Stellite® 21 Wire Supplier in India
Stellite® 21 wire (UNS R30021) is a cobalt-chromium-molybdenum hardfacing filler for weld overlay where thermal shock, cavitation and reducing environments matter more than peak hardness. Its lower-carbon, molybdenum-bearing deposit is tougher and more crack-resistant than the tungsten grades and work-hardens in service, which makes it the standard overlay for high-temperature valve trim in petrochemical and power plant. It is applied by TIG, MIG or oxy-acetylene welding.
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
- Weld overlay of high-temperature valve trim, seats and gates.
- Overlay where thermal and mechanical shock resistance is critical.
- Repair and rebuild of worn Stellite 21 and CoCrMo components.
- Tougher, more crack-resistant deposit than the tungsten grades; work-hardens in service.
Supplied ex-stock from Mumbai with EN 10204 3.1 mill test certificates and export packaging. Contact us for diameters, spool sizes and pricing, or see all Stellite 21 forms.