US 12,084,732 B2
Hypereutectic white iron alloy comprising chromium, boron and nitrogen and cryogenically hardened articles made therefrom
Roman Radon, Belleview, FL (US); and Jerzy Ferdynandt Piotrowski, Summerfield, FL (US)
Filed by Townley Foundry & Machine Co., Inc., Belleview, FL (US)
Filed on Mar. 29, 2022, as Appl. No. 17/656,946.
Prior Publication US 2023/0313331 A1, Oct. 5, 2023
Int. Cl. C21D 5/04 (2006.01); C22C 37/08 (2006.01); C22C 37/10 (2006.01)
CPC C21D 5/04 (2013.01) [C22C 37/08 (2013.01); C22C 37/10 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A hypereutectic white iron alloy, wherein the alloy consists of, in weight percent based on a total weight of the alloy:
 
 
 C from 1.5 to 2.85
 
 B from 0.6 to 1.4
 
 N from 0.01 to 1.2
 
 Cr from 5 to 34
 
 Ni from 0.2 to 7.5
 
 Si from 0.1 to 4
 
 Mn from 0 to 8
 
 Co from 0 to 5
 
 Cu from 0 to 5
 
 Mo from 0 to 5
 
 W from 0 to 6
 
 V from 0 to 12
 
 Nb from 0 to 6
 
 Ti from 0 to 5
 
 Zr from 0 to 2
 
 (Mg + Ca) from 0 to 0.2
 
 one or more rare earth elements from 0 to 3
 
 one or more of Ta, Hf, Al from 0 to 3,
 
 remainder Fe and incidental impurities,
 
and wherein a Brinell hardness (HB) of an article sand-cast from the alloy is at least 600.