AWS RCoCr-C (Co 1) It has excellent wear and heat resistance at high temperature. Recommended use for making valve seal inserts , rotating sealing ring, drill heads, cutter edge ,etc AWS RCoCr-A (Co 6) The most widely used Cobalt Alloy with good mechanical properties at different temperatures, Recommended use for making valve seat material, hot shear blade, high temperature valve , turbine blade ,etc. AWS RCoCr-B (CO 12) It has excellent resistance on high heat, corrosion and abrasion. Recommended use for making high- pressure valve, shear edge, sawteeth, etc. AWS RCoCr-E (CO 21) It has excellent resistance on high heat, corrosion and abrasion. Recommended use for making fuild valve, brass casting die , vlave seat, etc.