Executive Cobalt 21 is a cobalt based alloy designed for resistance to impact, thermal fatigue, and corrosion at temperatures up to 815°C (1,500°F). While Executive Cobalt 21 is not used for severe abrasion applications, the weld deposit exhibits superior resistance to heat checking, spalling, chipping, and erosion. Executive Cobalt 21 goes down relatively soft as welded but will work harden to above 45 RC. As it is less crack sensitive than other cobalt alloys, it is typically used for build-up and on large sections.