US 9,808,877 B2
Alloy, overlay, and methods thereof
George Y. Lai, Del Mar, CA (US); and Bingtao Li, Suwanee, GA (US)
Assigned to AZZ WSI LLC, Norcross, GA (US)
Filed by George Y. Lai, Del Mar, CA (US); and Bingtao Li, Suwanee, GA (US)
Filed on Jan. 19, 2010, as Appl. No. 12/689,637.
Claims priority of provisional application 61/264,612, filed on Nov. 25, 2009.
Prior Publication US 2011/0120977 A1, May 26, 2011
Int. Cl. C22C 38/40 (2006.01); C22C 38/44 (2006.01); C22C 38/54 (2006.01); C22C 38/58 (2006.01); B23K 9/04 (2006.01); B23K 10/02 (2006.01); C22C 38/02 (2006.01); B23K 26/32 (2014.01); B23K 26/34 (2014.01); B23K 35/30 (2006.01); C22C 38/18 (2006.01); B23K 101/06 (2006.01); B23K 101/12 (2006.01); B23K 101/34 (2006.01); B23K 103/04 (2006.01)
CPC B23K 9/04 (2013.01) [B23K 10/027 (2013.01); B23K 26/3206 (2013.01); B23K 26/345 (2013.01); B23K 35/308 (2013.01); B23K 35/3086 (2013.01); C22C 38/02 (2013.01); C22C 38/18 (2013.01); C22C 38/40 (2013.01); C22C 38/44 (2013.01); C22C 38/54 (2013.01); C22C 38/58 (2013.01); B23K 2201/06 (2013.01); B23K 2201/12 (2013.01); B23K 2201/34 (2013.01); B23K 2203/04 (2013.01)] 8 Claims
 
1. A hardfacing welding alloy that can be applied by welding to form an overlay over an upper surface of a steel substrate for protection against cracking, high-temperature corrosion and erosive wear, the hardfacing welding alloy comprising about 0.5 weight percent to about 2 weight percent carbon, about 15 weight percent to about 30 weight percent chromium, about 4 weight percent to about 12 weight percent nickel, about 0.5 to about 2.0 weight percent manganese, up to about 2.5 weight percent silicon, up to about 1 weight percent zirconium, up to about 3 weight percent molybdenum, up to about 3 weight percent tungsten, up to about 0.5 weight percent boron, and balance being iron along with about 0.5 weight percent impurities, and wherein the ratio of chromium to nickel is in a range of about 2 to about 3.