US 12,000,023 B2
Methods of making corrosion resistant nickel-based alloys
Nacéra Sabrina Meck, Cheswick, PA (US); David S. Bergstrom, Sarver, PA (US); John J. Dunn, Freeport, PA (US); and David C. Berry, Washington, PA (US)
Assigned to ATI Properties LLC, Pittsburgh, PA (US)
Filed by ATI Properties LLC, Pittsburgh, PA (US)
Filed on Nov. 19, 2021, as Appl. No. 17/531,425.
Application 17/531,425 is a division of application No. 17/195,511, filed on Mar. 8, 2021, granted, now 11,186,898.
Claims priority of provisional application 62/987,154, filed on Mar. 9, 2020.
Prior Publication US 2022/0074025 A1, Mar. 10, 2022
Int. Cl. C22F 1/10 (2006.01); C22C 19/05 (2006.01)
CPC C22C 19/055 (2013.01) [C22F 1/10 (2013.01)] 37 Claims
 
1. A method of making a nickel-based alloy comprising from 38 to less than 48.0 weight percent Ni, from 19 to 25 weight percent Cr, from 15 to 35 weight percent Fe, from 0.1 to 10 weight percent Co, and from 3 to 7 weight percent Mo, the method comprising:
homogenizing an ingot of the nickel-based alloy;
working the homogenized ingot to form a slab or billet;
further hot rolling to form a plate or bar or tubular product;
annealing the product; and
cooling the annealed product, wherein the nickel-based alloy possesses at least one of the following properties:
a Charpy impact energy of at least 100 ft-lbs, measured using 5-millimeter specimens at −50° C. per ASTM E23-18;
a critical pitting temperature of greater than 95° F., measured per ASTM G48 Method C;
an intergranular corrosion rate of less than 0.25 mm/yr, measured per ASTM G28 Method A; and
a resistance to stress corrosion cracking of greater than 1,000 hrs, measured per ASTM G36.