Solid TIG wire for welding of alloy 59.
Applications
The weld deposit composition of 59%Ni-23%Cr-16%Mo is designed to match the nickel base corrosion-resistant alloy commonly known as alloy 59. The high level of Mo is similar to alloys C276 and C4 but performance in a wide range of more oxidising media is significantly enhanced by increasing Cr to 23% in alloy 59. Total alloying exceeds the level typically present in alloy C22; it is therefore considered suitable for welding this group of alloys. Alloy 59 consumables also provide strong, tough Nb-free weld metal for dissimilar welds in super austenitic and super duplex stainless steels or combinations of these with nickel base alloys. Some authorities do not allow or have discontinued the use of 625 type consumables for such applications, where deleterious Nb-rich precipitates may form in diluted or partially mixed regions around the fusion boundary. Alloy C276 is possibly a more economical alternative depending on the required properties in this situation. Applications of alloy 59 in aggressively corrosive media include scrubbers for flue gas desulphurisation (FGD), digesters and papermaking equipment, chemical process plants, corrosion-resistant overlays and in severe offshore and petrochemical environments.
Specification
AWS A5.14: ERNICrMo-13
BS EN ISO 18274: SNi6059
DIN 1736: SG-NiCr23Mo16 (2.4607)