Nickel base solid TIG wire for alloy C276.
Applications
The weld deposit composition matches parent alloy C276 with Ni-15% Cr-16% Mo-4% W-5% Fe. Carbon and silicon are controlled as close as possible to the very low levels of the wrought alloy to minimise carbide and intermetallic phase precipitates which can reduce as-welded corrosion resistance. Cast versions of the alloy typically have higher carbon and silicon (like the original wrought Hastelloy alloy C, now obsolete), 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 oxidising and especially 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 625). High-temperature stability is limited by intermetallic phase formation. In addition to fabrication welds in alloy C276, these consumables have good tolerance to dilution by most ferrous and high nickel alloys, and are suitable for surfacing and dissimilar welds which exploit corrosion resistance, strength and toughness. Excellent properties to below -1960C allows 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 desulphurisation and critical equipment in offshore oil and gas production.
Specifications
AWS A5.14: ERNiCrMo-4
BS EN ISO 18274: SNi6276
BS 2901: Pt2 NA48
DIN 1736: SG-NiMo16Cr16W (2.4886)
UNS: N10276