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. |
版權：山東成達鋼管有限公司——15年生產經驗 您值得信賴的鋼管制造廠家??！ 免責聲明：所提供的信息及資料除原創外，部分資訊來源于網絡等媒體僅供參考，不作為直接決策建議。如無意中侵犯您的合法權益，請及時聯系與處理。 |
