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.