US 12,146,211 B2
Cryogenic pressure vessels formed from low-carbon, high-strength 9% nickel steels
George Jay Fraley, Chicago, IL (US); and Frederick Fletcher, Wayne, PA (US)
Assigned to ArcelorMittal, Luxembourg (LU)
Appl. No. 17/312,645
Filed by ArcelorMittal, Luxembourg (LU)
PCT Filed Nov. 21, 2019, PCT No. PCT/IB2019/060019
§ 371(c)(1), (2) Date Jun. 10, 2021,
PCT Pub. No. WO2020/128681, PCT Pub. Date Jun. 25, 2020.
Claims priority of application No. PCT/IB2018/060323 (WO), filed on Dec. 19, 2018.
Prior Publication US 2022/0064767 A1, Mar. 3, 2022
Int. Cl. C22C 38/48 (2006.01); C21D 1/18 (2006.01); C21D 6/00 (2006.01); C21D 9/46 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01)
CPC C22C 38/48 (2013.01) [C21D 1/185 (2013.01); C21D 6/004 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 9/46 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C21D 2211/001 (2013.01); C21D 2211/004 (2013.01); C21D 2211/008 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A cryogenic pressure vessel formed from a cryogenic steel alloy, the alloy comprising in wt. %:
C: 0.01-0.06; Mn: up to 2.0; P: up to 0.02; S: up to 0.15; Si: up to 1.0; Ni: 7-11; Cr: up to 1.0; Mo: up to 0.75; V: up to 0.2; Nb: up to 0.1; Al: up to 0.1; and N: up to 0.01;
the alloy having an ultimate tensile strength of at least 900 MPa, a total elongation of at least 20%; a microstructure of between 5 and 20 area % reverted austenite and a remainder of tempered martensite; a transverse Charpy impact energy of at least 27 J at −196° C.; and a lateral expansion of at least 0.381 mm at −196° C.