Hastelloy
A family of nickel-based alloys with exceptional corrosion resistance. Most common valve grade: Hastelloy C-276 (UNS N10276) - resists concentrated sulfuric acid, hydrochloric acid, chlorine, and oxidising acids. Used where 316 SS fails. Other grades: C-22, B-3 (hydrochloric acid), G-30 (phosphoric acid).
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Frequently Asked Questions
What is Hastelloy used for in industrial valves?
A family of nickel-based alloys with exceptional corrosion resistance. Most common valve grade: Hastelloy C-276 (UNS N10276) - resists concentrated sulfuric acid, hydrochloric acid, chlorine, and oxidising acids. Used where 316 SS fails. Other grades: C-22, B-3 (hydrochloric acid), G-30 (phosphoric acid).
When should I specify Hastelloy for valve body or trim?
Hastelloy 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 Hastelloy with full mill certificates.
Is Hastelloy 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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