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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
Seamless and ERW Welded Pipe | Maximum Phosphorus Content 0.050% |
Mechanical Properties
A252 | Tensile Strength psi (Mpa) | Yield Strength psi (Mpa) |
Grade 1 | 50,000 (345) | 30,000 (205) |
Grade 2 | 60,000 (415) | 35,000 (240) |
Grade 3 | 66,000 (456) | 45,000 (310) |

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