超级奥氏体不锈钢254SMo的均质化工艺研究

试验用超级奥氏体不锈钢254SMo(/%:0.011C,0.30Si, 0.46Mn, 20.25Cr, 17.75Ni, 6.13Mo, 0.64Cu, 0.212N)采用20 t电弧炉+AOD+LF精炼的工艺冶炼，研究了254SMo钢的铸态组织，发现枝晶间存在大量的析出相，其临近冒口钢锭头部中心的析出相尺寸最大，且呈网状分布。钢锭经1240℃8～40 h均质化处理后，锻造成Φ204 mm棒材，检验其析出相数量和点腐蚀速率。试验结果表明：随着均质化时间的延长，其析出相尺寸减小，数量减少，钢的点腐蚀性能提高；均质化12 h+镦粗拔长+均质化12 h为最优均质化工艺。

Study on Homogenization Process of Super Austenitic Stainless Steel 254SMo

The tested super austenitic stainless steel 254SMo(/%:0.011C,0.30Si,0.46Mn,20.25Cr,17.75Ni,6.13Mo,0.64Cu,0.212N) is melted by 20 t electric arc furnace + AOD +LF refining,the as-cast microstructure of 254SMo steel has been studied. It is found that there are a large number of precipitates between dendrites,and the precipitates in the center of ingot head near hot top are the largest and distributed in a network. After homogenization treatment at 1240℃ for 8-40 h,the ingots are forged to φ204 mm bar,the quantity of precipitated phase and pitting corrosion rate are inspected. The experimental results show that with the prolongation of homogenization time,the size and quantity of precipitates decrease,and the pitting corrosion performanceof steel improves; Homogenization for 12 h + Upsetting and Stretching + homogenization for 12 h is the optimal homogenization process.