... A Nickel-Iron-Cobalt, controlled expansion alloy containing 29% Nickel. It's ... K500, Nimonic 80A, Alloy G3, Alloy A286, AL6XN, Invar, Kovar, alloy.Available forms are seamless pipe, welded pipe, seamless tube, welded tube, bar, ... wire, sheet, plate, forgings, pipe fittings and flanges,strip. Kovar welded pipe