Heat resistant ferritic steel and method for producing the same
US-9657383-B2 · May 23, 2017 · US
Substrate stainless steel sheet for fuel cell separators and production method therefor
US2020227760A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2020227760-A1 |
| Application number | US-201816483147-A |
| Country | US |
| Kind code | A1 |
| Filing date | Jan 25, 2018 |
| Priority date | Feb 9, 2017 |
| Publication date | Jul 16, 2020 |
| Grant date | — |
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Abstract
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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.
First claim
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1 . A substrate stainless steel sheet for fuel cell separators, wherein the substrate stainless steel sheet has [chemical form other than metal (Cr+Fe)]/[metal chemical form (Cr+Fe)] of 12.0 or more and 200 or less, [chemical form other than metal (Cr+Fe)]/[metal chemical 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 chemical form at a substrate stainless steel sheet surface, and wherein [metal chemical form (Cr+Fe)] is a total atomic concentration of Cr and Fe existing in metal chemical form and [chemical form other than metal (Cr+Fe)] is a total atomic concentration of Cr and Fe existing in chemical form other than metal, which are measured by analyzing the substrate stainless steel sheet surface by X-ray photoelectron spectroscopy. 2 . A production method for a substrate stainless steel sheet for fuel cell separators, comprising: preparing a stainless steel sheet as a material; and subjecting the stainless steel sheet to heat treatment of holding in an atmosphere containing 1 vol. % or more oxygen and in a temperature range of 350° C. or more to 750° C. or less for 1 second or more and 10 minutes or less to thereby set [chemical form other than metal (Cr+Fe)]/[metal chemical form (Cr+Fe)] at 12.0 or more and 200 or less, [chemical form other than metal (Cr+Fe)]/[metal chemical 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 chemical form at a stainless steel sheet surface, wherein [metal chemical form (Cr+Fe)] is a total atomic concentration of Cr and Fe existing in metal chemical form and [chemical form other than metal (Cr+Fe)] is a total atomic concentration of Cr and Fe existing in chemical form other than metal, which are measured by analyzing the stainless steel sheet surface after heat treatment by X-ray photoelectron spectroscopy.
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Classifications
Manufacturing or production processes characterised by the final manufactured product · CPC title
Fuel cells · CPC title
with titanium or zirconium · CPC title
with copper · CPC title
Very low carbon steels, i.e. having a carbon content of less than 0,01% · CPC title
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- What does patent US2020227760A1 cover?
- 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.
- Who is the assignee on this patent?
- Jfe Steel Corp
- What technology area does this patent fall under?
- Primary CPC classification C23C8/14. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Thu Jul 16 2020 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).