API 5CT J55 K55 OCTG Description
API Spec 5CT is a specification developed by the American Petroleum Institute (API) for the production of seamless steel tubing for oil well casing and tubing in the oil and gas industry, covering material, property, and testing requirements. J55 and K55 are two commonly used grades under this standard, and they are mainly used in oil drilling scenarios, such as well wall support (casing) and oil and gas transport (tubing).
Comparison of material properties
- Chemical composition
J55 and K55 have phosphorus (P) and sulfur (S) content ≤ 0.030%, other elements (such as carbon, manganese, etc.) are not mandatory; the basic composition is the same.
- Mechanical property
| Grade | yield strength | tensile strength(≥) |
|---|---|---|
| J55 | 379~552 MPa | 517 MPa |
| K55 | 379~552 MPa | 655 MPa |
Core Difference: The K55 has a significantly higher tensile strength than the J55, which is necessary for higher pressure environments.
- Process Requirements
J55 tubes need to be normalized, whereas K55 tubes can be omitted from this process, and the performance requirements can be achieved directly through the controlled rolling and cooling process.
API 5CT J55 K55 Casing Pipe Specification
API 5CT J55 K55 Casing Tubing Specification
|
Product |
API 5CT J55 K55 Casing Pipe |
|
OD |
13.72 mm - 914.4 mm |
|
WT |
1.65 mm - 22 mm |
|
Length |
0.5 m - 20 m |
|
Standard |
API 5CT |
|
Material |
J55,K55,H55, N80,L80,P110 |
Applications
- J55 Steel Pipe
General Environment: The J55 steel pipe is used for casing and tubing of medium and low-pressure oil and gas wells, such as shallow oil and gas extraction.
Length Standard: The J55 steel pipe is divided into three standard lengths: R-1 (4.88~7.62m), R-2 (7.62~10.36m), and R-3 (10.36m or greater).
- K55 Steel Pipe:
High-Pressure Scenario: The K55 steel pipe is used for deep wells or oil and gas transmission pipelines that require higher tensile strength, such as drilling in complex formations.
Extended Use: Some non-API standard K55 steel pipes may also be used for the manufacturing of special drilling tools.
Correlation with other steel grades
The same standard steel grade: In addition to J55 and K55, API Spec 5CT also includes N80, L80, and P110, among other grades, with tensile strength increased step by step to meet the needs of different working conditions.
Alternative materials: In corrosive environments, corrosion-resistant alloy steel pipe (such as the API 5CRA standard) may replace traditional carbon and manganese steel pipe.
GNEE Certifications
GNEE Factory
FAQ
Q: What product information do I need to provide?
A: You need to provide the grade, width, thickness, coating, and the number of tons you need to purchase.
Q: Does the product have quality inspection before loading?
A: Of course, all our products are strictly tested for quality before packaging, and any unqualified products will be destroyed.
Q: How many days can you deliver after confirming the order?
A: For stock: within 5-7 days;
For customized products: around 30 days;
For special sizes: subject to negotiation.
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