Use & Application
The weld deposit matches parent alloy C276 with Ni-15%Cr-16%Mo-4%W-5%Fe. C and Si are controlled to minimize carbide and intermetallic phase precipitates. Cast versions of the alloy typically have higher carbon and silicon, but repair welds are usually solution treated for optimum corrosion resistance. Alloy C276 has high resistance to corrosion in a wide range of acids and salts under oxidizing and reducing conditions. These include hydrochloric and hydrofluoric acids, hypochlorites, chlorides and wet chlorine gas, sulphuric, phosphoric and many organic acids. Exceptional resistance to crevice corrosion and pitting in seawater and chloride-induced stress corrosion cracking, superior to alloy 62. Excellent properties to below -196°C allow its use for welding 5-9%Ni cryogenic installations. Applications include **pumps, valves, pipework and vessels** for use in aggressive environments in chemical process plants; also in equipment for flue gas desulphurization and critical equipment in offshore oil and gas production." Preheat is not required, interpass temperature should preferably be kept below 100°C and heat input restricted to 1.5kJ/mm.
Alloy type
Alloy C276 is a Ni-15%Cr-16%Mo-4%W-5%Fe nickel base alloy.
In the as-welded condition the weld metal consists of austenite with some carbides.
Materials to be welded

EN W.Nr.: 2.4819 (NiMo16Cr15W), 2.4883 (G-NiMo16Cr).
ASTM: A494 CW-12MW, A743/A744 CW-12M.
UNS: N10276.
PROPRIETARY: Hastelloy® Alloy C-276 (Haynes International Inc), Inconel® Alloy C-276 (Special Metals), Nicrofer 5716hMoW (VDM).

Products of the line C276

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