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实验钢(/%:0.24C,0.01Mn,0.06Si,0.001S,0.002P,13.42Co,11.32Ni,3.05Cr,1.18Mo,0.015A1,0.015Ti)为6 t真空感应炉+真空自耗熔炼的中600 mm锭经3次镦拔锻制的Φ300 mm钢棒,并经650℃20 h退火处理(晶粒度6.0级)。实验研究了Φ300 mm钢棒至中250 mm钢棒(变形30%)的锻制温度(900~1 200℃)和预备热处理(860℃和900℃正火)对钢的晶粒度的影响。结果表明,锻造温度1 000~1 140℃,变形量30%时可获得细小的完全再结晶晶粒(7.0级)。900℃正火处理该钢可获得均匀细小的晶粒(7.0级)。