Stellite
A cobalt-chromium alloy (Stellite 6, Stellite 21) used as a hard-facing overlay on valve seats and trim. Provides excellent resistance to wear, erosion, galling, and high-temperature oxidation. Applied by welding overlay on metal-seated ball, gate, and globe valves.
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Frequently Asked Questions
What is Stellite used for in industrial valves?
A cobalt-chromium alloy (Stellite 6, Stellite 21) used as a hard-facing overlay on valve seats and trim. Provides excellent resistance to wear, erosion, galling, and high-temperature oxidation. Applied by welding overlay on metal-seated ball, gate, and globe valves.
When should I specify Stellite for valve body or trim?
Stellite is specified when the process fluid, temperature, or pressure requirements exceed what standard carbon steel (A216 WCB) or austenitic stainless steel (A351 CF8M) can handle. Material selection must consider corrosion rates, maximum and minimum design temperatures, and compliance with NACE MR0175 for sour service. Vajra Industrial Solutions can supply valves in Stellite with full mill certificates.
Is Stellite compatible with sour (H2S) service per NACE MR0175?
Material qualification for sour service (NACE MR0175 / ISO 15156) depends on the hardness limits, heat treatment condition, and UNS designation of the specific alloy. For H2S-containing service, the valve material order and PMI (positive material identification) must be verified against the applicable NACE material group. Contact Vajra Industrial Solutions for material recommendations specific to your H2S partial pressure and chloride conditions.
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