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  • API 5CT Steel Pipe

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API 5CT Steel Pipe
API is an acronym for the American Petroleum Institute and is considered the most authoritative and comprehensive principle in the oil and gas industry. API 5B and API 5CT are mainly used for oil casing. API 5CT oil casing can be divided into seamless steel pipe and welded steel pipe.
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API 5CT Steel Pipe Description

API 5CT is a standard technical specification of steel pipes for casing and tubing in oil or gas industries. It can be used in oil or gas drilling and conveying. Commonly used oilfield API-5CT casing steel grades are J55, K55, N80-1, N80Q, P110. Casings are mostly used in oil well drilling. According to the API-5CT standard, pipes can be divided into STC (short thread), LTC (long thread) and BTC (support thread) and their joints.


Product Parameters

Product Name

API 5CT Steel Pipe

Standard

EN/DIN/JIS/ASTM/BS/ASME/AISI etc.

Outer Diameter

Seamless: 1/4"-36"

Welding: 21.3mm-3620mm

Round Tube: 1/2"-10"

Square Tube/Rectangular Tube: 15x15mm-400x600mm

Wall Thickness

Seamless: 1.25mm-50mm

Welding: 1.65mm-65mm

Length

3-12 meters, Support customization

Surface Process

Bright, Polished, Black

Other Services

Machining(cnc), Centerless Grinding(cg), Heat Treatment, Annealing, Pickling, Polishing, Rolling, Forging, Cutting, Bending, Small Machining, etc.

 

Chemical Composition

Grade

C≤

Si≤

Mn≤

P≤

S≤

Cr≤

Ni≤

With:

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

0.08

0.020

 

Mechanical Properties

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

 

Scope of Application

API 5CT oil casing is mainly used to transport oil, natural gas, coal gas, water and other liquids, gases.

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