Austenitic stainless steel foil

Patent metadata

Field	Value
Publication number	US-12428699-B2
Application number	US-202118031193-A
Country	US
Kind code	B2
Filing date	Oct 12, 2021
Priority date	Oct 13, 2020
Publication date	Sep 30, 2025
Grant date	Sep 30, 2025

Abstract

An austenitic stainless steel foil according to this disclosure consists of, in mass %, C: 0.150% or less, Si: 1.00% or less, Mn: 2.00% or less, P: 0.045% or less, S: 0.0300% or less, Cr: 16.00 to 20.00%, Ni: 6.00 to 10.50%, N: 0.100% or less, Mo: 0 to 2.50%, Nb: 0 to 0.12%, V: 0 to 1.00%, Ta: 0 to 0.50%, Hf: 0 to 0.10%, Co: 0 to 0.50%, B: 0 to 0.0100%, Ca: 0 to 0.0200%, Mg: 0 to 0.0200%, rare earth metal: 0 to 0.0100%, Al: 0 to 0.010%, Ti: 0 to 0.500%, Zr: 0 to 0.100%, and Cu: 0 to 3.00%, with the balance being Fe and impurities. In an X-ray diffraction profile obtained using CuKα radiation, a full width at half maximum Fw of a peak of a {111} plane is greater than 0.366°.

First claim

The invention claimed is:

1. An austenitic stainless steel foil, consisting of, in mass %,
C: 0.150% or less,
Si: 1.00% or less,
Mn: 2.00% or less,
P: 0.045% or less,
S: 0.0300% or less,
Cr: 16.00 to 20.00%,
Ni: 6.00 to 10.50%,
N: 0.100% or less,
Mo: 0 to 2.50%,
Nb: 0 to 0.12%,
V: 0 to 1.00%,
Ta: 0 to 0.50%,
Hf: 0 to 0.10%,
Co: 0 to 0.50%,
B: 0 to 0.0100%,
Ca: 0 to 0.0200%,
Mg: 0 to 0.0200%,
rare earth metal: 0 to 0.0100%,
Al: 0 to 0.010%,
Ti: 0 to 0.500%,
Zr: 0 to 0.100%, and
Cu: 0 to 3.00%,
with the balance being Fe and impurities,
wherein:
in an X-ray diffraction profile obtained using CuKα radiation, a full width at half maximum Fw of a peak of a {111} plane is greater than 0.366°.

2. The austenitic stainless steel foil according to claim 1 , containing one or more of:
Mo: 0.01 to 2.50%,
Nb: 0.01 to 0.12%,
V: 0.01 to 1.00%,
Ta: 0.01 to 0.50%,
Hf: 0.01 to 0.10%,
Co: 0.01 to 0.50%,
B: 0.0001 to 0.0100%,
Ca: 0.0001 to 0.0200%,
Mg: 0.0001 to 0.0200%,
rare earth metal: 0.0001 to 0.0100%,
Al: 0.001 to 0.010%,
Ti: 0.001 to 0.500%,
Zr: 0.001 to 0.100%, and
Cu: 0.01 to 3.00%.

3. The austenitic stainless steel foil according to claim 1 , wherein:
a uniform strain e is less than −2.89×10 −4 .

4. The austenitic stainless steel foil according to claim 2 , wherein:
a uniform strain e is less than −2.89×10 −4 .

5. The austenitic stainless steel foil according to claim 1 , wherein:
in an X-ray diffraction profile obtained using CuKα radiation, a ratio of a lattice spacing {111}γ of {111} planes of an austenite phase to a lattice spacing {110}α′ of {110} planes of a martensite phase satisfies Formula (1);
{111}γ/{110}α′≥1.0220  (1).

6. The austenitic stainless steel foil according to claim 2 , wherein:
in an X-ray diffraction profile obtained using CuKα radiation, a ratio of a lattice spacing {111}γ of {111} planes of an austenite phase to a lattice spacing {110}α′ of {110} planes of a martensite phase satisfies Formula (1);
{111}γ/{110}α′≥1.0220  (1).

7. The austenitic stainless steel foil according to claim 3 , wherein:
in an X-ray diffraction profile obtained using CuKα radiation, a ratio of a lattice spacing {111}γ of {111} planes of an austenite phase to a lattice spacing {110}α′ of {110} planes of a martensite phase satisfies Formula (1);
{111}γ/{110}α′≥1.0220  (1).

8. The austenitic stainless steel foil according to claim 4 , wherein:
in an X-ray diffraction profile obtained using CuKα radiation, a ratio of a lattice spacing {111}γ of {111} planes of an austenite phase to a lattice spacing {110}α′ of {110} planes of a martensite phase satisfies Formula (1);
{111}γ/{110}α′≥1.0220  (1).

Assignees

• Nippon Steel Chemical & Mat Co Ltd

Inventors

• Yonemura Mitsuharu
• Kimura Keiichi
• Hiraga Takuya
• Kuma Yuji

Classifications

• C21D8/02

  during manufacturing of plates or strips (C21D8/12 takes precedence) · CPC title

• C22C38/58 Primary

  with more than 1.5% by weight of manganese · CPC title

• C22C38/02

  containing silicon · CPC title

• C22C38/002

  containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60 · CPC title

• C22C38/001

  containing N · CPC title