	US 12,137,501 B2
	Method for producing Fe—Cr alloy
Akito Mizutani, Tokyo (JP); Tatsuhiko Hiratani, Tokyo (JP); and Mitsuyuki Fujisawa, Tokyo (JP)
Assigned to JFE STEEL CORPORATION, Tokyo (JP)
Filed by JFE STEEL CORPORATION, Tokyo (JP)
Filed on Sep. 28, 2021, as Appl. No. 17/449,128.
Application 17/449,128 is a division of application No. 16/965,013, granted, now 11,497,085, previously published as PCT/JP2018/044789, filed on Dec. 5, 2018.
Claims priority of application No. 2018-014002 (JP), filed on Jan. 30, 2018.
Prior Publication US 2022/0015196 A1, Jan. 13, 2022
Int. Cl. C22C 38/00 (2006.01); C21D 8/02 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01); C22C 38/54 (2006.01); C23C 10/46 (2006.01); H05B 3/12 (2006.01)

CPC H05B 3/12 (2013.01) [C21D 8/0226 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/005 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C22C 38/54 (2013.01); C23C 10/46 (2013.01); H05B 2203/013 (2013.01)]

4 Claims

1. A method for producing a Fe—Cr alloy, comprising:

rolling a slab having a chemical composition containing, by mass %,

C: 0.020% or less,

Si: 0.01% to 1.5%,

Mn: 1.0% or less,

P: 0.040% or less,

S: 0.010% or less,

Cr: 20.5% to 30.0%,

Al: 5.5% to 6.5%,

N: 0.020% or less,

Ni: 0.50% or less, and

total content of C and N: 0.014% or more, with the balance being Fe and inevitable impurities, to obtain a sheet material having a final sheet thickness; and

subjecting the sheet material to siliconizing treatment by a thermal CVD method, to obtain a Fe—Cr alloy having a Si content of more than 1.5 mass % and 10.0 mass % or less and satisfying the following formula (1):

14.0≤% Si+1.15×% Al+0.35×% Cr (1)

where % Si, % Al, and % Cr in formula (1) indicate a Si content, an Al content, and a Cr content, by mass %, respectively, in the chemical composition of the Fe—Cr alloy.