Granted Patent B2

US 12,534,810 · App. 18/000,128 · Granted Jan 27, 2026

Inventors: Akito Mizutani (Tokyo, JP); Mitsuyuki Fujisawa (Tokyo, JP)

Assignee: JFE STEEL CORPORATION

C23C30/005C22C38/02C22C38/04C22C38/06C22C38/40

Abstract

Claims (32)

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.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (25)