Hastelloy C-276 / C-2000

UNS N10276 / N06200

C-276 is a nickel–molybdenum–chromium alloy with very low carbon and silicon, which is what keeps carbide precipitation out of the weld heat-affected zone and makes it usable in the as-welded condition. It resists oxidising and reducing media in the same vessel, which is why it appears in flue-gas desulphurisation, pickling lines and chemical reactors handling mixed waste streams.

C-2000 adds copper to the same family, improving resistance to sulphuric acid and to chloride pitting while keeping the broad multi-acid capability. Where the stream is mainly sulphuric acid with oxidising species, C-2000 is usually the better economy.

Properties

• Excellent resistance to pitting, crevice corrosion and chloride stress-corrosion cracking
• Handles oxidising and reducing media in the same environment
• Low carbon and silicon: no detrimental weld-zone precipitation, suitable for as-welded service
• Good high-temperature strength and oxidation resistance for a corrosion alloy

Applications

• Flue-gas desulphurisation scrubbers, dampers and ducting
• Heat exchangers, reactors and evaporators in chemical plants
• Pickling lines and acid recovery
• Wet chlorine, hypochlorite and chlorine dioxide service
• Sour gas and offshore process piping

Forms supplied

• Flanges to ASME B16.5 / B16.47 and HG/T 20592
• Butt-weld and forged fittings
• Forged rings, bar and shaped forgings
• Pipe and tube on request

Standards

ASTM B564 (forgings), ASTM B575 (plate), ASTM B622 (seamless pipe), ASTM B574 (bar), NACE MR0175 / ISO 15156 for sour service