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我们做精密钢管的经常有人会问：BK，BKW，BKS，GBK，NBK 是什么意思？ 
我想看了这个大家应该明白了，其实这个就是DIN2391,EN10305,GB/T3639 等标准的交货状态的代号： Designation | Symbol | Description
| 交货状态 | 代号 | 说明
| Cold finished (hard) | BK（+C） | Tubes do not undergo heat treatment following the final cold forming and, thus, have a rather high resistance to deformation | 冷加工(硬) | 最后冷加工之后不进行热处理, 从而管子只可能进行很小的变形. | Cold finished (Soft) | BKW
（+LC） | The final heat treatment is followed by cold drawing involving limited deformation. Appropriate further processing allows a certain degree of cold forming (e.g. bending, expanding) | 冷加工(软) | 最后热处理之后进行小变形量的冷加工, 对钢管再加工时允许有限的冷变形(例如: 弯曲, 扩口) | Cold finished and stress-relieved | BKS（+SR） | Heat treatment is applied following the last cold forming process. Subject to appropriate processing conditions, the increase in the residual stresses involved enables both forming and machining to a certain degree. | 冷加工后消除应力退火 | 最后冷加工后在Acl点以下进行退火, 以消除冷加工应力. | Annealed | GBK（+A） | The last Cold forming process is followed by annealing in a controlled atmosphere. | 退火 | 最后冷加工之后,钢管在保护气体下进行完全退火. | Normalized | NBK（+N） | The last cold forming process is followed by annealing above the upper transformation point in a controlled atmosphere. | 正火 | 最后冷加工之后,钢管在保护气体下进行正火. |
如果还有什么不懂的,可以给我留言哦!
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