alloyed steel oil-quenching and tempering) 1.standard:55CrSi,65Mn,72A, ... ,60Si2Mn,50CrVA,T9A 2.norminal diameter:0.2-4.0 alloyed steel oil-quenching and tempering)we could provide various favorable ... .0-4.0the tolerance: +-0.008, +-0.010, +-0.015 alloyed steel(oil-quenching and tempering)