Jfe Steel Corporation

Other

Takayoshi Yano

Shin Ishikawa

Chikara Kami

Reiko Sugihara

Kunio Fukuda

Yasuhiro Yamaguchi

Katsuya Hoshino

Tatsuya Miyoshi

Junichiro Hirasawa

Shinji Ootsuka

Tetsuyuki Nakamura

Masataka Yoshino

Katsuhisa Yamauchi

Hideya Matsumoto

Muhammad Febry

Tomoyuki Arizono

Having a chemical composition (1) containing 0.15 mass % to 1.00 mass % of Nb, and (2) containing 0.0005 mass % to 0.0100 mass % of Mg, where (3) the Al content is controlled in a range of 0.55 mass % to 2.00 mass %, and (4) a relationship of 0.0004≤[Mg]/[Al]≤0.0050 is further satisfied.

Ferritic stainless steel for solid oxide fuel cell

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

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 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).

Ferritic stainless steel

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 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.

A stainless steel sheet for fuel cell separators including a substrate made of stainless steel sheet, and low-electrical-resistivity metal particles, where the substrate has a textured structure formed on a surface thereof with the average interval between the projected parts of the textured structure being 10 nm or more and 300 nm or less, the low-electrical-resistivity metal particles have an average particle size of 50 nm to 1.0 &#x3bc;m, the low-electrical-resistivity metal particles are attached to the surface of the substrate having the textured structure at a density of 1.0 particle or more for 1 &#x3bc;m, and a ratio of the average particle size of the low-electrical-resistivity metal particles to the average interval between the projected parts is 1.0 to 15.0.

Stainless steel sheet for fuel cell separators and method for producing the same

A metal sheet for separators of polymer electrolyte fuel cells comprises: a substrate made of metal; and a surface-coating layer with which a surface of the substrate is coated, with a strike layer in between, wherein a coating ratio of the strike layer on the substrate is 2% to 70%, the strike layer is distributed in a form of islands, and a maximum diameter of the islands of the strike layer as coating portions is 1.00 &#x3bc;m or less and is not greater than a thickness of the surface-coating layer.

Metal sheet for separators of polymer electrolyte fuel cells, and metal sheet for manufacturing the same

The surface of a substrate made of stainless-steel foil is coated with a Sn alloy layer, with a strike layer in between. The coverage of the strike layer on the substrate is 2% to 70%.

Stainless-steel foil for separator of polymer electrolyte fuel cell

A stainless steel sheet for a separator of a polymer electrolyte fuel cell includes a substrate made of stainless steel and a Sn alloy layer with which a surface of the substrate is coated. The Sn alloy layer includes 10 or more and 10,000 or fewer microcracks per cm, where the microcrack is defined as a crack having a crack width that is at least 0.1 times the thickness of the Sn alloy layer and no more than 10 &#x3bc;m.

Stainless steel sheet for separator of polymer electrolyte fuel cell

The surface of a substrate made of stainless steel foil is coated with a Sn alloy layer, with a strike layer in between. The coating weight of the strike layer is 0.001 g/mto 1 g/m.

Stainless steel foil for separators of polymer electrolyte fuel cells

In order to obtain a cold rolled steel sheet having excellent press formability, a cold rolled steel sheet has, on a surface thereof, an organic-inorganic composite film containing: an organic resin; and a crystalline layered material. The organic-inorganic composite film has an average film thickness of 0.10 to 2.0 &#x3bc;m and contains 0.5 part or more by weight of the crystalline layered material as a solid with respect to 100 parts by weight of a solid of the organic resin. The crystalline layered material preferably is, for example, a layered double hydroxide represented by [MM(OH)][A].zHO, where: Mis one or more of Mg, Ca, Fe, Ni, and Zn; Mis one or more of Al, Fe, and Cr; and Ais one or more of OH, CO, Cl, and (SO).

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Tokyo, Japan

Takayoshi Yano