Use & Application
The weld metal matches 6%Mo superaustenitic parent material, usually castings, and is used only when post weld solution annealing is applied. It has a very low C content thus with a very little risk of carbide precipitation during heating, for example when welding. It displays a PRE number greater than 40. Due to its stable austenitic structure, the base metal can be sensitive to hot cracking in connection with welding, and generally welding should be performed using a low heat input. Solidification after partial remelting, e.g. by welding, causes redistribution of elements such as Mo, Cr and Ni. These variations, segregation, remain in the cast structure of the weld and can impair the material’s corrosion resistance in certain environments. Developed especially for oil and gas offshore platforms and the pulp and paper industry. Other common applications are: equipment for handling of seawater, such as seawater cooling, cooling water pipes, ballast water systems, firefighting systems, equipment in pulp bleaching plants, tanks and pipelines for chemicals with high halide contents. Heat-input of <1.5 kJ/mm and interpass temperature of <100°C are recommended.
Alloy type
6% molybdenum and nitrogen-alloyed austenitic stainless steel.
Materials to be welded

EN W.Nr.: 1.4547 (X1CrNiMoCuN20-18-7).
UNS: S31254.
PROPRIETARY: 254 SMO (Outokumpu).

Products of the line 254 SMO

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