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 交貨狀態(tài) 

 代號(hào) 

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(duì)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.