API 5L is the international standard for seamless and welded steel pipes used in oil and gas pipelines. It specifies two product specification levels: PSL1 (standard quality) and PSL2 (higher quality with stricter testing). The most common grades range from L245/B to L485/X70. These pipes are essential for transporting petroleum, natural gas, and water in the energy industry.
Chemical Composition (Max %) for PSL2
Typical maximum chemical composition (% by mass) per API 5L PSL2.
| Grade | C (%) | Mn (%) | P (%) | S (%) | Equivalent |
|---|---|---|---|---|---|
| L245 / B | ≤0.26 | ≤1.20 | ≤0.030 | ≤0.030 | Low Carbon |
| L290 / X42 | ≤0.26 | ≤1.30 | ≤0.030 | ≤0.030 | Micro-alloyed |
| L360 / X52 | ≤0.26 | ≤1.40 | ≤0.030 | ≤0.030 | Micro-alloyed |
| L415 / X60 | ≤0.22 | ≤1.45 | ≤0.025 | ≤0.015 | HSLA |
| L450 / X65 | ≤0.22 | ≤1.60 | ≤0.025 | ≤0.015 | HSLA |
| L485 / X70 | ≤0.22 | ≤1.65 | ≤0.025 | ≤0.015 | HSLA |
Note: PSL2 requires stricter chemical limits, mandatory impact testing, and NDT (Non-Destructive Testing). Micro-alloying elements like Nb, V, and Ti are often added to higher grades (X60 and above) to achieve the required strength and toughness.
Mechanical Properties (PSL2)
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Impact Test |
|---|---|---|---|---|
| L245 / B | 245–450 | 415–760 | ≥21 | Required |
| L290 / X42 | 290–495 | 415–760 | ≥21 | Required |
| L360 / X52 | 360–530 | 460–760 | ≥21 | Required |
| L415 / X60 | 415–565 | 520–760 | ≥21 | Required |
| L450 / X65 | 450–600 | 535–760 | ≥21 | Required |
| L485 / X70 | 485–635 | 570–760 | ≥21 | Required |
Available Sizes & Delivery
| Outer Diameter (OD) | 21.3–1420 mm |
| Wall Thickness (WT) | 2.0–50 mm |
| Length | Up to 12m (random or fixed length) |
| Pipe Types | Seamless (SMLS), ERW, LSAW, SSAW |
| Standard | API 5L (PSL1 / PSL2) / ISO 3183 |
| Mill Test Certificate | EN 10204 3.1 with every shipment |
| MOQ | 10 Tons |
| Delivery Time | Within 15-25 days (≤1000 tons) |
Why Order from Zhongtang Steel?
- Full API 5L Range — PSL1 and PSL2 from L245/B to L485/X70
- Strict Quality Control — Hydrostatic testing, NDT, and impact testing
- EN 10204 3.1 MTC supplied with every shipment
- ISO 9001 certified manufacturer since 1998
- Mill-direct pricing — no trading company markup
Applications
- Oil and gas transmission pipelines
- Water supply and sewage systems
- Petrochemical and refinery piping
- Offshore and onshore drilling operations
- High-pressure boiler and heat exchanger tubes
- Structural and piling applications
Values are typical reference ranges per API 5L. Actual properties may vary by pipe type (SMLS, ERW, LSAW) and production route. Mill test certificates (EN 10204 3.1) are supplied with every shipment — contact us for exact data sheets.
