The delivery status of steel pipe (BK, BKW, BKS, GBK, NBK)

BK, BKW, BKS, GBK, NBK


Designation
Symbol
Description
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
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)
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.
Annealed
GBK+A
The last Cold forming process is followed by annealing in a controlled atmosphere.
Normalized
NBK+N
The last cold forming process is followed by annealing above the upper transformation point in a controlled atmosphere.

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  1. I know BKS, our hydraulic cylinder tube is made of seamless cold drawn tube of BKS heat treatment, but it seems seldom people uses BKW condition tubes?

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