精密鋼管的幾種交貨狀態(tài)（BK，BKW，BKS，GBK，NBK）

精密鋼管的幾種交貨狀態(tài)（BK，BKW，BKS，GBK，NBK）

精密鋼管的幾種交貨狀態(tài)（BK，BKW，BKS，GBK，NBK）

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.

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