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试验18CrNiMo7-6重型齿轮钢（/%：0.165C,0.59Mn,0.24Si,0.006S,0.008P,1.56Ni,1.71Cr,0.28Mo,0.034M,0.0129N）的生产流程为60 t UHP EAF-LF-VD-12.5 t铸锭工艺。试验研究了钢锭加热工艺（1 200-1 220℃,7-8 h-13-15 h）,锻材完全退火（900℃12 h,≤80℃/h至650℃50 h,空冷）、等温退火（900℃12 h,空冷至650℃50 h,空冷）和正火（900℃12 h,空冷）工艺对Φ5