易切削钢： Y12 Y13 Y15 Y20 Y30 Y40Mn Y75 YT10Pb Y0Cr18Ni10（Y18-8） C1211 B1113 C1120 C1126 C1 1213 12L13 L14 En18 En1A En7 225M36 220M07 230M07 210M15 210A15 212M36 212M44 240M0710F 20F2 45MF4 S250 S250Pb 10F1 10PbF2 35MF4 45MF4 S300 S300Pb 9SMn36 9SMn28 22S20 40S20 X12CrNiS18-8 9S20 9SMn28 9SMnPb28 10S20 10SPb20 15S20 35S20 45S20 9SMn36 9SMnPb36 SUM12 SUM22 SUM4 ASK-1100 SUM21 SUM22 SUM22L SUM32