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简介 11SMn30C易切削钢化学成份： 碳 C :0.10~0.18 硅 Si:≤0.15 锰 Mn:0.80~1.20 硫 S :0.23~0.33 磷 P :0.05~0.10 抗拉强度：σb (MPa):(热轧)390~540; (冷拉)钢材厚度或直径 8~20时:530~755; ＞20~30时:510~735; ＞30时:490~685 伸长率：δ5 (%):(热轧)≥22;(冷轧)≥7.0 断面收缩率：ψ (%):(热轧)≥36 硬度：(热轧)≤170HB;(冷拉)152~217HB 对照我国牌号：Y15