US 11,702,714 B2
High fracture toughness, high strength, precipitation hardenable stainless steel
Wesley T. Roth, Lititz, PA (US); Alberto O. Polar-Rosas, Reading, PA (US); Andrea Ricci, Senigallia (IT); and Stephane A. Forsik, Reading, PA (US)
Assigned to CRS HOLDINGS, LLC, Wilmington, DE (US)
Filed by CRS HOLDINGS, INC., Wilmingon, DE (US)
Filed on Feb. 26, 2021, as Appl. No. 17/186,813.
Claims priority of provisional application 62/981,779, filed on Feb. 26, 2020.
Prior Publication US 2021/0371945 A1, Dec. 2, 2021
Int. Cl. B33Y 70/00 (2020.01); B33Y 40/20 (2020.01); B22F 10/66 (2021.01); B22F 10/64 (2021.01); C22C 38/02 (2006.01); C22C 38/50 (2006.01); C21D 8/00 (2006.01); C21D 6/00 (2006.01); C22C 38/00 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/44 (2006.01); C22C 38/52 (2006.01); C22C 38/54 (2006.01)
CPC C21D 8/005 (2013.01) [B22F 10/64 (2021.01); B22F 10/66 (2021.01); B33Y 40/20 (2020.01); B33Y 70/00 (2014.12); C21D 6/004 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (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 38/50 (2013.01); C22C 38/52 (2013.01); C22C 38/54 (2013.01); C21D 2211/008 (2013.01)] 32 Claims
OG exemplary drawing
 
1. A martensitic, precipitation hardenable stainless steel alloy consisting essentially of, in weight percent:
 
 
 Ni about 10.5 to about 12.5
 
 Co about 1.0 to about 6.0
 
 Mo about 1.0 to about 4.0
 
 Ti about 1.5 to about 2.0
 
 Cr  about 8.5 to about 11.5
 
 Al up to 0.2
 
 Mn up to about 1.0 max.
 
 Si up to about 0.75 max.
 
 B up to about 0.01 max.
 
and the balance of the alloy is essentially iron and the usual impurities, including, not more than about 0.03% carbon, not more than about 0.03% nitrogen, not more than about 0.04% phosphorus, and not more than about 0.020% sulfur.