冷鐓鋼(GB/T6478—1986)，衝擊韌度aML25MnML30MnML20MnTiBML42CrMo
牌號 | 化學成分(質量分數)(%) | ||||
C | Si | Mn | Cr | 其 他 | |
ML08 | 0.05～0.12 | ≤0.03 | O.20～0.50 | O.7～1.0 | |
MLlO | 0.07～O.14 | ||||
MLl5 | O.12～O.19 | ≤0.07 | |||
M120 | 0.17～0.24 | ||||
ML25 | 0.22～O.30 | ≤O.20 | 0.30～O.60 | ||
ML30 | O.27～O.35 | ||||
ML35 | 0.32～O.40 | ||||
ML40 | O.37～0.45 | ||||
ML45 | 0.42～0.50 | ||||
ML2SMn | 0.22～O.30 | ≤0.25 | 0.50～O.80 | ||
MIJ30Mn | O.27～0.35 | ||||
ML35Mn | O.32～0.40 O.37～O.45 | ||||
ML40Mn | |||||
ML45Mn | O.42～O.50 | ||||
MLl5Cr | O.12～O.18 | ≤0.30 | 0.40～O.70 | ||
ML20Cr | O.17～0.24 | O.50～O.80 | |||
ML40Cr | 0.37～0.44 | O.80～1.10 | |||
MLl5MnB | O.14～O.20 | 1.20～1.60 | BO.0005～O.0035 | ||
MLl5MnVB | O.12～0.18 | V0.07～O.12 BO.0005～0.0035 | |||
ML20MnT-B | O.17～O.24 | 1.30～1.60 | BO.0005～0.0035 TjO.04～O.10 | ||
M100CrMo | O.26～O.34 | 0.40～0.70 | O.80～1.10 | Mo0.15～0.25 | |
ML35CrMo | 0.32～0.40 | O.40～O.70 | |||
ML42CrM0 | 0.38～0.45 | O.50～0.80 | O.90～1.20 |
ML25ML30ML35ML40ML45ML35MnML40MnML45MnML20CrML40CrML35CrMo
牌號 | 抗拉強度 ób | 屈服點ós | 伸長率ó5 | 斷面收縮率Ψ | 衝擊韌度ak | 硬 度 | ||
熱軋 | 退火 | |||||||
MPa | % | J/cm2 | 壓痕直徑 /mm | 布氏硬度 HBS | 壓痕直徑 /mm | 布氏硬度 HBS | ||
≥ | ≥ | ≤ | ≥ | ≤ | ||||
ML08 | 334 | 196 | 33 | 60 | 5.2 | 131 | ||
MLl0 | 333 | 206 | 3l | 55 | 5.1 | 137 | ||
MLl5 | 377 | 226 | 27 | 55 | 5.0 | 1,13 | ||
ML20 | 412 | 245 | 25 | 55 | 4.8 | 156 | ||
M125 | 451 | 275 | 23 | 50 | 4.6 | 170 | ||
ML30 | 490 | 296 | 2l | 50 | 4.5 | 179 | ||
M135 | 530 | 314 | 20 | 45 | 4.4 | 187 | ||
ML40 | 569 | 333 | 19 | 45 | 4.1 | 217 | 4.4 | 187 |
ML45 | 598 | 353 | 16 | 40 | 4.0 | 229 | 4.3 | 197 |
ML25Mn | 451 | 275 | 23 | 50 | 4.6 | 170 | ||
ML30Mn | 490 | 294 | 21 | 50 | 4.5 | 179 | ||
ML35Mn | 530 | 314 | 20 | 45 | 4.4 | 187 | ||
ML40Mn | 569 | 333 | 19 | 45 | 4.1 | 217 | 4.4 | 187 |
ML45Mn | 598 | 353 | 16 | 40 | 4.0 | 229 | 4.3 | 197 |
MLl5Cr | 686 | 490 | lO | 45 | 69 | 4.5 | 179 | |
ML20Cr | 785 | 588 | lO | 40 | 59 | |||
ML4OCr | 981 | 785 | 9 | 45 | 59 | 4.2 | 207 | |
MLl5MnB | 1128 | 932 | 9 | 69 | ||||
MLl5MnVB | 1079 | 883 | 10 | 4.2 | 207 | |||
ML20MnTiB | 1128 | 932 | 4.4 | 187 | ||||
M130CrMo | 932 | 785 | 12 | 50 | 78 | 4.0 | 229 | |
M135CrMo | 981 | 834 | 45 | |||||
ML42CrMo | 1079 | 932 | 4.1 | 217 |
衝擊韌度aML25MnML30MnML20MnTiBML42CrMo
牌 號 | 試樣熱處理制度 |
ML08、MLlO、MLl5、ML20、ML25、 ML30、ML35、ML40、ML45、ML25Mn、ML30Mn、ML35Mn、ML4OMn、ML45Mn | 加熱到高於臨界點30～50℃，保溫30min以上，空冷 |
MLl5Cr、ML20Cr | 一次淬火880℃，二次淬火800℃，水、油冷，回火200℃，水、空冷 |
ML40Cr | 淬火850℃，油冷，回火520℃，水、油冷 |
MLl5MnB | 淬火880℃，水冷，回火200℃，水、空冷 |
MLl5MnVB | 淬火880℃，油冷，回火200℃，水、空冷 |
ML20MnTiE | 淬火860℃，油冷，回火200℃，水、空冷 |
ML30CrMo | 淬火880℃，水、油冷，回火540℃，水、油冷 |
ML35CrMo | 淬火850℃，油冷，回火550℃，水、油冷 |
ML42CrMo | 淬火850℃，油冷，回火560℃，水、油冷 |
二次淬火800℃，水、油冷，回火200℃，水、空冷ML30CrMo
