API 5L-B steel pipe, also known as L245 pipeline steel, is a high-performance metal material specifically designed for oil and gas transmission pipelines. It conforms to the internationally recognized API SPEC 5L standard and is widely used in engineering fields such as oil and natural gas pipelines. With its excellent mechanical properties, corrosion resistance, and processing adaptability, it has become the preferred material for energy transportation infrastructure construction.
API 5L Grade B pipe for oil and gas Specification
| Level | API 5L Grade B PSL1, PSL2 |
| Size: | NPS 1/2″ to 60″ Daimeter |
| Length | 20 FT, 40 FT, DRL, SRL |
| Standards | 10208-2, EN 10208-2, API Spec.5L |
| Manufacturing Types | Seamless, ERW, LSAW, DSAW, HSAW |
| Dimensional Standard | ASME B36.10M |
| Equivalent | Grade B-L245 |
| Wall Thickness | SCH 20 to SCH 160 |
| Melting Point | 1420-1520 °C |
| MTC | EN 10204 3.1 & 3.2 |
API 5L Grade B Sour Service Pipe chemical composition
| PSL |
C (Max) |
Mn (Max) |
P (Max) |
S (Max) |
| PSL1 |
0.26 |
1.20 |
0.030 |
0.030 |
| PSL2 |
0.22 |
1.20 |
0.025 |
0.015 |
API 5L Grade B Seamless Pipe yield strength mpa
| Grade B | PSL1 | PSL2 |
|---|---|---|
| Min Yield Strength: | 35,000 psi | 35,000 psi |
| Max Yield Strength: | None | 65,000 psi |
| Min Tensile Strength: | 60,000 psi | 60,000 psi |
| Max Tensile Strength: | None | 110,000 psi |
Carbon Steel API 5L Gr B Pipe Roughness Value
| API 5L Grade B Pipe condition | Roughness in mm | Roughness in inch |
|---|---|---|
| drawn, and new | 00.02 - 0.1 | 00.0008 - 0.004 |
| welded, and new | 00.05 - 0.1 | 00.002 - 0.004 |
| heavy scaling | 1.5 - 4 | 00.06 - 0.16 |
| galvanized, and new | 00.15 | 00.006 |
| used, and cleaned | 00.15 - 0.2 | 00.006 - 0.008 |
| lightly corroded | 00.1 - 0.4 | 00.004 - 0.016 |
| bitumed coated | 00.05 | 00.002 |
| severely corroded | 00.4 - 3 | 00.016 - 0.12 |
| light scaling | 1 - 1.5 | 00.04 - 0.06 |
Applications
Oil & Gas Transmission Pipelines
As the core material for trunk pipelines, API 5L-B steel pipes are extensively used in onshore and subsea oil/gas transmission lines.
Chemical Engineering & Offshore Platforms
With resistance to H₂S corrosion, they serve as ideal materials for:
Chemical storage tanks
Structural components of offshore platforms
→ Significantly extends equipment service life.
Large-Diameter Welded Pipe Manufacturing
With advancing pipeline steel technology, API 5L-B is increasingly applied in large-diameter welded pipes-especially for high-pressure, long-distance transportation-leveraging its superior welding performance and formability advantages.
Test and inspection
Packaging and shipping
