Abstract: 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.

Key words:  , Super Duplex Stainless Steel S32750, Solution Temperature, Structure, Mechanical Properties, Corrosion Resistance

摘要： 研究了950～1 200℃60 min水冷的固溶处理对超级双相不锈钢S32750(/%:0.02C、0.49Si、1.03Mn、0.026S、0.001P、25.01 Cr、7.03Ni、3.80Mo、0.29N)12 mm板的组织、力学性能和耐蚀性的影响。结果表明,随固溶温度升高,钢中铁素体相增加,奥氏体相减少;在950℃加热时铁素体中析出大量σ-相,使钢的性能恶化,在1 050～1 100℃固溶处理后,钢中铁素体相和奥氏体相各占50%, S32750钢具有较好的综合力学性能和优良的耐蚀性能。

关键词: 超级双相不锈钢S32750, 固溶温度, 组织, 力学性能, 耐蚀性