Designation | Symbol | Description |
交貨狀態(tài) | 代號(hào) | 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(jìn)行熱處理, 從而管子只可能進(jìn)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(jìn)行小變形量的冷加工, 對鋼管再加工時(shí)允許有限的冷變形(例如: 彎曲, 擴(kuò)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(yīng)力退火 | 最后冷加工后在Acl點(diǎn)以下進(jìn)行退火, 以消除冷加工應(yīng)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(hù)氣體下進(jìn)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(hù)氣體下進(jìn)行正火. |
