API 5L L360 is a pipeline steel material widely used in the oil and gas transportation industry. This steel is manufactured according to the 5L standard set by the American Petroleum Institute (API), and has specific chemical composition and mechanical property requirements. L360 indicates that the material's minimum yield strength is 360 MPa (approximately 36,000 psi), classifying it as a medium-strength pipeline steel.
The performance characteristics of API 5L L360 seamless steel pipe are mainly reflected in the following aspects:
1. High Strength: L360 indicates its minimum yield strength of 360 MPa, enabling the steel pipe to withstand high pressures and making it suitable for various high-pressure transportation scenarios.
2. Good Toughness: The steel pipe has good impact toughness and ductility, maintaining stable performance in low-temperature environments and avoiding brittle fracture caused by temperature changes.
3. Excellent Corrosion Resistance: L360 grade steel pipe undergoes special treatment, exhibiting good corrosion resistance and enabling long-term stable operation in harsh environments such as humid and corrosive media.
4. Reliable connection performance: The steel pipes utilize advanced welding technology and connection processes to ensure strong and airtight pipe connections, effectively preventing leaks and safety accidents.
5. Good machinability: The steel pipes are easy to cut, bend, and install, facilitating construction and maintenance.
Chemical Composition Requirements:
C: ≤0.28 (seamless) ≤0.26 (welded)
Mn: ≤1.40
P: ≤0.030
S: ≤0.030
Cu: ≤0.50
Ni: ≤0.50
Cr: ≤0.50
Mo: ≤0.15
*V+Nb+Ti: ≤0.15
*For every 0.01% decrease in carbon content, manganese content can increase by 0.05%, up to a maximum of 1.65%.
Mechanical Property Requirements:
Yield Strength: ≥360 MPa
Tensile Strength: ≥460 MPa
Tensile Strength of Welded Steel Pipe: ≥460 MPa
Elongation: ≥1940*AXC0.2/4600.9 where AXC is the cross-sectional area of the tensile specimen.
API L360 Line Pipe Application Areas:
Onshore/Subsea Oil and Gas Gathering and Transmission Pipelines: The main trunk connecting wellheads, processing plants, and the starting points of long-distance pipelines.
Medium and Low Pressure Long-Distance Transmission Trunk Lines: Undertake the core task of large-scale cross-regional transportation of oil and gas resources.
Urban Gas Pipelines: A key component of medium-pressure distribution systems, ensuring the safety of gas supply for both residential and industrial use.
Water/Gas Injection Pipelines: Important engineering pipelines for increasing and stabilizing oilfield production.
Industrial Gas Transportation: Oxygen, nitrogen, carbon dioxide, etc.
Hydraulic Pipelines: Large-scale water diversion projects, power plant circulating water pipelines (corrosion protection requirements vary).
Structural Pipe Piles: Utilizing their excellent mechanical properties and weather resistance, used in wharves, foundations, etc.
