GB/T14164-2013 X46N (L320N) PSL2 Pipeline Steel Coil
GB/T14164-2013 X46N (L320N) PSL2 Pipeline Steel Coil: Chemical & Mechanical Properties
Comprehensive data for GB/T14164-2013 X46N (L320N) PSL2 pipeline steel coil, including chemical composition, mechanical and physical properties, equivalents, and applications.
Hot rolling, normalizing rolling, cold forming, welding
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GB/T14164-2013 X46N PSL2 Pipeline Steel Coil Introduction
X46N (L320N) is a normalizing-rolled pipeline steel grade specified in GB/T 14164-2013 (equivalent to ISO 3183:2012) for line pipe applications. It belongs to PSL2 (Product Specification Level 2) with stringent requirements for toughness and chemical composition. The steel offers a minimum yield strength of 320 MPa (46 ksi) and excellent weldability due to low carbon equivalent. Key features:
- Normalized or normalizing rolled delivery condition
- Good low-temperature toughness per impact testing
- Suitable for oil and gas transportation pipelines
GB/T14164-2013 X46N PSL2 Pipeline Steel Coil Chemical Composition
The chemical composition as per GB/T 14164-2013 for PSL2 X46N (L320N) is controlled to ensure strength, toughness and weldability. Maximum limits apply for harmful elements like S and P. The sum of V+Nb+Ti is specified to refine grain size.
| Element | Specified Value (max, %) | Remarks |
|---|---|---|
| Carbon (C) | 0.22 | max |
| Silicon (Si) | 0.45 | max |
| Manganese (Mn) | 1.40 | max |
| Phosphorus (P) | 0.025 | max |
| Sulfur (S) | 0.015 | max |
| Vanadium (V) | Note 1 | V+Nb+Ti ≤ 0.15% |
| Niobium (Nb) | Note 1 | V+Nb+Ti ≤ 0.15% |
| Titanium (Ti) | Note 1 | V+Nb+Ti ≤ 0.15% |
| Aluminum (Al) | 0.060 | max, acid soluble |
| Nitrogen (N) | 0.012 | max |
| Copper (Cu) | 0.50 | max |
| Nickel (Ni) | 0.50 | max |
| Chromium (Cr) | 0.50 | max |
| Molybdenum (Mo) | 0.50 | max |
| Carbon Equivalent (CE) | 0.43 | max, CE = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15 |
GB/T14164-2013 X46N PSL2 Pipeline Steel Coil Physical Properties
The following physical properties are typical for low-alloy carbon steel used in pipeline steel grades and can be used for design calculations. Actual values may vary slightly with heat treatment and chemical composition.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | Room temperature |
| Elastic modulus (E) | 200 - 210 | GPa | Room temperature |
| Shear modulus (G) | Approx. 80 | GPa | Room temperature |
| Poisson's ratio (ν) | 0.27 - 0.30 | - | Ambient temperature |
| Thermal expansion coefficient (α) | 11.7 × 10⁻⁶ | K⁻¹ | 20-100℃ |
| Thermal conductivity (λ) | approx. 45 - 52 | W/(m·K) | at 20℃ |
| Specific heat capacity (cp) | approx. 460 - 500 | J/(kg·K) | Room temperature |
| Electrical resistivity (ρe) | approx. 0.15 - 0.25 | µΩ·m | at 20℃ |
GB/T14164-2013 X46N PSL2 Pipeline Steel Coil Mechanical Properties
Mechanical testing is performed on the base material in the transverse direction unless otherwise specified. Yield strength, tensile strength and elongation are determined. Impact testing is mandatory for PSL2 at 0℃ or lower as agreed. Bend test ensures formability.
| Property | Requirement | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | 320 - 525 | MPa | Transverse, 0.2% offset |
| Tensile Strength (Rm) | 435 - 655 | MPa | Transverse |
| Elongation after fracture (A) | ≥ 22 (typical) | % | Gauge length 50.8 mm (2 in), transverse, specimen area 200 mm² |
| Yield to tensile ratio (ReH/Rm) | ≤ 0.90 | - | Transverse |
| Impact absorbed energy (KV2) | ≥ 27 (average) | J | Transverse, 10×10 mm specimen, 0℃, single minima ≥ 20 J |
| Bend test (bending angle 180°) | No cracks | - | Diameter of bend former: 3×t for t ≤ 12.7 mm (typical) |
GB/T14164-2013 X46N PSL2 Pipeline Steel Coil Equivalent Material Standards and Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| International | ISO 3183:2012 | L320N | PSL2, normalized or normalizing rolled |
| USA | API Spec 5L (46th Ed.) | X46N | PSL2, equivalent |
| Europe | EN ISO 3183:2012 | L320N | Same as ISO |
| China | GB/T 14164-2013 | X46N (L320N) | The described grade |
GB/T14164-2013 X46N PSL2 Pipeline Steel Coil Application Introduction
X46N (L320N) pipeline steel is primarily used in welded line pipes for transportation of oil, gas, water and other fluids under high pressure. Its normalized microstructure ensures good strength and toughness, suitable for both onshore and offshore pipeline systems.
Product Applications: Spiral submerged arc welded (SSAW) pipes, Longitudinal submerged arc welded (LSAW) pipes, High frequency welded (HFW) pipes, Seamless pipes
Processed into products: Mainline pipe joints, Fittings and flanges, Line pipe supports, Offshore risers
Application industries: Oil and gas industry, Petrochemical, Water transmission, Structural engineering
GB/T14164-2013 X46N PSL2 Pipeline Steel Coil Similar Materials for Alternative Consideration
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| China | GB/T 14164-2013 | X42N (L290N) | Lower strength, similar toughness and weldability. |
| China | GB/T 14164-2013 | X52N (L360N) | Higher strength, still normalized, good ductility. |
| USA | API Spec 5L | X42N | Compatible with X46N in many pipeline projects. |
| International | ISO 3183 | L360N | Higher yield strength alternative with normalizing rolling. |
Notes:
Material must be supplied with mill test certificates according to GB/T 14164-2013. PSL2 requires stricter testing and documentation including chemical analysis per heat, tensile, impact and NDE. Note: Data presented is typical for compliance with the standard; actual properties must be verified by the producer.
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