X52N (L360N) Pipeline Steel Coil per GB/T14164-2013
X52N (L360N) Pipeline Steel Coil per GB/T14164-2013: Full Data & Equivalents
Comprehensive technical analysis of X52N (L360N) steel coil according to GB/T14164-2013 standard, covering chemical composition, mechanical and thermal properties, international equivalents, similar grades, and application guidelines.
Welding, bending, cold forming, machining
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X52N Pipeline Steel Coil per GB/T14164-2013 Introduction
X52N (L360N) is a normalised or normalising rolled pipeline steel grade specified in GB/T14164-2013 (Petroleum and natural gas industries — Steel pipe for pipeline transportation systems). It belongs to PSL 2 (product specification level 2) with enhanced requirements. Key features include:
- Minimum yield strength 360 MPa
- Good notch toughness suitable for low-temperature service
- Normalised delivery condition ensures uniform microstructure
- Widely used for oil and gas transmission pipelines, structural and pressure applications
X52N Pipeline Steel Coil per GB/T14164-2013 Chemical Composition
The steel is fully killed and fine grained. Unless otherwise stated, the values are maximum permissible. Carbon equivalent CEPcm is controlled to ensure weldability. Al/N ratio must be ≥2:1 for fine grain practice. Detailed limits are provided below.
| Element | Standard Value (wt%) | Remarks |
|---|---|---|
| C | ≤ 0.22 | Carbon content for X52N |
| Si | ≤ 0.45 | Silicon |
| Mn | ≤ 1.40 | Manganese |
| P | ≤ 0.025 | Phosphorus |
| S | ≤ 0.015 | Sulfur |
| V+Nb+Ti | ≤ 0.15 | Sum of microalloying elements |
| Al (total) | ≥ 0.015 | Required for grain refinement |
| N | ≤ 0.012 | Nitrogen |
| CEPcm | ≤ 0.25 | Carbon equivalent (Pcm = C+Si/30+(Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B) |
| Cu | ≤ 0.35 | Residual element |
| Ni | ≤ 0.30 | Residual element |
| Cr | ≤ 0.30 | Residual element |
| Mo | ≤ 0.12 | Residual element |
X52N Pipeline Steel Coil per GB/T14164-2013 Thermal and Electrical Physical Properties
The physical properties provided are typical for low-carbon pipeline steels like X52N. Actual values may vary with slight composition changes and temperature. These data are useful for heat transfer and thermal stress calculations.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | Room temperature |
| Elastic Modulus (E) | 205 | GPa | Room temperature |
| Shear Modulus (G) | 79.3 | GPa | Calculated from E and ν |
| Poisson's Ratio (ν) | 0.29 | – | Room temperature |
| Thermal Expansion Coefficient (α) | 11.7 × 10⁻⁶ | /K | 20 – 100 °C |
| Thermal Conductivity (λ) | 51.9 | W/(m·K) | At 20 °C |
| Specific Heat Capacity (c) | 486 | J/(kg·K) | At 20 °C |
| Electrical Resistivity (ρ_e) | 0.15 × 10⁻⁶ | Ω·m | At 20 °C |
X52N Pipeline Steel Coil per GB/T14164-2013 Mechanical Properties
Tensile testing is performed on transverse specimens. Charpy V-notch impact tests are conducted at the specified temperature for PSL2 service. Bending test is a crack-free 180° bend. All values are minimum unless a range is indicated.
- Yield strength (Rt0.5): 360 – 530 MPa
- Tensile strength (Rm): 460 – 760 MPa
- Impact energy: ≥ 27 J average at 0 °C (full-size specimen)
| Property | Standard Required Value | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (Rt0.5) | 360 – 530 | MPa | Transverse, room temperature |
| Tensile Strength (Rm) | 460 – 760 | MPa | Transverse, room temperature |
| Elongation after fracture (A) | ≥ 21 (typical for ≤ 25 mm wall) | % | Transverse, gauge length 50 mm or 5.65√So |
| Charpy V-notch Impact (KV2) | Average ≥ 27, Single ≥ 20 | J | Transverse, 0 °C, full-size specimen 10×10 mm |
| Bend Test (180°) | No cracks | – | Mandrel diameter = wall thickness (t ≤ 12.7 mm); for t >12.7 mm, mandrel = 1.5 t per agreement |
| Hardness (max) | ≤ 250 HV10 or ≤ 22 HRC | – | Reference; not mandatory for all products |
X52N Pipeline Steel Coil per GB/T14164-2013 Fully Equivalent Standards & Substitute Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| International | ISO 3183:2012 | L360N (PSL2) | Identical requirements |
| USA | API 5L 46th Ed. | X52N (PSL2) | Identical to GB/T14164 X52N |
| European Union | EN 10208-2 | L360NB | Normalised for combustible fluids |
| Russia/CIS | GOST R 52079 | K52 | Closest equivalent, check supplementary requirements |
| Brazil | ABNT NBR 15389 | X52N | Based on API 5L |
X52N Pipeline Steel Coil per GB/T14164-2013 Application Introduction
X52N (L360N) steel coil is primarily intended for the manufacture of longitudinal or spiral welded pipes used in oil and gas transmission systems. Its balanced composition and normalised microstructure provide good toughness at low temperatures, making it suitable for onshore and offshore pipelines. It can also be used for structural applications where yield strength ≥ 360 MPa is required.
Product Applications: Longitudinally welded (SAWL/HFW) pipes, Spiral submerged arc welded (SSAW) pipes, Seamless pipes (by third parties), Pipe piles and structural tubes, Fittings and flanges for pipeline systems
Processed into products: Pipe elbows (5D, 3D, hot induction bends), Reducers and tees, Weld-on flanges (WN, SO) and blind flanges, Anchor flanges and pup pieces, Closures and pressure vessel shells (limited)
Application industries: Oil & Gas (upstream and midstream), Petrochemical, Water & Slurry Transportation, Civil & Marine Engineering, Boiler & Pressure Vessels (with agreement)
X52N Pipeline Steel Coil per GB/T14164-2013 Similar/Alternative Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| International | ISO 3183 | L360M (X52M) | Thermomechanically rolled; similar strength, lower carbon equivalent |
| USA | API 5L | X52M PSL2 | Often used as a substitute with better formability |
| European Union | EN 10025-3 | S355N/NL | Normalised structural steel; similar yield strength, not for pipeline use |
| China | GB/T 1591 | Q345D | Structural steel; close strength and -20°C impact, different standard |
| India | IS 2062 | E350BR | Comparable tensile properties, need to check pipeline specifications |
Notes:
For sour service applications, additional testing such as HIC (Hydrogen Induced Cracking) and SSC (Sulfide Stress Cracking) may be required. This grade is not intended for severe sour conditions unless supplementary requirements are met. Normalised delivery condition must be clearly specified in the order. Always refer to the latest edition of GB/T14164 and project specifications for precise limits.
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