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