API 5CT Casing and Tubing

Author : admin

Update time : 2026-04-28 08:44:35

　　The main steel grade of API 5CT: API 5CT J55, API 5CT K55, API 5CT N80, API 5CT L80, API 5CT P110. This International Standard is applicable to the following connections in accordance with ISO 10422 or API Spec 5B:

　　short round thread casing (STC);

　　long round thread casing (LC);

　　buttress thread casing (BC);

　　extreme-line casing (XC);

　　non-upset tubing (NU);

　　external upset tubing (EU);

　　integral joint tubing (IJ).

　　For such connections, this International Standard specifies the technical delivery conditions for couplings and thread protection. For pipes covered by this International Standard, the sizes, masses, wall thicknesses, grades and applicable end finishes are defined. This International Standard may also be applied to tubulars with connections not covered by ISO/API standards.

　　Chemical Composition

Grade	C≤	Si≤	Mn≤	P≤	S≤	Cr≤	Ni≤	Cu≤	Mo≤	V≤	Als≤
API 5CT J55	0.34-0.39	0.20-0.35	1.25-1.50	0.020	0.015	0.15	0.20	0.20	/	/	0.020
API 5CT K55	0.34-0.39	0.20-0.35	1.25-1.50	0.020	0.015	0.15	0.20	0.20	/	/	0.020
API 5CT N80	0.34-0.38	0.20-0.35	1.45-1.70	0.020	0.015	0.15	/	/	/	0.11-0.16	0.020
API 5CT L80	0.15-0.22	1.00	0.25-1.00	0.020	0.010	12.0-14.0	0.20	0.20	/	/	0.020
API 5CT J P110	0.26-035	0.17-0.37	0.40-0.70	0.020	0.010	0.80-1.10	0.20	0.20	0.15-0.25	0.08	0.020

Mechanical Properties of API 5CT

Steel Grade	Yield Strength (Mpa)	Tensile Strength (Mpa)
API 5CT J55	379-552	≥517
API 5CT K55	≥655	≥517
API 5CT N80	552-758	≥689
API 5CT L80	552-655	≥655
API 5CT P110	758-965	≥862

　　API 5CT Casing steel pipes The main steel grade of API 5CT: API 5CT J55,API 5CT K55,API 5CT N80,API 5CT L80,API 5CT P110. Packing: Bare/bundles/crates/crate protection at the both sides of tubes or as per customers’ requirements Please feel free to contact us if you have any questions.Email : pipe@stpipefitting.cn

Previous : DIN 17175 seamless steel tube for elevated temperature St35.8

Next : ASTM A312 TP321 Stainless Steel Seamless Pipes Specification

Difference between API 5L X70 and X80 steel pipeline

May .21.2026

In the global long-distance oil and gas pipeline sector, API 5L X70 and X80 steels are the two most widely used high-strength pipeline steel grades. As international energy corridor construction moves towards high pressure, large diameter, and long distances, X80 steel, due to its significant wall-reduction and efficiency-enhancing advantages, is gradually becoming the preferred steel grade for the next generation of trunk pipelines;

Schedule 80 vs Schedule 40 Seamless Black Steel Pipe

May .19.2026

The biggest difference between Schedule 40 and Schedule 80 seamless black steel pipe is wall thickness and pressure capacity. Schedule 80 pipe has thicker walls, so it can handle higher pressure, stronger impact, and harsher industrial environments.

GB/T8163 Seamless steel tubes pipes for liquid service

May .14.2026

GB/T8163 Seamless Pipe Sizes (O.D. x W.T):21.3 mm-914mm x 2m-60m 2)Standard:GB/T8163 3)GB/T8163 Seamless Pipe Steel Grade:20#,16MN,Q345B 4)Surface:oiled or black painted to prevent rust 5)Marking

Material and Size of ASTM A53 Galvanized Pipe Complete Guide

May .12.2026

ASTM A53 Galvanized pipe is one of the most widely used steel pipe products in building, water supply, fire protection, agricultural, and industrial piping systems. For many newcomers to decoration, construction, or DIY building, the technical terms like "Q235," "DN25," "4-point," and "Sch40" used by vendors can often leave them confused.

Have Any Questions?

DON'T HESITATE TO CONTACT US ANY TIME.