Stellite® 21 Strip Supplier in India
Stellite® 21 strip (UNS R30021) is narrow cobalt-chromium-molybdenum flat stock, slit to width for valve-seat cladding and high-temperature edge overlay. Its tough, molybdenum-bearing matrix resists thermal and mechanical shock and reducing environments, so a strip band gives a durable running surface on valve and seat components that see hot, corrosive and cyclic duty. It work-hardens in service from about 27–40 HRC.
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-seat and gate cladding for high-temperature service.
- Edge overlay where thermal shock and reducing conditions are severe.
- Narrow high-temperature wear bands slit from CoCrMo stock.
- No tungsten; tough matrix; work-hardens from 27–40 HRC.
Supplied ex-stock from Mumbai with EN 10204 3.1 mill test certificates and export packaging. Contact us for widths, thicknesses and pricing, or see all Stellite 21 forms.