Introduce Oil Casing Pup Joint
The oil casing pup refers to the length of the oil casing outside the standard.
The main materials of oil casing pup joints are J55, K55, N80, L80, C90, T95, P110. Hot rolling process round tube blank→heating→piercing→three-roll skew rolling, continuous rolling or extrusion→tube removal→sizing (or diameter reduction)→cooling→straightening→hydraulic test (or flaw detection)→marking→warehousing ;Cold drawn (rolled) seamless steel pipe round tube billet → heating → perforation → heading → annealing → pickling → oiling (copper plating) → multi-pass cold drawing (cold rolling) → billet → heat treatment → straightening → Hydraulic test (flaw detection)→marking→warehousing
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