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   API B1-B2 Cobalt Alloy
Cobalt Alloy Grade Specifications

Material: Alloy #2
Hardness: 53 - 63 RC
Density: .316 LBS / CU. IN.
Chemical Composition:
WC - 16.0 TO 19.0%   Cr - 31.0 TO 34.0%
C - 2.2 TO 2.7%   Mn - 1.0% MAX
Fe - 3.0% MAX   Si - 1.0% MAX
Ni - 2.5% MAX   Co - BALANCE
Remarks:  
GOOD WEAR, GOOD CORROSION RESISTANCE
Material: ALLOY #3
Hardness: 50 - 57 RC
Density: .314 LBS / CU. IN.
Chemical Composition:
WC - 11.0 TO 14.0%   Cr - 29.0 TO 33.0%
C - 2.0 TO 2.6%   Mn - 1.0% MAX
Fe - 3.0% MAX   Si - 1.0% MAX
Ni - 3.0% MAX   Co - BALANCE
Remarks:  
GOOD WEAR, GOOD CORROSION RESISTANCE