	US 12,188,111 B2
	Austenitic stainless steel material
Takahiro Osuki, Tokyo (JP); Shinnosuke Kurihara, Tokyo (JP); Kana Jotoku, Tokyo (JP); Yuhei Suzuki, Tokyo (JP); and Shohgo Aota, Tokyo (JP)
Assigned to NIPPON STEEL CORPORATION, Tokyo (JP)
Appl. No. 17/757,126
Filed by NIPPON STEEL CORPORATION, Marunouchi (JP)
PCT Filed Jan. 8, 2021, PCT No. PCT/JP2021/000448 § 371(c)(1), (2) Date Jun. 9, 2022, PCT Pub. No. WO2021/141107, PCT Pub. Date Jul. 15, 2021.
Claims priority of application No. 2020-003010 (JP), filed on Jan. 10, 2020.
Prior Publication US 2022/0411908 A1, Dec. 29, 2022
Int. Cl. C22C 38/58 (2006.01); C21D 8/02 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/44 (2006.01); C22C 38/48 (2006.01); C22C 38/54 (2006.01)

CPC C22C 38/58 (2013.01) [C21D 8/0205 (2013.01); C22C 38/001 (2013.01); C22C 38/02 (2013.01); C22C 38/44 (2013.01); C22C 38/48 (2013.01); C22C 38/54 (2013.01); C21D 2211/001 (2013.01)]

2 Claims

1. An austenitic stainless steel material, comprising:

a chemical composition consisting of, in mass %,

C: 0.030% or less,

Si: 1.50% or less,

Mn: 2.00% or less,

P: 0.045% or less,

S: 0.0300% or less,

Cr: 15.00 to 25.00%,

Ni: 8.00 to 20.00%,

N: 0.050 to 0.250%,

Nb: 0.10 to 1.00%,

Mo: 0.05 to 5.00%,

B: 0.0005 to 0.0100%,

Ti: 0 to 0.50%,

Ta: 0 to 0.50%,

V: 0 to 1.00%,

Zr: 0 to 0.10%,

Hf: 0 to 0.10%,

Cu: 0 to 4.00%,

W: 0 to 5.00%,

Co: 0 to 1.00%,

sol. Al: 0 to 0.100%,

Ca: 0 to 0.0200%,

Mg: 0 to 0.0200%,

rare earth metal: 0 to 0.100%,

Sn: 0 to 0.010%,

As: 0 to 0.010%,

Zn: 0 to 0.010%,

Pb: 0 to 0.010%, and

Sb: 0 to 0.010%,

with the balance being Fe and impurities,

wherein

a ratio of a dissolved N amount (mass %) in the austenitic stainless steel material with respect to a content of N (mass %) in the austenitic stainless steel material is 0.40 to 0.90.