Valve Material Reference
Stellite 6 (Cobalt-Chromium-Tungsten, UNS R30006) Valve
Stellite 6 Hard-Face TrimStellite 6 is a cobalt-chromium-tungsten alloy (Co-28Cr-4W-1C, UNS R30006) applied as a hard-facing weld overlay on valve seats, discs, and plug faces rather than as a bulk body material.
Form
Both
Max Temp
+800°C (+1470°F) as deposited hard-face layer
Min Temp
−196°C (−320°F) — no embrittlement
Category
Non Ferrous
Chemical Composition — Stellite 6 (Cobalt-Chromium-Tungsten, UNS R30006)
Temperature Range
Applicable in service from −196°C to +800°C (−320°F to +1470°F) as a surface layer
Maximum Temperature
+800°C (+1470°F) as deposited hard-face layer
Minimum Temperature
−196°C (−320°F) — no embrittlement
Equivalent Grades — Stellite 6 (Cobalt-Chromium-Tungsten, UNS R30006)
| Standard | Equivalent Grade |
|---|---|
| Stellite (Kennametal) | Stellite 6 / Alloy 6 |
| Deloro / equivalent | Tribaloy T-400, Colmonoy 6 (similar intent) |
| ISO | ISO 14920 cobalt-base hard-face alloys |
| DIN | DIN 32529 cobalt hard-surfacing |
Suitable Services
High-temperature steam valves above 260°C in power plant service
API 600 gate valves in refinery and petrochemical service per API 600 trim #8, #10, #12
Geothermal and nuclear power plant isolation valves
Metal-seated ball valves in dirty, particulate-laden gas service
Control valve trim in flashing, cavitating, or erosive service
Abrasive slurry lines (mineral processing, cement, coal handling)
Not Suitable For
Bulk valve body construction — Stellite is only a surface-applied trim/seat material
Hydrofluoric acid — cobalt alloys are attacked; use Monel or PTFE
Fuming nitric acid at high temperature
Valve Body Applications
Not used as a body material — applied as a hard-face overlay only
Trim Applications
Seat rings (welded-in or pressed-in) hard-faced with Stellite 6 in API 600 gate valves
Disc hard-face overlay in high-temperature globe and gate valves
Plug hard-face in eccentric plug valves in erosive slurry service
Ball sealing surfaces in metal-seated ball valves for high-temperature service
Control valve cage and plug faces in erosive / flashing service
Typical Valve Types in Stellite 6 (Cobalt-Chromium-Tungsten, UNS R30006)
Gate valves: API 600, Class 300–2500, Stellite-faced seats and wedge
Globe valves: Class 600–1500, Stellite-faced seat rings and discs
Ball valves: metal-seated, Stellite 6-clad seat rings, high-temperature / dirty service
Control valves: Stellite-tipped plugs and cage for anti-erosion / anti-cavitation
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Need Stellite 6 (Cobalt-Chromium-Tungsten, UNS R30006) Valves?
We supply Stellite 6 (Cobalt-Chromium-Tungsten, UNS R30006) (Stellite 6 Hard-Face Trim) gate valves, globe valves, ball valves, check valves, and more. Full certification documentation — EN 10204 3.1/3.2 MTCs, hydro test certs — as standard.