固溶温度对超级双相不锈钢S32750板材组织和耐蚀性的影响

Influence of Solution Temperature on Structure and Corrosion Resistance of Plate of Super Duplex Stainless Steel S32750

研究了920～1 100℃固溶处理温度对S32750钢中板(%:0.022C、25.35Cr、7.17 Ni、4.05Mo、0.28N)组织和6%FeCl_3+0.05NHCl溶液耐蚀性的影响。结果表明,≤1000℃固溶处理时,钢中析出脆性σ-相,铁素体含量≤11%,钢的硬度增加,钢的塑性、韧性和耐蚀性急剧下降,于1050～1100℃固溶处理,钢中组织为46%～47%铁素体+奥氏体组织,具有良好的综合力学性能和高的耐蚀性。

Influence of solution-treated temperature at 920 - 1 100℃ on structure and corrosion resistance of medium plate of steel S32750 （% ：0. 022C, 25. 35Cr, 7. 17Ni, 4. 05Mo,0. 28N） in 6% FeCl3 ＋0. 05NHCl liquor has been studied. The results showed that with solution-treated at ≤ 1 000℃, the σ-phase precipitated in steel, the ferrite content in structure was ≤11%, the hardness of steel increased and the plasticity, toughness and corrosion resistance of steel rapidly decreased; and with solution-treated at 1 050 - 1 100℃, the structure of steel was 46% - 47% ferrite ＋ austenite, it had excellent comprehensive mechanical properties and corrosion resistance.