API 5L X65 seamless steel pipes range in outer diameter from 21.3mm to 1026mm, while welded pipes range in outer diameter from 457mm to 1524mm, with wall thicknesses from 2.0mm to 120mm. Specific dimensions can be customized to project requirements.
API 5L X65 is a high-grade pipeline steel pipe standard from the American Petroleum Institute (API). "X65" indicates its minimum yield strength of 65 ksi (approximately 448 MPa). It is widely used in long-distance oil and gas pipelines and high-pressure gathering and transmission systems. These steel pipes offer high dimensional adjustability to meet the pressure, flow rate, and environmental requirements under different operating conditions.
API 5L X65 Pipe Dimensions & Weight Table (NPS 2" - 36")
| Nominal Pipe Size (NPS) | OD (Inches) | OD (mm) | Wall Thickness Schedule (Sch.) | Wall Thickness (WT - mm) | Theoretical Weight ( kg/m ) |
| 2" | 2.375 | 60.3 | Sch 40 (STD) | 3.91 | 5.44 |
| Sch 80 (XS) | 5.54 | 7.48 | |||
| 4" | 4.500 | 114.3 | Sch 40 (STD) | 6.02 | 16.07 |
| Sch 80 (XS) | 8.56 | 22.32 | |||
| 6" | 6.625 | 168.3 | Sch 40 (STD) | 7.11 | 28.26 |
| Sch 80 (XS) | 10.97 | 42.56 | |||
| 8" | 8.625 | 219.1 | Sch 40 (STD) | 8.18 | 42.55 |
| Sch 80 (XS) | 12.70 | 64.64 | |||
| 12" | 12.750 | 323.8 | Sch STD | 9.53 | 73.86 |
| Sch 80 (XS) | 17.48 | 132.08 | |||
| 16" | 16.000 | 406.4 | Sch STD | 9.53 | 93.27 |
| Sch 80 (XS) | 21.44 | 203.53 | |||
| 24" | 24.000 | 609.6 | Sch STD | 9.53 | 141.02 |
| Sch XS | 12.70 | 186.97 | |||
| 30" | 30.000 | 762.0 | Sch STD | 9.53 | 176.85 |
| Sch XS | 12.70 | 234.61 | |||
| 36" | 36.000 | 914.4 | Sch STD | 9.53 | 212.69 |
| Sch XS | 12.70 | 282.26 |
From 2" to 60": Massive API 5L X65 PSL2 Inventory Ready for Immediate Global Shipping.
Typical Dimensional Tolerances (per API 5L)
| Measurement Item | Tolerance Range (Typical) |
| OD (Outer Diameter) - Pipe Body | ±0.75% |
| OD (Outer Diameter) - Pipe Ends | ±0.5% (or ±1.6mm, whichever is smaller) |
| WT (Wall Thickness) - Seamless | +15% / -12.5% |
| WT (Wall Thickness) - Welded | ±10% (or as per specific agreement) |
| Straightness | ≤ 0.2% of total length |
| Bevel (Pipe Ends) | Standard 30° (+5°, -0°), Root Face 1.6mm ± 0.8mm |
Charpy V-Notch (CVN) Impact Requirements
Applicable to PSL2 only. X65 PSL2 must pass impact tests at 0°C (or lower, as per design requirements) to evaluate toughness.
| Specimen Location | Orientation | Min. Average Energy (Full-size, 0°C) |
| Pipe Body | Transverse | ≥ 40 J (or calculated based on WT) |
| Pipe Body | Longitudinal | ≥ 60 J |
| Weld Seam | Transverse | ≥ 27 J |
Manufacturing Processes and Size Range
Seamless (SMLS): Common from NPS 2" to 24".
Electric Resistance Welded (ERW): Common from NPS 2" to 20".
Longitudinal Submerged Arc Welded (LSAW): Common from NPS 16" to 60" (The preferred choice for large-diameter, high-pressure lines).
Spiral Submerged Arc Welded (SSAW): Common from NPS 24" to 100".
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FAQ
What is the wall thickness of X65 pipe?
1 mm to 200 mm
X60/X65 line pipes cover outer diameters from 8 inches (203.2 mm) to 1240 mm and wall thicknesses from 1 mm to 200 mm. These pipes feature high strength, large diameter, and high reliability, making them suitable for long-distance and high-pressure transportation, ideal for the oil and gas industry.
What is the X65 pipe specification?
Decoding API 5L X65
Specifically, it indicates that the pipe has a minimum yield strength of 65,300 psi (pounds per square inch) or 450 MPa (megapascals). This high yield strength makes X65 grade pipe suitable for high-pressure applications.
What is the yield strength of X65 pipe?
Grade X65 indicates 65000 PSI minimum yield strength and 77000 PSI minimum ultimate tensile strength.
What is API 5L X65 material grade
API 5L Grade X65 or L450 PSL1 pipe is normal carbon steel material among the tree types and for common use, (None corrosion environment but in high pressure pipelines required a certain mechanical properties). so it has the highest content of C, Mn, Si, P, S than the other two types.