API 5L PSL2 X52N (L360N) Pipeline Steel Coil
API 5L PSL2 X52N (L360N) Pipeline Steel Coil - Properties, Equivalents & Applications
Explore API 5L PSL2 X52N (L360N) pipeline steel coil: chemical composition, mechanical properties, thermal and electrical data, equivalent grades (ISO 3183, GB/T 9711), and typical applications in oil and gas transmission.
Normalizing rolling, normalizing, pipe forming (SAW, ERW, seamless), welding
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API 5L PSL2 X52N Pipeline Steel Coil Introduction
API 5L PSL2 X52N (L360N) is a high-strength, low-alloy pipeline steel supplied in normalized or normalized-rolled condition. It is primarily designed for welded line pipe used in conveying oil, gas, and water. With a minimum yield strength of 360 MPa (52 ksi), this grade offers improved toughness and formability compared to standard X52, thanks to the normalized microstructure. PSL2 imposes stricter requirements on chemical composition, mechanical testing (including mandatory notch toughness), and non-destructive inspection, making it suitable for critical service and sour environments when ordered with appropriate supplementary requirements.
API 5L PSL2 X52N Pipeline Steel Coil Chemical Composition
The chemical composition of API 5L PSL2 X52N is controlled to ensure weldability and mechanical properties. Typical limits based on API 5L 46th Edition for PSL2 pipe with t ≤ 25 mm are shown. Elements like V+Nb+Ti may be added for grain refinement. Carbon equivalent (CEIIW or CEPcm) is strictly limited.
| Element | Typical/Max Value (wt%) | Remarks |
|---|---|---|
| C | 0.16 max | Heat analysis; lower for thinner gauge |
| Si | 0.45 max | Heat analysis |
| Mn | 1.65 max | Heat analysis |
| P | 0.020 max | PSL2 limit |
| S | 0.010 max | PSL2 limit |
| V | 0.07 max | May be added |
| Nb | 0.05 max | May be added |
| Ti | 0.04 max | May be added |
| Al (total) | 0.015–0.060 | Typical total Al for fine grain |
| N | 0.012 max | Heat analysis |
| Cu | 0.50 max | Residual element |
| Ni | 0.50 max | Residual element |
| Cr | 0.50 max | Residual element |
| Mo | 0.15 max | Residual element |
| CEIIW | 0.43 max | Typical for PSL2; may vary with product analysis |
API 5L PSL2 X52N Pipeline Steel Coil Thermal and Electrical Physical Properties
These physical properties are typical for normalized C-Mn pipeline steel. They are not mandatory requirements of API 5L but are useful for design calculations. Values are for room temperature unless noted.
| Property | Typical Value | Unit | Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | at 20°C |
| Elastic modulus (E) | 210 | GPa | Tensile modulus, at 20°C |
| Shear modulus (G) | 80 | GPa | at 20°C |
| Poisson's ratio (ν) | 0.3 | — | at 20°C |
| Thermal expansion coefficient (α) | 11.7 × 10⁻⁶ | 1/K | 20°C – 100°C |
| Thermal expansion coefficient (α) | 12.5 × 10⁻⁶ | 1/K | 20°C – 300°C |
| Thermal conductivity (λ) | 50 | W/(m·K) | at 20°C |
| Thermal conductivity (λ) | 47 | W/(m·K) | at 100°C |
| Specific heat capacity (c) | 460 | J/(kg·K) | at 20°C |
| Electrical resistivity (ρₑ) | 0.18 × 10⁻⁶ | Ω·m | at 20°C |
API 5L PSL2 X52N Pipeline Steel Coil Mechanical Properties
Mechanical properties are obtained from transverse strip specimens according to API 5L. PSL2 requires mandatory Charpy V-notch testing at 0°C or lower. Values below are minimum requirements unless indicated otherwise.
| Property | Required Value | Unit | Test Condition |
|---|---|---|---|
| Yield strength (ReH / Rt0.5) | 360 – 530 | MPa | Transverse strip, 0.2% offset |
| Tensile strength (Rm) | 460 – 760 | MPa | Transverse strip |
| Total elongation (A50) | ≥ 24 | % | Gauge length 50 mm, transverse strip |
| Elongation (A200) | ≥ 18 | % | Alternative gauge length 200 mm |
| Yield-to-tensile ratio (ReH/Rm) | ≤ 0.93 | — | For sour service as per PSL2 Table 12 |
| Bend test (180°) | bend diameter 2 t | — | Based on wall thickness t |
| Charpy V-notch KV (full-size) | ≥ 27 (average) / ≥ 20 (single) | J | at 0°C, transverse, full-size 10×10 mm |
| Charpy V-notch KV (sub-size) | As per ratio (see standard) | J | at 0°C, transverse, if wall thickness < 10 mm |
| Hardness (HRC/Vickers HV10) | ≤ 22 HRC / ≤ 250 HV | — | For sour service; otherwise not mandatory |
API 5L PSL2 X52N Pipeline Steel Coil Fully Equivalent Material Standards and Replaceable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| International | ISO 3183 | L360N | Identical technical delivery conditions |
| China | GB/T 9711 | L360N | PSL2 equivalent |
| European Union | EN 10208-2 | L360NB | Normalized type, similar requirements |
| Russia/CIS | GOST R 52079 | К52 (K52) | Equivalent strength class |
| India | IS 1239 Pt.2 / IS 3589 | X52 L360 | Comparable grade |
API 5L PSL2 X52N Pipeline Steel Coil Application Introduction
API 5L PSL2 X52N (L360N) is used extensively in the oil and gas industry for high-pressure transmission pipelines, particularly where enhanced resistance to brittle fracture and improved weldability are required. It can be fabricated into line pipe, fittings, and flanges. Typical products and components include:
Product Applications: Long-distance oil and gas pipelines, Offshore risers and flowlines, Storage tank shell plates, Structural hollow sections, Steel pipe piles
Processed into products: DSAW/SAWL/SAWH line pipes, ERW/HFI line pipes, Seamless line pipes (if manufactured from equivalent steel), Bends and elbows, Reducers and tees, Flanges and fittings
Application industries: Oil and gas exploration & production, Pipeline infrastructure (onshore and offshore), Petrochemical plants, Water treatment & transmission, Construction and structural engineering
API 5L PSL2 X52N Pipeline Steel Coil Similar/Alternative Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| United States | API 5L PSL2 | X52 (L360) | Without normalizing requirement; may be TMCP or as-rolled |
| International | ISO 3183 | L360M | Thermo-mechanically controlled processed (TMCP) variant |
| European Union | EN 10208-2 | L360MB | TMCP variant with similar strength |
| China | GB/T 9711 | L360 | No stated delivery condition unless specified |
| Japan | JIS G 3454 / JIS G 3456 | SCPL360 | Carbon steel pipes for pressure and high-temperature service; similar yield strength |
Notes:
- For sour service applications (H₂S-containing environments), supplementary requirements such as HIC and SSC testing per NACE MR0175/ISO 15156 apply.
- PSL2 includes mandatory NDT requirements including ultrasonic inspection for plates/coils used in pipe manufacturing.
- Carbon equivalent CEIIW = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15, and CEPcm = C + Si/30 + (Mn+Cu+Cr)/20 + Ni/60 + Mo/15 + V/10 + 5B, both are controlled for weldability.
- Pipe dimensional tolerances and coating requirements depend on the end-use service condition.
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