BK-BKW-BKS-GBK-NBK的意義
網上經常有人問，BK，BKW，BKS，GBK，NBK 是什么意思，我想看了這個大家應該明白了。
|
Designation |
Symbol |
Description |
|
交貨狀態 |
代號 |
說明 |
|
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) |
后冷加工之后不進行熱處理, 從而管子只可能進行很小的變形. | |
|
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(軟) |
后熱處理之后進行小變形量的冷加工, 對鋼管再加工時允許有限的冷變形(例如: 彎曲, 擴口) | |
|
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. |
|
冷加工后消除應力退火 |
后冷加工后在Acl點以下進行退火, 以消除冷加工應力. | |
|
Annealed |
GBK（+A） |
The last Cold forming process is followed by annealing in a controlled atmosphere. |
|
退火 |
后冷加工之后,鋼管在保護氣體下進行完全退火. | |
|
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,鋼管在保護氣體下進行正火. |
上一篇：直縫鋼管架子管
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