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个人中心收藏查看我的收藏0有用+10播报讨论上传视频合金结构钢是中国国家标准GB/T 3077系列下的中碳调质锰钢，属于合金结构钢，对应国际牌号包括德国50Mn7（DIN 1.0913）、美国ASTM 1050、日本S53C等 [1]。其碳含量为0.47%-0.55%，锰含量1.40%-1.80%，并含有微量硅、磷、硫等元素，执行标准涵盖GB/T 3077-1999及更新版本。该材料具有高强度、高弹性及耐磨性，经调质处理后抗拉强度≥930MPa，屈服强度≥785MPa，延伸率≥9%，油淬临界淬透直径10-28mm，水淬可达24-49mm，但存在过热敏感性和回火脆性倾向，焊接性较差且水淬易开裂。推荐采用820℃油淬加550℃水/油回火的热处理工艺，退火状态硬度≤229HBS。主要用于制造高应力、高磨损工况零件，如重型机械主轴、汽车传动轴、齿轮、曲轴及轧辊轴承座等，正火加高温回火后也可用于中等负荷大型零件。此外，其能替代45Cr钢制造直径80mm以下零件，并适用于板弹簧、平卷簧等弹性元件。中文名
外文名50Mc2
特    性有高的强度、弹性和耐磨性
标    准GB/T 3077-1999
碳    C0.47～0.55
试样毛坯尺寸：25（mm）

目录
1产品介绍2力学性能3化学成分4表示方法
产品介绍
播报编辑，合金结构钢。标准：GB/T 3077-1999【主要特性】这是一种高强度中碳调质锰钢，它具有高的强度、弹性和耐磨性，同时淬透性也较高，在油中临界淬透直径达10～28mm，在水中临界淬透直径达24～49mm，可切削性尚可。此钢经调质后可得到较高的综合力学性能，但热处理时有过热敏感性及回火脆性，水淬时也有产生裂纹的倾向，且对白点敏感，焊接性差，冷变形塑性低。【应用举例】这种钢通常是在调质后使用，用于制造高应力及磨损条件下工作的零件，制造直径80mm以下的零件时钢的性能与45Cr相近；也可在正火及高温回火后使用，用于制造中等负荷、截面尺寸较大的零件。例如：重型机械上用作滚动轴承中的主轴、轴及大型齿轮；汽车上的传动花键轴以及承受冲击负荷的心轴；一般机械上用作齿轮、蜗杆、齿轮轴、曲轴、连杆等。此外，此钢还可用来制造板弹簧及平卷簧等。
力学性能
播报编辑【力学性能】热处理：第一次淬火加热温度（℃）：820；冷却剂：油第二次淬火加热温度（℃）：-回火加热温度（℃）：550；冷却剂：水、油抗拉强度（σb/MPa）：≥930屈服点（σs/MPa）：≥785断后伸长率（δ5/%）：≥9断面收缩率（ψ/%）：≥40冲击吸收功（Aku2/J）：≥39布氏硬度（HBS100/3000）（退火或高温回火状态）：≤229
化学成分
播报编辑硅Si：0.17～0.37锰Mn：1.40～1.80磷 P：≤0.025 （残留含量）硫 S：≤0.025 （残留含量）铬 Cr：≤0.30 (残留含量)镍 Ni：≤0.30 （残留含量）铜 Cu：≤0.25 （残留含量）
表示方法
播报编辑① 钢号开头的两位数字表示钢的碳含量，以平均碳含量的万分之几表示，如40Cr、25Cr2MoVA合金管②钢中主要合金元素，除个别微合金元素外，一般以百分之几表示。当平均合金含量＜1.5%时，钢号中一般只标出元素符号，而不标明含量，但在特殊情况下易致混淆者，在元素符号后亦可标以数字"1"，例如钢号"12CrMoV"和"12Cr1MoV"，前者铬含量为0.4-0.6%，后者为0.9-1.2%，其余成分全部相同。当合金元素平均含量≥1.5%、≥2.5%、≥3.5%……时，在元素符号后面应标明含量，可相应表示为2、3、4……等。例如18Cr2Ni4WA。③钢中的钒V、钛Ti、铝AL、硼B、稀土RE等合金元素，均属微合金元素，虽然含量很低，仍应在钢号中标出。例如20MnVB钢中。钒为0.07-0.12%，硼为0.001-0.005%。④高级优质钢应在钢号最后加"A"，以区别于一般优质钢。⑤专门用途的合金结构钢，钢号冠以（或后缀）代表该钢种用途的符号。例[(外径-壁厚)*壁厚]*0.02466=kg/米(每米的重量)新手上路成长任务编辑入门编辑规则本人编辑我有疑问内容质疑在线客服官方贴吧意见反馈投诉建议举报不良信息未通过词条申诉投诉侵权信息封禁查询与解封©2025 Baidu 使用百度前必读 | 百科协议 | 隐私政策 | 百度百科合作平台 | 京ICP证030173号 京公网安备11000002000001号window.PAGE_DATA= 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