| 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） |
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） |
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(yīng)力退火 |
后冷加工后在Acl點以下進行退火， 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 |
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。 |
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