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Hardfacing Alloy >> Co 21
 

Description
Co 21, cobalt based bare rod that forms a low carbon, austenitic alloy, with excellent work hardening properties, high temperature strength and impact resistant. Co 21deposits are stable during thermal cycling, making them a good choice for hot die materials. it¡¯s used on steam and fluid control valve bodies and seats. It can be applied to all weldable steels, including stainless steels. It equivalent to: Stellite 21, Polystel 21.

Applications
Steam Valves. Hot Shears. Forging Dies. Piercing Plugs. Chemical and Petrochemical Valves.

Product Details
Chemical composition:

Grade Chemical composition(%)
Co Cr W Ni

C

Mn

Si Mo Fe
Co 21 Bal 27.3 ¡Ü0.5 2 0.25 ¡Ü0.5 1.5 5.5 1.5
Physical Properties
Grade Density Melting Point
Co 21 8.33g/cm3 1295~1435¡ãC

Typical Characteristics:

Hardness Abrasion Resistance Deposit Layers Corrosion Resistance Machilityineab
HRC 27~40 Good Multiple Good Carbide Tools

Standard Sizes:

Diameter Diameter Diameter
1/8¡± (3.2mm) 5/32¡± (4.0mm) 3/16¡± (4.8mm)
Note that special sizes, or packing requirements are available on all requests.
Specifications:

AWS A5.21 /ASME BPVC IIC SFA 5.21 ERCoCr-E
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