Practical application of solid solution treatment after welding to super duplex stainless steel

Super duplex stainless steel is widely used in chemical,petrochemical processing, papermaking,offshore operations and other industries. The company manufactured equipment by adopting super duplex stainless steel（ SA240 S32750） materials,and this equipment hassome characteristic such as large size,heavy section,and high requirements on impact toughness and corrosion resistance of welding material and so on. Some parts need cold forming and deformation rate is high, so solid solution treatment is required to restore material properties.With the continuous progress of dual phase steel welding technology and heat treatment technology, based on the solid solution treatment process of raw materials in the practical work process,solid solution treatment after welding of dual phase steel was tested, and some experiences were accumulated. In order to prevent the influence of environment,the solution temperature was increased and a brief description was given.