L360 (X52) Pipeline Steel Coil per GB/T14164-2013 PSL1
L360 (X52) Pipeline Steel Coil per GB/T14164-2013 PSL1 | Chemical & Mechanical Data
Detailed material data for L360 (X52) pipeline steel coil according to GB/T14164-2013 PSL1, including chemistry, mechanical and physical properties, international equivalents, and application guide.
Hot rolling with controlled rolling or thermo-mechanical controlled processing (TMCP); forming into spiral or longitudinal welded pipes
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L360 Pipeline Steel Coil per GB/T14164-2013 PSL1 Introduction
L360 (X52) PSL1 pipeline steel coil is a micro-alloyed, controlled-rolled steel designed for the manufacture of welded pipes used in oil and gas transmission. Conforming to GB/T14164-2013 (equivalent to API Spec 5L), this grade offers a minimum yield strength of 360 MPa and excellent weldability. PSL1 represents the basic quality level, suitable for moderately demanding transport conditions. The steel is typically supplied as hot-rolled coil and further processed into longitudinal or spiral submerged-arc welded pipes. Its balanced composition and fine-grained microstructure ensure reliable toughness and formability.
L360 Pipeline Steel Coil per GB/T14164-2013 PSL1 Chemical Composition
Chemical requirements for L360 (X52) PSL1 steel as per GB/T14164-2013. For PSL1, only C, Si, Mn, P, and S are specified with maximum limits. Alloying elements such as V, Nb, Ti, Cu, Ni, Cr, Mo are not mandatory but may be added at the manufacturer's discretion to achieve the required mechanical properties. Residual element limits, if adopted, follow common pipeline steel practice.
| Element | Standard Value (max, %) | Remarks |
|---|---|---|
| Carbon (C) | 0.28 | Max; for C < 0.12, Mn may be increased to 1.65% |
| Silicon (Si) | 0.45 | Max |
| Manganese (Mn) | 1.40 | Max, subject to C-Mn correlation |
| Phosphorus (P) | 0.030 | Max |
| Sulfur (S) | 0.030 | Max |
| Vanadium (V) | Not specified | Optional micro-alloy (commonly ≤0.10) |
| Niobium (Nb) | Not specified | Optional micro-alloy (commonly ≤0.05) |
| Titanium (Ti) | Not specified | Optional micro-alloy (commonly ≤0.04) |
| Copper (Cu) | Not specified | Residual element (typically ≤0.35) |
| Nickel (Ni) | Not specified | Residual element (typically ≤0.30) |
| Chromium (Cr) | Not specified | Residual element (typically ≤0.30) |
| Molybdenum (Mo) | Not specified | Residual element (typically ≤0.15) |
| Nitrogen (N) | Not specified | Residual element (typically ≤0.012) |
L360 Pipeline Steel Coil per GB/T14164-2013 PSL1 Thermal and Electrical Physical Properties
Representative physical properties for low-carbon micro-alloyed steel at room temperature, unless otherwise noted. These values are typical for L360 (X52) grade and can be used for design calculations and modeling. Actual values may slightly vary with exact composition and processing route.
| Property | Typical Value | Unit | Remarks |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20°C |
| Modulus of Elasticity (E) | 210 | GPa | Tensile; decreases slightly with temperature |
| Shear Modulus (G) | 81 | GPa | Calculated from E and Poisson's ratio |
| Poisson's Ratio (ν) | 0.30 | – | Elastic range |
| Thermal Expansion Coefficient (α) | 11.7 (20-100°C) | 10⁻⁶/K | Mean value; 12.5 at 100-200°C |
| Thermal Conductivity (λ) | 50 | W/(m·K) | At 20°C |
| Specific Heat Capacity | 480 | J/(kg·K) | At 20°C |
| Electrical Resistivity (ρ_e) | 0.18 | μΩ·m | At 20°C (≈ 18 μΩ·cm) |
L360 Pipeline Steel Coil per GB/T14164-2013 PSL1 Mechanical Properties
Tensile and toughness requirements are based on GB/T14164-2013 for PSL1 L360 pipe body. The values apply to the finished welded pipe made from the coil; coil mechanical properties are normally agreed upon between purchaser and supplier to ensure pipe conformance. Bend test dimension 'T' is the nominal wall thickness. Charpy impact tests are optional for PSL1; when specified, a common requirement is an average absorbed energy of at least 27 J at 0°C.
| Property | Standard Required Value | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH or Rt0.5) | Min 360 | MPa | Transverse strip, base metal |
| Tensile Strength (Rm) | 460 – 760 | MPa | Transverse strip, base metal |
| Elongation after fracture (A) | ≥ A = 1940 / Rm^0.2 or tabulated value | % | 50 mm gauge length (min typically 19-22%) |
| Bend Test (Mandrel Diameter) | No crack or opening | – | For t ≤ 12.7 mm: mandrel = 2T; t > 12.7 mm: mandrel = 3T (other thickness ranges available) |
| Charpy Impact Energy (KV) | ≥ 27 (average of 3) | J | At 0°C, transverse, full-size specimen (optional for PSL1) |
L360 Pipeline Steel Coil per GB/T14164-2013 PSL1 Exact International Equivalent Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| United States | API Spec 5L | PSL1 X52 | Identical PSL1 pipeline grade; L360 = X52 |
| International | ISO 3183 | L360 | Designation identical to GB/T; PSL 1 equivalent |
| European Union | EN 10208-2 | L360MB | For welded pipes; TMCP delivery, slightly different micro-alloy concepts but fully interchangeable |
| Canada | CSA Z245.1 | Grade 359 | Closest equivalent; minimum yield 359 MPa |
L360 Pipeline Steel Coil per GB/T14164-2013 PSL1 Application Introduction
L360 (X52) PSL1 pipeline coil is the starting material for the manufacture of longitudinal (LSAW) and spiral (SSAW) welded pipes used in oil, gas, and water transmission. It provides a cost-effective solution for moderate-pressure onshore and offshore pipelines. Typical applications and products include:
Product Applications: Spiral submerged-arc welded (SSAW) line pipe, Longitudinal submerged-arc welded (LSAW) line pipe, Electric resistance welded (ERW) casing and tubing, Coil for further roll-forming into hollow structural sections
Processed into products: Main pipeline segments (straight pipe), Hot induction bends and elbows, Pipe fittings (tees, reducers) when fabricated from coil stock, Piling pipe and conductor casing
Application industries: Oil & gas upstream and midstream transmission, Petrochemical plant piping, Water and slurry transportation, Structural and piling tubulars
L360 Pipeline Steel Coil per GB/T14164-2013 PSL1 Similar Grades with Close Properties
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| China | GB/T9711 | L290/X42 PSL1 | Lower strength (yield 290 MPa); suitable when lower pressure rating is acceptable |
| China | GB/T14164 | L415/X60 PSL1 | Higher strength (yield 415 MPa); requires adjusted welding procedures |
| USA | ASTM A572 | Grade 50 | Structural steel with similar strength (~345 MPa yield); not designed for sour service or pipeline toughness requirements |
| EU | EN 10025-3 | S355M/ML | Thermo-mechanical rolled structural steel; similar yield but different toughness/chemistry concept |
Notes:
For L360 (X52) PSL1, the steelmaker often ensures weldability through a low carbon equivalent (CE) typically below 0.43. Supplementary requirements (e.g., Sour service, drop-weight tear test) can be agreed upon at the time of order. Coil dimensions, tolerances, and surface quality are governed by the pipe manufacturing specification and the underlying strip standard (e.g., GB/T 709) unless otherwise agreed.
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