GB/T 14164-2013 L245N (API 5L PSL2 Grade BN) Pipeline Steel Coil
GB/T 14164-2013 L245N (API 5L PSL2 Grade BN) Pipeline Steel Coil - Comprehensive Data
Detailed material data for L245N hot-rolled steel coil under GB/T 14164-2013, equivalent to API 5L PSL2 Grade BN, with normalizing rolling condition.
Normalizing rolling; suitable for subsequent processing methods such as UOE, JCOE, spiral welding, and ERW pipe forming.
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GB/T 14164-2013 L245N Pipeline Steel Coil Introduction
L245N is a normalizing rolled pipeline steel grade specified in GB/T 14164-2013 (Hot-rolled wide strip for oil and gas transmission pipelines). It corresponds to API 5L PSL2 Grade BN (L245N) and is designed for use in welded pipes for low to medium pressure fluid transmission.
- Minimum yield strength of 245 MPa, ensuring reliable mechanical performance under operational loads.
- Good low-temperature toughness, tested at 0°C with Charpy impact requirements.
- Strict control on chemical composition and carbon equivalent (CE) to guarantee excellent weldability and resistance to hydrogen-induced cracking (HIC) and sulfide stress cracking (SSC).
- Delivered in normalizing rolling (N) condition, providing a balanced ferrite-pearlite microstructure with fine grain size.
GB/T 14164-2013 L245N Pipeline Steel Coil Chemical Composition
The chemical composition is according to GB/T 14164-2013 Table 5 for grade L245N. The limits are designed to achieve target mechanical properties while maintaining good weldability. Carbon equivalent (CE) and Pcm values are controlled for field weldability and resistance to cold cracking. Elements such as V, Nb, Ti may be added singly or in combination for grain refinement and precipitation strengthening.
| Element | Standard Value (max, unless range) | Remarks |
|---|---|---|
| C | 0.24 | max |
| Si | 0.40 | max |
| Mn | 1.20 | max |
| P | 0.025 | max |
| S | 0.015 | max |
| V + Nb + Ti | 0.15 | max; microalloying elements may be used |
| Nb | 0.05 | typical max if added |
| V | 0.10 | typical max if added |
| Ti | 0.04 | typical max if added |
| Al (total) | 0.015 – 0.060 | for fully killed steel, recommended range |
| N | 0.012 | max |
| Cu | 0.35 | max; residual |
| Cr | 0.30 | max; residual |
| Ni | 0.30 | max; residual |
| Mo | 0.10 | max; residual |
| Carbon Equivalent (CE iiw) | 0.43 | max, depending on thickness and product analysis |
| Pcm | 0.25 | max, for certain wall thickness applications |
GB/T 14164-2013 L245N Pipeline Steel Coil Thermal and Electrical Physical Properties
The following physical properties are typical for low-carbon low-alloy hot-rolled steel used for L245N. These values are not specified in GB/T 14164-2013 but are representative for material selection and engineering calculations. Variations may occur with specific composition and processing.
| Property | Typical Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20°C |
| Elastic Modulus (E) | 205 | GPa | Room temperature |
| Shear Modulus (G) | 80 | GPa | Calculated from E and ν |
| Poisson's Ratio (ν) | 0.30 | — | Within elastic range |
| Thermal Expansion Coefficient (α) | 12.0 | 10⁻⁶/K | Linear, 20–200°C |
| Thermal Conductivity (λ) | 45 – 50 | W/(m·K) | At 20°C, slightly decreases with temperature |
| Specific Heat Capacity (cp) | 460 | J/(kg·K) | At 20–100°C |
| Electrical Resistivity (ρe) | 0.15 – 0.20 | μΩ·m | At 20°C |
GB/T 14164-2013 L245N Pipeline Steel Coil Mechanical Properties
Tensile and impact properties are based on GB/T 14164-2013 Tables 7 and 8 for L245N (PSL2). The yield strength (ReH) and tensile strength (Rm) apply to base material in the normalizing rolled condition. Elongation requirements are for gauge length 50 mm (or 5.65√S0). Charpy impact tests are carried out at 0°C; full-size specimen (10x10 mm) values are shown. For sub-size specimens, reduction factors apply.
| Property | Required Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Yield Strength (ReH) | 245 – 450 | MPa | Transverse, t ≤ 25.4 mm |
| Yield Strength (ReH) | 245 – 450 | MPa | Transverse, t > 25.4 mm (upper limit may be adjusted) |
| Tensile Strength (Rm) | 415 – 760 | MPa | Transverse, all thicknesses |
| Elongation (A50) | ≥ 22 | % | Transverse; for thickness ≤ 20 mm, gauge length 50 mm |
| Elongation (A5.65√S0) | ≥ 22 | % | Transverse; for thickness > 20 mm |
| Yield to Tensile Ratio (ReH/Rm) | ≤ 0.93 | — | For PSL2; ensures strain hardening capacity |
| Charpy Impact Energy (KV2) | ≥ 27 (individual min 20) | J | Transverse, 0°C, full-size specimen 10x10 mm |
| Bend Test (Mandrel Diameter) | 3T | — | 180° bend, T = specimen thickness; no cracks |
| Hardness (HV10) | ≤ 250 | HV | Microhardness; per agreement |
GB/T 14164-2013 L245N Pipeline Steel Coil Equivalent Standards and Substitutable Grades
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| International | API Spec 5L 45th Ed. | PSL2 Grade BN (L245N) | Identical technical delivery conditions; interchangeable |
| International | ISO 3183:2012 | L245N | Identical; normalizing rolled |
| Europe | EN 10208-2:2009 | L245NB | Normalizing rolled; equivalent weldable pipe steel |
| Russia / CIS | GOST R 52079-2003 | K52 (optional N) | Approximate; verify CE limits |
GB/T 14164-2013 L245N Pipeline Steel Coil Application Introduction
L245N pipeline steel coil is primarily used for manufacturing welded line pipes in the oil and gas industry. The normalizing rolling refines the microstructure, providing superior toughness and weldability compared to as-rolled grades. Typical applications include:
Product Applications: Spiral-submerged arc welded (SSAW) pipes, Longitudinally submerged arc welded (LSAW/UOE/JCOE) pipes, Electric resistance welded (ERW) tubes, Hot induction bends and fittings, Pipeline girth welds (consumables match L245N)
Processed into products: Onshore trunk line pipes (e.g., West-East Gas Pipeline projects), Flowlines in oil gathering systems, Riser pipes for offshore platforms, Piling pipes for marine structures, Gas distribution mains in urban utilities
Application industries: Oil and Gas Transmission, Petrochemical and Refinery Piping, Water Supply and Sewage, Structural Tubing for Offshore Platforms, Compressed Natural Gas (CNG) Transport
GB/T 14164-2013 L245N Pipeline Steel Coil Comparable and Alternative Steel Grades
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| China | GB/T 14164-2013 | L245 (as-rolled) | Same strength level, not normalizing rolled; lower toughness |
| China | GB/T 14164-2013 | L245M (TMCP) | Thermo-mechanical controlled rolled; similar strength, different delivery condition |
| International | API 5L PSL2 | Grade B (L245R, as-rolled) | Yield 245 MPa, but different delivery; may need additional testing for toughness |
| International | ISO 3183 | L245R (as-rolled) | Comparable strength, as-rolled condition |
| China | GB/T 9711-2017 | L245N | Line pipe standard; same steel grade for pipes; coil to pipe conversion |
Notes:
- Hydrogen Induced Cracking (HIC) and Sulfide Stress Cracking (SSC) tests may be ordered for sour service per NACE MR0175/ISO 15156, with stricter chemistry limits.
- For thicknesses above 20 mm, the minimum elongation may be reduced per standard tables.
- Charpy impact test temperature can be lowered to -20°C or -30°C upon agreement.
- When the steel coil is processed into pipes, the mechanical properties must comply with GB/T 9711-2017 (equivalent to ISO 3183) after pipe forming.
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