淬透性和淬硬性的高低:T8,40Cr,20CrMnTi,40.
问题描述：
淬透性和淬硬性的高低:T8,40Cr,20CrMnTi,40.
答
20CrMnTi经过渗碳淬透性好!T8淬硬性好!淬透性 20CrMnTiT840Cr40
淬硬性 T8 ,40Cr40 20CrMnTi