Al coating layer-equipped stainless steel sheet

Patent metadata

Field	Value
Publication number	US-12534810-B2
Application number	US-202118000128-A
Country	US
Kind code	B2
Filing date	Apr 20, 2021
Priority date	Jul 1, 2020
Publication date	Jan 27, 2026
Grant date	Jan 27, 2026

Abstract

An Al coating layer-equipped stainless steel sheet having a base steel sheet and an Al coating layer on a surface of the base steel sheet. In the Al coating layer-equipped stainless steel sheet, the base steel sheet is a stainless steel sheet having a thickness of 100 μm or less and a predetermined chemical composition, the Al coating layer has a thickness of 0.5 μm to 10.0 μm, and a total content of Fe and Cr at a first depth of the Al coating layer is 20 mass % to 70 mass %.

First claim

The invention claimed is:

1 . An Al coating layer-equipped stainless steel sheet comprising:
a base steel sheet; and an Al coating layer on a surface of the base steel sheet, wherein the base steel sheet is a stainless steel sheet having a thickness of 100 μm or less and a chemical composition containing, in mass %, C: 0.030% or less, Si: 1.00% or less, Mn: 1.00% or less, P: 0.040% or less, S: 0.010% or less, Cr: 11.0% to 30.0%, Al: 1.53% to 6.50%, Ni: 0.01% to 0.50%, and N: 0.020% or less, with a balance consisting of Fe and inevitable impurities, a thickness of the Al coating layer is 0.5 μm to 3.5 μm, and a total content of Fe and Cr at a first depth of the Al coating layer is 20 mass % to 70 mass %, where the first depth of the Al coating layer is a depth of (depth a +depth b)/2 from a surface of the Al coating layer, the depth a is a depth at which an Al strength is [maximum Al strength]/2, in a depth region from the surface of the Al coating layer to a point A of an Al concentration profile in a depth direction, the point A being a depth at which the Al strength is the maximum Al strength in the Al concentration profile, and the depth b is a depth at which the Al strength is ([maximum Al strength]+[Al strength corresponding to the Al content in the base steel sheet])/2, in a depth region from the point A to an interface between the base steel sheet and the Al coating layer of the Al concentration profile.

2 . The Al coating layer-equipped stainless steel sheet according to claim 1 , wherein the chemical composition of the base steel sheet further contains, in mass %, one or more selected from the group consisting of
Cu: 0.10% or less, Ti: 0.50% or less, Nb: 0.50% or less, V: 0.50% or less, Zr: 0.20% or less, Hf: 0.20% or less, Mo: 6.00% or less, W: 6.00% or less, B: 0.0050% or less, REM: 0.20% or less, Ca: 0.0100% or less, and Mg: 0.0100% or less.

Assignees

• Jfe Steel Corp

Inventors

• Mizutani Akito
• Fujisawa Mitsuyuki

Classifications

• C22C38/40

  with nickel · CPC title

• C22C38/06

  containing aluminium · CPC title

• C22C38/04

  containing manganese · CPC title

• C22C38/02

  containing silicon · CPC title

• C23C30/005 Primary

  on hard metal substrates · CPC title