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 |
