ALLLAND Steel Pipe Supply
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 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.
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
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
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 |
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.
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 |
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.
Water & Civil Engineering
Water Wells, Geothermal Wells
Construction & Engineering
Foundation / Piling Support, Wellbore Protection
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.
Yes.
J55 is suitable for both casing and tubing and is classified as a dual-purpose grade.
