Stellite® 21 Sheet Supplier in India
Stellite® 21 sheet (UNS R30021) is a cobalt-chromium-molybdenum alloy - molybdenum, not tungsten - supplied flat for high-temperature valve-trim blanks, wear plates and biomedical stock. The lower carbide volume lets the tough cobalt matrix govern, giving excellent thermal and mechanical shock resistance, cavitation and galling resistance, and service in oxidising conditions to about 1150 °C. It work-hardens from about 27–40 HRC and resists reducing and sour environments better than the tungsten grades.
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 and seat blanks for petrochemical and power-generation service.
- High-temperature wear plates where thermal and mechanical shock are severe.
- Biomedical and dental blanks (a long-established CoCrMo implant 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 sizes, quantities and pricing, or see all Stellite 21 forms.