Techalloy 410 NiMo description: Techalloy 410NiMo is used primarily to weld cast and wrought material of similar chemical composition. Preheating and inter-pass temperatures of not less than 300°F are required. Post-weld heat treatment should not exceed 1150°F , as higher temperatures may result in hardening. Extra low carbon provides better protection against cracks and increased ductility over 410 filler metal.