GB/T 37775-2019
大型钢质自由锻件通用技术规范
Heavy steel open die forgings— eneral technical specification
2019-08-30 发布
2019-08-30实施
目 次
前言.........................................1
1范围........................................1
2规范性引用文件...................................1
3术语和定义.....................................1
4订货要求......................................2
5制造工艺......................................2
5.1冶炼和浇注..................................2
5.2锻造.....................................2
5.3热处理....................................3
5.4缺陷清除和补焊................................3
6技术要求............................3
6-1化学成分.........................3
6.2力学性能.........................4
6.3硬度均匀性.........................4
6.4金相组织.........................5
6.5残余应力.........................5
6.6无损检测.........................5
6-7尺寸检査.........................5
7检验规则和试验方法 ...................................5
7.1化学成分分析...................................5
7.2力学性能试验...................................6
7.3硬度检验.....................................10
7-4金相检验.....................................10
7.5残余应力测定..................................11
7.6无损检测....................................11
7.7复试......................................11
7.8重新热处理...................................11
8验收和质量证明书....................................11
8.1    验收.....................................11
g    8-2质量证明书..................................11
9标志和包装.......................................12
9-1标志.......................................12
9.2    包装......................................12
附录A （资料性附录）特殊产品的技术和车间评定......................13
附录B（规范性附录）锻造比...............................16
附录C（资料性附录）大型钢质自由锻件常用的材料标准................17
1    TXT/4取样示意图.............................7
图2    tX2t取样示意图..............................7
图3实心轴类锻件取样示意图.............................8
图4筒形锻件取样示意图...............................8
图5饼形锻件取样示意图（外圆加大）.........................8
图6饼形锻件取样示意图（高度増高）.........................8
图7环形锻件取样示意图（外圆加大）.........................9
图8环形锻件取样示意图（高度増高）.........................9
图9相对于锻件的主变形方向时取样位置图......................10
图10相对于锻件的产品几何形状时取样位置图 ...................10
表1成品化学成分允许偏差..............................4
表2锻件的试料和试样数量..............................6