J55 is a casing steel grade defined by API (American Petroleum Institute) for oil drilling purposes, classified as high-quality carbon structural steel. Its domestic equivalent steel grade falls under the DZ series.
This casing is primarily used to support wellbore walls, isolate formation pressures, and transport oil and gas, making it widely applicable in oil wells, gas wells, geothermal wells, and other scenarios. Its outer diameter specifications range from 139.7 to 244.5 mm, with wall thickness between 7.72 and 11.05 mm. Lengths are categorized into three types: R-1 (4.88–7.62 m), R-2 (7.62–10.36 m), and R-3 (over 10.36 m).
Specification
1. Material: J55, K55, L80, N80, P110, H40, M65, C90, C95, T95, Q125, V150 etc.
2. Technique: Hot Rolled
3. Standard: API 5CT
4. Certification: ISO9001-2008
|
Product Name |
Carbon Steel API Spec 5CT Oil Casing Pipe |
|
Material |
Carbon Steel |
|
Technique |
Hot Rolled |
|
Standard |
API 5CT |
|
Out Diameter (OD) |
10-910mm |
|
Wall Thickness (WT) |
2-60mm |
|
Length |
R1 (5.49-6.71m), R2 (8.23-9.14m), R3 (11.58-13.72m) or as customer's requirements |
|
Coupling |
BTC, STC, LTC, NUE, EUE, VAM, BU or no thread |
|
Surface Treatment |
2PE, 3PE, Black painted, anti-corrosion oil or as customer's requirement. |
|
Usage |
Pipeline Transport, Boiler Pipe, Hydraulic/Automobile Pipe, Oil/Gas Drilling, Machinery Industry, Chemical Industry, Mining, Construction & Decoration, Special Purpose |
|
Packing |
1. Packed in waterproof plastic bags
2. Big OD: in bulk 3. Small OD: packed by steel strips 4. According to customer's requirements |
Chemical Composition
|
C |
Mn |
Mo |
Cr |
Ni |
Cu |
Ti |
P |
S |
Si |
V |
Al |
|
|
Min |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
|
Max |
- |
- |
- |
- |
- |
- |
- |
0.030 |
0.030 |
- |
- |
- |
Mechanical Properties
|
Tensile Strength |
517 MPa min |
75,000 psi min |
|
Yield Strength |
379 MPa min |
552 MPa max |
|
55,000 psi min |
80,000 psi max |
|
|
Total Elongation Under Load |
0.500 % |
- |
|
Hardness |
- |
- |
Product manufacturing process
