API 5L X70 PSL1 and PSL2 line pipes are high-strength pipeline steel pipes that comply with the American Petroleum Institute (API) 5L standard, with a minimum yield strength of 485 MPa (approximately 70,300 psi). They are widely used in the long-distance, high-pressure transportation of oil, natural gas and other energy resources.
The main differences between these two types of pipes lie in their quality control levels and applicable operating conditions:
PSL1 (Product Specification Level 1)
As a basic quality grade, PSL1 is suitable for most conventional oil and gas transportation scenarios. It has relatively relaxed requirements for chemical composition, impact toughness and non-destructive testing, and features lower costs, making it ideal for use in non-severe onshore environments.
PSL2 (Product Specification Level 2)
As a more stringent high-grade standard, PSL2 is designed for harsh operating environments such as high-pressure, low-temperature, offshore or hydrogen sulfide (H₂S)-containing acidic conditions. PSL2 has stricter requirements in the following aspects:
More precise chemical composition control: Especially with stricter limits on carbon equivalent (Ceq) to ensure excellent weldability.
Mandatory impact testing: For example, the longitudinal impact energy at 0°C must be ≥41 J, and the transverse impact energy must be ≥27 J.
100% non-destructive testing per pipe: Including ultrasonic testing and radiographic testing to ensure no defects in the welds and pipe body.
Higher requirements for welded joint performance: Welded joints must match the strength of the base material to enhance overall structural safety.
In addition, X70 grade steel pipes can be produced as seamless pipes or welded pipes (such as LSAW and SSAW), with a wide outer diameter range (up to 1240 mm) and wall thickness ranging from 1 mm to 200 mm, meeting diverse engineering needs.
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API 5L X70 Pipe Specifications
| Item | Specification |
|---|---|
| Standard | API SPEC 5L, GB/T 9711, ISO 3183 |
| Grade Definition | "X" stands for pipeline steel, "70" indicates a minimum yield strength of 70 ksi (approximately 485 MPa) |
| Product Specification Level | PSL1 (Basic Level), PSL2 (Strict Level) |
| Pipe Type | Seamless, Longitudinal Submerged Arc Welded (LSAW/ERW), Spiral Submerged Arc Welded (SSAW) |
| Outer Diameter Range | 8–1240 mm (approx. 0.3–48 inches) |
| Wall Thickness Range | 1–200 mm, supporting various schedules from SCH5s to XXS |
| Length | Fixed lengths: 5.8m, 6m, 11.8m, 12m; custom lengths available |
API 5L X70 pipeline for oil and gas Mechanical Properties (Min/Max Requirements)
Note: PSL2 has a mandatory maximum limit for yield strength to ensure weldability and safety.
| Item | PSL1 (Basic Level) | PSL2 (Strict Level) | Notes |
|---|---|---|---|
| Minimum Yield Strength (Rt₀.₅) | 485 MPa | 485 MPa | "X70" denotes a minimum yield strength of 70 ksi (~485 MPa) |
| Tensile Strength (Rm) | 570–760 MPa | 570–760 MPa | Ensures load-bearing capacity under high stress |
| Elongation (A) | ≥18% | ≥18% | Measures ductility and resistance to brittle fracture |
| Charpy V-notch Impact Energy | <ul><li>0°C: ≥41 J (longitudinal)</li><li>Transverse ≥27 J</li></ul> | <ul><li>-20°C: ≥40 J (longitudinal)</li><li>Transverse ≥27 J</li></ul> | PSL2 requires testing at lower temperatures to ensure low-temperature toughness |
| Drop Weight Tear Test (DWTT) | Not mandatory | ≥75% shear area at -20°C | Evaluates crack arrest capability, critical for high-pressure gas pipelines |
| Hardness Control | ≤28 HRC | ≤22 HRC (in sour environments) | Prevents hydrogen-induced cracking (HIC) and sulfide stress corrosion cracking (SSC) |
| Carbon Equivalent (Ceq) | ≤0.43% | ≤0.38% | Limits weldability and crack sensitivity; stricter in PSL2 |
API 5L X70 Carbon Steel Line Pipe Chemical Composition (Max % for X70)
Values may vary slightly based on manufacturing type (Welded vs. Seamless).
| Element | Content (wt%) | Notes |
|---|---|---|
| Carbon (C) | ≤ 0.18% | Low carbon design improves weldability and toughness; lower limits (≤0.12%) apply for PSL2 or sour service conditions |
| Silicon (Si) | 0.10 – 0.45% | Solid solution strengthening, enhances strength and corrosion resistance |
| Manganese (Mn) | 1.30 – 1.75% | Improves hardenability and deformation resistance, enhances low-temperature toughness |
| Phosphorus (P) | ≤ 0.020% | Strictly controlled impurity to reduce brittleness risk |
| Sulfur (S) | ≤ 0.010% | Reduces hot cracking tendency, improves hydrogen-induced cracking (HIC) resistance |
| Niobium (Nb) | 0.03 – 0.08% | Grain refinement, increases strength and low-temperature toughness |
| Vanadium (V) | 0.01 – 0.10% | Precipitation strengthening, improves overall mechanical properties |
| Titanium (Ti) | 0.010 – 0.06% | Fixes nitrogen, promotes microstructural uniformity |
| Aluminum (Alt) | ≥ 0.020% | Deoxidizer, improves steel cleanliness |
| Copper (Cu), Nickel (Ni), Chromium (Cr) | ≤ 0.35% each | Optional additions to further enhance corrosion resistance and strength |
API 5L X70 Pipe Dimensions (Seamless & Welded)
| NPS (in) | OD (mm) | WT (mm) - SCH/STD/XS |
|---|---|---|
| 1/2 | 21.3 | 2.77 (SCH 40), 3.73 (XS) |
| 3/4 | 26.7 | 2.87 (SCH 40), 3.91 (XS) |
| 1 | 33.4 | 3.38 (SCH 40), 4.55 (XS) |
| 1-1/4 | 42.2 | 3.56 (SCH 40), 4.85 (XS) |
| 1-1/2 | 48.3 | 3.68 (SCH 40), 5.08 (XS) |
| 2 | 60.3 | 3.91 (SCH 40), 5.54 (XS) |
| 2-1/2 | 73.0 | 5.16 (SCH 40), 7.01 (XS) |
| 3 | 88.9 | 5.49 (SCH 40), 7.62 (XS) |
| 4 | 114.3 | 6.02 (SCH 40), 8.56 (XS) |
| 6 | 168.3 | 7.11 (SCH 40), 9.53 (XS), 12.70 (XXS) |
| 8 | 219.1 | 8.18 (SCH 40), 10.97 (XS), 14.30 (XXS) |
| 10 | 273.1 | 9.27 (SCH 40), 12.70 (XS), 16.46 (XXS) |
| 12 | 323.9 | 9.53 (SCH 40), 12.70 (XS), 17.48 (XXS) |
| 14 | 355.6 | 9.53 (SCH 30), 12.70 (SCH 40) |
| 16 | 406.4 | 9.53 (SCH 30), 12.70 (SCH 40) |
| 18 | 457.2 | 9.53 (SCH 30), 12.70 (SCH 40) |
| 20 | 508.0 | 9.53 (SCH 30), 12.70 (SCH 40) |
| 24 | 609.6 | 9.53 (SCH 30), 12.70 (SCH 40), 15.88 (SCH 60) |
| 30 | 762.0 | 12.70, 15.88, 19.05 |
| 36 | 914.4 | 12.70, 15.88, 19.05, 22.23 |
| 42 | 1066.8 | 12.70, 15.88, 19.05, 25.40 |
| 48 | 1219.2 | 12.70, 15.88, 19.05, 25.40, 30.00 |
API 5L X70 test equipments
API 5L X70 Oil and Gas pipeline factory
API 5L X70 Oil and gas pipe lines Packaging and Shipping
FAQ
What is API 5L X70 equivalent ASTM?
Based on international project practices, X70 typically corresponds to L485 (EN 10208-2) under European standards, whereas no equivalent grade is defined within the ASTM system.
What is the hardness of X70?
The hardness of X70 pipeline steel is typically controlled within the range of ≤230 HV (Vickers hardness) or 22–28 HRC (Rockwell hardness).
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