固溶处理对超级双相不锈钢S32750组织和性能的影响

Effect of Solid Solution Treatment on Structure and Properties of Super Duplex Stainless Steel S32750

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。

The effect of solid solution treatment at 950 - 1 200℃ for 60 min water cooling on structure, mechanical properties and corrosion resistance of 12 mm plate of super duplex stainless steel $32750 （/% ： 0. 02C, 0. 49Si, 1.03Mn, 0. 026S, 0. 001 P, 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℃ a large number of or-phase precipitates in ferrite led to the deterioration of performance ; as solid solution treated at 1 050 - 1 100℃ the volume of ferrite phase and austenite phase in steel respectively accounts for 50%, and the steel $32750 has better comprehensive mechanical nronerties and corrosion resistance.