Hastelloy C-276 (UNS N10276/W.Nr.2.4819 DIN/EN 2.4606、NS334) is a nickel-molybdenum-chromium alloy renowned for its exceptional corrosion resistance in aggressive chemical environments. As industrial processes become more demanding, selecting the right piping material is critical for system reliability and longevity.
This comprehensive guide covers which media Hastelloy C-276 is suitable for, helping engineers and procurement professionals make informed material selection decisions.
Hastelloy C-276 Chemical Composition
| Element | Percentage |
|---|---|
| Nickel (Ni) | 57% min |
| Molybdenum (Mo) | 15-17% |
| Chromium (Cr) | 14.5-16.5% |
| Iron (Fe) | 4-7% |
| Tungsten (W) | 3-4.5% |
| Carbon (C) | 0.01% max |
The high molybdenum and chromium content provides outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking.
Compatible Media for Hastelloy C-276 Piping
Strong Acid Applications
Hydrochloric Acid (HCl)Hastelloy C-276 demonstrates excellent corrosion resistance across all concentrations and temperatures of hydrochloric acid. This makes it superior to stainless steel grades like 316L and 904L in HCl service.
Sulfuric Acid (H₂SO)The alloy performs exceptionally well in low to medium concentration sulfuric acid environments, offering reliable service in chemical processing applications.
Phosphoric Acid (H₃PO₄)Various concentrations of phosphoric acid are well-tolerated by C-276 piping systems.
Oxidizing Media
- Chloride solutions – Resistant to pitting and crevice corrosion
- Hypochlorite – Suitable for bleaching environments
- Wet chlorine gas – Excellent corrosion resistance
- Chlorine dioxide – Ideal for pulp and paper bleaching systems
High-Temperature Applications
- Flue gas desulfurization (FGD) systems
- Sour gas processing in oil & gas industry
- High-temperature acidic gases in chemical plants
Mixed Acid Environments
Hastelloy C-276 excels in complex mixed acid applications including aqua regia and HCl + H₂SO₄ combinations commonly found in chemical manufacturing.
Industry Applications
Chemical Processing
Reactors, heat exchangers, and piping systems handling aggressive chemicals benefit from C-276’s superior corrosion resistance.
Oil & Gas
Sour gas processing and acidic well environments require materials that resist hydrogen sulfide and carbon dioxide corrosion.
Flue Gas Desulfurization
Power plant FGD systems expose piping to sulfuric acid and chloride ions – conditions where C-276 excels.
Pharmaceutical
High-purity applications demand materials that resist contamination while maintaining structural integrity.
Pulp & Paper
Bleaching systems using chlorine dioxide and hypochlorite require corrosion-resistant piping solutions.
Waste Treatment
Hazardous waste incineration facilities benefit from C-276’s ability to withstand mixed corrosive gases.
Material Comparison: C-276 vs Alternatives
| Material | HCl Resistance | H₂SO₄ Resistance | Pitting Resistance | Relative Cost |
|---|---|---|---|---|
| SS 316L | Poor | Fair | Fair | Low |
| SS 904L | Fair | Good | Good | Medium |
| C-276 | Excellent | Excellent | Excellent | High |
| Titanium | Poor | Fair | Excellent | High |
| Duplex 2205 | Fair | Good | Good | Medium |
When to Choose Hastelloy C-276
Select C-276 for:
- Hydrochloric acid concentration > 10%
- Chloride ions combined with acidic environments
- High-temperature corrosive media
- Applications requiring stress corrosion cracking resistance
- Mixed acid service
Consider alternatives when:
- Low concentration acids: 316L or 904L may suffice
- Pure oxidizing media: Titanium could be more cost-effective
- Budget constraints: Duplex 2205 offers good performance at lower cost
Hastelloy C-276 Piping Products Available
At Hu Lin Pipe, we supply complete Hastelloy C-276 piping solutions:
- Seamless pipes (ASTM B622)
- Welded pipes (ASTM B619)
- Pipe fittings – elbows, tees, reducers, caps (ASTM B366)
- Flanges – weld neck, slip-on, blind (ASTM B564)
- Valves – ball, gate, check valves
All products manufactured per ASME, DIN, and JIS standards with full material traceability and Mill Test Certificates.
