API 5CT Pipe Solutions for Robust Oil and Gas Operations

API-5CT-API-5ST-CASING-AND-TUBING

API 5CT OCTG

API 5CT is your go-to standard for high-quality OCTGs, ensuring that you receive the best in casing, tubing, and pup joints. We offer you a range of options tailored to your project’s specific needs. Whether you are looking for pipes with specific heat treatment, suitable for drilling in challenging environments, or with threaded connections for easy installation, our API 5CT OCTGs provide versatile solutions. From the oil and gas sector to water transport, our API 5CT steel pipes are designed to meet rigorous technical requirements, providing you with a durable and reliable solution for your industrial applications.

API 5CT Specification

When you choose our API 5CT steel pipes, you’re investing in a product that comes with comprehensive specifications, including dimensions that meet international standards, state-of-the-art production procedures, and a variety of steel grades. The steel grades we offer cater to specific requirements, providing options like extreme line casing, integral joint tubing, and external upset tubing. Whether you need pipes with long round thread casing or short round thread casing, our diverse range of specifications meets the demands of different industries.

Our pipes undergo rigorous surface coatings to resist corrosion, and we offer multiple end types and joint methods to suit your project. Additionally, our machining services ensure that your pipes are ready for immediate installation, saving you time and resources.

Production StandardAPI 5CT
Manufacturing ProcessesERW (Electric Resistance Welding)
SMLS (Hot Finished / Cold Drawn Seamless)
Outside DiameterCasing Pipe 114.3 – 508mm; Tubing Pipe 26.67 – 114.3mm
Wall Thickness5.21mm – 22.22mm
Pipe LengthCasing Pipe 4.88 – 14.63 mtrs, Tubing Pipe 6.10 – 12.80 mtrs
Steel GradeAPI 5CT H40API 5CT N80-1
API 5CT J55API 5CT L80Cr
API 5CT K55API 5CT C90-1
API 5CT N80API 5CT T95-1
API 5CT N80QAPI 5CT C110
API 5CT R95API 5CT P110
API 5CT L80API 5CT Q125
Corrosion PreventionLacquer, Varnish, Oiling, Galvanizing
FBE, 2LPP, 3LPP, 2LPE, 3LPE
End ProcessesPlain end, Short Round Thread, Long Round Thread, Buttress Thread, Extreme-line.
Plain end, Non-upset Threaded and Coupled, External upset Threaded and couple,Intergral Joint
Further ProcessingThreading

API 5CT Dimension Table

schematic-diagram-of-pipe-dimension

When you choose our API 5CT steel pipes, you’re investing in a product that comes with comprehensive specifications, including dimensions that meet international standards, state-of-the-art production procedures, and a variety of steel grades. Our pipes undergo rigorous surface coatings to resist corrosion, and we offer multiple end types and joint methods to suit your project. Additionally, our machining services ensure that your pipes are ready for immediate installation, saving you time and resources.

Outside DiameterAPI Casing List-Thickness
inchmmmm
4 1/2114.35.215.696.357.378.56
5127.05.596.437.529.1911.1012.1412.70
5 1/2139.76.206.987.729.1710.5412.7014.2715.8817.4519.0520.6222.22
6 5/8168.37.328.9410.5912.06
7177.85.876.918.059.1910.3611.5112.6513.7215.8817.4519.0520.6222.22
7 5/8193.77.628.339.5210.9212.7014.2715.1115.8817.4519.05
7 3/4196.915.11
8 5/8219.16.717.728.9410.1611.4312.7014.15
9 5/8244.57.928.9410.0311.0511.9913.8415.1115.4717.0718.6420.24
10 3/4273.17.098.8910.1611.4312.5713.8415.1117.0718.6420.24
11 3/4298.58.469.5311.0512.4213.5614.78
13 3/8339.78.389.6510.9212.1913.06
16406.49.5311.1312.5716.68
18 5/847311.05
2050811.1312.7016.13
Outside DiameterAPI Tubing List-Thickness
inchmmmm
126.72.873.91
1 1/333.43.384.55
1 2/342.23.183.564.85
1 8/948.33.183.685.086.357.62
2 1/952.43.065.72
2 3/860.34.244.836.457.498.53
2 7/873.05.517.017.828.649.9611.18
3 1/288.95.496.457.349.5210.9212.0913.46
4101.65.746.658.3810.5412.7015.49
4 1/2114.36.888.569.6510.9212.7014.2216.00

Chemical Requirements of API 5CT

Understanding the importance of chemical composition in steel pipes, we adhere strictly to API 5CT guidelines. Our steel grades, ranging from H40 to Q125, are formulated with precise chemical compositions to enhance durability, corrosion resistance, and strength. Explore the benefits of our API 5CT steel pipes, where the chemical integrity of inner and outer surfaces, thread casings, and coupling materials is maintained with precision. When you opt for our pipes, you’re choosing a product that meets the highest standards in chemical requirements, ensuring long-lasting performance and safety.

API SPECIFICAthN 5CT
Chemical Composition, Mass Fraction (%)
GradeTypeCMnMoCrNiCuPSSi
minmaxminmaxminmaxminmaxmaxmaxmaxmaxmax
123456789101112131415
H400.030
J550.030
K550.030
N8010.0300.030
N80Q0.0300.030
R950.45c1.90.0300.0300.45
L8010.43a1.90.250.350.0300.0300.45
L809Cr0.150.300.600.901.108.0010.00.500.250.0200.0301.00
L8013Cr0.150.220.251.0012.014.00.500.250.0200.0301.00
C9010.351.200.25b0.851.500.990.0200.030
T9510.351.200.25b0.850.401.500.990.0200.030
C1100.351.200.251.000.401.500.990.0200.030
P110e0.030e0.030e
Q12510.35 1.350.851.500.990.0200.010
NOTE   Elements shown shall be repored in product analysis.
  • a   The carbon content for L80 may be increased up to 0.50 % maximum if the product is oil-quenched or polymer-quenched.
  • b   The molybdenum content for Grade C90 Type 1 has no minimum tolerance if the wall thickness is less than 17.78 mm.
  • c  The carbon content for R95 may be increased up to 0.55 % maximum if the product is oil-quenched.
  • d   The molybdenum content for T95 Type 1 may be decreased to 0.15 % minimum if the wall thickness is less than 17.78 mm.
  • d   For EW Grade P110, the phosphorus content shall be 0.020% maximum and the sulfur content 0.010% maximum.

Mechanical Requirements of API 5CT

Mechanical integrity is non-negotiable when it comes to our API 5CT steel pipes. From extreme line casing to integral joint tubing, we guarantee that our products meet the mechanical requirements set forth by API standards, including tensile strength, yield strength, and hardness. The steel grades we offer, along with full-length heat treatment and adherence to specified wall thickness, provide high tensile strength, ensuring the durability and reliability required for critical applications.

Whether it’s the drill pipe, pup joints, or other components, our products undergo a thorough inspection, including checks for surface cracking defects, to ensure they meet or exceed the stringent mechanical standards outlined in API 5CT specifications. This ensures that you receive pipes capable of withstanding the most demanding conditions, providing you with the peace of mind you deserve.

Tensile and Hardness Requirements
GradeTypeTotal Elongation Under LoadYield strength MPaTensile strength MPaHardness a,c maxSpecified Wall ThicknessAllowable Hardness Variation b
minmaxminHRCHBWmmHRC
12345678910
H400.5276552414
J550.5379552517 –
K550.5379552655 –
N8010.5552758689 –
N80Q0.5552758689 –
R950.5655758724 –
L8010.555265565523.0241 –
L809Cr0.555265565523.0241
L8013Cr0.555265565523.0241
C9010.562172468925.4255≤12.70 12.71 to 19.04 19.05 to 25.39 ≥25.403.0 4.0 5.0 6.0
T9510.565575872425.4255≤12.70 12.71 to 19.04 19.05 to 25.39 ≥25.403.0 4.0 5.0 6.0
C1100.775882879330.0286≤12.70 12.71 to 19.04 19.05 to 25.39 ≥25.403.0 4.0 5.0 6.0
P1100.6758965862
Q12510.658621034931b≤12.70 12.71 to 19.04 19.053.0 4.0 5.0
  • a   In case of dispute, laboratory Rockwell C hardness testing shall be used as the referee method.
  • b   No hardness limits, but the maximum variation is restricted as a manufacturing control in accordance with 7.8 and 7.9.
  • c   For through-wall hardness tests of Grades L80(all types), C90, T98 and C110, the requirements stated in HRC scale are for maximum mean hardness number.

Steel Grades in API 5CT

We offer a diverse range of steel grades, including H40, J55, K55, N80, L80, C90, R95, T95, P110, C110, and Q125, to meet the unique demands of your projects. Each grade comes with its own set of benefits, from high tensile strength to exceptional corrosion resistance. When you choose our API 5CT steel pipes, you’re not just getting a product; you’re getting a customized solution that elevates your project’s quality and efficiency.

Production Tolerance of API 5CT

Table – Standard Mass Tolerances
AmountTolerance
Single lengths+6.3% -3.5%
Carload 18,144kg(40,000lb) or more-1.75%
Carload less than 18,144kg(40,000lb)-3.50%
other items 18,144kg(40,000lb) or more-1.75%
other items less than 18,144kg(40,000lb)-3.50%
Table – Dimension Tolerances (pipe OD)
Label 1Tolerances on Outside Diameter, D
< 4 1/2+0.79 mm (±0.031in.)
≥ 4 1/2+1% -0.5% D
Table – Dimension Tolerances (upset integral tubing)
Label 1Tolerances behind m or L0
≤3 1/2 mm+2.38 -0.7mm in.
>3 1/2 to ≤ 5+2.78mm to-0.75 % D(+7/64 in. to-0.75 % D
>5 to ≤ 8 5/8+3.18mm to-0.75 % D (+1/8 in. to-0.75 % D)
>8 5/8+3.97 mm to -0.75 % D(+5/32 in. to-0.75 % D)

Reference Resource

Our Advantages

  1. Over 25 years of experience in pipeline production and installation.
  2. Comprehensive inspection equipment.
  3. Independent product serial numbers for traceability.
  4. Advanced production equipment – Seamer high-frequency welding machine from the United States.
  5. Complete qualifications – API 5L/API 5CT/FM/UL fire pipe certification, etc.
  6. Wide range of products – independently developed solar torque tubes, highly favored in the European market.
  7. Customers spread across the globe.
  8. Excellent after-sales service and sense of responsibility.

Application Scenarios

Our steel pipes are engineered to withstand high temperatures, corrosive environments, and varying pressures, ensuring reliability and safety in the complex petrochemical processes. 

Whether it’s transferring crude oil, natural gas, or chemical intermediates, the robustness and versatility of steel pipes make them indispensable components of the plant’s infrastructure, contributing to efficient production and maintenance of stringent safety standards.

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