API 5CT is standard technical specifications for steel casing and tubing pipes used for oil wells in petroleum and natural gas industries.
Besides casing and tubing, it also includes pup joints, coupling stock, coupling material, and accessory materials, and establishes requirements for three product specification levels (PSL-1, PSL-2, and PSL-3). The requirements for PSL-1 are the basis of this standard.
• J55/K55
• N80/N80Q/L80
• C90
• R95/T95
• P110/C110
• Q125
API 5CT applies to the following connections which comply with API SPEC 5B:
• SC: Short round thread casing
• LC: Long round thread casing
• BC: Buttress thread casing
• NU: Non-upset tubing
• EU: External upset tubing
• IJ: Integral tubing connections
• Group 1: All casing and tubing in Grades H, J, K, N, and R
• Group 2: All casing and tubing in Grades C, L, M, and T
• Group 3: All casing and tubing in Grade P
• Group 4: All casing in Grade Q
According to the API 5CT standard, steel material used for making the pipe billet shall undergo grain refining treatment. This steel shall contain one or more grain refining elements, such as a certain amount of aluminum, niobium, vanadium, or titanium, so that the austenite grains of the steel Grain refinement.
• Pipes supplied shall be manufactured in seamless type or EW type.
• Couplings, coupling stock, and coupling materials shall be seamless.
• Cold-drawn tubing pipe shall be properly heat treated; otherwise, it is not acceptable.
• Casing and tubing attachment materials shall be seamless pipes unless other types are stated on the order.
| Product name: API-5CT Seamless Casing | Grade: J55 N80 P110 |
| Material: 34CrMo4,H40,J55, K55, N80,L80,M65,C90,T95,P110,Q125 | Standard: API 5CT |
| Technique: Cold Drawn/Hot Rolled | Application: Oil Pipe |
| Outer Diameter: 114.3-762mm | Thickness: 2.87 - 30 mm |
| Special Pipe:API Pipe | Certification: API |
| Secondary Or Not:Non-secondary | |
| Surface Treatment:Black,varnish | Section Shape:Round |
| Place of Origin: China (Mainland) |
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Standard |
API 5CT/ ISO11960 |
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Grade |
Group.1 |
H40/PSL.1, J55/PSL.1, J55/PSL.2, J55/PSL.3, K55/PSL.1, K55/PSL.2, K55/PSL.3, N80(1)/PSL.1, N80(1)/PSL.2, N80(Q)/PSL.1, N80(Q)/PSL.2, N80(Q)/PSL.3 |
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Group.2 |
M65/PSL.1, M65/PSL.3, L80/PSL.2, L80(1)/PSL.1, L80(1)/PSL.3, L80(9Cr)/PSL.1, L80(13Cr)/PSL.1, C90/PSL.1, C90/PSL.2, C90/PSL.3, T95/PSL.1, T95/PSL.2T95/PSL.3 |
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Group.3 |
P110/PSL.1, P110/PSL.2, P110/PSL.3, |
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Group.4 |
Q125/PSL.1, Q125/PSL.2, Q125/PSL.3, |
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Minimum Order Quantity |
20 Ton |
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Outside Diameter Ranges |
Tubing |
1.05 inch to 4 1/2 inch or 48.26mm to 114.3mm |
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Casing |
4 1/2 inch to 30inch or 114.3mm to 762mm |
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Wall Thickness |
According to API 5CT Standard |
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Length |
Tubing |
R1 (6.10m to 7.32m), R2 (8.53m to 9.75m), R3 (11.58m to 12.80m) |
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Casing |
R1 (4.88m to 7.62m), R2 (7.62m to 10.36m), R3 (10.36m to 14.63m) |
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Type |
Seamless |
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Type of End-Finish |
Tubing |
P, I, N, U |
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Casing |
P, S, B, L |
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1. Materials: The chemical compositions have been carefully determined to provide resistance to sulfide stress corrosion
as well as to insure complete through wall hardening.
2.Heat Treatment: Quenching and Tempering are conducted under rigid temperature control to assure homogeneous
physical properties and microstructures.
3.Micro Structure: These grades exhibit fully tempered martensite which is considered to be the most desirable for
resistance to sulfide stress corrosion cracking.
A full length non destructive inspection is performed in accordance with API 5CT for external and internal, longitudinal
and transverse defects with a standard notch depth equal to 5% of the specified wall thickness.
