API 5CT Steel pipes for use as Casing and Tubing

API 5CT Peotroleum and natureal gas industies - Steel pipes for use as casing or tubing for wells.

API Spec 5CT Casing pipe

Standard Line Pipe has grade designation A and B. Stronger grades have the designation X followed by the specified minimum yield strength of the pipe steel, measured in kilopounds per square inch (abbreviated ksi), e.g.

X60 for pipe having a minimum yield strength of 60 ksi. See the table below for the standard available grades.

Chemical Composition (%)
Grade C≤ Si≤ Mn≤ P≤ S≤ Cr≤ Ni≤ Cu≤ Mo≤ V≤ Als≤
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
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
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
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
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
Note: c: The sum of the columbium [niobium], and vanadium contents shall not exceed 0.06% except that, by agreement between the purchaser and the manufacturer, an alternative maximum may be established.
API 5L PSL 2: Chemical Compositions(%)
Grade C
B 0.24 1.20 0.025 0.015 0.40 c c 0.04 0.25
X42 0.24 1.20 0.025 0.015 0.40 0.06 0.05 0.04 0.25
X46 0.24 1.40 0.025 0.015 0.40 0.07 0.05 0.04 0.25
X52 0.24 1.40 0.025 0.015 0.45 0.10 0.05 0.04 0.25
X56 0.24 1.40 0.025 0.015 0.45 0.10 0.05 0.04 0.25
API 5L PSL 1: Mechanical Properties
Grade Yield Strength (Mpa) Tensile Strength (Mpa)
B ≥245 ≥415
X42 ≥290 ≥415
X46 ≥320 ≥435
X52 ≥360 ≥460
X56 ≥390 ≥490
X60 ≥415 ≥520
API 5L PSL 2: Mechanical Properties
Grade Yield Strength (Mpa) Tensile Strength (Mpa)
B 245-450 415-760
X42 290-495 415-760
X46 320-525 435-760
X52 360-530 460-760
X56 390-545 490-760
Pipe End: 
square ends (straight cut, saw cut, and torch cut). or beveled for welding, beveled, 
Lightly oiled, Hot dip galvanized, Electro galvanized, Black, Bare, Varnish coating/Anti rust oil, Protective Coatings (Coal Tar Epoxy,  Fusion Bond Epoxy, 3-layers PE)

Plastic plugs in both ends, Hexagonal bundles of max. 2,000kg with several steel strips, Two tags on each bundle, Wrapped in waterproof paper, PVC sleeve, and sackcloth with several steel strips, Plastic caps.


Chemical Component Analysis, Mechanical Properties (Ultimate tensile strength, Yield, strength, Elongation), Technical Properties (Flattening Test, Bending Test, Blow Test, Impact Test), Exterior Size Inspection, Hydrostatic Test, X-ray Test.

Mill Test Certificate: EN 10204/3.1B 

Third party inspection: SGS, BV, Lloyds etc.

We have a team of experienced professionals with years of experience in manufacturing.

Tech & Service of Seamless pipe

Seamless pipes are extensively applied for the nuclear device, gas, petrochemical, ship building and boiler industries. Seamless pipes dominates 65% of market share in Chinese boiler industry.

How to make seamless pipe(seamless pipe process)?
Hot Piercing Workshop
Piercing process
The cross roll piercing and pilger rolling process in the size range from approx. 250 to 660 mm outside diameter.
Precision cold drawn steel tube production process
Pipe weld cracks
often follow different mechanisms can be divided into two types of thermal cracking and cold cracking.
How to calculate a steel pipe and tube theoretic weight
Calculate a steel pipe?
Pipe fittings are necessary to join together pipes, or to change the direction of an existing pipe.
Pipe beveling
Pipe beveling is the process where an angle is formed between the edge of the end of a pipe or tube and a plane perpendicular to the surface.
Steel pipe cutting machine
Pipe cutting
Cutting tools have a grinding wheel piece cutting machine (also known as toothless saw), hand saw, cutter and other hand tools.
Packing the steel pipes
There are probably hundreds of different methods for packing a pipe, and most of them have merit, but there are two principles that are vital for any method.


Our team are highly trained and experienced in servicing and producing all types of steel supplies. Whether you've got a large construction project, or need parts for industrial machinery, our team of steel fabrication consultants will ensure that your project is provided with the parts you need, when you need them.

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