Welding characteristics of duplex stainless steel S32750
The welding performance of duplex stainless steel S32750 has the advantages of both austenitic and ferritic stainless steel. Compared with ferritic stainless steel and austenitic stainless steel, it is neither significantly reduced in plastic toughness due to severe grain coarsening in the welding heat affected zone of ferritic stainless steel, nor sensitive to welding hot cracks like austenitic stainless steel.
When welding this kind of steel, the crack tendency is very low and there is no need for preheating and post weld heat treatment. Because the base metal contains n, the single-phase ferrite zone will not be formed in the welding near the weld, and the austenite content is generally not less than 30%. The applicable welding methods include argon tungsten arc welding and electrode arc welding. Generally, in order to prevent grain coarsening near the weld, low linear energy welding shall be used as far as possible.
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