The effect of solid solution treatment at 950 〜1 200 T for 60 min water cooling on structure

mechanical properties and corrosion resistance of 12 mm plate of super duplex stainless steel S32750 (/%: 0. 02C

0. 49Si

1. 03Mn

0. 026S

0. 001P

25. 01Cr

7. 03Ni

3. 80Mo

0. 29N) has been studied. Results show that with raising solution temperature the ferrite phase in steel increases and the austenite phase decreases ； heating at 950 °C a large number of a-phase precipitates in ferrite led to the deterioration of performance ； as solid solution treated at 1 050 ~ 1 100 °C the volume of ferrite phase and austenite phase in steel respectively accounts for 50%

and the steel S32750 has better comprehensive mechanical properties and corrosion resistance.