固溶温度对奥氏体不锈钢022Cr24Ni17Mo5Mn6NbN组织和性能的影响

Effect of Solution Temperature on Microstructure and Properties of Super Austenitic Stainless Steel 022Cr24Ni17Mo5Mn6NbN

实验用022Cr24Ni17Mo5Mn6NbN超级奥氏体不锈钢(/%:0.028C,0.33Si,6.21Mn,24.93Cr,17.03Ni,4.24Mo,0.45N)采用1 t非真空感应+电渣重熔的工艺冶炼,Φ360 mm电渣锭经锻造开坯后轧制为Φ40 mm棒材。研究了热轧态(终轧1000℃,水冷)和经1070~1180℃固溶后钢的组织、点腐蚀性能和力学性能。实验结果表明,随固溶温度的升高,该钢晶粒逐渐长大,强度降低,塑性增加,耐点腐蚀性能得到改善。采用1120℃进行固溶,该钢可以获得均匀的组织、优异的点腐蚀性能和良好的综合力学性能。

The tested super austenitic stainless steel 022Cr24Ni17Mo5Mn6NbN(/%:0.028C,0.33Si,6.21Mn,24.93Cr,17.03Ni,4.24Mo,0.45N)is melted by 1 t non vacuum induction furnace and electroslag remelting process,and rolled intoΦ40 mm bar afterΦ360 mm electroslage ingot forging.The microstructure,pitting corrosion resistance and mechanical properties of the steel as hot-rolled(end rolling at 1000℃,WC)and after solution at 1070~1180℃are studied.The tested results show that with the increases of solution temperature,the grain size of steel gradually grows,the strength of steel decrease and the plasticity increases,and the pitting corrosion resistance improves.Uniform structure,better pitting corrosion resistance and good mechanical properties of steel are obtained by solid solution at 1120℃.