Designation | Symbol | Description | 交货状态 | 代号 | 说明 | 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) | 最后冷加工之后不进行热处理, 从而管子只可能进行很小的变形. | 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(软) | 最后热处理之后进行小变形量的冷加工, 对钢管再加工时允许有限的冷变形(例如: 弯曲, 扩口) | 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. | 冷加工后消除应力退火 | 最后冷加工后在Acl点以下进行退火, 以消除冷加工应力. | 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,钢管在保护气体下进行完全退火. | 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,钢管在保护气体下进行正火. |
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