	US 12,404,574 B2
	Alloy material and method for producing same
Shinji Tsuge, Tokyo (JP); Masatomo Kawa, Tokyo (JP); Yukio Nakamura, Tokyo (JP); Kenichiro Kusunoki, Tokyo (JP); and Yukihiro Nishida, Tokyo (JP)
Assigned to NIPPON STEEL STAINLESS STEEL CORPORATION, Tokyo (JP)
Appl. No. 17/918,337
Filed by NIPPON STEEL STAINLESS STEEL CORPORATION, Tokyo (JP)
PCT Filed Apr. 26, 2021, PCT No. PCT/JP2021/016573 § 371(c)(1), (2) Date Oct. 12, 2022, PCT Pub. No. WO2021/221003, PCT Pub. Date Nov. 4, 2021.
Claims priority of application No. 2020-079036 (JP), filed on Apr. 28, 2020.
Prior Publication US 2023/0143965 A1, May 11, 2023
Int. Cl. C21D 1/26 (2006.01); C21D 1/02 (2006.01); C21D 6/00 (2006.01); C21D 8/02 (2006.01); C22C 38/60 (2006.01); C21D 1/60 (2006.01); C21D 9/46 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); C22C 38/52 (2006.01); C22C 38/54 (2006.01)

CPC C22C 38/60 (2013.01) [C21D 1/02 (2013.01); C21D 1/26 (2013.01); C21D 6/004 (2013.01); C21D 8/0205 (2013.01); C21D 1/60 (2013.01); C21D 8/0242 (2013.01); C21D 8/0247 (2013.01); C21D 9/46 (2013.01); C22C 38/002 (2013.01); C22C 38/005 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/48 (2013.01); C22C 38/52 (2013.01); C22C 38/54 (2013.01)]

5 Claims

1. An alloy material having a chemical composition consisting of, in mass %,

C: 0.010 to 0.10%,

Si: more than 0.10% to 0.50% or less,

Mn: 0.05 to 0.50%,

P: 0.015% or less,

S: 0.0015% or less,

Cr: 0.005 to 0.50%,

Ni: 34.5 to 37.0%,

Cu: 0.005 to 1.0%,

Co: 0.005 to 0.50%,

Mo: 0.001 to 0.50%,

Al: 0.0001 to 0.050%,

Nb: 0.001 to 1.0%,

N: 0.010% or less,

O: 0.0060% or less,

Ti: 0.0200% or less,

Zr: 0.0200% or less,

Hf: 0.0200% or less,

V: 0.500% or less,

W: 1.000% or less,

Sn: 0.050% or less,

Zn: 0.0020% or less,

Pb: 0.0010% or less,

Ta: 0 to 1.0%,

B: 0 to 0.010%,

Ca: 0 to 0.0050%,

Mg: 0 to 0.0030%,

REM: 0 to 0.050%, and

the balance: Fe and unavoidable impurities,

and satisfying Formula (1), Formula (2), Formula (3) and Formula (4) below,

wherein:

a yield stress is 240 MPa or more, and

a plate thickness is 3.0 mm or more;

T₀≤T₁-2 (1)

C—Nb/7.7-Ta/15≤0.045 (2)

Nb-7.7C≤0.30 (3)

Ta-15C≤0.30 (4)

where, each symbol of an element in the above formulas represents a content, in mass %, of a corresponding element, T₀represents a Curie temperature, in ° C., of the alloy material, and T₁represents a Curie temperature, in ° C., of the alloy material after the alloy material is held at 900° C. for one minute and thereafter is cooled under conditions such that an average cooling rate in a temperature range from 600 to 300° C. is 0.2° C./s.