Nippon Steel & Sumikin Stainless Steel Corporation

Nippon Steel Corporation

Nippon Steel Stainless Steel Corporation

Toshio Tanoue

Junichi Hamada

Yoshiharu Inoue

Naoto Ono

Shunji Sakamoto

Fumio Fudanoki

Masao Kikuchi

Shinichi Teraoka

Akihiko Takahashi

Haruhiko Kajimura

Tadashi Komori

Yuji Koyama

Hiroshi Urashima

Kiyoshi Yamaji

Masaaki Kobayashi

Kenji Kato

Jun Araki

Shuji Yamamoto

Ken Kimura

Michio Kaneko

Katsuhiko Kato

Yujiro Miyauchi

Masayuki Tendo

Isao Anai

Kou Nishimura

Itsuro Hiroshige

Nozomu Fukuda

A ferritic stainless steel sheet and a steel pipe as a material suitable for a heat-resistant component that is required to have especially excellent formability are provided. The ferritic stainless steel sheet contains 10 to 20 mass % of Cr and a predetermined amount of C, Si, Mn, P, S, Al and one or both of Ti and Nb, a {111}-orientation intensity being 5 or more and {411}-orientation intensity being less than 3 at a portion in the vicinity of a sheet-thickness central portion of the ferritic stainless steel sheet. Further, with similar composition and by setting {111}&#x3c;110&#x3e;-orientation intensity at 4.0 or more and {311}&#x3c;136&#x3e;-orientation intensity at less than 3.0, a relationship r&#x2265;&#x2212;1.0t+3.0 (t(mm): sheet thickness, r: average r-value) is satisfied, thereby providing a ferritic stainless steel sheet and a steel pipe with excellent formability.

Ferrite-based stainless steel plate, steel pipe, and production method therefor

An automotive member or oil filler pipe includes: a member of ferritic stainless steel containing, in mass %, at most 0.015% of C, at most 0.015% of N, 10.5 to 18.0% of Cr, 0.01 to 0.80% of Si, 0.01 to 0.80% of Mn, at most 0.050% of P, at most 0.010% of S, 0.010 to 0.100% of Al, more than 0.3 to 1.5% of Mo, and one or both of 0.03 to 0.30% of Ti and Nb; and a metal fitting of an aluminized stainless steel sheet, which is attached to the member to define therebetween a gap structure to be exposed to a chloride environment, and has an Al-plating weight per unit area ranging from 20 to 150 g/min the gap structure. Surfaces of the metal fitting and member not facing the gap are coated with a cation electrodeposition coating film having a thickness of 5 to 35 &#x3bc;m.

Inexpensive automobile component and oil feed pipe having excellent salt corrosion resistance

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

An automotive member or a feed oil pipe includes: a member made of a ferritic stainless steel containing predetermined components containing 10.5% to 18.0% of Cr in mass %; a metal fitting made of an aluminized stainless steel sheet, the metal fitting being attached to the member; and a gap structure defined between the member and the metal fitting, the gap structure being exposed to a chloride environment, where the metal fitting has an Al-plating weight per unit area of 20 g/mor more and 150 g/mor less on a surface corresponding to a gap of the gap structure, and surfaces of the metal fitting and the non-aluminized member other than the gap are coated with a cation electrodeposition coating film having a thickness of 5 &#x3bc;m to 35 &#x3bc;m.

Inexpensive automotive member and feed oil pipe, exhibiting excellent salt corrosion resistance

The present invention is directed to a stainless steel brake disc which is excellent in toughness, corrosion resistance, and wear resistance, and comprises, in % by mass, 0.030 to 0.080% of C, 0.05% to 1.0% of Si, 1.0 to 1.5% of Mn, 0.035% or less of P, 0.015% or less of S, 11.0 to 14.0% of Cr, 0.01 to 0.50% of Ni, 0.001 to 0.15% of V, less than 0.1% of Nb, 0.05% or less of Ti, 0.05% or less of Zr, 0.05% or less of Al, 0.015 to 0.060% of N, 0.0002% or more and 0.0050% or less of B, and 0.0080% or less of O, wherein an AT value of equation 1 is 0.055 to 0.090, equation 2 is satisfied, a ferrite phase fraction, in which an IQ value of an EBSD pattern is 4,000 or more, is 1% to 15%, a Charpy impact value is 50 J/cmor more, and hardness is 32 to 38 HRC.C+0.8(N&#x2212;B)&#x2003;&#x2003;(1)PV=1.2Ti+0.8Zr+Nb+1.1Al+O&#x2266;0.1&#x2003;&#x2003;(2)

Stainless steel brake disc and method for production thereof

A fuel pipe which is inexpensive and is excellent in salt spray corrosion resistance, characterized by being comprised of a steel pipe member having as a material a ferritic stainless steel which contains, by mass %, C: 0.015% or less, Si: 0.01 to 0.50%, Mn: 0.01 to 0.50%, P: 0.050% or less, S: 0.010% or less, N: 0.015% or less, Al: 0.010 to 0.100%, and Cr: 13.0 to 18.0% and further, one or both of Ti: 0.03 to 0.30% and Nb: 0.03 to 0.30% and a metal fitting part, the metal fitting part and the steel pipe member having between them a crevice structure at the surface which the structure is exposed to a salt spray environment, an opening amount at a crevice part of the crevice structure being 0.2 mm or more, and an inside of the crevice part being coated by electrodeposition.

Fuel pipe and method of production of same

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, as a material superior in heat resistance in a hot environment where the maximum temperature of the exhaust gas becomes 750 to 900&#xb0; C., ferritic stainless steel sheet superior in heat resistance in a broad temperature region of 750 to 900&#xb0; C. with long term stability by a smaller amount of addition of Mo than SUS444 containing about 2% of expensive Mo, that is, ferritic stainless steel sheet superior in heat resistance characterized by containing, by mass %, C: 0.01% or less, N: 0.02% or less, Si: 0.05 to 1%, Mn: 0.1 to 2%, Cr: 10 to 30%, Mo: 0.1 to 1%, Cu: 1 to 2%, Nb: 0.2 to 0.7%, Ti: 0.01 to 0.3%, and B: 0.0002 to 0.0050%, having a balance of Fe and unavoidable impurities, and having a 0.2% yield strength at 750&#xb0; C. of 70 MPa or more.

Ferritic stainless steel sheet superior in heat resistance

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

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

Lubricative stainless steel sheet and pipe having a chromate film on at least one of the surfaces of a stainless steel sheet or pipe substrate, the chromate film having an amount of adhered Cr of 5 to 100 mg/m , and, on the chromate film, a lubricant film obtained by applying, on the chromate film, a water-base coating containing (a) a urethane resin of ether-ester type having a skeleton of bisphenol type, a skeleton of ester, and a carboxyl group, (b) an epoxy resin, and (c) a polyolefin wax, and baking the applied coating, the sum of the amount of the urethane resin of (a) and the epoxy resin of (b) being 70 to 95% by weight of the total solids of the coating, the amount of the polyolefin wax of (c) being 5 to 30% by weight of the total solids of the coating, and the lubricant film having a thickness of 0.5 to 5 micrometers and a Vickers hardness of at least 15. A method of producing a lubricative stainless steel pipe is also disclosed.

Lubricative stainless steel sheets and pipes and method of producing lubricative stainless steel pipes

Brake disc produced by a hot-rolled stainless steel excellent in resistance to temper softening, characterized in that: said steel contains, in terms of wt %, C: 0.01 to 0.1%, N: 0.03% or less, C&plus;N: 0.04 to 0.1%, Si: 1% or less, Mn: 20 or less, Ni: less than 0.5%, Cr: 10 to 15%, and Nb: 0.02% to 0.5%, with the balance Fe and unavoidable impurities; that the hardness after quenching heat treatment is in the range of 30 to 40 HRC; and that the temper softening temperature for lowering the hardness to below 30 HRC is at least 530&deg; C. Further, it is desirable to add at least one of the following elements; 0.1 to 2% of Cu, 0.1 to 1% of Mo, 0.01 to 0.5% of Ti, 0.01 to 0.5% of V or 0.0005 to 0.01% of B, and to make the value of &ggr; calculated from steel chemical composition at least 70%.

Stainless steel for brake disc excellent in resistance to temper softening

A brake disc capable of being used in an as quenched state, excellent in rusting resistance, toughness and resistance to softening resulting from heat generation caused by braking, and preferably useful as a brake disc for a two-wheeled vehicle, which is produced from a martensitic stainless steel comprising 0.02 to 0.10% of C, up to 0.03% of N, up to 0.05% of Si, 0.5 to 1.5% of Mn, up to 0.5% of Ni, 10 to 15% of Cr, 0.5 to 2.5% of Cu, up to 0.1% of Al and the balance substantially Fe and unavoidable impurities provided that the amount of C+N is from 0.05 to 0.1% and .gamma.p is at least 90, and a process for producing the same.

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Tokyo, Japan

Toshio Tanoue