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Seamless steel pipe’s process:
Tube prototype — test — skin — test — heat — perforate — acid-washing — grinding — lubrication and drying — welding head — cold-drawing — solution treatment — acid-washing — Pickling passivation — test — cold rolling — deoiling — top crops — drying — inner-polishing — outer-polishing — test — identification — product packing.
Seamless carton steel pipe