无缝钢管-精密钢管 的几种交货状态（BK,BKW,BKS,GBK,NBK）
上经常有人问，BK，BKW，BKS，GBK，NBK 是什么意思，我想看了这个大家应该明白了。
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
|
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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