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ALLLAND Steel Pipe Supply

API 5CT J55

Welcome to ALLLAND.

We manufacture API 5CT J55 casing and tubing, widely used in oil and gas wells. J55 grade offers reliable strength and toughness, making it suitable for shallow to medium-depth wells and standard operating conditions.

We supply a full range of sizes and thread types, including BTC, STC, and LTC. Each product goes through strict quality control, from raw material inspection to final testing, ensuring full compliance with international standards. Custom specifications are also available to meet different project requirements.

Our products are exported to the Middle East, Southeast Asia, South America, and other regions. For more details or a quotation, feel free to contact us.

  • O.D.: 4-1/2“ – 13-3/8”
  • wall thickness range: 3.18 mm – 16.13 mm
  • End Finish: Plain End (PE), Threaded & Coupled (T&C), Upset Ends
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Alllandsteel is a steel pipe manufacturer based in China with 25 years of experience. 

The facility spans 22,000 square meters, represents a RMB 700 million investment, and operates four production lines (JCOE, ERW, SMLS, SSAW) alongside five coating lines. 

With an annual production capacity of 250,000 tons, the factory covers specifications ranging from Ø406 to Ø1524 and holds multiple international certifications (API/ASTM/EN/ISO/JIS). Focused on steel pipes, creating value for you!

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api 5ct j55
API 5CT J55 is a base steel grade defined in the American Petroleum Institute standard API Spec 5CT. It is a medium-strength oil casing primarily used in shallow and low-pressure wells. The designation J55 indicates a yield strength level of 55 ksi.

API 5CT J55 Pipe Specifications

O.D.: 4-1/2“ – 13-3/8” (Standard casing range)

W.T.:

3.18 mm – 16.13 mm (0.125“ – 0.635”)

Length: Range 1: 4.88–7.62 m Range 2: 7.62–10.36 m (Common) Range 3: 10.36–14.63 m
Connection Types: STC (Short Thread Coupling), LTC (Long Thread Coupling), BTC (Buttress Thread), Premium Connection
Color Code J55: Green Marking (Green band)
End Finish: Plain End (PE), Threaded & Coupled (T&C), Upset Ends
Coating & Protection: Black Paint, Varnish, Thread Protector, 3LPE / FBE
Packaging: Steel Strapping, Bundles, Plastic Caps

API 5CT J55 by ALLLAND Steel Pipe

Authoritative international certifications, including API, ISO, CE, and CNAS.
Specializing in steel pipe manufacturing, we produce ERW, HFW, LSAW, seamless, and OCTG pipes. With a comprehensive product line, we offer one-stop procurement solutions.
We have extensive experience in oil and gas projects and serve the global market.
Our factory is equipped with professional testing equipment to ensure strict quality control.
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API 5CT J55 Cssing & Tubing Sizes Charts

J55 is primarily used in the infrastructure of oil and gas wells, which includes casing and tubing. Casing serves to support the wellbore and isolate the formation, while tubing is used to transport oil and gas. API 5CT J55 is commonly used in non-corrosive environments because its strength is not as high; it is suitable for shallow and medium-depth wells and conventional oil and gas production operations.

API 5CT J55 Casing Dimensions Table
OD (inch) W.T. (mm) Weight (lb/ft)
4-1/2″ 5.21 9.5
4-1/2″ 5.69 10.5
4-1/2″ 6.35 11.6
4-1/2″ 7.37 13.5
4-1/2″ 8.56 15.1
5″ 5.59 11.5
5″ 6.43 13
5″ 7.52 15
5″ 9.19 18
5″ 11.1 21.4
5-1/2″ 6.2 14
5-1/2″ 6.98 15.5
5-1/2″ 7.72 17
5-1/2″ 9.17 20
5-1/2″ 10.54 23
6-5/8″ 7.32 20
6-5/8″ 8.94 24
6-5/8″ 10.59 28
6-5/8″ 12.06 32
7″ 5.87 17
7″ 6.91 20
7″ 8.05 23
7″ 9.19 26
7″ 10.36 29
7″ 11.51 32
7″ 12.65 35
7″ 13.72 38
7-5/8″ 7.62 24
7-5/8″ 8.33 26.4
7-5/8″ 9.52 29.7
7-5/8″ 10.92 33.7
7-5/8″ 12.7 39
7-5/8″ 14.27 42.8
7-5/8″ 15.88 47.1
8-5/8″ 6.71 24
8-5/8″ 7.72 28
8-5/8″ 8.94 32
8-5/8″ 10.16 36
8-5/8″ 11.43 40
8-5/8″ 12.7 44
8-5/8″ 14.15 49
9-5/8″ 7.92 32.3
9-5/8″ 8.94 36
9-5/8″ 10.03 40
9-5/8″ 11.05 43.5
9-5/8″ 11.99 47
9-5/8″ 13.84 53.5
9-5/8″ 15.11 58.4
10-3/4″ 7.09 32.75
10-3/4″ 8.89 40.5
10-3/4″ 10.16 45.5
10-3/4″ 11.43 51
10-3/4″ 12.57 55.5
10-3/4″ 13.84 60.7
10-3/4″ 15.11 65.7
13-3/8″ 8.38 48
13-3/8″ 9.65 54.5
13-3/8″ 10.92 61
13-3/8″ 12.19 68
13-3/8″ 13.06 72

API 5CT J55 Tubing Dimensions Table
OD (inch) Weight (lb/ft) WT (mm)
1.9″ 2.75 3.18
2-3/8″ 4.7 3.18
2-3/8″ 5.95 4.85
2-7/8″ 6.4 4.83
2-7/8″ 6.5 5.51
2-7/8″ 7.9 6.45
3-1/2″ 9.2 5.74
3-1/2″ 10.3 6.35
4″ 11 6.02
4-1/2″ 12.6 6.52
4-1/2″ 12.75 6.88

Theoretical Weight Calculation: Weight (kg/m) ≈ 0.02466 × (OD − WT) × WT

API 5CT J55 Steel Pipe Chemical Composition

J55 is a carbon steel/low-alloy steel. Its chemical composition is designed to ensure good weldability and cold workability, while strictly controlling impurity elements such as phosphorus and sulfur.
Yield Strength 379–552 MPa
Tensile Strength ≥517 MPa
Elongation ≥19%
Hardness ≤197 HB

API 5CT J55 Steel Pipe Manufacturing Process

J55 is typically available in two manufacturing forms: seamless pipe (SMLS) and welded pipe (ERW/HFW).

The standard specifies PSL1: as-rolled; PSL2: normalized or tempered.

Seamless pipe is the most common production method for J55 and is suitable for high-demand wells. Heat treatment involves normalization or as-rolled (PSL1) to enhance toughness and microstructural stability.

The welded pipe process is more suitable for large-diameter J55 casing, capable of diameters ≥ 16″, and is generally formed from steel coil or steel plate raw materials. For more information on steel pipes, please check our blog.

API 5CT J55 Standard Color Code

According to the API Spec 5CT standard, all oil country tubular goods (OCTG: casing and tubing) must be marked with a color code to facilitate quick identification of the steel grade and prevent misuse.

The color code for API 5CT J55 is green, typically applied as a color band or by painting the entire end.

Grade Color Code
J55 Green
K55 Green + White
N80 Red
L80 Red + Brown
P110 White
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Advantages of API 5CT J55

API 5CT J55 is one of the most basic and commonly used steel grades in the API 5CT OCTG (Oil Country Tubular Goods) system.
J55 is classified as a lower-grade OCTG steel under the API 5CT standard, with a yield strength of 379 MPa (55 ksi) and a tensile strength of ≥517 MPa. It is commonly used in shallow wells, low-pressure oil and gas wells, water wells, or geothermal wells.
Its production process is simple, and material costs are significantly lower than those of N80, L80, and P110, making it suitable for large-scale shallow well projects with the lowest cost per well.
J55 offers sufficient basic strength while also providing good machinability and weldability. It is one of the most globally standardized steel grades, with stable supply from steel mills.

API 5CT J55 Typical Applications

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API 5CT J55 is typically used in non-extreme conditions, such as shallow oil and gas development or low-pressure wells; it is not suitable for deep wells, high-pressure environments, or environments containing H₂S.

Oil & Gas Applications Shallow Oil & Gas Wells (Core Application), Early-stage Field Development, Low-pressure Gas Wells
Water & Civil Engineering Water Wells, Geothermal Wells
Construction & Engineering Foundation / Piling Support, Wellbore Protection

FAQ

What is the difference between J55 and K55?

J55 has a tensile strength of ≥ 517 MPa, while K55 has a tensile strength of ≥ 655 MPa. In short, J55 is a more economical base grade, whereas K55 is a more consistent version that offers higher tensile strength at the same yield strength.

Can J55 be used for tubing?

Yes.

J55 is suitable for both casing and tubing and is classified as a dual-purpose grade.

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