API 5CT is the Standard issued by American Petroleum Institute, is a specification for seamless casing and tubing. Similar to grade J55 tubing, K55 has better tensile strength, thermal fatigue resistance, and crack resistance than J55. World iron & steel is one of the leading China Casing Pipe manufacturers and suppliers, if you want to buy or import high-quality API K55 casing pipe, API 5CT OCTG from a professional company, factory, seller, and exporter, please feel free to contact us.
OD＜114.3mm tolerance ±0.79
OD≥114.3mm tolerance -0.5% +1%