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Cold drawn seamless steel pipe finish condition

Cold drawn seamless steel pipe finish condition is as follows:

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)

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.


Post time: Mar-09-2023