Hastelloy C276 Fasteners

Hastelloy C276 Fasteners — Material Overview & Form Factors

Hastelloy C276 is a high-performance alloy used wherever standard fasteners cannot meet the corrosion, temperature, or strength envelope. TorqBolt manufactures the full Hastelloy C276 fastener range — bolts, nuts, screws, washers, studs, and custom forgings — under one ISO 9001:2015 quality system, with PED 2014/68/EU module-H qualification for pressure-equipment service.

Where Hastelloy C276 Excels

Hastelloy C276 is specified in oil & gas wellhead components, refinery heat exchangers, petrochemical reactors, power-generation turbines, marine offshore platforms, and pharmaceutical / food-grade processing. Its corrosion resistance, high-temperature strength, and weldability make it the default for service conditions outside the carbon and standard-stainless envelope.

Form Factors Available

Standards & Certification

Hastelloy C276 fasteners are supplied with EN 10204 3.1 (mill cert) or 3.2 (third-party witnessed) material test reports as standard. Additional certification packages: NACE MR0175 / ISO 15156, NORSOK M-650, API 6A (wellhead), API 20E (subsea bolting), PED 2014/68/EU. Third-party inspection by TUV, Lloyd's, BV, DNV, SGS, and Intertek arrangeable on order.

Hastelloy — Ni-Cr-Mo / Ni-Mo Corrosion Alloys

Hastelloy is the trade designation for nickel-chromium-molybdenum (and nickel-molybdenum) alloys formulated for severe wet-corrosion service: hydrochloric, sulfuric, chloride pitting, crevice corrosion, and sour wells.

Hastelloy C-276 (UNS N10276) is the workhorse: 16% Cr, 16% Mo, 4% W — the only nickel alloy resistant to wet chlorine + hypochlorite. C-22 upgrades Cr for oxidizing-acid performance. C-2000 adds Cu for full-pH service. B-3 is Ni-Mo for hot HCl. G-35 targets phosphoric-acid plants.

Hastelloy fasteners ship per ASTM B574 / B575 with EN 10204 3.1 / 3.2 certification including PMI and intergranular-corrosion testing per ASTM G28. NACE MR0175 / ISO 15156 sour-service compliance standard.

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