: 0.01-0.1%, Cr: 0.005-1.0%, Ti: 0.005-0.13%, Nb: 0.005-0.03%, N: 0.001-0.01%, Fe residues, and other inevitable impurities; a mixed structure of ferrite and bainite as a main phase; and as a remaining structure, one or more selected from the group consisting of martensite, austenite, and phase martensite (MA), wherein a fraction of the ferrite and bainite is 95-99 area % and Equation 1 is satisfied. [Equation 1] FCO{110}<112>+FCO{112}<111>≥10 where, FCO{110}<112> and FCO{112}<111>, each representing an area fraction occupied by a structure having ac crystal orientation of {110}<112> and {112}<111>.

Method for Producing an Ultra High Strength Coated or Not Coated Steel Sheet and Obtained Sheet

A method for producing a cold rolled steel sheet having a tensile strength≧1470 MPa and a total elongation TE≧19%, the method comprising the steps of annealing at an annealing temperature AT≧Ac3 a non-treated steel sheet whose chemical composition contains in weight %: 0.34%≦C≦0.40%, 1.50%≦Mn≦2.30%, 1.50≦Si≦2.40%, 0%≦Cr≦0.7%, 0%≦Mo≦0.3%, 0.01%≦Al≦0.07%, the remainder being Fe and unavoidable impurities, quenching the annealed steel sheet by cooling it to a quenching temperature QT<Ms transformation point and between 150° C. and 250° C., and making a partitioning treatment by re-heating the quenched steel sheet to a partitioning temperature PT between 350° C. and 420° C. and maintaining the steel sheet at this temperature during a partitioning time Pt between 15 seconds and 250 seconds.

Hot-pressed member and method for manufacturing same, and cold-rolled steel sheet for hot pressing and method for manufacturing same

Disclosed is a hot-pressed member that can exhibit very high tensile strength after hot pressing as high as TS: 1780 MPa or more, and excellent resistance to resistance welding cracking by properly adjusting its chemical composition and its microstructure such that a prior austenite average grain size is 7.5 μm or less, a volume fraction of martensite is 95% or more, and at least 10 Nb-based and Ti-based precipitates having a grain size of less than 0.10 μm are present on average per 100 μm 2 of a cross section parallel to a thickness direction of the member within a range of 100 μm or less in the thickness direction from the surface of the member, and such that a B concentration in prior austenite grain boundaries is at least 3.0 times a B concentration at a position 5 nm away from the grain boundaries.

Hot-stamped steel

Hot-stamped steel includes: a base metal that is steel including a tempered portion having hardness corresponding to 85% or less of the highest quenching hardness, the highest quenching hardness being defined as a Vickers hardness at a depth position spaced away from a surface layer by ¼ times a sheet thickness in a case of performing water quenching after heating at a temperature equal to or higher than an A c3 point and retention for 30 minutes; and a Zn coating layer that is formed on the tempered portion of the base metal. The Zn coating layer includes a solid-solution layer including a solid-solution phase that contains Fe and Zn that is solid-soluted in Fe, and a lamella layer that includes the solid-solution phase and a capital gamma phase. In the Zn coating layer, an area ratio of the lamella layer is 30 to 100% and an area ratio of the solid-solution layer is 0 to 70%.

Hot-dip galvanized steel sheet and method for producing same

A high-strength hot-dip galvanized steel sheet has excellent workability, namely, excellent ductility and hole expansion formability, and high yield ratio. The steel sheet has a chemical composition containing by mass %: C: 0.05-0.15%; Si: 0.10-0.90%; Mn: 1.0-1.9%; P: 0.005-0.10%; S: 0.0050% or less; Al: 0.01-0.10%; N: 0.0050% or less; Nb: 0.010-0.100%; and the balance being Fe and incidental impurities, in which: the steel sheet has a complex phase that includes: ferrite having an average crystal grain size of 15 μm or less to at least 90% in volume fraction; martensite having an average crystal grain size of 3.0 μm or less to 0.5% or more and less than 5.0% in volume fraction; pearlite to 5.0% or less in volume fraction; and the balance being a phase generated at low temperature.

Galvanized steel sheet and method of manufacturing the same

A galvanized steel sheet includes a steel sheet and a plating layer on the surface of the steel sheet, in which the steel sheet includes, as a steel chemical composition, by mass %, C: 0.05 to 0.40%, Si: 0.5 to 3.0% and Mn: 1.5 to 3.0%, a microstructure of the steel sheet includes ferrite, bainite, by volume fraction, 30% or more of a tempered martensite, and 8% or more of an austenite, and tensile strength of the steel sheet is 980 MPa or more, and the plating layer includes an oxide including at least one chemical element selected from Si, Mn and Al, and when seen at a cross section including the steel sheet and the plating layer in a plate thickness direction, a projection area fraction of the oxide is 10% or more.

High-strength hot-dip galvanized steel sheet having excellent delayed fracture resistance and manufacturing method thereof

A hot-dip galvanizing layer or an alloyed hot dip galvanizing layer is formed on the surface of a base steel sheet in which in volume fraction, 40 to 90% of a ferrite phase and 5% or less of a retained austenite phase are contained, and a ratio of non-recrystallized ferrite to the entire ferrite phase is 50% or less in volume fraction, and further a grain diameter ratio being a value of, of crystal grains in the ferrite phase, an average grain diameter in the rolling direction divided by an average grain diameter in the sheet width direction is 0.75 to 1.33, a length ratio being a value of, of hard structures dispersed in island shapes, an average length in the rolling direction divided by an average length in the sheet width direction is 0.75 to 1.33, and an average aspect ratio of inclusions is 5.0 or less.

Modified hot-dip galvanize coatings with low liquidus temperature, methods of making and using the same

The present invention relates to a coated substrate material. The substrate can be a steel alloy and the microstructure in the steel alloy can be altered with a low temperature coating process. The present invention also relates to a method to coat the substrate at the low temperature. The present invention also relates to a coating wherein the melting temperature of the coating is reduced with a dopant compared to the melting temperature without the dopant. The present invention also relates to a method to make the coating with the dopant.

Multipurpose Processing Line for Heat Treating and Hot Dip Coating a Steel Strip

A multipurpose continuous processing line able for heat treating and hot dip coating a steel strip comprising: —an annealing section ( 1 ) for heating the steel strip to a predetermined annealing temperature and for maintaining the steel strip at said annealing temperature, —a first transfer section ( 2 ), —an overaging section ( 3 ) able to maintain the temperature of the steel strip between 300° C. and 700° C., —a second transfer section ( 4 ) able to adjust the temperature of the steel strip to allow the hot dip coating of the strip and, —a hot dip coating section ( 5 ), wherein the first transfer section ( 2 ) comprises, in sequence, cooling means ( 21 ) and heating means ( 22 ).

Method of producing metal-coated steel strip

A method of forming a coating of an Al—Zn—Si—Mg alloy on a steel strip to form an Al—Zn—Mg—Si coated steel strip is disclosed. The method includes the steps of dipping steel strip into a bath of molten Al—Zn—Si—Mg alloy and forming a coating of the alloy on exposed surfaces of the steel strip and cooling the coated strip with cooling water. The cooling step includes controlling the pH of cooling water to be in a range of pH 5-9. Particular embodiments focus on Al—Zn—Si—Mg alloys that contain the following elements in % by weight: Zn: 2 to 19, Si: 0.01 to 2, Mg: 1 to 10, and Balance Al and unavoidable impurities.

MOLTEN Zn-BASED PLATED STEEL SHEET HAVING SUPERIOR CORROSION RESISTANCE AFTER BEING COATED

A hot-dip galvanized steel sheet includes a plated layer formed on at least a part of a surface of a steel sheet, the plated layer containing: Al in a range from 10 mass % to 40 mass %; Si in a range from 0.05 mass % to 4 mass %; Mg in a range from 0.5 mass % to 4 mass %; and the balance consisting of Zn and inevitable impurities. The plated layer has a lamellar structure in which a layered Zn phase and a layered Al phase are alternately arranged in a cross section of the plated layer, the lamellar structure accounting for 5% or more by an area fraction in the cross section, and a total abundance ratio of an intermetallic compound containing at least one of Fe, Mn, Ti, Sn, In, Bi, Pb or B is regulated to 3% or less by the area fraction.

High elongation press hardened steel and manufacture of the same

The residual ductility of currently available press hardened steel is approximately six percent. This characteristic of the material is primarily due to the fully martensitic microstructure in the hot stamped condition. The present alloys and processing improve the residual ductility of steels for use in press hardening applications. A series of specialized heat treatments were applied to a variety of new alloys to obtain higher residual ductility and a significant volume fraction of retained austenite in the as-hot stamped microstructure.

High-strength galvanized steel sheet and method for producing the same

Provided are a high-strength galvanized steel sheet and a method for producing the high-strength galvanized steel sheet. The high-strength galvanized steel sheet includes a base steel sheet having a specific composition and a microstructure including ferrite and carbide-free bainite, martensite and carbide-containing bainite, and retained austenite, the total area fraction of ferrite and carbide-free bainite being 0% to 65%, the total area fraction of martensite and carbide-containing bainite being 35% to 100%, and the area fraction of retained austenite being 0% to 15%, the content of diffusible hydrogen in the base steel sheet being 0.00008% by mass or less (including 0%) and a galvanizing layer disposed on the base steel sheet. The density of gaps in the galvanizing layer, that the gaps cutting across the entire thickness of the galvanizing layer, is 10 gaps/mm or more.

Zinc-plated steel sheet and manufacturing method thereof

A zinc-plated steel sheet of an aspect of the present invention includes a steel sheet having a predetermined chemical composition and a zinc-plated layer. In the steel sheet, steel microstructures in a range of ⅛ thickness to ⅜ thickness, having the center at ¼ thickness from a steel sheet surface, include, by vol %, ferrite: 0% to 10%, bainite: 0% to 20%, tempered martensite: 70% or more, fresh martensite: 0% to 10%, retained austenite: 0% to 10%, and pearlite: 0% to 5%. In the zinc-plated steel sheet, the amount of hydrogen emitted when the steel sheet is heated to 200° C. from a room temperature after removal of the zinc-plated layer is 0.40 ppm or less per mass of the steel sheet, the tensile strength is 1470 MPa or more, and no cracking occurs in a U-shape bending test where a stress equivalent to 1000 MPa is applied for 24 hours.

Method for the Manufacture of a Hardened Part which does not have LME Issues

The present invention provides a method for the manufacture of a hardened part. The method includes the provision of a steel sheet pre-coated with a metallic coating including from 2.0 to 24.0% by weight of zinc, from 1.1 to 7.0% by weight of silicon, optionally from 1.1 to 8.0% by weight of magnesium when the amount of silicon is between 1.1 and 4.0%, and optionally additional elements chosen from Pb, Ni, Zr, or Hf, the content by weight of each additional element being less than 0.3% by weight, the balance being aluminum and unavoidable impurities and residuals elements, wherein the ratio Al/Zn is above 2.9. The method further includes the cutting of the coated steel sheet to obtain a blank, the thermal treatment of the blank at a temperature between 840 and 950° C. to obtain a fully austenitic microstructure in the steel, the transfer of the blank into a press tool, the hot-forming of the blank to obtain a part, the cooling of the part in order to obtain a microstructure in steel being martensitic or martensitic-bainitic or made of at least 75% of equiaxed ferrite, from 5 to 20% of martensite and bainite in amount less than or equal to 10%.

Metal coated steel sheet, manufacturing method of hot-dip galvanized steel sheet, and manufacturing method of alloyed galvannealed steel sheet

In a metal coated steel sheet, a chemical composition contains, in mass %, at least C: 0.03% to 0.70%, Si: 0.25% to 2.50%, Mn: 1.00% to 5.00%, P: 0.100% or less, S: 0.010% or less, sol. Al: 0.001% to 2.500, N: 0.020% or less, and a balance composed of iron and impurities, a metal structure contains greater than 5.0 vol % of retained austenite and greater than 5.0 vol % of tempered martensite, and satisfies a C content in the retained austenite being 0.85 mass % or more.

Method of producing metal-coated steel strip

A method of forming a coating of an Al—Zn—Si—Mg alloy on a steel strip to form an Al—Zn—Mg—Si coated steel strip is disclosed. The method includes the steps of dipping steel strip into a bath of molten Al—Zn—Si—Mg alloy and forming a coating of the alloy on exposed surfaces of the steel strip and cooling the coated strip with cooling water. The cooling step includes controlling the pH of cooling water to be in a range of p H 5-9. Particular embodiments focus on Al—Zn—Si—Mg alloys that contain the following elements in % by weight: Zn: 30 to 60, Si: 0.3 to 3, Mg: 0.3 to 10, and Balance Al and unavoidable impurities.

Method for coating steel sheets or steel strips and method for producing press-hardened components therefrom

The invention relates to a method for coating a steel sheet or steel strip to which an aluminium-based coating is applied in a dip-coating process and the surface of the coating is freed of a naturally occurring aluminium oxide layer. In order to provide a low-cost method for coating steel sheets or steel strips that makes the steel sheets or steel strips outstandingly suitable for the production of components by means of press hardening and for the further processing thereof, it is proposed that transition metals or transition metal compounds are subsequently deposited on the freed surface of the coating to form a top layer. The invention also relates to a method for producing press-hardened components from the aforementioned steel sheets or steel strips with an aluminium-based coating.

High-strength steel sheet and method for manufacturing same

The present invention provides a high-strength steel sheet having a tensile strength of 980 MPa or more and also excellent bending property stably over the entire steel sheet, due to a predetermined chemical composition in combination with a specific microstructure wherein an average crystallized grain diameter of ferrite phase is 10 μm or less, a volume fraction of ferrite phase is within the range from 30% to 70%, a volume fraction of the total of martensite and retained austenite phases is 10% or less, and a ratio of interphases each having an interphase nano-hardness difference within 4 GPa is 90% or more.

Method and facility for producing high-strength galavanized steel sheets

A method for producing high-strength galvanized steel sheets having excellent coating adhesion, workability and appearance. The method comprises hot rolling a slab comprising, by mass %, C: 0.05 to 0.30%, Si: 0.1 to 2.0% and Mn: 1.0 to 4.0%, then coiling the steel sheet into a coil at a specific temperature T C , and pickling the steel sheet, cold rolling the hot-rolled steel sheet resulting from the hot rolling, annealing the cold-rolled steel sheet resulting from the cold rolling under specific conditions, and galvanizing the annealed sheet resulting from the annealing in a galvanizing bath containing 0.12 to 0.22 mass % Al.

High-strength hot-dip galvanized steel sheet and method for manufacturing the same (as amended)

A high-strength hot-dip galvanized steel sheet and a method for manufacturing the steel sheet are provided. The high-strength hot-dip galvanized steel sheet has a specific composition including C, Si, Mn, etc. In this chemical composition, the content of Ti [Ti] and the content of N [N] satisfy [Ti]>4[N]. The high-strength hot-dip galvanized steel sheet has a microstructure including martensite at an area fraction of 60% or more and 90% or less, polygonal ferrite at an area fraction of more than 5% and 40% or less, and retained austenite at an area fraction of less than 3% (including 0%). The average hardness of the martensite is 450 or more and 600 or less in terms of Vickers hardness, and the average crystal grain diameter of the martensite is 10 μm or less. The standard deviation of the crystal grain diameters of the martensite is 4.0 μm or less.

Galvanized steel sheet for hot forming

A galvanized steel sheet for hot forming, the galvanized steel sheet including a galvanized film provided on a surface of a steel sheet, wherein the steel sheet has a chemical composition consisting of, in mass %, C: 0.02% to 0.58%, Mn: 0.5% to 3.0%, sol. Al: 0.005% to 1.0%, a predetermined element(s) as necessary; Si: less than or equal to 2.0%, P: less than or equal to 0.03%, S: less than or equal to 0.004%, N: less than or equal to 0.01%, and the balance: Fe and impurities, wherein a content of Mn in a portion from an interface of the steel sheet and the galvanized film to a depth of 5 μm is more than or equal to 0.3 mass %, wherein the galvanized film has a plating coverage of 40 g/m 2 to 110 g/m 2 , an Al content of more than or equal to 150 mg/m 2 within the galvanized film, and an Al concentration of less than or equal to 0.5 mass %, and wherein the galvanized steel sheet is used for an application in which the galvanized steel sheet is heated to 700° C. or above and is then subjected to hot forming.

Automobile part and method for manufacturing automobile part

[Object] There are provided automobile parts and a method for manufacturing the automobile parts. The automobile parts have an excellent corrosion resistance after coated with a electrodeposition paint with smaller thickness, improve formability and productivity in hot pressing, and also improve chemical conversion treatability after hot press-forming. [Solution] An automobile part according to the present invention includes: a formed steel sheet having an intermetallic compound layer formed on a surface of the steel sheet, the intermetallic compound layer being formed of Al—Fe intermetallic compound having a thickness of 10 μm or more and 50 μm or less, the intermetallic compound layer including a diffusion layer positioned in closest proximity to the steel sheet, the diffusion layer having a thickness of 10 μm or less; a surface coating layer provided on a surface of the intermetallic compound layer, the surface coating layer including a coating containing ZnO and a zinc phosphate coating and having a surface roughness of 3 μm or more and 20 μm or less as a maximum profile height Rt in accordance with JIS B0601 (2001); and an electrodeposition paint film provided on a surface of the surface coating layer and having a thickness of 6 μm or more and less than 15 μm.

High strength steel sheet and manufacturing method therefor

The present invention relates to a high strength steel sheet having a tensile strength of 700 to 1,300 Mpa and an elongation of 12% or more, and having a tempered martensite single phase structure. The steel sheet of the present invention is manufactured through the steps of: rapidly heating a material steel sheet for 3 to 60 seconds to an Ac3 transformation point or higher and maintaining the material steel sheet, the material steel sheet containing 0.08 to 0.30 wt % of C, 0.01 to 2.0 wt % of Si, 0.30 to 3.0 wt % of Mn, 0.05 wt % or less of P and 0.05 wt % or less of S and the remainder being Fe and other unavoidable impurities; rapidly cooling the heated steel sheet to 100° C./s or higher with water or oil; and rapidly tempering to 500° C. to A1 transformation point for 3 to 60 seconds including heating and maintaining time.

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

A high-strength hot-dip coated hot-rolled steel sheet excellent in terms of surface appearance quality and coating adhesiveness and a method for manufacturing. The method includes performing hot rolling followed by pickling on steel to form a pickled steel sheet, the steel having a chemical composition containing, by mass %, C: 0.02% or more and 0.30% or less, Si: 0.01% or more and 1.0% or less, Mn: 0.3% or more and 2.5% or less, P: 0.08% or less, S: 0.02% or less, Al: 0.001% or more and 0.20% or less, and Fe and inevitable impurities. The method further includes performing rolling with a rolling reduction ratio of 1% or more and 10% or less, and a hot-dip coating treatment. The obtained steel sheet has an arithmetic average roughness Ra of 2.0 μm or less on the surface of the steel sheet, and a tensile strength of 590 MPa or more.

Flat Steel Product Having a Zn-Galvannealed Protective Coating, and Method for the Production Thereof

A flat steel product having a steel substrate and a protective coating having zinc as its main constituent that has been applied to the steel substrate by hot dip coating and produced by a subsequent galvannealing treatment, wherein the protective coating has pores on its free surface that extend into the protective coating. In the flat steel product, the proportions of right-skewed measurement traces determined in a topographic study are predominant over the proportion of non-right-skewed measurement traces both in the measurement direction and transverse to the measurement direction. Right-skewed measurement traces are determined by comparing the mean ascertained for each measurement trace with the median ascertained therefor. Those measurement traces where the mean is greater than the median are classified as being right-skewed.

Hot-pressed steel sheet member and method for producing same

Disclosed is a hot-pressed steel sheet member having a tensile strength of 1780 MPa or more and excellent bending collapsibility. The hot-pressed steel sheet member has: a specific chemical composition where a ratio of a C content in mass % to a Nb content in mass %, C/Nb, is from 22 to 100; a microstructure in which an average grain size of prior austenite grains is 8 μm or less, a volume fraction of martensite is 90% or more, and a solute C content is 25% or less of a total C content; and a tensile strength of 1780 MPa or more.

High-strength steel sheet with excellent crashworthiness characteristics and formability and method of manufacturing the same

Provided is a high-strength steel sheet including, in % weight, carbon (C): 0.04 to 0.15%, silicon (Si): 0.01 to 1.0%, manganese (Mn): 1.8 to 2.5%, molybdenum (Mo): 0.15% or less (excluding 0%), chromium (Cr): 1.0% or less (excluding 0%), phosphorus (P): 0.1% or less, sulfur (S): 0.01% or less, aluminum (Al): 0.01 to 0.5%, nitrogen (N): 0.01% or less, boron (B): 0.01% or less (excluding 0%), antimony (Sb): 0.05% or less (excluding 0%), one or more of titanium (Ti): 0.003 to 0.06% and niobium (Nb): 0.003 to 0.06%, a balance of Fe and other unavoidable impurities, and contents of the C, the Si, the Al, the Mo and the Cr satisfy the following Expression 1: Expression 1: {(2×(Si+Al))+Mo+Cr}/C≥15. The high-strength steel sheet comprises: a ferrite phase, a bainite phase, a martensite phase, and a residual austenite phase, the ferrite phase being less than 40% of area fraction in the microstructure.

High-strength steel sheet having excellent processability and method for manufacturing same

Provided is a high-strength steel sheet having a tensile strength of 780 MPa or higher. The high-strength steel sheet has a low yield ratio and excellent ductility (El) and strain hardening exponent (n) and thus has enhanced processability.

Hot press formed article having excellent delamination resistance and method for manufacturing the same

An HPF molding member having a melted aluminum plating layer formed on the surface of a base steel sheet and excellent delamination resistance. The base steel sheet comprises: 0.18-0.25% by weight of C; 0.1-1.0% by weight of Si; 0.9-1.5% by weight of Mn; 0.03% by weight or less of P; 0.01% by weight or less of S; 0.01-0.05% by weight of Al; 0.05-0.5% by weight of Cr; 0.01-0.05% by weight of Ti; 0.001-0.005% by weight of B; 0.009% by weight or less of N; and the balance Fe and other impurities. The plating layer consists of a soft diffusion layer and a hard alloy layer, the hard alloy layer having a tau layer irregularly and non-continuously dispersed and distributed on the inside thereof at 10% or more of the entire area fraction. The difference in hardness between the alloy layer and the diffusion layer is 400 (Hv) or less.

Oriented electrical steel sheet with excellent magnetic properties and method for manufacturing same

The present invention relates to a method of manufacturing a directional electric steel plate having excellent surface wettability and magnetic properties. More particularly, the present invention relates to a directional electric steel plate in which a surface of a steel plate consisting of Si: 2.0 to 6.5%, acid soluble Al: 0.4 to 5%, Mn: 0.20% or less (0% exclusive), N: 0.010% or less (0% exclusive), S: 0.010% or less (0% exclusive), P: 0.005 to 0.05%, C: 0.04 to 0.12% and a balance of Fe and other unavoidable impurities is hot-dip plated with aluminum or an aluminum-silicon alloy, and heat-treated, so that aluminum on the hot-dip plated layer is diffused or infiltrated into the steel plate, and a method of manufacturing the same.

Hot stamped component, precoated steel sheet used for hot stamping and hot stamping process

The present invention relates to a hot stamped component, a precoated steel sheet used for hot stamping, and a hot stamping process. The hot stamped component of the present invention is provided with a coating of aluminium or an aluminium alloy on at least one surface of the base steel, the coating is produced by interdiffusion between the base steel and a precoating of aluminium or aluminium alloy, and the coating has a thickness of 6 to 26 μm.

Coated steel product

There is provided a coated steel product having a steel product and a coating layer including a Zn—Al—Mg alloy layer disposed on a surface of the steel product, in which the Zn—Al—Mg alloy layer has a Zn phase, the Zn phase contains a Mg—Sn intermetallic compound phase, and the coating layer consists of Zn: more than 65.0%, Al: from more than 5.0% to less than 25.0%, Mg: from more than 3.0% to less than 12.5%, Sn: 0.1% to 20.0% in terms of percent (%) by mass, given amounts of optional elements, and impurities, and has a chemical composition that satisfies the following Formulas 1 to 5: Bi+In<Sn  Formula 1: Y+La+Ce≤Ca  Formula 2: Si<Sn  Formula 3: 0≤Cr+Ti+Ni+Co+V+Nb+Cu+Mn<0.25  Formula 4: 0≤Sr+Sb+Pb+B<0.5.  Formula 5:

成形性优良的高强度热镀锌钢板及其制造方法

本发明提供具有780MPa以上的TS、并且扩孔性和弯曲性优良的高强度热镀锌钢板及其制造方法。成分组成以质量％计含有C：0.05～0.15％、Si：0.8～2.5％、Mn：1.5～3.0％、P：0.001～0.05％、S：0.0001～0.01％、Al：0.001～0.1％、N：0.0005～0.01％、Cr：0.1～1.0％、Ti：0.0005～0.1％、B：0.0003～0.003％，余量由铁及不可避免的杂质构成，组织以面积率计具有30％以上的铁素体相和30％以上且70％以下的马氏体相，并且，在所述马氏体相中，回火马氏体相相对于全部马氏体相的比例为20％以上，另外，粒径为1μm以下的马氏体相相对于全部马氏体相的比例为10％以下。

屈服强度低、材质变化小的高强度热镀锌钢板及其制造方法

一种低YP且材质变化小的高强度热镀锌钢板，其特征在于，以质量％计，含有C：0.01～0.12％、Si：0.2％以下、Mn：小于2％、P：0.04％以下、S：0.02％以下、sol.Al：0.3％以下、N：0.01％以下、Cr：大于0.3％且在2％以下，而且满足2.19＜([％Mn]+1.3×[％Cr])＜3及0.24≤[％Cr]/[％Mn]，余量由铁及不可避免的杂质构成，并且具有铁素体和面积率为2～25％的第2相，第2相中的珠光体或贝氏体的面积率小于20％，第2相的平均粒径为0.9～7μm，第2相的粒径小于0.8μm的粒子的面积率小于15％。[％Mn]、[％Cr]分别表示Mn、Cr的含量。

高强度热压部件及其制造方法

本发明提供一种高强度热压部件及其制造方法。对以质量％计含有C：0.090％以上且小于0.30％、Mn：3.5％以上且小于11.0％的组成的冷轧钢板实施由在Ac1相变点～850℃的温度区域保持100s～48h的加热及其后的冷却构成的处理而制成坯料。然后，对坯料实施加热工序和热压成型工序而制成规定形状的热压部件，上述加热工序以800～1000℃的温度区域的温度保持600s以下，上述热压成型工序使用成型用模具同时实施加压成型和淬火。由此，能够得到具有含有3.0％以上的残余奥氏体相且剩余部分由马氏体相构成的组织的具有拉伸强度TS：1500MPa以上且均匀伸长率uEl：6.0％以上的拉伸特性的高强度热压部件。以表面具有Zn系镀覆层或Al系镀覆层的钢板作为所使用的冷轧钢板时，具有能够抑制部件表面形成氧化皮且提高热压部件的生产率的效果。

高强度镀锌钢板及其制造方法

本发明提供一种材质实现了需求高的高屈服比、并且镀覆外观、坯料的耐氢脆性优异、具有适合于建筑坯料、汽车的耐碰撞部件的高屈服比的高强度镀锌钢板及其制造方法。一种高强度镀锌钢板，具备：具有特定的成分组成和特定的钢组织且钢中的扩散性氢量为0.20质量ppm以下的钢板，以及该钢板的表面上的镀锌层，该镀锌层的Fe含量以质量％计为8～15％、每单侧面的镀覆附着量为20～120g/m 2 ，镀锌层中含有的Mn氧化物量为0.050g/m 2 以下，并且，上述高强度镀锌钢板的屈服强度为700MPa以上，屈服强度比为65％以上且小于85％。

Способ производства листовой стали, характеризующейся улучшенными прочностью, тягучестью и формуемостью

Изобретение относится к области металлургии. Для повышения предела текучести и предела прочности на растяжение способ производства листовой стали, обладающей микроструктурой, состоящей в долях площади из: от 20% до 50% межкритического феррита, от 10% до 20% остаточного аустенита, от 25% до 45% отпущенного мартенсита, от 10% до 20% свежего мартенсита и бейнита и от 30% до 60% суммарного количества отпущенного мартенсита и бейнита, включает получение холоднокатаной листовой стали, содержащей химический состав, мас.%: 0,18 ≤ С ≤ 0,25, 0,9 ≤ Si ≤ 1,8, 0,02 ≤ Al ≤ 1,0, при этом 1,00 ≤ Si + Al ≤ 2,35, 1,5 ≤ Mn ≤ 2,5, 0,010 ≤ Nb ≤ 0,035, 0,10 ≤ Cr ≤ 0,40, Fe и неизбежные примеси - остальное, отжиг листовой стали при температуре отжига Tв течение времени отжига tс обеспечением структуры, содержащей от 50% до 80% аустенита и от 20% до 50% феррита, закалку листа при скорости охлаждения от 20°С/с до 50°С/с до температуры закалки QT от Ms - 50°С до Ms - 5°С, нагрев листа до температуры распределения РТ от 375°С до 450°С и выдержку листа при температуре распределения РТ в течение времени распределения Pt, составляющего по меньшей мере 50 с, и охлаждение листа до комнатной температуры. 2 н. и 19 з.п. ф-лы, 8 табл. РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 716 920 C2 (51) МПК C21D 8/02 (2006.01) C21D 9/46 (2006.01) C21D 1/26 (2006.01) C23C 2/00 (2006.01) C22C 38/00 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (52) СПК C21D 8/02 (2020.01); C21D 9/46 (2020.01); C21D 1/26 (2020.01); C23C 2/00 (2020.01); C22C 38/00 (2020.01) (21)(22) Заявка: 2018122302, 21.12.2016 (24) Дата начала отсчета срока действия патента: (73) Патентообладатель(и): АРСЕЛОРМИТТАЛ (LU) Дата регистрации: 17.03.2020 21.12.2015 IB PCT/IB2015/059837 (43) Дата публикации заявки: 25.12.2019 Бюл. № 36 (56) Список документов, цитированных в отчете о поиске: RU 2557035 C1, 20.07.2015. EP 2546368 A1, 16.01.2013. RU 2403311 C2, 10.11.2010. WO 2011065591 A1, 03.06.2011. RU ...

热浸镀锌钢板

在母材钢板的以距表面为1/4厚度的位置为中心的1/8厚度～3/8厚度的范围中，铁素体相以体积分数计为50％～97％，由贝氏体相、贝氏体铁素体相、初生马氏体相和回火马氏体相中的1种以上构成的硬质组织的合计以体积分数计为3％以上，残余奥氏体相以体积分数计为0％～8％，珠光体相和粗大渗碳体相的合计以体积分数计为0％～8％；在热浸镀锌层和所述母材钢板的界面具有平均厚度为0.1μm～2.0μm、钢板宽度方向上的最大厚度和最小厚度之差在0.5μm以内的Fe‑Al合金层，在与所述Fe‑Al合金层直接接触的微细化层中，钢板宽度方向上的所述微细化层的最大厚度和最小厚度之差在2.0μm以内。

屈服强度500MPa级高延伸率热镀铝锌及彩涂钢板及其制造方法

一种屈服强度500MPa级高延伸率热镀铝锌和彩涂钢板及其制造方法，其化学重量百分比为：C：0.07％～0.15％，Si：0.02％～0.15％，Mn：1.3％～1.8％，S≤0.01％，N≤0.004％，Ti≤0.15％，Nb≤0.050％，其余为Fe和不可避免杂质；且需同时满足：(C+Mn/6)≥0.3％；不含Ti时，Nb满足0.01％≤(Nb‑0.22C‑1.1N)≤0.05％；不含Nb时，Ti满足0.5≤Ti/C≤1.5；Ti、Nb复合加入时，0.04％≤(Ti+Nb)≤0.2％。本发明获得的热镀铝锌及彩涂钢板的屈服强度≥500MPa，抗拉强度≥550MPa，延伸率≥15％，具有良好的强韧性和优良的耐腐蚀性能，且生产方法成本低、成材率高。此钢板可用于屋顶、墙面等钢结构建筑，以及家电等电器设备。

Способ изготовления высокопрочного стального изделия и стальное изделие, полученное таким образом

Изобретение относится к области металлургии. Для повышения механических характеристик стального изделия способ включает стадии: получения нагретого стального исходного изделия при температуре от 380 до 700°С, обладающего метастабильной аустенитной структурой и содержащего, в мас.%: 0,15 ≤ С ≤ 0,40, 1,5 ≤ Mn ≤ 4,0, 0,5 ≤ Si ≤ 2,5, 0,005 ≤ Al ≤ 1,5, при этом 0,8 ≤ Si + Al ≤ 2,5, S ≤ 0,05, P ≤ 0,1 по меньшей мере один элемент из: Cr и Мо: 0 ≤ Cr ≤ 4,0, 0 ≤ Mo ≤ 0,5 и 2,7 ≤ Mn + Cr + 3 Mo ≤ 5,7, и необязательно один или несколько элементов из: Nb ≤ 0,1, Ti ≤ 0,1, Ni ≤ 3,0, 0,0005 ≤ B ≤ 0,005, 0,0005 ≤ Ca ≤ 0,005, остальное- железо и неизбежные примеси, проведения стадии горячего формования при температуре от 700 до 380°С, с суммарной деформацией εот 0,1 до 0,7 по меньшей мере в одном местоположении нагретого стального исходного изделия для получения полностью аустенитной структуры горячеформованного стального изделия, после этого закаливания горячеформованного стального изделия путем охлаждения при скорости охлаждения VR, превосходящей критическую мартенситную скорость охлаждения, до температуры QT, меньшей Ms, для получения структуры, содержащей от 40 до 90% мартенсита, остальное аустенит, после этого сохранения продукции при температуре выдерживания РТ в диапазоне от QT до 470°С или повторного нагрева изделия до упомянутой температуры и выдерживания при температуре РТ в течение периода времени Pt от 5 сек до 600 сек. 2 н. и 23 з.п. ф-лы, 6 ил., 3 табл. РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 688 092 C2 (51) МПК C21D 7/13 (2006.01) C22C 38/58 (2006.01) C21D 8/02 (2006.01) C21D 8/00 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (52) СПК C21D 7/13 (2019.02); C22C 38/58 (2019.02); C21D 8/02 (2019.02); C21D 8/00 (2019.02) (21)(22) Заявка: 2017117067, 17.11.2015 (24) Дата начала отсчета срока действия патента: (73) Патентообладатель(и): АРСЕЛОРМИТТАЛ (LU) Дата регистрации: 17.05.2019 18.11.2014 IB PCT/IB2014/066128 (43) ...

镀覆粘附性优异的高锰热浸铝系镀覆钢板

本发明公开一种高锰热浸铝系镀覆钢板，其包括：基础钢板，所述基础钢板以重量％计，包括5～35％的Mn、0.3～6％的Al、0.1～1.2％的Si及余量的Fe和不可避免的杂质；及热浸铝系镀层，其形成在所述基础钢板的表面，并以重量％计，包括3～12％的Si及余量的Al和不可避免的杂质，在所述基础钢板与所述热浸铝系镀层的界面包括Fe‑Al‑Si‑Mn系合金相，并包括具有0.1～10μm厚度的合金层，以重量％计，所述合金层包括40～70％的Al、2～13％的Si、3～9％的Mn及余量的Fe和不可避免的杂质。

热浸镀锌钢板

在母材钢板的以距表面为1/4厚度的位置为中心的1/8厚度～3/8厚度的范围中，铁素体相以体积分数计为50％～97％，由贝氏体相、贝氏体铁素体相、初生马氏体相和回火马氏体相中的1种以上构成的硬质组织的合计以体积分数计为3％以上，残余奥氏体相以体积分数计为0％～8％，珠光体相和粗大渗碳体相的合计以体积分数计为0％～8％；在热浸镀锌层和所述母材钢板的界面具有平均厚度为0.1μm～2.0μm、钢板宽度方向上的最大厚度和最小厚度之差在0.5μm以内的Fe‑Al合金层，在与所述Fe‑Al合金层直接接触的微细化层中，钢板宽度方向上的所述微细化层的最大厚度和最小厚度之差在2.0μm以内。

成形性优良的高强度热镀锌钢板及其制造方法

本发明提供具有780MPa以上的TS，并且，具有优良的延伸特性、扩孔性、弯曲性的成形性优良的高强度热镀锌钢板及其制造方法。一种成形性优良的高强度热镀锌钢板，其特征在于，具有如下成分组成，以质量％计，含有C：0.05～0.2％、Si：0.5～2.5％、Mn：1.5～3.0％、P：0.001～0.05％、S：0.0001～0.01％、Al：0.001～0.1％、N：0.0005～0.01％，余量由Fe和不可避免的杂质构成；并且具有如下显微组织，含有铁素体相和包含回火马氏体相的马氏体相，铁素体相在组织总体中所占的面积率为30％以上，马氏体相在组织总体中所占的面积率为30～50％，回火马氏体相在马氏体相总体中所占的面积率为70％以上。

Горячештампованная сталь

РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2016 141 558 A (51) МПК C21D 1/18 (2006.01) B21D 22/20 (2006.01) C23C 2/06 (2006.01) C23C 2/28 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ЗАЯВКА НА ИЗОБРЕТЕНИЕ (21)(22) Заявка: 2016141558, 31.03.2015 (71) Заявитель(и): НИППОН СТИЛ ЭНД СУМИТОМО МЕТАЛ КОРПОРЕЙШН (JP) Приоритет(ы): (30) Конвенционный приоритет: 31.03.2014 JP 2014-073814 (85) Дата начала рассмотрения заявки PCT на национальной фазе: 31.10.2016 R U (43) Дата публикации заявки: 03.05.2018 Бюл. № 13 (72) Автор(ы): СЕНГОКУ Акихиро (JP), ТАКЕБАЯСИ Хироси (JP) (86) Заявка PCT: (87) Публикация заявки PCT: WO 2015/152284 (08.10.2015) A Адрес для переписки: 129090, Москва, ул. Большая Спасская, д. 25, строение 3, ООО "Юридическая фирма Городисский и Партнеры" R U (57) Формула изобретения 1. Горячештампованная сталь включает в себя: основной металл, который является сталью, имеющей отпущенный участок с твердостью, соответствующей 85% или менее от наивысшей закалочной твердости, причем наивысшая закалочная твердость определяется как твердость по Виккерсу в позиции на глубине, отстоящей от поверхности на 1/4 толщины листа, в случае осуществления закалки в воде после нагревания до температуры равной или выше чем точка Ac3 и выдерживания в течение 30 минут; и слой Zn покрытия, сформированный на упомянутом отпущенном участке основного металла, при этом слой Zn покрытия включает в себя: слой твердого раствора, включающий в себя фазу твердого раствора, которая содержит Fe и Zn, который растворен в твердом состоянии в Fe, и пластинчатый слой, который включает в себя фазу твердого раствора и прописная гамма фазу, и доля площади пластинчатого слоя в слое Zn покрытия составляет 20% или менее. 2. Горячештампованная сталь по п.1, в которой твердость отпущенного участка составляет 60% или менее наивысшей закалочной твердости, и доля площади пластинчатого слоя составляет от 5% до 20%. Стр.: 1 A 2 0 1 6 1 4 1 5 5 8 (54) ГОРЯЧЕШТАМПОВАННАЯ СТАЛЬ 2 0 1 6 1 4 1 5 5 8 ...

자기적 성질이 우수한 방향성 전기강판 및 그 제조방법

본 발명은 표면 젖음성 및 자기적 성질이 우수한 방향성 전기강판의 제조방법에 관한 것으로, 보다 상세하게는 Si: 2.0 내지 6.5 %, 산가용성 Al: 0.04 % 이하(0% 제외), Mn: 0.20 % 이하(0% 제외), N: 0.010 % 이하(0% 제외), S: 0.010 % 이하(0% 제외), P: 0.005 내지 0.05 %, C: 0.04 내지 0.12 %, 그리고 잔부의 Fe 및 기타 불가피한 불순물로 이루어진 강판의 표면에 알루미늄 또는 알루미늄-규소 합금이 용융도금되고 열처리되어 상기 용융도금 층의 알루미늄이 상기 강판에 확산 또는 침투된 방향성 전기강판 및 이의 제조방법에 관한 것이다.

가공성이 우수한 고항복비 고강도 용융 아연도금 강판과 그 제조 방법

본 발명의 가공성이 우수한 고강도 용융 아연도금 강판은 C, Si, Mn 등을 함유하고, 금속 조직이 페라이트와 마르텐사이트를 함유하는 복합 조직임과 동시에, 페라이트 조직에 있어서, 결정 방위차가 10° 이상인 입계의 단위 면적당 길이를 L a , 결정 방위차가 10° 미만인 입계의 단위 면적당 길이를 L b 로 했을 때, 0.2≤(L b /L a )≤1.5를 만족하고, 결정 방위차가 10° 이상인 입계로 둘러싸인 페라이트립의 원 상당 직경을 D로 했을 때, D의 평균치가 25㎛ 이하임과 동시에, 결정 방위차가 10° 이상인 입계로 둘러싸인 페라이트립 중 D≤30㎛를 만족하는 결정립이 면적률로 50% 이상이고, 인장강도가 980MPa 이상이다.

Steel plate

本发明涉及一种钢板，其具有规定的化学组成；所述钢板以面积％计，具有用板条中的当量圆直径为2nm～500nm的铁碳化物的数量在2个以上的第1马氏体：20％～95％、铁素体：15％以下、残余奥氏体：15％以下、以及剩余部分：贝氏体或者板条中的当量圆直径为2nm～500nm的铁碳化物的数量低于2个的第2马氏体或者它们两者所表示的钢组织；ND//＜111＞方位晶粒以及ND//＜100＞方位晶粒的总面积分数为40％以下，固溶C的量为0.44ppm以上。

High-strength hot-dip galvanized steel sheet having excellent impact peeling resistance and corrosion resistance of worked portion

一种高强度热浸镀锌钢板，其特征在于，在拉伸强度为590MPa以上的钢板母材上具有热浸镀锌层，所述镀层具有接触钢板母材的凸状合金层，凸状合金层的个数密度相对于从截面方向观察的钢板母材与镀层的界面的单位长度为4个/mm以上，该界面的凸状合金层的最大直径为100μm以下，所述钢板母材具有：直接接触钢板母材与镀层的界面的微细化层、与所述微细化层接触且存在于钢板母材的内向侧的脱碳层、和除所述微细化层及脱碳层以外的内部层，在所述微细化层、脱碳层、及凸状合金层的层内含有Si及Mn中的1种或2种以上的氧化物。

용융 아연 도금 강판

프레스 가공 후에 있어서의 도금 밀착성, 스폿 용접성, 프레스 가공 후의 도장 후 내식성이 우수하고, 또한 우수한 도장 후 외관을 갖는 용융 아연 도금 강판을 제공하는 것을 목적으로 한다. 강판과 용융 아연 도금층과 금속간 화합물을 갖고, 강판에 대해서는, 질량％ 로, C：0.03 ％ 이상 0.70 ％ 이하, Si：0.10 ％ 이하, Mn：0.5 ％ 이상 0.9 ％ 이하, P：0.020 ％ 이상 0.050 ％ 이하, S：0.010 ％ 이하, Nb：0.010 ％ 이상 0.035 ％ 이하, N：0.005 ％ 이하, Al：0.10 ％ 이하를 함유하고, 잔부가 Fe 및 불가피적 불순물로 이루어지고, 용융 아연 도금층에 대해서는 Al 을 0.3 ％ 이상 0.6 ％ 이하 함유하고, 금속간 화합물에 대해서는 0.12 gm -2 이상 0.22 gm -2 이하의 Al 을 함유하고, 또한 평균 입경 1 ㎛ 이하의 Fe 2 Al 5 를 함유한다.

Горячештампованная сталь

РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2016 140 280 A (51) МПК C23C 2/06 (2006.01) C21D 8/00 (2006.01) C21D 1/18 (2006.01) B21D 22/20 (2006.01) C22C 38/00 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ЗАЯВКА НА ИЗОБРЕТЕНИЕ (21)(22) Заявка: 2016140280, 31.03.2015 (71) Заявитель(и): НИППОН СТИЛ ЭНД СУМИТОМО МЕТАЛ КОРПОРЕЙШН (JP) Приоритет(ы): (30) Конвенционный приоритет: 31.03.2014 JP 2014-073811 (85) Дата начала рассмотрения заявки PCT на национальной фазе: 31.10.2016 R U (43) Дата публикации заявки: 07.05.2018 Бюл. № 13 (72) Автор(ы): СЕНГОКУ Акихиро (JP), ТАКЕБАЯСИ Хироси (JP) (86) Заявка PCT: (87) Публикация заявки PCT: WO 2015/152263 (08.10.2015) A Адрес для переписки: 129090, Москва, ул. Большая Спасская, д. 25, строение 3, ООО "Юридическая фирма Городисский и Партнеры" R U (57) Формула изобретения 1. Горячештампованная сталь, содержащая: основной металл, который представляет собой сталь, включающую в себя отпущенную часть, имеющую твердость, соответствующую 85% или меньше от максимальной закалочной твердости, определяемой как твердость по Виккерсу в положении глубины, отстоящем от поверхностного слоя на 1/4 толщины листа, в случае выполнения закалки в воде после нагревания до температуры, равной или выше, чем температура точки Ac3, и выдержки в течение 30 мин; и слой цинкового покрытия, который формируется на отпущенной части основного металла, причем слой цинкового покрытия включает в себя: слой твердого раствора, включающий фазу твердого раствора, которая содержит Fe и твердорастворенный в нем Zn, и ламельный слой, который включает фазу твердого раствора и Г-фазу, и причем в слое цинкового покрытия доля площади ламельного слоя составляет от 30 до 100%, а доля площади слоя твердого раствора составляет от 0 до 70%. 2. Горячештампованная сталь по п. 1, в которой доля площади ламельного слоя в слое цинкового покрытия составляет 80% или более. 3. Горячештампованная сталь по п. 1 или 2, в которой твердость по Виккерсу Стр.: 1 A 2 0 1 6 1 4 0 ...

The manufacturing method and manufacturing equipment of high strength hot dip galvanized steel sheet

提供一种镀敷密合性、加工性和外观性优异的高强度熔融镀锌钢板的制造方法。一种高强度熔融镀锌钢板的制造方法，其具有下述工序：热轧工序，对以质量％计包含C：0.05～0.30％、Si：0.1～2.0％、Mn：1.0～4.0％的钢坯进行热轧后，以特定的温度T C 卷取成卷材，并进行酸洗；冷轧工序，对热轧工序中得到的热轧板实施冷轧；退火工序，对冷轧工序中得到的冷轧板以特定的条件实施退火；和熔融镀锌处理工序，对于退火工序后的退火板，在含有0.12～0.22质量％的Al的熔融镀锌浴中实施熔融镀锌处理。

High-strength hot-dip galvanized steel sheet having excellent delayed fracture resistance, and method for producing same

本发明涉及在母材钢板的表面形成有热浸镀锌层或者合金化热浸镀锌层的高强度热浸镀锌钢板，所述母材钢板以体积分数计具有40～90%的铁素体相和5%以下的残余奥氏体相，而且未再结晶铁素体在整个所述铁素体相中所占的比例以体积分数计为50%以下；进而铁素体相的晶粒在轧制方向的平均粒径除以板宽度方向的平均粒径所得到的值即粒径比为0.75～1.33，分散成岛状的硬质组织在轧制方向的平均长度除以板宽度方向的平均长度所得到的值即长度比为0.75～1.33，而且夹杂物的平均纵横尺寸比为5.0以下。

Alloyed hot-dip galvanized steel sheet and method for producing the same

Steel sheet pated with al-fe for hot press forming having excellent wear resistance of mold and manufacturing method thereof

금형 내마모성이 우수한 열간 프레스용 알루미늄-철계 도금강판 및 그 제조방법을 제공하고자 하는 것이다. An object of the present invention is to provide an aluminum-iron-based plated steel sheet for hot pressing with excellent mold abrasion resistance and a method for manufacturing the same.

Tempered and coated steel sheet with excellent formability and manufacturing method thereof

본 발명은, 중량% 로 표시되는 하기의 원소들: 0.17 % ≤ 탄소 ≤ 0.25 %, 1.8 % ≤ 망간 ≤ 2.3 %, 0.5 % ≤ 규소 ≤ 2.0 %, 0.03 % ≤ 알루미늄 ≤ 1.2 %, 황 ≤ 0.03 %, 인 ≤ 0.03 %, 을 포함하고, 하기의 선택적 원소들: 크롬 ≤ 0.4 %, 몰리브덴 ≤ 0.3 %, 니오븀 ≤ 0.04 %, 티타늄 ≤ 0.1 %, 중의 하나 이상을 함유할 수 있는 조성을 갖고, 잔부 조성은 철 및 공정에 기인하는 불가피적 불순물로 이루어지고, 강 시트의 미세조직은 면적 분율로 3 내지 20 % 의 잔류 오스테나이트, 적어도 15 % 의 페라이트, 40 내지 85 % 의 템퍼링된 베이나이트 및 최소 5 % 의 템퍼링된 마텐자이트를 포함하고, 템퍼링된 마텐자이트 및 잔류 오스테나이트의 누적된 양은 10 내지 30 % 인, 템퍼링되고 코팅된 강 시트, 및 이의 제조 방법에 관한 것이다.

High-strength hot-dip galvanized steel sheet and method for manufacturing same

고가의 합금 원소를 적극적으로 함유하지 않는 성분계에서, 우수한 연신율, 신장 플랜지성을 갖는 가공성이 우수한 인장 강도 900 ㎫ 이상의 고강도 용융 아연 도금 강판을 얻는다. 질량％ 로, C : 0.16 ∼ 0.24 ％, Si : 0.8 ∼ 1.8 ％, Mn : 1.0 ∼ 3.0 ％, P : 0.020 ％ 이하, S : 0.0040 ％ 이하, Al : 0.01 ∼ 0.1 ％, N : 0.01 ％ 이하, Ca : 0.0001 ∼ 0.0020 ％ 를 함유하고, 잔부가 Fe 및 불가피 불순물로 이루어지는 성분 조성을 갖고, 페라이트상과 베이나이트상의 합계의 조직 전체에 대한 면적 비율이 30 ∼ 70 ％, 템퍼드 마텐자이트상의 조직 전체에 대한 면적 비율이 20 ∼ 40 ％, 잔류 오스테나이트상의 조직 전체에 대한 면적 비율이 10 ∼ 20 ％, 마텐자이트상의 조직 전체에 대한 면적 비율이 2 ∼ 20 ％ 인 것을 특징으로 하는 고강도 용융 아연 도금 강판.

Method and apparatus for producing high-strength hot-dipped galvanized steel sheet

도금 밀착성, 가공성 및 외관이 우수한 고강도 용융 아연 도금 강판의 제조 방법을 제공한다. 질량％로, C: 0.05∼0.30％, Si: 0.1∼2.0％, Mn: 1.0∼4.0％ 포함하는 슬래브를 열간 압연한 후, 특정의 온도 T C 에서 코일로 권취하고, 산 세정하는 열간 압연 공정과, 열간 압연 공정으로 얻어진 열연판에 대하여 냉간 압연을 실시하는 냉간 압연 공정과, 냉간 압연 공정으로 얻어진 냉연판에 대하여, 특정의 조건으로 어닐링을 실시하는 어닐링 공정과, 어닐링 공정 후의 어닐링판에 대하여, 0.12∼0.22질량％의 Al을 함유한 용융 아연 도금욕에서 용융 아연 도금 처리를 실시하는 용융 아연 도금 처리 공정을 갖는 고강도 용융 아연 도금 강판의 제조 방법으로 한다.

Method for improvement of metal coating on steel band

Изобретение относится к нанесению металлического покрытия на стальную ленту (1). Для повышения коррозионной стойкости покрытия проводят оплавление покрытия посредством индукционного нагрева с помощью по меньшей мере одной катушки (2) индуктивности при максимальной температуре (ПТМ), превышающей температуру плавления (T s ) материала покрытия, затем в охлаждающем устройстве (3) охлаждают до температуры (Т А ) быстрого охлаждения, лежащей ниже температуры плавления, при этом покрытие в течение времени (t h ) выдерживают при температуре, превышающей температуру плавления (T S ), и что время выдержки (t h ) посредством перемещения по меньшей мере одной катушки (2) индуктивности относительно охлаждающего устройства (3) согласуют с максимальной температурой (ПТМ) и толщиной покрытия, чтобы полностью расплавить покрытие на всю его толщину вплоть до слоя, граничащего со стальной лентой. 2 н. и 10 з.п. ф-лы, 3 ил. РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (51) МПК C21D 9/60 C23C 2/26 H05B 6/40 C21D 1/42 (13) 2 590 787 C2 (2006.01) (2006.01) (2006.01) (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ (21)(22) Заявка: ИЗОБРЕТЕНИЯ К ПАТЕНТУ 2014132568/02, 22.01.2013 (24) Дата начала отсчета срока действия патента: 22.01.2013 Приоритет(ы): (30) Конвенционный приоритет: (43) Дата публикации заявки: 20.03.2016 Бюл. № 8 (73) Патентообладатель(и): ТиссенКрупп Рассельштайн ГмбХ (DE) R U 23.01.2012 DE 102012100509.5 (72) Автор(ы): МАТУШ, Дирк (DE), ЗАУЭР, Райнер (DE), ОБЕРХОФФЕР, Хельмут (DE), ТОМАС, Райнер (DE), ОППЕР, Маркус (DE) (45) Опубликовано: 10.07.2016 Бюл. № 19 (85) Дата начала рассмотрения заявки PCT на национальной фазе: 25.08.2014 (86) Заявка PCT: 2 5 9 0 7 8 7 (56) Список документов, цитированных в отчете о поиске: DE 1186158 A, 28.01.1965. RU 2300579 C2, 10.06.2007. RU 2417265 C2, 27.04.2011. BY 12054 C1, 30.06.2009. RU 2323266 C2, 27.04.2008. 2 5 9 0 7 8 7 R U (87) Публикация заявки PCT: C 2 C 2 EP 2013/051077 (22.01.2013) WO 2013/110577 (01.08.2013) ...

METHOD FOR PRODUCING SHEET STEEL CHARACTERIZED BY IMPROVED STRENGTH, MOLIGENCY AND FORMABILITY

РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2018 122 302 A (51) МПК C21D 6/00 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ЗАЯВКА НА ИЗОБРЕТЕНИЕ (21)(22) Заявка: 2018122302, 21.12.2016 (71) Заявитель(и): АРСЕЛОРМИТТАЛ (LU) Приоритет(ы): (30) Конвенционный приоритет: 21.12.2015 IB PCT/IB2015/059837 (85) Дата начала рассмотрения заявки PCT на национальной фазе: 19.06.2018 R U (43) Дата публикации заявки: 25.12.2019 Бюл. № 36 (72) Автор(ы): ЦЗУНЬ, Хюнь Цзо (US), ВЕНКАТАСУРИЯ, Паван (US) (86) Заявка PCT: (87) Публикация заявки PCT: WO 2017/108956 (29.06.2017) R U (54) СПОСОБ ПРОИЗВОДСТВА ЛИСТОВОЙ СТАЛИ, ХАРАКТЕРИЗУЮЩЕЙСЯ УЛУЧШЕННЫМИ ПРОЧНОСТЬЮ, ТЯГУЧЕСТЬЮ И ФОРМИРУЕМОСТЬЮ (57) Формула изобретения 1. Способ производства листовой стали, обладающей микроструктурой, состоящей в долях площади из от 20% до 50% межкритического феррита, от 10% до 20% остаточного аустенита, от 25% до 45% отпущенного мартенсита, от 10% до 20% свежего мартенсита и бейнита, при этом суммарное количество долей площади отпущенного мартенсита и бейнита находится в пределах от 30% до 60%, при этом способ включает следующие последовательные стадии: получение холоднокатаной листовой стали, химический состав которой включает в % (масс.): 0,18% ≤ С ≤ 0,25%, 0,9% ≤ Si ≤ 1,8%, 0,02% ≤ Al ≤ 1,0%, причем 1,0% ≤ Si + Al ≤ 2,35%, 1,5% ≤ Mn ≤ 2,5%, 0,010% ≤ Nb ≤ 0,035%, 0,10% ≤ Cr ≤ 0,40%, при этом остаток представляет собой Fe и неизбежные примеси, отжиг листовой стали при температуре отжига TA и в течение времени отжига tA таким образом, чтобы получить структуру, содержащую от 50% до 80% аустенита и Стр.: 1 A 2 0 1 8 1 2 2 3 0 2 A Адрес для переписки: 109012, Москва, ул. Ильинка, 5/2, ООО "Союзпатент" 2 0 1 8 1 2 2 3 0 2 EP 2016/082192 (21.12.2016) A 2 0 1 8 1 2 2 3 0 2 A R U 2 0 1 8 1 2 2 3 0 2 Стр.: 2 R U от 20% до 50% феррита, закалку листовой стали при скорости охлаждения, находящейся в пределах от 20°С/ сек до 50°С/сек, вплоть до температуры закалки QT, находящейся в пределах от Ms – 50° ...

Steel for tool-less hot forming or quenching with improved ductility

본 발명은 강 부품에 관한 것으로서, 강의 조성은 중량 % 로, 0.040 % ≤ C ≤0.100 %, 0.80 % ≤ Mn ≤2.00 %, Si ≤ 0.30 %, S ≤ 0.005 %, P ≤ 0.030 %, 0.010 % ≤ Al ≤0.070 %, 0.015 % ≤ Nb ≤0.100 %, 0.030 % ≤ Ti ≤0.080 %, N ≤ 0.009 %, Cu ≤ 0.100 %, Ni ≤ 0.100 %, Cr ≤ 0.100 %, Mo ≤ 0.100 %, Ca ≤ 0.006 % 를 함유하고, 잔부는 철 및 제련으로 인한 불가피한 불순물로 이루어지며, 상기 강의 미세 조직은 적어도 75 % 의 등축 페라이트, 5 % 이상 ~ 20 % 이하의 마르텐사이트 및 10 % 이하의 베이나이트로 이루어진다.

Material for high strength steel sheets, hot rolled material for high strength steel sheets, hot-rolled and annealed material for high strength steel sheets, high strength steel sheet, high strength hot-dip-coated steel sheet, high strength electroplated steel sheet, and method of manufacturing same

인장 강도로 980MPa 이상 또한 TS-El 밸런스로 30000MPa% 이상을 가지고, 또한 주조시의 슬라브 표면 품질 및 편석 등의 내부 품질을 향상시키는 것에 의해, 표면 품질과 성형성이 뛰어난 고강도 강판을 제공한다. C: 0.08∼0.30%, Si: 2.0% 이하, Mn: 3.0% 초과 10.0% 이하, P: 0.05% 이하, S: 0.01% 이하, Al: 1.5% 이하, Ti: 0.010∼0.300% 및 N: 0.0020∼0.0100% 이하를, 1.1≤(Ti+Mn 1 /2 /400)/(0.01+5N)≤6.0을 만족하는 범위에서 포함하는 성분 조성과, 잔류 오스테나이트상 및 페라이트상을 포함하는 조직을 가지고, 상기 페라이트상의 평균 Mn 농도(αMn)에 대한 잔류 오스테나이트상의 평균 Mn 농도(γMn)의 비 γMn/αMn을 1.5 이상으로 한다.

Method for producing a high strength coated steel sheet having improved strength, formability and obtained sheet

본 발명은 개선된 연성 및 개선된 성형성을 갖는 고강도의 코팅된 강 시트의 제조 방법에 관한 것으로, 강의 화학 조성은 0.13 % ≤ C ≤ 0.22 %, 1.9 % ≤ Si ≤ 2.3 %, 2.4 % ≤ Mn ≤ 3 %, Al ≤ 0.5 %, Ti ＜ 0.05 %, Nb ＜ 0.05 % 를 포함하고, 잔부는 Fe 및 불가피적 불순물이다. 상기 시트는, Ac3 보다 높고 1000 ℃ 미만의 온도 (TA) 에서 30 초 초과의 시간동안 어닐링되고; 오스테나이트 및 적어도 50 % 의 마르텐사이트로 구성되는 조직을 얻기 위해 200 ℃ 내지 280 ℃ 의 켄칭 온도 (QT) 까지 냉각됨으로써 켄칭되고, 오스테나이트 함량은 최종 조직이 페라이트 없이 3 % 내지 15 % 의 잔류 오스테나이트 및 85 % 내지 97 % 의 마르텐사이트와 베이나이트의 합계를 가질 수 있도록 하는 함량이고; 430 ℃ 내지 490 ℃ 의 파티셔닝 온도 (PT) 까지 가열되고 10 s 내지 100 s 의 시간 (Pt) 동안 상기 파티셔닝 온도에서 유지되고; 용융 코팅되고; 실온까지 냉각된다.

Hot-dip Al-Zn-Mg-Si-Sr plated steel sheet and its manufacturing method

양호한 표면 외관성을 가짐과 함께, 가공부의 내식성이 우수한 용융 Al-Zn-Mg-Si-Sr 도금 강판을 제공하는 것을 목적으로 한다. 상기 목적을 달성하기 위해서, 본 발명은, 도금층이, Al : 25 ∼ 70 질량％, Si : 0.6 ∼ 5 질량％, Mg : 0.1 ∼ 10 질량％ 및 Sr : 0.001 ∼ 1.0 질량％ 를 함유하고, 잔부가 Zn 및 불가피적 불순물로 이루어지는 조성을 갖고, 잔부가 Zn 및 불가피적 불순물로 이루어지는 조성을 갖고, 상기 도금층은, 하지 강판과의 계면에 존재하는 계면 합금층과 그 합금층 상에 존재하는 주층으로 이루어지고, 상기 주층과 상기 계면 합금층의 사이에, 평균 장경이 1 ㎛ 이하인 Al-Si-Sr 합금이 존재하는 것을 특징으로 한다.

Hot-dip galvanized steel and alloyed hot-dip galvanized steel

균일 연성 및 국부 연성과, 항복 강도 및 인장 강도와, 저온 충격 특성을 향상시킨 용융 아연 도금 강판 및 합금화 용융 아연 도금 강판이며, 소정의 성분 조성을 갖고, 금속 조직이, 체적％로, 잔류 오스테나이트: 5.0％ 초과 및 템퍼링 마르텐사이트: 5.0％ 초과를 포함하고, 잔류 오스테나이트가, C: 0.85질량％ 이상을 포함하며, 구 오스테나이트 입계에 있어서의 C 편석량(원자수/㎚ 2 ): [C] γgb 와, P 편석량(원자수/㎚ 2 ): [P] γgb 의 비: [C] γgb /[P] γgb 가 4.0 이상인 것을 특징으로 한다.

Zn-Al-Mg-Si alloy plated steel product having excellent corrosion resistance and method for preparing the same

耐腐蚀性优异的Zn－Al－Mg－Si合金镀覆钢材及其制造方法。一种耐腐蚀性优异的Zn－Al－Mg－Si合金镀覆钢材,其特征在于,其中按质量%计含有Al:45%以上至70%以下,Mg:3%以上至不足10%,Si:3%以上至不足10%,其余为Zn和不可避免的杂质,而且Al/Zn:满足0.89～2.75,并且,在镀层中含有块状的Mg 2 Si相。以及,一种耐腐蚀性优异的Zn－Al－Mg－Si合金镀覆钢材,其特征在于,其中按质量%计含有Al:45%以上至70%以下,Mg:1%以上至不足5%,Si:0.5%以上至不足3%,其余为Zn和不可避免的杂质,而且Al/Zn:满足0.89～2.75,并且,在镀层中含有鳞片状的Mg 2 Si相。

Steel plate

本发明的一方式涉及一种钢板，其化学成分处在规定的范围内；板厚1/4部分的金属组织以单位面积％计，含有铁素体：10％以上且低于50％、粒状贝氏体：5％以上且低于50％、以及马氏体：20％以上且低于60％；在板厚1/4部分的所述金属组织中，上贝氏体、下贝氏体、残余奥氏体以及珠光体的合计以单位面积％计为0％以上且低于15％；在所述板厚1/4部分，所述马氏体的面积率Vm和所述马氏体的平均硬度Hv之积为12000～34000；抗拉强度为980MPa以上。

Galvanized steel sheet and method for producing same

本发明一方式的镀锌钢板具备具有预定化学组成的钢板和镀锌层。所述钢板中，以从表面起算1/4厚为中心的1/8厚～3/8厚的范围的钢组织，以体积％计含有铁素体：0～10％、贝氏体：0～20％、回火马氏体：70％以上、新生马氏体：0～10％、残余奥氏体：0～10％、珠光体：0～5％。所述镀锌钢板在除去所述镀锌层后，将所述钢板从室温加热到200℃时释放的氢量相对于钢板单位质量为0.40ppm以下，抗拉强度1470MPa以上，施加24小时的相当于1000MPa的应力的U字弯曲试验中不产生裂纹。

HIGH-STRENGTH STEEL SHEET HAVING EXCELLENT HYDROGEN EMBRITTLEMENT RESISTANCE AND MAXIMUM TENSILE STRENGTH OF 900 MPa OR MORE, AND PROCESS FOR PRODUCTION THEREOF

강판의 조직 중에, (a) 체적분율로, 페라이트가 10 내지 50%, 베이니틱 페라이트 및/또는 베이나이트가 10 내지 60% 및 템퍼링한 마르텐사이트가 10 내지 50% 존재하고, 또한, (b) Si, 또는 Si와 Al을 0.1% 이상 함유하는 철계 탄화물이 4×10 8 (개/㎣) 이상 존재하는 것을 특징으로 하는 내수소취화 특성이 우수한 인장 최대 강도가 900 MPa 이상인 고강도 강판.

METHOD FOR IMPROVING METAL COATING ON STEEL TAPE

1. Способ улучшения металлического покрытия на стальной ленте (1) или стальном листе, в котором покрытие посредством индукционного нагрева с помощью по меньшей мере одной катушки (2) индуктивности оплавляют при максимальной температуре (ПТМ, пиковая температура металла), превышающей температуру плавления (T) материала покрытия, и затем в охлаждающем устройстве (3) охлаждают до температуры (Т) быстрого охлаждения, лежащей ниже температуры плавления, отличающийся тем, что покрытие в течение времени выдержки (t) выдерживают при температуре, превышающей температуру плавления (T), и что время выдержки (t) посредством смещения по меньшей мере одной катушки (2) индуктивности относительно охлаждающего устройства (3) согласуют с максимальной температурой (ПТМ) и толщиной покрытия, чтобы полностью расплавить покрытие на всю его толщину вплоть до слоя, граничащего со стальной лентой.2. Способ по п. 1, отличающийся тем, что максимальная температура превышает 310°C и что покрытие полностью расплавляют на всю его толщину вплоть до слоя, граничащего со стальной лентой.3. Способ по п. 1 или п. 2, отличающийся тем, что максимальная температура (ПТМ) лежит в диапазоне от 310 до 360°C и предпочтительно от 320 до 350°C.4. Способ по п. 1, отличающийся тем, что плоскость нагрева при индукционном нагреве лежит в диапазоне от 600 до 1300 К/с, предпочтительно до 1100 К/с.5. Способ по п. 1, отличающийся тем, что стальную ленту (1) с покрытием перемещают относительно катушки (2) индуктивности с определенной скоростью движения ленты (v).6. Способ по п. 1, отличающийся тем, что расстояние от катушки (2) индуктивности до охлаждающего устройства (3) можно плавно регулировать для установки желаемого значения времени выдержки (t).7. Способ по п. 1, отличающийся тем, РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (51) МПК C21D 9/60 C23C 2/26 H05B 6/40 C21D 1/42 (13) 2014 132 568 A (2006.01) (2006.01) (2006.01) (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ЗАЯВКА НА ИЗОБРЕТЕНИЕ (21)(22) ...

High strength galvanized steel sheet and manufacturing method thereof

전단 단면 균열을 개선할 수 있는 고강도 아연 도금 강판 및 그 제조 방법을 제공한다. 특정한 성분 조성과, 페라이트와 탄화물을 갖지 않는 베이나이트를 면적률의 합계로 0 ∼ 65 ％, 마텐자이트와 탄화물을 갖는 베이나이트를 면적률의 합계로 35 ∼ 100 ％, 잔류 오스테나이트를 면적률로 0 ∼ 15 ％ 를 포함하는 강 조직을 갖고, 강판 중의 확산성 수소량이 질량％ 로 0.00008 ％ 이하 (0 ％ 를 포함한다) 인 모재 강판과, 그 모재 강판 상에 형성된 아연 도금층을 구비하고, 상기 아연 도금층의, 압연 방향과 수직인 판두께 단면에 있어서의 상기 아연 도금층 전체 두께를 분단하는, 간극의 밀도가 10 개/㎜ 이상인 것을 특징으로 하는 고강도 아연 도금 강판으로 한다.

Hot-dip galvanized steel sheet and process for producing same

本发明提供一种热浸镀锌钢板，其具备钢板和所述钢板表面上的镀层，其中，显微组织以体积分率计合计含有20%以上且99%以下的马氏体及贝氏体中的1种或2种；剩余组织含有铁素体、体积分率低于8%的残留奥氏体及体积分率为10%以下的珠光体中的1种或2种；所述热浸镀锌钢板具有980MPa以上的抗拉强度；所述镀层是热浸镀锌层，所述热浸镀锌层含有包含Si、Mn或Al中的1种或2种以上的氧化物，并且含有15质量%以下的Fe，剩余部分含有Zn、Al及不可避免的杂质，当在包含所述钢板和所述热浸镀锌层的板厚方向截面观察时，投影面积率为10%以上且90%以下。