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精密管交貨狀態(tài)
| Designation | Symbol | Description |
| 交貨狀態(tài) | 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(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。 |