API 5CT /5B seamless Casing and tubing, K55, OD 4 1/2″ STC oil and gas pipeline

API 5CT CASING TUBING ,Couplings, pup joints Testing of chemical composition
December 17, 2016
boiler tube
ASME SA192, Sch40,high-pressure carbon steel seamless boiler tube
December 21, 2016