When should Hastelloy C-276 be specified vs super-duplex stainless?

C-276 is required when: (1) the environment contains reducing acids (HCl, H₂SO₄ at concentrations and temperatures that depassivate stainless); (2) oxidizing chloride solutions at temperatures above 60°C where 316L and duplex 2205 pit within hours; (3) wet chlorine gas, chlorine dioxide, or hypochlorite solutions; (4) mixed acid systems (e.g., HNO₃ + HF mixtures in pickling baths) where stainless dissolves and titanium explodes. The cost ratio is approximately 8-12× duplex 2205 and 4-6× super-austenitic 6% Mo grades (254 SMO/AL-6XN), so C-276 is specified only when lower-cost alternatives are definitively inadequate. Always perform in-situ corrosion coupon testing before committing to C-276 — lab immersion tests in simulated solutions can underestimate real process corrosion rates by 5-10×.

Hastelloy C-276 (UNS N10276): Universal Corrosion-Resistant Nickel Alloy für Chemical Processing

ASTM B575 / ASTM B622 / ASME SB-575 · Published: 2026-05-31 · Updated: July 2026

Quick Reference

Hastelloy C-276 is a nickel-molybdenum-chromium-tungsten wrought alloy with exceptional resistance to both oxidizing AND reducing environments — the combination that makes it a 'universal' corrosion solution where most metals fail in one regime...

Hastelloy C-276 ist ein nickel-molybdenum-chromium-tungsten wrought alloy mit exceptional widerstand zu beide oxidizing UND reducing environments — der combination das makes es ein 'universal' corrosion solution wo meiste metals fail in one regime oder der andere. Der hoch molybdenum (15-17%) und tungsten (3.0-4.5%) content provides pitting widerstand (PREN ~65 — approximately twice 316L) und widerstand zu reducing acids (HCl, H2SO4), while chromium (14.5-16.5%) provides widerstand zu oxidizing media. C-276 war specifically engineered zu overcome der weld-decay und heat-affected-zone corrosion problems von C-276's predecessor (Hastelloy C) durch niedrig carbon (<0.01%) and controlled silicon/manganese to suppress continuous grain-boundary carbide precipitation.

Quick Facts

Kategorie	Nickel Alloy
Norm	`ASTM B575 / ASTM B622 / ASME SB-575`
Density	8.89 g/cm³
Yield Strength	355 MPa (52 ksi) minimum (annealed)
Tensile Strength	790 MPa (115 ksi) minimum (annealed)

Global Equivalents & Cross-Reference

Alternative Norm / Güte	Action
EN NiMo16Cr15W	Compare
DIN 2.4819	Compare
Nicrofer 5716	Compare
Inconel C-276	Compare

Verwandt Materials

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Frequently Asked Questions

Wenn sollte Hastelloy C-276 sein specified vs super-duplex stainless?

C-276 ist erforderlich wenn: (1) der environment contains reducing acids (HCl, H₂SO₄ bei concentrations und temperatures das depassivate stainless); (2) oxidizing chloride solutions bei temperatures über 60°C wo 316L und duplex 2205 pit innerhalb hours; (3) wet chlorine gas, chlorine dioxide, oder hypochlorite solutions; (4) mixed acid systems (e.g., HNO₃ + HF mixtures in pickling baths) wo stainless dissolves und titanium explodes. Der kosten ratio ist approximately 8-12× duplex 2205 und 4-6× super-austenitic 6% Mo grades (254 SMO/AL-6XN), so C-276 ist specified nur wenn unter-kosten alternatives sind definitively inadequate. Immer durchführen in-situ corrosion coupon testing vor committing zu C-276 — lab immersion tests in simulated solutions können underestimate real process corrosion rates durch 5-10×.

References & International Standards

ASTM International. Norm Specifications für Stahl & Metal Alloys. astm.org
International Organization für Standardization (ISO). Metallic Materials — Cross-Referenz Database. iso.org
American Iron und Stahl Institute (AISI). Stahl Güte Designations & Equivalents. steel.org
European Committee für Standardization (CEN). EN Stahl Standards & Numbering System. cencenelec.eu