GB/T 14164-2013 API 5L X42N (L290N) Normalized Pipeline Steel Coil
GB/T 14164-2013 API 5L X42N (L290N) Normalized Pipeline Steel Coil - Properties & Applications
Comprehensive material data for API 5L X42N (L290N) normalized pipeline steel coil per GB/T 14164-2013/ISO 3183:2012, including chemical, mechanical, thermal properties, equivalent grades, and application guidance.
Normalizing or normalizing rolling; subsequent processing into welded pipes by HFW, SAW, or spiral welding.
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GB/T 14164-2013 API 5L X42N Normalized Pipeline Steel Coil Introduction
API 5L X42N (L290N) is a normalized pipeline steel grade supplied as hot-rolled coil, intended for manufacturing welded line pipes for the petroleum and natural gas industries. It offers a minimum yield strength of 290 MPa (42 ksi) and excellent low-temperature toughness, making it suitable for demanding onshore and offshore pipeline applications. The "N" designation indicates a normalized or normalizing-rolled delivery condition, ensuring refined grain structure and consistent mechanical properties. This grade conforms to GB/T 14164-2013 (equivalent to ISO 3183:2012 and API Spec 5L) under Product Specification Level PSL2, which imposes stricter chemical and mechanical requirements than PSL1.
GB/T 14164-2013 API 5L X42N Normalized Pipeline Steel Coil Chemical Composition
Chemical requirements for X42N (L290N) PSL2 per GB/T 14164-2013 / ISO 3183 Table 3. The steel is fully killed and fine-grain treated. Limits are in weight percent (max unless range given). Trace elements are controlled to ensure weldability and toughness.
| Element | Standard Value (max %) | Remarks |
|---|---|---|
| Carbon (C) | 0.22 | For pipe with wall thickness ≤ 25 mm |
| Silicon (Si) | 0.45 | Upper limit; typical 0.15-0.35 |
| Manganese (Mn) | 1.20 | Max; may be adjusted for strength |
| Phosphorus (P) | 0.025 | Stricter than PSL1 |
| Sulfur (S) | 0.015 | Stricter than PSL1 |
| Niobium (Nb) | 0.05 | Microalloying element (optional) |
| Vanadium (V) | 0.05 | Microalloying element (optional) |
| Titanium (Ti) | 0.04 | Microalloying element (optional) |
| Nb+V+Ti | 0.15 | Sum of microalloying elements |
| Aluminum (total Al) | 0.015 – 0.060 | Fine grain practice |
| 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 |
| Boron (B) | 0.0005 | Max; not intentionally added |
GB/T 14164-2013 API 5L X42N Normalized Pipeline Steel Coil Thermal & Electrical Physical Properties
These values are typical for normalized low-carbon pipeline steel and are not specified in the product standard. They are provided for engineering calculations such as heat transfer, stress analysis, and electrical design. Actual values may vary slightly with precise composition and temperature.
| Property | Typical Value | Unit | Condition / Temperature |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | Room temperature |
| Modulus of Elasticity (E) | 205 | GPa | 20°C |
| Shear Modulus (G) | 80 | GPa | 20°C |
| Poisson's Ratio (ν) | 0.3 | - | - |
| Coefficient of Thermal Expansion (α) | 11.7 × 10⁻⁶ | K⁻¹ | 0 – 100°C |
| Thermal Conductivity (λ) | 50 | W/(m·K) | 20°C |
| Specific Heat Capacity (Cp) | 460 | J/(kg·K) | 20°C |
| Electrical Resistivity (ρₑ) | 0.15 | µΩ·m | 20°C |
GB/T 14164-2013 API 5L X42N Normalized Pipeline Steel Coil Mechanical Properties
Mechanical properties are specified for the finished pipe manufactured from the coil. Values apply to base metal thickness ≤ 25 mm. Tensile testing is transverse to rolling direction. Charpy V-notch impact test temperature is 0°C for PSL2 normalized grade, with average absorbed energy ≥ 27 J and single ≥ 20 J.
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | 290 – 495 | MPa | Transverse, 0.5% total extension |
| Tensile Strength (Rm) | 415 – 760 | MPa | Transverse |
| Yield-to-Tensile Ratio (ReH/Rm) | max 0.93 | - | For PSL2 pipe |
| Elongation (A) in 2 in. | ≥ 23 (typical, formula) | % | 50.8 mm gauge length, per API 5L formula |
| Charpy Impact Energy (KV) @ 0°C | ≥ 27 (avg), ≥ 20 (single) | J | 10×10 mm specimen, V-notch, longitudinal |
| Hardness | ≤ 250 HV10 | HV | Maximum allowable |
GB/T 14164-2013 API 5L X42N Normalized Pipeline Steel Coil Fully Equivalent Materials – International Standards & Grades
| Region/Country | Standard | Grade | Remarks |
|---|---|---|---|
| International | ISO 3183:2012 | L290N | Normalized, PSL2 |
| USA | API Spec 5L (46th Ed.) | X42N | Normalized, PSL2 |
| Europe | EN 10208-2:2009 | L290NB | Normalizing rolled; comparable chemistry and strength |
| China | GB/T 9711-2017 | L290N (X42N) | Identical technical content to ISO 3183 |
GB/T 14164-2013 API 5L X42N Normalized Pipeline Steel Coil Application Introduction
X42N (L290N) coil is the primary raw material for manufacturing welded line pipe for hydrocarbon and water transport. Its normalized microstructure ensures reliable ductility, toughness, and weldability under PSL2 strict quality standards. Typical applications include:
Product Applications: Spiral submerged-arc welded (SSAW) pipes, Longitudinal submerged-arc welded (LSAW) pipes, Electric resistance welded (ERW) pipes, Line pipe fittings (tees, reducers, elbows), Casing and tubing for shallow wells
Processed into products: Pipe body segments (mainline and gathering lines), Hot induction bends (after forming and heat treatment), Weld-on flanges (carbon steel forged from similar grade), Repair sleeves and clamps, Pipeline valve components (body, bonnet)
Application industries: Oil & Gas transmission, Petrochemical processing, Water and sewage infrastructure, Construction and civil engineering (structural pipe), Offshore and subsea pipelines
GB/T 14164-2013 API 5L X42N Normalized Pipeline Steel Coil Similar / Alternative Materials – Non-Identical but Comparable
| Region/Country | Standard | Grade | Remarks |
|---|---|---|---|
| International | ISO 3183 | L290 (X42) | PSL1 or as-rolled; lower toughness requirements |
| International | ISO 3183 | L290M (X42M) | TMCP delivery; alternative processing route with similar strength |
| USA | ASTM A572 / A709 | Grade 42 | Structural carbon steel, not intended for pipeline, but similar yield |
| Europe | EN 10025-2 | S275 | Non-pipeline structural steel; slightly lower strength |
| China | GB/T 1591 | Q345B | Comparable strength, different toughness and weldability profile |
Notes:
- Coil is typically supplied with mill test certificates (EN 10204 3.1 or 3.2) confirming compliance to GB/T 14164-2013 PSL2, including chemical analysis, tensile properties, and Charpy V-notch toughness at the agreed temperature (commonly 0°C).
- The normalized condition may be achieved by normalizing rolling followed by air cooling, or by a separate normalizing heat treatment.
- For hydrogen sulfide (sour) service, additional tests such as HIC and SSC may be required per NACE MR0175/ISO 15156; supplementary requirements SR5/SR6 of API 5L can be applied.
- Weldability: Carbon equivalent (CE) is typically controlled ≤ 0.43 (CE(IIW)) for improved field weldability.
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