Nippon Steel & Sumikin Stainless Steel Corporation

Nippon Steel Corporation

Nippon Steel Stainless Steel Corporation

Naoto Ono

Junichi Hamada

Toshio Tanoue

Tadashi Komori

Akihiko Takahashi

Yoshiharu Inoue

Ken Kimura

Shunji Sakamoto

Yuji Koyama

Fumio Fudanoki

Masayuki Abe

Kenji Kato

Masao Kikuchi

Shuji Yamamoto

Michio Kaneko

Nobuhiko Hiraide

Haruhiko Kajimura

Katsuhiko Kato

Tooru Matsuhashi

Noriyo Morihiro

A heat-resistant cold rolled ferritic stainless steel sheet containing, in mass %, 0.02% or less of C, 0.1% to 1.0% of Si, greater than 0.6% to 1.5% of Mn, 0.01% to 0.05% of P, 0.0001% to 0.0100% of S, 13.0% to 20.0% of Cr, 0.1% to 3.0% of Mo, 0.005% to 0.20% of Ti, 0.3% to 1.0% of Nb, 0.0002% to 0.0050% of B, 0.005% to 0.50% of Al, 0.02% or less of N, with the balance being Fe and inevitable impurities, in which {111}-oriented grains are present at an area ratio of 20% or greater in a region from a surface layer to t/4 (t is a sheet thickness), {111}-oriented grains are present at an area ratio of 40% or greater in a region from t/4 to t/2, and {011}-oriented grains are present at an area ratio of 15% or less in the entire region in a thickness direction.

Hot rolled ferritic stainless steel sheet for cold rolling raw material

One aspect of this ferritic stainless steel sheet contains, by mass %, C: 0.03% or less, N: 0.05% or less, Si: 1% or less, Mn: 1.2% or less, Cr: 14% or more and 28% or less, Nb: 8(C +N) or more and 0.8% or less, and Al: 0.1% or less, with a balance being Fe and inevitable impurities, in which a film satisfying Expression 1 is formed in a surface thereof. Expression 1 is d&#xd7;Cr+5(Si+3Al)&#x2264;2.0. In Expression 1, drepresents a thickness (nm) of the film, Crrepresents a Cr cationic fraction in the film, Sirepresents a Si cationic fraction in the film, and Alrepresents an Al cationic fraction in the film.

Ferritic stainless steel sheet having excellent brazability, heat exchanger, ferritic stainless steel sheet for heat exchangers, ferritic stainless steel, ferritic stainless steel for members of fuel supply systems, and member of fuel supply system

The invention provides structural component for an automobile, two-wheeled vehicle or railcar excellent in impact-absorption property, shape fixability and flange cuttability, and method for producing the same, which structural component has a hat-like shape including vertical walls and flanges, wherein distal ends of the flanges contain 20 vol % or greater of austenite phase and have a cross-section hardness expressed as Vickers harness of 150&#x2dc;350, and a center regions of the vertical walls have, in a common cross-section with the flanges, a content of deformation-induced martensite phase exceeding that of the distal ends of the flanges by 10 vol % or greater and a cross-section hardness expressed as Vickers hardness that exceeds that of the distal ends of the flanges by 50 or greater.

Structural component for automobile, two-wheeled vehicle or railcar excellent in impact-absorption property, shape fixability and flange cuttability, and method for producing the same

The present invention provides a ferritic stainless steel sheet superior in shapeability containing, by wt %, C: 0.001 to 0.010%, Si: 0.01 to 1.0%, Mn: 0.01 to 1.0%, P: 0.01 to 0.04%, Cr: 10 to 20%, N: 0.001 to 0.020%, Nb: 0.3 to 1.0%, and Mo: 0.5 to 2.0%, wherein the total precipitates are, by wt %, 0.05 to 0.60%. A method of production of a ferritic stainless steel sheet superior in shapeability comprising producing a cold rolling material in the production process so that the Nb-based precipitates become, by vol %, 0.15% to 0.6% and have a diameter of 0.1 &#x3bc;m to 1 &#x3bc;m and/or so that the recrystallized grain size becomes 1 &#x3bc;m to 40 &#x3bc;m and the recrystallization rate becomes 10 to 90%, then cold rolling and annealing it at 1010 to 1080&#xb0; C.

Ferritic stainless steel sheet superior in shapeability and method of production of the same

A ferritic stainless steel welded pipe is ferritic stainless steel welded pipe contains, by wt %, C: 0.001 to 0.015%, N: 0.001 to 0.020%, Cr: 11 to 25%, Mo: 0.01 to 2.0%, one or both of Ti and Nb in 0.05 to 0.5%, and B: 0.0003 to 0.0030%, having an elongation of the welded pipe material in the direction becoming the circumferential direction of 30% or more, and having an average Lankford value of 1.5 or more, which is formed, welded, and sized by 0.5 to 2.0% in terms of circumferential length, then annealed at 700 to 850&#xb0; C., and has the hardness difference between the weld zone and the matrix is 10 to 40 in range and a ratio between the bead thickness of the weld zone and the thickness of the matrix is 1.05 to 1.3.

Ferritic stainless steel welded pipe superior in expandability

A Cr-bearing heat-resistant steel sheet with excellent workability comprising, in mass %, C of 0.001% to 0.010%, Si of 0.01% to 0.60%, Mn of 0.05% to 0.60%, P of 0.01% to 0.04%, S of 0.0005% to 0.0100%, Cr of 14% to 19%, N of 0.001% to 0.020%, Nb of 0.3% to 1.0%, Mo of 0.5% to 2.0% and, as required, one or more of Cu of 0.5% to 3.0%, W of 0.01% to 1.0% and Sn of 0.01% to 1.00%, and/or one or more of Ti of 0.01% to 0.20%, Al of 0.005% to 0.100%, Mg of 0.0002% to 0.0100%, and B of 0.0003% to 0.001%, with the remainder comprising iron and unavoidable impurities, and having an x-ray intensity ratio {111}/({100}+{211}) of 2 or greater in the central region of thickness.

Cr-bearing heat-resistant steel sheet excellent in workability and method for production thereof

The present invention provides a fuel tank or a fuel pipe excellent particularly in the corrosion resistance of the outer surface in a salt damage environment, and is a fuel tank or a fuel pipe excellent in corrosion resistance characterized by: being formed by using a steel sheet or a steel pipe containing Cr of 9.0 to 25.0 mass % as the base material; on the outer surface thereof, having any one or more of welded portions, brazed portions and structurally gapped portions contacting components; and having one or more of metals, whose electrode potential in a 5%-NaCl aqueous solution at 30&#xb0; C. is &#x2212;0.4 V or less relative to a saturated calomel electrode, attached to at least a part or parts of said portion(s) of the outer surface in an electrically conductive manner.

Fuel tank or fuel pipe excellent in corrosion resistance and method for producing the same

The present invention provides: a fuel tank made of a ferritic stainless steel sheet having long lasting corrosion resistance under the environment of the fuel tank and excellent in formability when fabricating the fuel tank; more specifically, a fuel tank made of a ferritic stainless steel sheet containing 10 to 25 mass % of Cr and having an average r-value of 1.9 or larger, an r-value in-plane anisotropy &Dgr;r of 1.0 or smaller, and a total elongation of 30% or larger, having a plane intensity ratio I(111)/I(100) of 10 or larger, and having lubricant films on the surfaces of the steel sheet and a surface friction coefficient of 0.10 or less.

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Tokyo, Japan

Naoto Ono