JIS G3466 SS400 sch 40 black seamless steel pipe
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. If you need steel ...
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