Stellite® 21 Round Bar Supplier in India
Stellite® 21 round bar (UNS R30021) is turned into valve trim, forging and hot-stamping dies, and high-temperature wear parts, and its long-established CoCrMo chemistry is also machined into implant and dental components. With molybdenum in place of tungsten, the tough cobalt matrix gives excellent thermal and mechanical shock resistance and cavitation and galling resistance; it work-hardens in service from about 27–40 HRC and holds up in oxidising conditions to about 1150 °C.
Equivalent Grades & Standards
| Property | Value |
|---|---|
| UNS number | R30021 |
| Density | 8.33 g/cm3 |
| Melting range | 1295-1435 °C |
Identifiers and physical constants for Stellite 21. A dash means no such designation is published for this grade.
Chemical Composition
| Element | Min (%) | Max (%) |
|---|---|---|
| Cobalt (Co) | — | Balance |
| Chromium (Cr) | 26 | 29 |
| Molybdenum (Mo) | 4.5 | 6.0 |
| Carbon (C) | — | 0.35 |
| Nickel (Ni) | — | 3.0 |
Composition limits for Stellite 21. These are specification limits for the grade, not measured values for a lot; the mill test certificate supplied with your order states the actual analysis.
Applications & Benefits
- Valve trim, stems and seats for petrochemical and power generation.
- Forging and hot-stamping dies subject to thermal and mechanical shock.
- Implant and dental component stock (CoCrMo chemistry).
- No tungsten; work-hardens from 27–40 HRC; oxidising service to about 1150 °C.
Supplied ex-stock from Mumbai with EN 10204 3.1 mill test certificates and export packaging. Contact us for diameters, quantities and pricing, or see all Stellite 21 forms.