广东===锰。钢中锰与硫形成硫化锰夹杂,使切屑易于断裂,改善钢的切削性,还能消除或减弱因硫所引起的热脆性。因此,在易切削钢中应保证锰含量在0.60%~1.60%之间,并保持适当的Mn/S的比值。易切削结构钢中碳含量以0.15%~0.25%为宜。易切削结构钢:Y12 Y12Pb Y15 Y15Pb Y20 Y30 Y35 Y40Mn Y45Ca 15S10 10S20 10SPb20 15S22 35S20 35SPb20 46S20 46SPb20 60S20 60SPb20 11SMn30 11SMnPb30 11SMn37 11SMnPb37 易切削钢:130M15 212M36 214M15 216M44210A15 210M15 214A15 214M15 280M01 11SMn30 11SMnPb30 11SMn37 11SMnPb37 10S20 10SPb20 15SMn13 35S20 35SPb20 36SMn14 36SMn14 36SMnPb14 38SMn28 38SMnPb28 44SMn28 44SMnPb28 46S20 46SPb20