In-Flux 410NiMoT1 description: A low carbon martensitic stainless steel that can be used for joining Type CA-6NM stainless steel castings as well as for joining Types 409, 410, 410S and 405 stainless steels. Provides better crack resistance than a 410 weld metal. Preheat of 300 degrees F is generally sufficient for crack free welds.