X52 PSL2 is one of the most widely specified pipeline steel grades in the oil and gas industry. Under API 5L, the "X" designation represents line pipe steel, while "52" indicates a minimum yield strength of 52,000 psi (360 MPa). The metric equivalent designation is L360.
The PSL2 (Product Specification Level 2) designation means the pipe meets enhanced quality requirements, including mandatory Charpy V-notch impact testing, stricter chemical composition control, improved weldability, and complete traceability from steel heat to finished pipe.
GNEE Pipe supplies API 5L X52 PSL2 line pipe in seamless, ERW, LSAW, and SSAW production forms for oil and gas transmission projects worldwide. Contact our engineering team for project pricing and technical support.
Specifications
X52 PSL2 is manufactured according to API Specification 5L and can also be supplied with GB/T 9711 dual certification. The grade is available in different production forms to meet various pipeline requirements.
| Production Type | OD Range | Wall Thickness | Length |
|---|---|---|---|
| Seamless (SMLS) | 2" – 24" | SCH 20 – SCH XXS | 6 m / 12 m / DRL |
| LSAW (Longitudinal) | 18" – 56" | 6.35 – 50.0 mm | 11.8 – 12.0 m |
| ERW (Welded) | 8" – 24" | 4.0 – 15.0 mm | Up to 12.5 m |
| SSAW (Spiral) | 24" – 100" | 6.0 – 30.0 mm | Up to 18 m |
Note: DRL means Double Random Length. Specific size availability should be confirmed according to production capability and stock status.
Chemical Composition and Carbon Equivalent
API 5L X52 PSL2 has stricter chemical control compared with PSL1 to ensure better toughness, weldability, and resistance to pipeline cracking.
- Maximum sulfur content: 0.015%
- Maximum phosphorus content: 0.025%
- Maximum CEIIW carbon equivalent: 0.43%
Compared with PSL1, which allows sulfur and phosphorus up to 0.030% each, PSL2 significantly reduces impurity levels and improves resistance to hydrogen-induced cracking (HIC).
Chemical limits vary depending on delivery condition:
- X52N: Normalized condition, carbon up to 0.24%
- X52M: Thermomechanically rolled condition, carbon up to 0.22%
- X52Q: Quenched and tempered condition, carbon up to 0.18%
Mechanical Properties
| Property | X52 PSL2 Requirement |
|---|---|
| Minimum Yield Strength | 360 MPa (52,000 psi) |
| Maximum Yield Strength | 530 MPa (77,000 psi) |
| Minimum Tensile Strength | 460 MPa (66,700 psi) |
| Maximum Tensile Strength | 760 MPa (110,200 psi) |
| Yield-to-Tensile Ratio | ≤ 0.93 (OD > 323.9 mm / 12.75") |
| Maximum Hardness | 250 HV10 (248 HV10 for sour service) |
| Charpy V-Notch Impact Test | Mandatory; minimum average energy depends on pipe size |
Impact testing requirements depend on pipe diameter and project specifications. Typical values include 27 J for OD ≤ 20" and 40 J for OD > 20".
PSL1 vs PSL2: Main Differences
| Feature | PSL1 | PSL2 |
|---|---|---|
| Minimum Yield Strength | 360 MPa | 360 MPa |
| Maximum Yield Strength | Not specified | 530 MPa |
| Impact Testing | Not required | Mandatory Charpy V-notch testing |
| Carbon Equivalent | Not required | ≤ 0.43% |
| Sulfur / Phosphorus | 0.030% / 0.030% | 0.015% / 0.025% |
| Traceability | Basic batch-level | Full heat-to-pipe traceability |
| NDT Inspection | Basic / sampling | 100% full-body UT or RT |
| Repair Welding | Allowed by agreement | Not permitted on pipe body |
Test and Inspection Requirements
Every API 5L X52 PSL2 pipe undergoes strict inspection procedures to ensure pipeline reliability and safety.
- 100% full-body ultrasonic testing (UT) or radiographic testing (RT)
- Mandatory Charpy V-notch impact testing
- Hydrostatic pressure testing at the mill
- Dimensional inspection and surface examination
- Heat number traceability and MTC documentation
For critical applications, additional tests may include:
- Drop Weight Tear Test (DWTT)
- Hardness testing for sour service
- HIC testing for H₂S-containing environments
- NACE MR0175 / ISO 15156 compliance evaluation
Each pipe can be supplied with EN 10204 Type 3.1 Mill Test Certificate, including chemical analysis, mechanical test results, inspection records, and dimensional reports.
Don't Risk Project Failure! Our PSL2 pipes undergo 100% ultrasonic testing and Charpy V-notch impact tests. Ensure your pipeline stands the test of time. Download Our PSL2 Compliance Checklist
Surface Treatment and Coating Options
- 3PE / 3LPE Coating: The most common external coating for buried pipelines. Provides excellent corrosion protection and mechanical resistance. Suitable for temperatures from -40°C to 85°C.
- FBE Coating: Fusion bonded epoxy coating with strong adhesion and chemical resistance. Operating temperature up to approximately 110°C.
- 3LPP Coating: Three-layer polypropylene coating designed for higher-temperature applications, suitable up to approximately 140°C.
- Internal Epoxy Lining: Reduces friction, improves flow efficiency, and protects against internal corrosion.
- Black Varnish / Anti-Rust Oil: Provides temporary corrosion protection during storage and transportation.
Packaging and Shipping
GNEE Pipe provides professional packaging solutions to protect API 5L X52 PSL2 pipes during international transportation.
- Small diameter pipes are bundled with steel straps and separated by spacers.
- Large diameter pipes are shipped loose with heavy-duty end protectors.
- Container shipping is suitable for standard pipe lengths up to 12 m.
- Breakbulk shipping is available for oversized pipes and large projects.
Common delivery ports include Santos, Buenos Aires, Callao, Valparaiso, and Cartagena. CFR pricing is available for major international destinations.
FAQ
Is X52 the same as L360?
Yes. X52 and L360 refer to the same API 5L grade. X52 represents the minimum yield strength in ksi, while L360 represents the equivalent value in MPa.
Why choose PSL2 instead of PSL1?
PSL2 provides higher quality assurance through mandatory impact testing, stricter chemical control, carbon equivalent limits, full traceability, and 100% non-destructive testing.
What is the difference between X52N, X52M, and X52Q?
The suffix indicates delivery condition. X52N is normalized, X52M is thermomechanically controlled rolled, and X52Q is quenched and tempered. X52M is widely used because it provides excellent toughness and weldability.
Can X52 PSL2 be used for sour service?
Yes, but additional requirements must be specified, including HIC testing, hardness control, and NACE MR0175 / ISO 15156 compliance.
Procurement Checklist
When requesting a quotation for API 5L X52 PSL2 pipe, please provide:
- Grade and PSL level: API 5L X52 PSL2 / L360 PSL2
- Delivery condition: N, M, or Q
- Production type: Seamless, ERW, LSAW, or SSAW
- Outside diameter, wall thickness, and length
- End finish requirements
- Impact test temperature
- Coating requirements
- Required quantity
- Destination port
- Additional requirements such as sour service, DWTT, or third-party inspection
References
- API Specification 5L - Specification for Line Pipe
- GB/T 9711 - Steel Pipe for Pipeline Transportation Systems
- ISO 3183 - Petroleum and Natural Gas Industries - Steel Pipe for Pipeline Transportation Systems
- ASME B36.10M - Welded and Seamless Wrought Steel Pipe
- EN 10204 - Metallic Products: Types of Inspection Documents
- NACE MR0175 / ISO 15156 - Materials for H₂S-containing Environments
Request a Quotation
Send your API 5L X52 PSL2 pipe specifications to our engineering team. We will confirm availability, technical requirements, pricing, and delivery schedule within 24 hours.
For international pipeline projects, we provide competitive CFR solutions to major ports worldwide.
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