GB/T14164-2013 Grade L415N (X60N) Pipeline Steel Coil
GB/T14164-2013 Grade L415N (X60N) Pipeline Steel Coil: Properties and Applications
Comprehensive material data for GB/T14164-2013 L415N (X60N) pipeline steel coil, covering chemical composition, mechanical properties, thermal and electrical properties, equivalent grades, and application guide.
Applicable processes: electric resistance welding (ERW), submerged arc welding (SAW), cold forming, cutting, and machining; primarily intended for pipe manufacturing.
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GB/T14164-2013 Grade L415N Pipeline Steel Coil Introduction
GB/T14164-2013 Grade L415N (X60N) is a normalized or normalizing rolled pipeline steel for oil and gas transportation systems, corresponding to PSL2 requirements under API 5L/ISO 3183. The steel provides a minimum yield strength of 415 MPa, excellent low-temperature toughness, and good weldability, making it suitable for high-pressure transmission pipelines in demanding environments. It is typically supplied as hot-rolled coil used to manufacture welded pipes such as ERW and spiral submerged arc welded (SSAW) pipes. The normalized condition ensures consistent mechanical properties and resistance to crack propagation.
GB/T14164-2013 Grade L415N Pipeline Steel Coil Chemical Composition
Typical maximum allowable chemical composition for L415N (X60N) pipe body according to GB/T 14164-2013 PSL2 requirements. Elements not listed are not intentionally added unless agreed between purchaser and manufacturer.
Key control: V+Nb+Ti sum ≤0.15%; Carbon Equivalent CEIIW and CEPcm limits for weldability.
| Chemical Element | Standard Value (max unless range) | Remarks |
|---|---|---|
| C | ≤0.22 | For ladle analysis |
| Mn | ≤1.40 | Deoxidizer and strength enhancer |
| Si | ≤0.45 | Deoxidizer |
| P | ≤0.025 | Low phosphorus for toughness |
| S | ≤0.015 | Low sulfur for cleanliness and HIC resistance |
| V | ≤0.05 | Microalloy; V+Nb+Ti ≤0.15 |
| Nb | ≤0.05 | Microalloy; V+Nb+Ti ≤0.15 |
| Ti | ≤0.04 | Microalloy; V+Nb+Ti ≤0.15 |
| Cu | ≤0.50 | May be restricted for certain environments |
| Ni | ≤0.50 | Residual element limit |
| Cr | ≤0.50 | Residual element limit |
| Mo | ≤0.50 | Not normally added; limit for residual |
| CE IIW | ≤0.43 | Carbon Equivalent typical maximum for welding |
| CE Pcm | ≤0.25 | Typical maximum for PSL2 grades |
GB/T14164-2013 Grade L415N Pipeline Steel Coil Thermal and Electrical Properties
The following physical properties are typical for low-alloy pipeline steel and can be used for design calculations; they are not mandatory requirements of GB/T 14164-2013. Values may vary slightly with specific chemical composition and heat treatment.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | Ambient temperature |
| Elastic modulus (E) | 210 | GPa | Ambient temperature |
| Shear modulus (G) | 80 | GPa | Ambient temperature (calculated) |
| Poisson's ratio (ν) | 0.3 | — | Ambient temperature |
| Thermal expansion coefficient (α) | 11.7 | 10⁻⁶/°C | 20–200°C |
| Thermal conductivity (λ) | 51.9 | W/(m·K) | At 20°C |
| Specific heat capacity (cp) | 486 | J/(kg·K) | At 20°C |
| Electrical resistivity (ρₑ) | 0.20 | μΩ·m | At 20°C |
GB/T14164-2013 Grade L415N Pipeline Steel Coil Mechanical Properties
Minimum tensile and impact requirements for L415N pipe body (longitudinal or transverse strip specimens) according to GB/T 14164-2013. All specimens are taken from finished pipe or from coil processed into pipe. Impact test temperature 0°C for PSL2 N grade.
| Property | Standard Requirement | Unit | Test Condition / Remarks |
|---|---|---|---|
| Yield strength (Rt0.5) | 415 – 565 | MPa | Transverse strip specimen, 0.5% total extension under load |
| Tensile strength (Rm) | 520 – 760 | MPa | Transverse strip specimen |
| Elongation (A) – longitudinal | ≥22 | % | Gauge length 50 mm; for wall thickness ≤20 mm |
| Elongation (A) – transverse | ≥19 | % | Gauge length 50 mm; for wall thickness ≤20 mm |
| Charpy V-notch impact (KV) at 0°C | ≥40 (average) / ≥30 (single) | J | Transverse specimen, full-size (10×10 mm); temperature 0°C |
| Bend test (180° guided bend) | No crack exceeding 3 mm in any direction | — | Bend mandrel diameter = 3 × wall thickness (PSL2); no complete fracture |
GB/T14164-2013 Grade L415N Pipeline Steel Coil Fully Equivalent Standards and Substitutable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| China | GB/T 14164-2013 | L415N (X60N) | Original specification; normalized PSL2 pipe steel |
| International | API Spec 5L (46th Ed.) | X60N PSL2 | Identical mechanical and chemical requirements |
| International | ISO 3183:2012 | L415N | Base standard for GB/T 14164; complete equivalence |
| Europe | EN 10208-2:2009 | L415NB | Normalized grade; virtually identical properties, may differ slightly in CEV limits |
| Canada | CSA Z245.1-18 | Grade 414 Cat II | Minimum yield 414 MPa, similar toughness, suitable substitute for L415N |
GB/T14164-2013 Grade L415N Pipeline Steel Coil Application Introduction
L415N steel coil is primarily used to manufacture longitudinal submerged arc welded (LSAW), spiral submerged arc welded (SSAW), and electric resistance welded (ERW) pipes for oil and gas transmission. Its normalized microstructure ensures uniform mechanical properties and good resistance to brittle fracture.
- Suitable for high-pressure onshore/offshore pipelines
- Can be used in mildly sour service when supplementary requirements are met
- Ideal for cold-formed pipe fittings and structural hollow sections
Product Applications: Line pipe (ERW, LSAW, SSAW), API 5L certified pipe, Casing and tubing (limited sour service), Structural hollow sections (CHS, RHS), Pressure vessel shells (with approved code case)
Processed into products: Straight pipe segments (pipeline main line), Induction bends (hot formed), Cold-formed elbows, tees, reducers, Weld-on flanges (WNRF), Headers and manifolds, Pipe piles for marine structures
Application industries: Oil and Gas (upstream, midstream), Petrochemical processing, Water transmission infrastructure, Structural and civil engineering (piling, tubular structures), Power generation (cooling water, steam lines)
GB/T14164-2013 Grade L415N Pipeline Steel Coil Similar or Comparable Substitute Grades
| Country/Region | Standard / Grade | Designation | Remarks |
|---|---|---|---|
| China / International | GB/T 14164 / API 5L / ISO 3183 | L450N (X65N) | Higher yield strength 450 MPa; suitable for higher pressure pipelines but requires more forming power |
| International | API 5L | X60M PSL2 | Thermomechanical rolled; same strength level, different delivery condition, may offer slightly different toughness |
| International | API 5L | X60Q PSL2 | Quenched and tempered; same strength, used where enhanced sour service or specific properties are required |
| Europe | EN 10208-2 | L415MB | Thermomechanical rolled; similar strength, good for large diameter thin-wall pipes |
Notes:
Special requirements: For sweet or sour service applications, additional chemical restrictions (e.g., lower S, addition of Ca for inclusion shape control) and supplementary tests (HIC, SSC, NACE TM0284) may be mandated by the purchaser. Welding procedures should consider the carbon equivalent (CEIIW ≤0.43) and may require preheating for thicker walls. The coil is usually supplied with test certificates (EN 10204 3.1) and marking per GB/T 14164-2013.
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