Nippon Steel & Sumikin Stainless Steel Corporation

Nippon Steel Corporation

Hitachi Industrial Equipment Systems Co., Ltd.

Nippon Steel Stainless Steel Corporation

Sumikin Stainless Steel Corporation

Nippon Steel Sumitomo Metal Corporation

Eiichiro Ishimaru

Masaharu Hatano

Akihiko Takahashi

Ken Kimura

Shinichi Teraoka

Junichi Hamada

Hiroshige Inoue

Hideaki Yamamura

Hideki Oka

Kazuyuki Fukui

Masao Hosokawa

Kouji Yamashita

Isao Suichi

Izumi Muto

Shin-ichi Teraoka

Mitsuaki Kawashima

Takashi Arai

Masafumi Miyazaki

Yasushi Kurisu

Eiichi Takeuchi

Naoya Hamada

Toshiyuki Suehiro

Mamoru Yamada

Tadahiro Izu

Kazumi Seki

Mitsuru Nakayama

Yasuo Maruki

Akihito Yamagishi

Naoto Hansaki

Takeshi Kubota

Yousuke Kurosaki

Haruhiko Kajimura

Nobuhiko Hiraide

Yoshihiro Arita

Kenji Kosuge

Hiroyuki Matsuyama

Tetsurou Takeshita

Tooru Matsuhashi

Shunji Shoda

Yoshikatsu Nohara

Shuichi Inoue

Kenji Hattori

Yoshimori Fukuda

Toyohiko Kakihara

Michio Nakata

Takuya Sakuraba

Yuji Kaga

Satoshi Sampei

Shigenori Takahata

This clear-coated stainless steel sheet () includes a stainless steel sheet (), and a clear-coated film () formed on at least one surface () of the stainless steel sheet () and having an average film thickness of 0.05 μm or more and 3.00 μm or less.

Clear-coated stainless steel sheet

A welded structure including a base material made of duplex stainless steel and a welded portion formed by welding the base materials to each other, wherein the base material has a predetermined chemical composition, a volume fraction of a ferrite phase in a metallographic structure of a weld metal of the welded portion is 45 to 75%, a ratio of a hardness of the weld metal to a hardness of the base material is 0.80 to 1.20, and an amount of precipitates formed in the ferrite phase of the weld metal is less than 10% in area fraction.

Welded structure and storage tank

A Cr-containing ferritic stainless steel sheet is desired with improved corrosion resistance and rust resistance as well as improved ridging resistance. To achieve these results, the ferritic stainless steel sheet derives the relationship between Ap, which shows the &#x3b3;-phase rate at 1100&#xb0; C. due to a predetermined ingredient, and Sn in ferritic stainless steel which becomes a dual phase structure of &#x3b1;+&#x3b3; in the hot rolling temperature region, applies and adds Sn, and hot rolls the steel to give a total rolling rate of 15% or more in 1100&#xb0; C. or higher hot rolling to thereby obtain ferritic stainless steel sheet which has good ridging resistance, which also has excellent corrosion resistance and rust resistance, and which can be applied to general durable consumer goods, wherein 0.060&#x2264;Sn&#x2264;0.634&#x2212;0.0082Ap and 10&#x2264;Ap&#x2264;70.

Ferritic stainless steel plate which has excellent ridging resistance and method of production of same

A ferritic stainless steel sheet containing, by mass %, C: 0.020% or less, Cr: 10.0% to 25.0%, N: 0.020% or less, Sn: 0.010% to 0.50%, and one or more of Ti: 0.60% or less, Nb: 0.60% or less, V: 0.60% or less, and Zr: 0.60% or less so as to satisfy Equation (1): (Ti/48+V/51+Zr/91+Nb/93)/(C/12+N/14)&#x2265;1.0, wherein a difference between a stress &#x3c3;1 (N/mm) after prestrain imparting tensile deformation with 7.5% of strain, and an upper yield stress &#x3c3;2 (N/mm) when the steel sheet is subjected to heat treatment at 200&#xb0; C. for 30 minutes and then to tension again after the tensile deformation is 8 or less.

Ferritic stainless steel sheet exhibiting small increase in strength after aging heat treatment, and method of producing the same

Ferritic stainless steel sheet which is excellent in ridging resistance which comprises, by mass %, Cr: 10 to 30%, Sn: 0.005 to 1%, C: 0.001 to 0.1%, N: 0.001 to 0.1%, Si: 0.01 to 3.0%, Mn: 0.01 to 3.0%, P: 0.005 to 0.1%, and S: 0.0001 to 0.01% and has a balance of Fe and unavoidable impurities and which has an X-ray diffraction strength in the {100}&#x3c;012&#x3e; orientation from a surface layer to t/4 ('t' is sheet thickness) of 2 or more.

Method of producing ferritic stainless steel sheet

The present invention provides a low-alloy high-purity ferritic stainless steel sheet provided with improved oxidation resistance and high-temperature strength by utilizing Sn addition in trace amounts without relying on excessive alloying of Al and Si which reduces fabricability and weldability or addition of rare elements such as Nb, Mo, W, and rare earths, and a process for producing the same. The high-purity ferritic stainless steel sheet includes C: 0.001 to 0.03%, Si: 0.01 to 2%, Mn: 0.01 to 1.5%, P: 0.005 to 0.05%, S: 0.0001 to 0.01%, Cr: 16 to 30%, N: 0.001 to 0.03%, Al: 0.05 to 3%, and Sn: 0.01 to 1% (% by mass), with the remainder being Fe and unavoidable impurities. A stainless steel slab having such steel components is heated, wherein an extraction temperature is 1100 to 1250&#xb0; C., and a winding temperature after hot rolling is 650&#xb0; C. or lower. A hot-rolled sheet is annealed at 900 to 1050&#xb0; C., and cooled at 10&#xb0; C./sec or less over a temperature range of 550 to 850&#xb0; C.

High-purity ferritic stainless steel sheet with excellent oxidation resistance and high-temperature strength, and process for producing the same

Provided is a stainless steel substrate for a solar cell, the stainless steel substrate including, by mass %, Cr: 9% to 25%, C: 0.03% or less, Mn: 2% or less, P: 0.05% or less, S: 0.01% or less, N: 0.03% or less, Al: 0.005% to 5.0%, Si: 0.05% to 4.0%, and a remainder including Fe and unavoidable impurities, in which an oxide film containing (i) AlOin an amount of 50% or more or containing (i) AlOand (ii) SiOin a total amount of 50% or more is formed on a surface of stainless steel having a composition which contains Al: 0.5% or more and/or Si: 0.4% or more and satisfies the following expression (1).Cr+10Si+Mn+Al&#x3e;24.5&#x2003;&#x2003;(1)

Stainless steel substrate for solar cell having superior insulating properties and low thermal expansion coefficient and method of producing the same

A ferritic stainless steel sheet having ridging resistance contains, by mass, 0.025 to 0.30% C, 0.01 to 1.00% Si, 0.01 to 2.00% Mn, 0.050% or less P, 0.020% or less S, 11.0 to 22.0% Cr, and 0.022 to 0.10% N. In addition, Ap, which is defined as 420C+470N+23Ni+9Cu+7Mn&#x2212;11.5(Cr+Si)&#x2212;12Mo&#x2212;52Al&#x2212;47Nb&#x2212;49Ti+189 wherein each of Sn, C, N, Ni, Cu, Mn, Cr, Si, Mo, Al, Nb, and Ti denotes the content of the element, satisfies 10&#x2266;Ap&#x2266;70. Furthermore, a content of Sn satisfies 0.060&#x2266;Sn&#x2266;0.634&#x2212;0.0082Ap. Residual ingredients are Fe and unavoidable impurities, and a metal structure of the steel sheet is a ferrite single phase. The ferritic stainless steel sheet has a ridging height of less than 6 &#x3bc;m. This ferritic stainless steel sheet improves the corrosion resistance and rust resistance of Cr-containing ferritic stainless steel as well as the ridging resistance.

An alloy-saving type high purity ferritic stainless steel sheet, comprising a steel sheet which contains, by mass %, C: 0.001 to 0.03%, Si: 0.01 to 1%, Mn: 0.01 to 1.5%, P: 0.005 to 0.05%, S: 0.0001 to 0.01%, Cr: 13 to 30%, N: 0.001 to 0.03%, Al: 0.005 to 1%, and Sn: 0.01 to 1% and has a balance of Fe and unavoidable impurities and which has a surface film, the surface film containing one or both of Al and Si in a total of 5 to 50 at % and Sn, an average concentration of Cr in the surface film being 1.1 to 3 times the concentration of Cr inside the steel sheet, and the surface film having a surface roughness of an arithmetic average roughness Ra of 0.1 to 1.5 &#x3bc;m.

High purity ferritic stainless steel sheet excellent in corrosion resistance and anti-glare property

The present invention provides a ferritic stainless steel comprised of, by mass %, C: 0.001 to 0.02%, Si: 0.01 to 0.6%, Mn: 0.01 to 0.6%, P: 0.005 to 0.04%, S: 0.0001 to 0.01%, Cr: 13 to 22%, N: 0.001 to 0.02%, Al: 0.005 to 0.05%, Sn: 0.001 to 1%, and a balance of Fe and unavoidable impurities, which steel satisfies the following formulae: 0&#x3c;I(Fe)/I(Cr)&#x3c;5 and 0&#x3c;I(O)/I(Sn)&#x3c;3, where I(Fe), I(Cr), I(Sn), and I(O) are the X-ray intensities of the Fe oxides, Cr oxides, Sn oxides, and the sum of X-ray intensities other detected oxides at the steel surface measured by an X-ray photoelectron spectrometer. The present invention also provides a method of producing the ferritic stainless steel.

High-purity ferritic stainless steels excellent in corrosion resistance and method of production of same

Disclosed is a power distribution transformer having a body of the transformer, the body consisting of a coil and an iron core; a tank containing the body of the transformer and an insulation substance which fills an inner space of the tank; and an upper lid of the tank. The tank and/or the upper lid is made of a ferritic stainless steel.

Power distribution transformer and tank therefor

This stainless steel sheet includes, in terms of mass %, C: 0.001 to 0.1%, N: 0.01 to 0.15%, Si: 0.01 to 2%, Mn: 0.1 to 10%, P: 0.05% or less, S: 0.01% or less, Ni: 0.5 to 5%, Cr: 10 to 25%, and Cu: 0.5 to 5%, with a remainder being Fe and unavoidable impurities, and contains a ferrite phase as a main phase and 10% or more of an austenite phase, wherein a work-hardening rate in a strain range of up to 30% is 1000 MPa or more which is measured by a static tensile testing and a difference between static and dynamic stresses which occur when 10% of deformation is caused is 150 MPa or more. This method for producing a stainless steel includes annealing a cold-rolled steel sheet under conditions where a holding temperature is set to be in a range of 950 to 1150&#xb0; C. and a cooling rate until 400&#xb0; C. is set to be in a range of 3&#xb0; C./sec or higher.

Ferrite-austenite stainless steel sheet for structural component excellent in workability and impact-absorbing property and method for producing the same

This ferrite-austenite stainless steel sheet includes: in terms of mass %, C: 0.1% or less; Cr: 17 to 25%; Si: 1% or less; Mn: 3.7% or less; Ni: 0.6 to 3%; Cu: 0.1 to 3%; and N: 0.06% or more and less than 0.15%, with the remainder being Fe and inevitable impurities, wherein the steel sheet has a two-phase structure consisting of a ferrite phase and an austenite phase, a volume fraction of the austenite phase is in a range of 15 to 70%, and in a sheet plane (ND) of a center of a sheet thickness, grains of the ferrite phase having a crystal orientation satisfying ND//{111}&#xb1;10&#xb0; and grains of the ferrite phase having a crystal orientation satisfying ND//{101}&#xb1;10&#xb0; are present in a total content of 10% by area or more.

Ferrite-austenite stainless steel sheet excellent in ridging resistance and workability and process for manufacturing the same

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Hikari, Japan

Eiichiro Ishimaru