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) | 最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 （+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(軟) | 最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 | 最后冷加工后在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 | 最后冷加工之后,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 | 最后冷加工之后,鋼管在保護氣體下進行正火. |
如果還有什么不懂的,可以給我留言哦!
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