BK-BKW-BKS-GBK-NBK的意义
网上经常有人问，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) |
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) |
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 |
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 |
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 |
后冷加工之后,钢管在保护气体下进行正火. |
上一篇：直缝钢管架子管
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