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API5LX65 is a pipeline steel primarily used in oil and gas transmission pipelines. While it does fall under the category of carbon steel in terms of material classification, it contains trace amounts of alloying elements to enhance its strength. The carbon content of this type of steel is typically between 0.1% and 0.25%, and it exhibits good weldability and formability.
The material characteristics of X65 pipeline steel pipe mainly include the following aspects:
- High strength: The tensile strength of X65 steel is 535-760MPa, which is a high-strength steel.
- The wall thickness of X65 pipeline steel pipe is 0.3~0.8mm and is processed by special equipment after annealing; ordinary carbon structural steel is thick enough to be 0.2~8mm and then pickled to remove oxide scale and then cold-rolled (the cost is higher than that of hot-rolling) tie).
- API 5L X65 Pipe is also suitable for the construction and maintenance of natural gas transmission pipelines. Natural gas pipelines require high corrosion resistance and safety. Due to its good corrosion resistance, API 5L X65 Seamless Line pipe is also commonly used in the construction of submarine pipelines. Submarine pipelines need to withstand severe corrosion from seawater and submarine environments. The excellent performance of X65 steel pipes can extend the service life of the pipelines.
X65 Material Equivalent
| ASTM API 5L | Specification for line pipe | |
|---|---|---|
| Material Grade | PSL1 | L450 or x65 |
| Material Grade | PSL2 | L450Q or X65Q L450M or X65M |
API 5L X65 carbon pipe yield strength
| Grade | Yield Strength | Tensile Strength | Yield to Tensile | Elongation |
|---|---|---|---|---|
| min. (KSI) | min. (KSI) | Ratio (max) | % | |
| API 5L X65 Pipe | 65 | 77 | 0.93 | 18 |
API 5L X65 Seamless Pipe Suppliers and API 5L X65 PSL2 pipe
| API 5L GrB X65 PSL 1 Mechanical Properties | |||
|---|---|---|---|
| Grade | Yield Strength Mpa | Tensile Strength Mpa | Elongation |
| B | 245 | 415 | c |
| X65 | 450 | 535 | c |
X65 seamless steel pipes strictly adhere to API 5L standards (steel pipes for pipeline transportation systems in the oil and gas industry) and also meet the requirements of ISO 3183 standards for marine engineering pipes. Its production process includes:
Bill smelting: Electric furnace/converter smelting + ladle refining ensures precise control of chemical composition;
Piercing and forming: Hot piercing process produces rough pipes, ensuring geometric accuracy;
Quenching and tempering: Online quenching + tempering treatment optimizes grain structure and improves overall mechanical properties;
Non-destructive testing: Ultrasonic testing + eddy current testing of the entire pipe body ensures no defects;
Surface treatment: Shot blasting of inner and outer walls + anti-corrosion coating to adapt to the corrosive marine environment.
API 5L PSL1/PSL2 Line Pipe
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UT(Ultrasonic examination)
AR(As Hot Rolled only)
TMCP (Thermal Mechanical Control Processing)
N(Normalized)
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