API 5L X60QS PSL2 Seamless Pipe
API 5L X60QS PSL2 Seamless Pipe is a high-strength, corrosion-resistant seamless steel pipe specifically designed for harsh service environments, widely used in the transportation systems of sour (H₂S-containing) oil and gas fields.
【 API 5L X60QS PSL2 seamless pipe 】 High pressure and corrosion-resistant! Oil and gas transportation/chemical special, complete specifications can be customized, click to get exclusive quotation!
Suffix Letter Meaning: What Does X60QS Stand For?
X: Stands for "Line Pipe", the general designation for pipeline steel under API standards.
60: Indicates the minimum yield strength of 60 ksi (approximately 415 MPa).
Q: In the API 5L system, "Q" denotes compliance with PSL2 additional requirements, often associated with enhanced quality control and heat treatment (Quenched and Tempered in some contexts).
S: Specifically refers to Sour Service Resistance, meaning the material is suitable for environments containing H₂S, with resistance to sulfide stress cracking (SSC) and hydrogen-induced cracking (HIC).
PSL2: Product Specification Level 2, which imposes stricter requirements on chemical composition, mechanical properties, and non-destructive testing compared to PSL1, especially for high-risk applications.
API 5L X60QS PSL2 Seamless Pipe Specification
| Item | Parameter |
|---|---|
| Standard | API SPEC 5L (46th Edition) |
| Grade | X60QS |
| Product Specification Level | PSL2 |
| Pipe Type | Seamless |
| Applicable Appendix | API 5L Appendix H (Supplementary Requirements for Sour Service) |
| Certification Standard | NACE MR0175 / ISO 15156 (Resistance to Sulfide Stress Cracking) |
API 5L X60QS PSL2 Line Pipes for oil & gas Mechanical Strength Requirements
| Property | Requirement | Test Standard |
|---|---|---|
| Yield Strength (YS) | ≥ 415 MPa | API 5L |
| Tensile Strength (TS) | 520–650 MPa | API 5L |
| Elongation (A) | ≥ 20% | API 5L |
| Impact Energy (KV₂) | ≥ 40 J @ -20°C | API 5L Appendix H |
| Hardness (HB) | ≤ 220 HB | NACE MR0175 (to prevent SSC) |
API 5L X60QS PSL2 seamless carbon steel line pipe Chemical Composition Requirements
| Element | Max Content (%) | Key Role |
|---|---|---|
| Carbon (C) | ≤ 0.16 | Controls strength while avoiding brittleness |
| Manganese (Mn) | 1.40–1.65 | Enhances strength, toughness, and weldability |
| Phosphorus (P) | ≤ 0.020 | Harmful element; strictly limited to improve corrosion resistance |
| Sulfur (S) | ≤ 0.003 | Critical control point; low sulfur improves HIC resistance |
| Silicon (Si) | 0.15–0.45 | Deoxidizer, improves purity |
| Niobium+Vanadium+Titanium (Nb+V+Ti) | ≤ 0.15 | Grain refinement, enhances sour resistance and weld performance |
API 5L X60QS PSL2 Oil and gas pipe lines Operating Temperature Range
| Parameter | Temperature Range |
|---|---|
| Normal Operating Range | -10°C to +150°C |
| Low-Temperature Impact Guarantee | ≥40 J @ -20°C (KV₂) |
| Short-Term Maximum | ≤ 200°C (to avoid temper softening) |
| Not Recommended For | Prolonged exposure >200°C or < -30°C |
Available Dimensions of API 5L X60QS PSL2 Pipe
| Outer Diameter (OD) | Typical Wall Thickness (WT) Range | Common Applications |
|---|---|---|
| 21.3 mm – 114.3 mm | 2.0 mm – 12.7 mm | Downhole tubing, instrument lines, refinery internal piping |
| 114.3 mm – 508 mm | 8.0 mm – 40.0 mm | Onshore gathering systems, long-distance transmission pipelines |
| 508 mm – 1067 mm | 12.7 mm – 150 mm | Major gas trunklines, subsea pipelines, high-flow transmission projects |
API 5L X60QS PSL2 High Yield Carbon Steel Pipes Applications
X60QS PSL2 seamless pipes are primarily used in highly corrosive industrial environments, including:
Gathering and transmission pipelines in sour gas/oil fields (onshore and offshore platforms)
Refinery and chemical plant piping systems handling acidic media (H₂S, CO₂)
Long-distance natural gas pipelines passing through high-sulfur zones
Subsea pipeline systems (with controlled hardness for marine service)
Connection systems in ultra-deep wells (as auxiliary tubing/casing)
API 5L X60QS PSL2 Carbon Steel Line Pipe Manufacturing Process
X60QS PSL2 seamless pipes are manufactured through a fully controlled precision process:
Raw Material Preparation: High-purity continuous casting billets with strict control of residual elements.
Heating & Piercing: Heated to high temperature and pierced via skew rolling to form a hollow shell.
Tube Rolling: Processed using continuous or periodic rolling mills to achieve uniform wall thickness.
Heat Treatment: Fully normalized or quenched and tempered to refine grain structure and relieve stress.
Non-Destructive Testing (NDT): 100% ultrasonic, eddy current, and X-ray inspection per PSL2 mandatory requirements.
Sour Service Testing: Conducted HIC and SSC tests to meet NACE MR0175 certification.
Final Inspection & Marking: Each pipe is numbered, labeled, and packaged to prevent damage.
API 5L X60QS PSL2 Oil and gas pipe lines Delivery Conditions
Heat Treatment State: Normalized (N) or Quenched & Tempered (Q)
Surface Finish: As-rolled (black), sandblasted, or coated (e.g., 3PE anti-corrosion)
End Preparation: Plain end or beveled end (for welding compatibility)
Packaging: Bundled and secured to prevent moisture and mechanical damage
Documentation: Supplied with MTC (Material Test Certificate), NACE certification, HIC/SSC test reports
API 5L Pipeline test and inspection
API 5L HIC Pipeline factory
FAQ
What is the strength of X60 steel?
The minimum yield strength of API 5L X60 steel is 415 MPa (60000 psi), making it a widely used medium to high strength pipeline steel in oil and gas long-distance pipelines.
What is the difference between API 5L X60 and X65?
The main difference between API 5L X60 and X65 lies in strength grade and applicable working conditions: X60 has a minimum yield strength of 415 MPa (60000 psi), while X65 has a minimum yield strength of 450 MPa (65000 psi). X65 has higher strength and is suitable for oil and gas transportation projects with higher pressure and more complex geological conditions.
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