A.合金結(jié)構(gòu)鋼 B.合金工具鋼; C.碳素工具鋼; D.低合金刃具鋼; E.高碳低合金鋼;
A.鑄鋁; B.硬鋁; C.鍛鋁; D.防銹鋁;
A.20CrMnTi表面淬火+回火; B.20CrMnTi滲碳淬火+回火; C.40Cr表面淬火+回火; D.40Cr滲碳淬火+回火;