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API 5CT Oilfield Casing and Tubing

The API 5CT oilfield casing and tubing achieve API SPEC 5CT standards. Our tubular product is suitable for the drilling of petroleum wells. The oilfield casing is applied to support the wall of a well in the drilling process and after well completion, so as to make sure the drilling project goes on smoothly and the well can be used regularly after well completion. The oilfield tubing may transport crude oil and natural gas from a hydrocarbon reservoir to the ground.

Nearly all our casings are manufactured from quality continuous casting, and feature high purity, good homogeneity and flawless surface.

Parameters
1. Standard: API 5CT
2. Steel grade: J55, K55, N80-1
3. Delivery condition: Rolling, normalizing rolling, normalizing
4. Outer diameter: 70MM-610MM
5. Wall thickness: 6MM-35MM
6. Tolerance: In accordance with API 5CT standard
7. Length: R1, R2, R3
8. Certificate: EN 10204/3.1

Chemical Composition (Heat Analysis)%

Steel grade Delivery condition C (max.) Si (max.) Mn (max.) P (max.) S (max.)
J55 Rolling, normalizing rolling, normalizing / / / 0.030 0.030
K55 Rolling, normalizing rolling, normalizing / / / 0.030 0.030
N80-1 Rolling, normalizing rolling, normalizing / / / 0.030 0.030

Mechanical Property of Oilfield Casing and Tubing

Steel grade Yield strength (mpa) Min. tensile strength (mpa) Min. elongation (%)
J55 379-552 517 API 5CT standard
K55 379-552 655
N80-1 552-758 689

Oilfield Tubing Specification

Specification Outer diameter Wall thickness Processing mode of ends
in. mm in. mm J55 K55 N80-1
2-7/8" 2.875 73.00 0.276 7.01 P P P
0.308 7.82 P P P
0.340 8.64 P P P
0.392 9.96 P P P
0.440 11.18 P P P
3-1/2" 3.500 88.90 0.254 6.45 P P P
0.289 7.34 P P P
0.375 9.53 P P P
0.430 10.92 P P P
0.476 12.09 P P P
0.530 13.46 P P P
4" 4.000 101.60 0.262 6.65 P P P
0.330 8.38 P P P
0.415 10.54 P P P
0.500 12.70 P P P
4-1/2" 4.500 114.30 0.271 6.88 P P P
0.337 8.56 P P P
0.380 9.65 P P P
0.430 10.92 P P P
0.500 12.70 P P P
0.560 14.22 P P P
0.630 16.00 P P P

Oilfield Casing Specification

Specification Outer diameter Wall thickness Processing mode of ends
in. mm in. mm J55 K55 N80-1
4-1/2" 4.500 114.3 0.250 6.35 P P P
0.290 7.37 P P P
0.337 8.56 P P P
5 5.000 127 0.253 6.43 P P P
0.296 7.52 P P P
0.362 9.19 P P P
0.437 11.10 P P P
0.478 12.14 P P P
0.500 12.70 P P P
5-1/2" 5.500 139.7 0.244 6.20 P P P
0.275 6.99 P P P
0.304 7.72 P P P
0.361 9.17 P P P
0.415 10.54 P P P
0.500 12.70 P P P
0.562 14.27 P P P
0.625 15.88 P P P
0.687 17.45 P P P
0.750 19.05 P P P
0.812 20.62 P P P
0.875 22.22 P P P
6-5/8" 6.625 168.3 0.288 7.32 P P P
0.352 8.94 P P P
0.417 10.59 P P P
0.475 12.07 P P P
7 7.000 177.8 0.317 8.05 P P P
0.362 9.19 P P P
0.408 10.36 P P P
0.453 11.51 P P P
0.498 12.65 P P P
0.540 13.72 P P P
0.625 15.88 P P P
0.687 17.45 P P P
0.750 19.05 P P P
0.812 20.62 P P P
0.875 22.22 P P P
7-5/8" 7.625 193.68 0.300 7.62 P P P
0.328 8.33 P P P
0.375 9.52 P P P
0.430 10.92 P P P
0.500 12.70 P P P
0.562 14.27 P P P
0.595 15.11 P P P
0.625 15.88 P P P
0.687 17.45 P P P
0.750 19.05 P P P
8-5/8" 8.625 219.08 0.304 7.72 P P P
0.352 8.94 P P P
0.400 10.16 P P P
0.450 11.43 P P P
0.500 12.70 P P P
0.557 14.15 P P P
9-5/8" 9.625 244.48 0.352 8.94 P P P
0.395 10.03 P P P
0.435 11.05 P P P
0.472 11.99 P P P
0.545 13.84 P P P
0.595 15.11 P P P
0.609 15.47 P P P
0.672 17.07 P P P
0.734 18.64 P P P
0.797 20.24 P P P
10-3/4" 10.750 273.05 0.350 8.89 P P P
0.400 10.16 P P P
0.450 11.43 P P P
0.495 12.57 P P P
0.545 13.84 P P P
0.595 15.11 P P P
0.672 17.07 P P P
0.734 18.64 P P P
0.797 20.24 P P P
11-3/4" 11.750 298.45 0.333 8.46 P P P
0.375 9.53 P P P
0.435 11.05 P P P
0.489 12.42 P P P
0.534 13.56 P P P
0.582 14.78 P P P
13-3/8" 13.375 339.72 0.430 10.92 P P P
0.480 12.19 P P P
0.514 13.06 P P P
Notes:
1. “P” refers to plain end.
2. Customization is available with other specification.
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