Stellite 21 is a cobalt-based alloy known for its outstanding corrosion resistance, thermal stability, and resistance to thermal fatigue. It is widely used in valve stems, steam valves, medical components, and high-temperature sealing applications where toughness and corrosion resistance are more important than maximum hardness.
Cobalt-Based Alloy
Stellite 21
Stellite 21 is a cobalt-based alloy known for its outstanding corrosion resistance, thermal stability, and resistance to thermal fatigue. It is widely used in valve stems, steam valves, medical components,...
Stellite 21
Description
Chemical Composition
| Element | Content (%) |
|---|---|
| Co | Base |
| Cr | 26-29 |
| Mo | 4.5-6.0 |
| C | <0.35 |
| Ni | <3.0 |
| Others | Fe, Si, Mn |
| Hardness | 27-40 HRC |
| Density | 8.33 g/cm3 |
Equivalent Grades
| Specification / Standard | Product Form / Grade |
|---|---|
| UNS R30021 | Rod, Castings |
| UNS W73041 | Wire |
| UNS W73021 | Electrode |
Execution Standards
| Specification / Standard | Product Form |
|---|---|
| AMS 5385 | Castings |
| AMS 5819 | Rod, Wire |
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