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Cobalt #21

Class: ERCCoCr-E

AWS: A5.21

Conforms to Certification: AWS A5.21               ASME SFA A5.21

AWS Chemical Composition Requirements
C = 0.15 – 0.40 Mo = 4.5 – 7.0
Mn = 2.0 max Fe = 5.0 max
Si = 1.5 max W = 0.50 max
Cr = 25 – 30 Co = Remainder
Ni = 1.5 – 4.0 Other = 1.0 max

Available Sizes
.045 x 33 lb spool
1/16 x 33 lb Spool

Description
Cobalt Alloy #21 (ERCCoCr-E) flux-cored wire has excellent work hardenability, high temperature, strength, and impact resistance. Type 21 is a good choice for valve trim and steam and fluid control valve bodies and seals. It bonds well to all weldable steels, including stainless steel.

Deposited Chemical Composition % (Typical)
C = 0.3 Mo = 5.4
Mn = 0.7 Fe = 1.8
Si = 0.5 W = 0.10
Cr = 27.4 Co = Balance
Ni = 2.4