The influence of the Al content on 20CrMo autstenitic grain size was studied.The research showed the quenched autstenitic grain size was mixed and the carburized autstenitic grain size wasn't mixed when the product Al content of 20CrMo was between 0.015％and 0.020％;the quenched and carburized autstenitic grain size were all not mixed when the product Al content of 20CrMo was not less than 0.020％.In order to avoid the mixed size of the quenched autstenitic grain,the product Al content of 20CrMo must be not less than 0.020％.In order to meet this requirements,the Al content of melting composition of steel making of 20CrMo was controlled between 0.030％and 0.050％at best.
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