Jfe Steel Corporation

Other

Nec Corporation

Shin Ishikawa

Takayoshi Yano

Kunio Fukuda

Chikara Kami

Tomohiro Ishii

Tetsuyuki Nakamura

Shinsuke Ide

Yasushi Kato

Osamu Furukimi

Takumi Ujiro

Reiko Sugihara

Mitsuyuki Fujisawa

Kenji Takao

Noriko Makiishi

Hiroki Ota

Masayasu Nagoshi

Junichiro Hirasawa

Hiroyuki Ogata

Katsuhisa Yamauchi

Atsutaka Honda

Manami Ichikawa

Takeshi Yokota

Takashi Kawano

Atsushi Miyazaki

Yasuhiro Yamaguchi

Takeshi Nishiyama

Takuya Murakami

Takahiro Kubota

Akito Mizutani

Takako Yamashita

Kazuhide Ishii

Shinji Ootsuka

Kazumichi Sashi

Naoki Nishiyama

Takahiko Oshige

Shigeru Takano

Yoshie Obata

Kazuo Fukagai

Yoshihito Sakamoto

Hideya Matsumoto

Hideaki Yamashita

Shinsuki Ide

Naoya Kiyokane

Tomoyuki Arizono

The present invention provides a chromium-containing steel sheet for a current collector of a nonaqueous electrolyte secondary battery which has excellent corrosion resistance in a battery environment and, when used as a current collector of a nonaqueous electrolyte secondary battery, which enables the nonaqueous electrolyte secondary battery to have excellent cycle characteristics. A chromium-containing steel sheet for a current collector of a nonaqueous electrolyte secondary battery has a chemical composition containing 10% by mass or more of Cr. The chromium-containing steel sheet has an irregular structure including recesses and protrusions at a surface thereof. The average height of the protrusions is 20 nm or more and 100 nm or less, and the average spacing between the protrusions is 20 nm or more and 300 nm or less.

Chromium-containing steel sheet for current collector of nonaqueous electrolyte secondary battery and method for manufacturing the same

A photographing condition determining method includes: photographing a part of a metal structure of a metal material subjected to predetermined sample preparation under a predetermined photographing condition; assigning, to pixels corresponding to one or a plurality of predetermined phases of the metal structure, labels of respective phases for a photographed image; calculating one or more feature values for a pixel to which a label of one of the assigned phases; classifying the phases of the metal structure of the image by inputting a calculated feature value to a model, which has been learned in advance using feature values assigned with labels of respective phases as input and labels of the respective phases as output, and acquiring a label of a phase of a pixel corresponding to the input feature value; and determining a photographing condition when other parts of the metal structure are photographed based on a classification result.

Photographing condition determining method for metal structure, photographing method for metal structure, phase classification method for metal structure, photographing condition determining device for metal structure, photographing device for metal structure, phase classification device for metal structure, material property estimating method for metal material, and material property estimating device for metal material

An austenitic stainless steel sheet for fuel cell separators comprises a textured structure at a surface of the stainless steel sheet, the textured structure having recessed parts and projected parts, an average height of the projected parts being 30 nm or more and 300 nm or less, and an average interval between the projected parts being 20 nm or more and 350 nm or less, wherein a ratio [Cr]/[Fe] of an atomic concentration of Cr existing in chemical form other than metal to an atomic concentration of Fe existing in chemical form other than metal at the surface of the stainless steel sheet is 1.0 or more.

Austenitic stainless steel sheet for fuel cell separators and production method therefor

A production method for a stainless steel sheet for fuel cell separators comprises: preparing a stainless steel sheet as a material; thereafter removing an oxide layer at a surface of the stainless steel sheet; and thereafter subjecting the stainless steel sheet to electrolytic etching treatment in an active region of the stainless steel sheet.

Production method for stainless steel sheet for fuel cell separators

A substrate stainless steel sheet has [chemical form other than metal (Cr+Fe)]/[metal form (Cr+Fe)] of 12.0 or more and 200 or less, [chemical form other than metal (Cr+Fe)]/[metal form (Cr+Fe)] being a ratio of a total of Cr and Fe existing in chemical form other than metal to a total of Cr and Fe existing in metal form at a substrate stainless steel sheet surface.

Substrate stainless steel sheet for fuel cell separators and production method therefor

Provided is a ferritic stainless steel having excellent brazability and excellent corrosion resistance to condensed water in an environment in which the ferritic stainless steel is used for an exhaust heat recovery device or an EGR cooler. The ferritic stainless steel has a composition containing, in mass %, C: 0.025% or less, Si: 0.01% or more and less than 0.40%, Mn: 0.05 to 1.5%, P: 0.05% or less, S: 0.01% or less, Cr: 17.0 to 30.0%, Mo: 1.10 to 3.0%, Ni: more than 0.80% and 3.0% or less, Nb: 0.20 to 0.80%, Al: 0.001 to 0.10%, and N: 0.025% or less, with the balance being Fe and incidental impurities, and satisfying the following expression (1) and expression (2):C+N&#x2264;0.030%&#x2003;&#x2003;(1)Cr+Mo&#x2265;19.0%&#x2003;&#x2003;(2)

Ferritic stainless steel

Provided is ferritic stainless steel having excellent brazeability and excellent corrosion resistance to condensed water in an environment in which the steel is used for an exhaust heat recovery device or an EGR cooler. A ferritic stainless steel has a chemical composition containing, by mass %, C: 0.025% or less, Si: 0.40% to 2.0%, Mn: 0.05% to 1.5%, P: 0.05% or less, S: 0.01% or less, Cr: 16.0% to 30.0%, Mo: 0.60% to 3.0%, Ni: 0.10% to 2.5%, Nb: 0.20% to 0.80%, Al: 0.001% to 0.15%, N: 0.025% or less, and the balance being Fe and inevitable impurities, in which relational expressions (1) and (2) below are satisfied.C+N&#x2264;0.030%&#x2003;&#x2003;(1),2Si+Ni&#x2265;1.0%&#x2003;&#x2003;(2),(in relational expressions (1) and (2), C, N, Si, and Ni each denote the contents (mass %) of the corresponding elements).

Provided is a ferritic stainless steel that has good corrosion resistance and which exhibits good brazeability when subjected to high-temperature brazing with a Ni-containing brazing filler metal. The ferritic stainless steel has a composition containing, in mass %, C: 0.003 to 0.020%, Si: 0.05 to 0.60%, Mn: 0.05 to 0.50%, P: 0.04% or less, S: 0.02% or less, Cr: 17.0 to 24.0%, Ni: 0.20 to 0.80%, Cu: 0.01 to 0.80%, Mo: 0.01 to 2.50%, Al: 0.001 to 0.015%, Nb: 0.25 to 0.60%, and N: 0.020% or less, with the balance being Fe and incidental impurities, the composition satisfying formula (1) below and formula (2) below,Cu+Mo&#x2265;0.30&#x2003;&#x2003;(1)4Ni&#x2212;(Si+Mn)&#x2265;0&#x2003;&#x2003;(2)(wherein Cu and Mo in formula (1) and Ni, Si, and Mn in formula (2) each represent the content (mass %) of the corresponding element).

A stainless steel sheet for fuel cell separators comprises a predetermined chemical composition, wherein the stainless steel sheet has a textured structure at a surface thereof, an average interval between projected parts of the textured structure being 20 nm or more and 200 nm or less, and a ratio [Cr]/[Fe] of an atomic concentration of Cr existing in chemical form other than metal to an atomic concentration of Fe existing in chemical form other than metal at the surface of the stainless steel sheet is 2.0 or more.

Stainless steel sheet for fuel cell separators and production method therefor

A martensitic stainless steel sheet comprises a chemical composition containing, in mass %, C: 0.035% to 0.090%, Si: 0.01% to 1.0%, Mn: 0.01% to 0.90%, P: 0.050% or less, S: 0.050% or less, Cr: 10.0% to 14.0%, Ni: 0.01% to 0.40%, Al: 0.001% to 0.50%, V: 0.05% to 0.50%, and N: 0.050% to 0.20%, with the balance being Fe and inevitable impurities, wherein a content of C and a content of N in the chemical composition satisfy C %+N % 0.10% and N % C %, the number of precipitates with a major axis length of 200 nm or more in a surface layer of the martensitic stainless steel sheet is 25 or less per 100 &#x3bc;m, and the martensitic stainless steel sheet has a tensile strength of 1300 MPa or more, a proof stress of 1100 MPa or more, and an elongation of 8.0% or more.

Martensitic stainless steel sheet

A martensitic stainless steel has a chemical composition containing, by mass %, C: 0.030% or more and less than 0.20%, Si: 0.01% or more and 2.0% or less, Mn: 0.01% or more and 3.0% or less, P: 0.050% or less , S: 0.010% or less, Cr: 10.0% or more and 16.0% or less, Ni: 0.01% or more and 0.80% or less, Al: 0.001% or more and 0.50% or less, Zr: 0.005% or more and 0.50% or less, and N: 0.030% or more and less than 0.20%, with the balance consisting of Fe and inevitable impurities.

Stainless steel sheets including a Ni and O-containing coating on the surface that has excellent weld penetration characteristics and excellent crevice corrosion resistance, and a method for producing such stainless steel sheets. A stainless steel sheet includes a Ni and O-containing coating on a surface of the stainless steel sheet. The Ni and O-containing coating has a coating weight of greater than or equal to 0.1 g/mand less than or equal to 20 g/m. The Ni and O-containing coating has a composition including, in at. %, Ni: greater than or equal to 25% and less than or equal to 60%, and O: greater than or equal to 40% and less than or equal to 70%.

Stainless steel sheet including Ni and O-containing coating on surface and method for producing stainless steel sheet

Provided is a ferritic stainless steel excellent in oxidation resistance and thermal fatigue resistance. The ferritic stainless steel contains, in mass %, C: 0.020% or less, Si: more than 0.1% and 3.0% or less, Mn: 0.05 to 2.0%, P: 0.050% or less, S: 0.010% or less, Al: 0.3 to 6.0%, N: 0.020% or less, Cr: 12 to 30%, Nb: more than 0.3% and 1.0% or less, Ti: 0.01 to 0.5%, Mo: 0.3 to 6.0%, Co: 0.01 to 3.0%, and Ni: 0.02 to 1.0%, the balance being Fe and unavoidable impurities. Moreover, Si+Al&#x3e;1.0%, Al&#x2014;Mn&#x3e;0%, and Nb&#x2014;Ti&#x3e;0% hold.

A stainless steel sheet for fuel cell separators comprises: a predetermined chemical composition; and Cr-containing fine precipitates at a steel sheet surface, wherein an average equivalent circular diameter of the fine precipitates is 20 nm or more and 500 nm or less, and a number of the fine precipitates existing per 1 &#x3bc;mat the steel sheet surface is three or more.

Stainless steel sheet for fuel cell separators, and production method therefor

A stainless steel sheet for fuel cell separators comprises: a predetermined chemical composition; and fine precipitates containing Cr and Ti at a steel sheet surface, wherein an average equivalent circular diameter of the fine precipitates is 20 nm or more and 500 nm or less, and a number of the fine precipitates existing per 1 &#x3bc;mat the steel sheet surface is three or more.

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Tokyo, Japan

Shin Ishikawa