ISO 3183 L360 Pipe
ISO 3183 L360 Pipe for High-Pressure Oil & Gas Transmission – Premium Quality from LONGMA GROUP
Hebei Longma Group Limited manufactures ISO 3183 L360 Pipe with a minimum yield strength of 360 MPa, specifically engineered for high-pressure oil, gas, and water transmission projects across global markets. LONGMA GROUP has more than 20 years of manufacturing experience and an annual production capacity of 1,000,000 tons of big diameter and thick wall pipeline systems in compliance with international standards. We have a manufacturing plant of 230,000 square metres and service clients in over 90 countries. Each product is subject to a thorough examination comprising hydrostatic testing, non-destructive testing and mechanical property verification to assure its dependability under difficult working situations.
Understanding ISO 3183 L360 Pipeline Steel
ISO 3183 L360 is a medium to high strength steel grade used in pipelines for fluid and gas transfer in the petroleum and natural gas sectors. The "L360"refers to a minimum yield strength of 360 MPa (API 5L X52 in imperial units).
This grade is a good compromise between strength and weldability. The paper deals with important industrial issues such as sustaining structural integrity across long distance transmission channels, and ensuring reliable operation in different environmental circumstances.
The pipe is offered in two Product Specification Levels: PSL1 for general applications, and PSL2 for projects that need higher mechanical qualities and more stringent control of chemical composition. PSL2 grades need Charpy V-notch impact testing and have narrower maximum yield strength limitations.
Technical Specifications and Material Properties
The product features controlled chemical composition to optimize strength and toughness. Carbon content is typically limited to a maximum of 0.22% for PSL1, while Manganese may reach up to 1.40% for grain refinement and enhanced mechanical performance.
| Property | Specification |
|---|---|
| Grade | L360 (equivalent to API 5L X52) |
| Minimum Yield Strength | 360 MPa |
| Minimum Tensile Strength | 460 MPa |
| Outer Diameter Range | 60.3 - 2032 mm (2" - 80") |
| Wall Thickness Range | 4 - 100 mm |
| Manufacturing Process | SMLS, ERW, LSAW, SSAW |
| Product Specification Level | PSL1 / PSL2 |
| Fastest Delivery Time | 7 Days |
The mechanical properties provide excellent fracture toughness and superior resistance to both longitudinal and circumferential stress. This makes the material highly suitable for pipelines operating under moderate to high pressure conditions.
LONGMA GROUP purchases raw materials from reputed Chinese steel mills such as Shagang, TISCO, BX Steel and Bao Steel. This allows constant material performance and complete manufacturing traceability from steel plate to the completed pipe.
Primary Application Scenarios
Onshore Long-Distance Transmission Systems: The pipe is ideal for cross-country oil and gas pipeline networks where resilience to different soil pressures and seismic activity is crucial. Due to its strength-to-weight ratio, it enables optimised design and lower material usage.
Natural Gas Distribution Networks L360 is the ideal solution for reliable operation of high pressure industrial gas mains in metropolitan areas. This combination of strength and ductility guaranties the operation to be safe under different demand situations.
Offshore Subsea Flowlines The pipe is constructed to PSL2 requirements with sour service capabilities (L360MS). This is used in subsea conditions where resistance to Hydrogen Induced Cracking and Stress Corrosion Cracking is essential owing to the presence of H2S and other corrosive substances.
LONGMA GROUP provides comprehensive fabrication services including welding, perforating, expansion processing, and customized end treatments to meet specific project connection requirements.
Manufacturing Excellence and Quality Assurance
Our production process incorporates advanced heat treatment technology to strengthen weld performance and enhance overall pipe integrity. Every ISO 3183 L360 Pipe undergoes rigorous multi-stage inspection before shipment.
Hydrostatic Testing is done to prove leak proof operation at pressures computed at 100% of the required minimum yield strength. That means your pipeline system will be operating securely within design constraints.
Internal defects in the pipe body and weld seam are established by non-destructive testing using ultrasonic or radiographic techniques. This level of monitoring removes substandard material before it reaches your project site.
Charpy V-Notch Impact Testing is used to meet the low temperature toughness criteria at the prescribed test temperature for PSL2 so that it can resist brittle fracture when operated in cold conditions.
Dimensional Verification verifies wall thickness homogeneity, out-of-roundness, straightness and end squareness to rigorous tolerances. The accuracy allows for easy installation and trouble-free connection integrity.
Comprehensive Anti-Corrosion Protection
Corrosion prevention is the main factor in determining how well pipelines resist corrosion. LONGMA GROUP provides the full range of coating solutions based on your working environment and project requirements.
Hot-dip galvanising offers excellent protection for above ground installations and buildings exposed to climatic conditions. For subterranean pipes FBE, 2PP or sophisticated multi-layer systems such as 3LPE and 3PE are used.
These surface treatments extend service life and reduce maintenance costs over the operational lifetime of your pipeline infrastructure. You can specify coating requirements during the ordering process to match your project's environmental exposure conditions.
Complete Documentation and Certification Support
International engineering projects require comprehensive technical documentation for approval and procurement processes. LONGMA GROUP provides complete documentation packages with every shipment.
Our standard documentation includes Material Test Certificates (MTC) with full heat number traceability, chemical composition analysis reports, and mechanical test results covering yield strength, tensile strength, and elongation values.
You will receive hydrostatic test records, non-destructive testing reports, dimensional inspection data, and visual inspection documentation. For PSL2 pipes, we also provide Charpy impact test results, hardness testing data when required, and weld seam inspection records for welded pipes.
LONGMA GROUP holds multiple certifications including API 5L Certificate, ISO9001 Quality Management System Certificate, ISO 14001 Environmental Management System Certificate, and Factory Production Control (FPC) Certificate. We support third-party inspection by recognized agencies such as BV, TUV, and Intertek when specified in your purchase order.
FAQ
Q：Why should we select the product for our project instead of lower-grade pipeline steels?
A：ISO 3183 L360 offers a minimum specified yield strength of 360 MPa, providing superior mechanical performance compared with lower grades such as L245, L290, and L320. This higher pressure-bearing capability makes it suitable for demanding oil and gas transmission applications. The increased strength may allow you to optimize wall thickness under the same design conditions, reducing material consumption and transportation costs. L360 maintains an excellent balance between strength and weldability, supporting efficient fabrication during pipeline installation. Your final grade selection should align with engineering design requirements including operating pressure, pipe diameter, service temperature, and applicable project specifications.
Q：How can we verify that the supplier can provide qualified products?
A：You should request complete quality documentation including Mill Test Certificates with full heat number traceability, chemical composition analysis, and mechanical test results covering yield strength, tensile strength, and elongation. Hydrostatic test records, non-destructive testing reports, dimensional inspection data, and visual inspection records should be included. For PSL2 pipes, confirm the availability of Charpy V-notch impact testing results, stricter chemical composition control documentation, and hardness testing when required. Verify that your supplier can facilitate third-party inspection support from recognized agencies. LONGMA GROUP provides all required documentation and welcomes third-party inspection to ensure product quality meets your project specifications.
Q：What technical details should we confirm before purchasing products?
A：Confirm the complete pipe specification including outside diameter, wall thickness, pipe length, manufacturing process (SMLS, ERW, LSAW, or SSAW), PSL1 or PSL2 requirement, and pipe end preparation details. Specify mechanical and testing requirements such as minimum yield and tensile strength, impact test temperature and absorbed energy requirements, hydrostatic test pressure, NDT requirements for pipe body and weld seam, and dimensional tolerance limits. Discuss your supplier's previous experience with ISO 3183 L360 production, annual production capacity, delivery schedule capabilities, and availability of inspection facilities. A reliable manufacturer should demonstrate stable production control, accurate documentation practices, and comprehensive project support throughout the entire supply process.
Contact Us
Contact our technical team at info@longma-group.com to discuss your ISO 3183 L360 Pipe specifications and receive detailed quotations with technical support for your upcoming project.
