Metrode Nimrod-C22KS description: The weld deposit composition of Ni-22Cr-13.5Mo-3W is designed to match the nickel base alloy commonly known as alloy C22. The high level of molybdenum is similar to alloys C276 and C4 but performance in a wide range of more oxidising media is significantly enhanced in alloy C22 by increasing chromium to 22%. Alloy C22 also provides a tough Nb-free weld metal for dissimilar welds in superaustenitic and superduplex stainless steels or combinations of these with nickel base alloys. Some authorities do not allow or have discontinued using alloy 625 consumables for such applications, where deleterious Nb-rich precipitates may form in diluted or partially mixed regions around the fusion boundary.