API 5L PSL1 X42 (L290) Pipeline Steel Plate
API 5L PSL1 X42 (L290) Pipeline Steel Plate: Comprehensive Material Data
Complete material analysis of API 5L PSL1 X42 (L290) pipeline steel plate: chemical composition, mechanical & physical properties, international equivalents, similar materials, and application guide for oil & gas line pipe manufacturing.
Hot rolling, TMCP, normalizing rolling
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API 5L PSL1 X42 Pipeline Steel Plate Introduction
API 5L PSL1 X42 (also designated L290) is a pipeline steel grade specified for the manufacture of longitudinally welded steel pipes used in the transportation of oil, natural gas, and water. It belongs to the Product Specification Level 1 (PSL1) of API Specification 5L, which defines general requirements for line pipe without mandatory supplementary tests for toughness or sour service. Key characteristics include:
- Minimum yield strength of 290 MPa (42.1 ksi)
- Good weldability and formability for pipe production
- Widely adopted in global pipeline projects
This steel is typically supplied as hot-rolled plate or coil and processed into LSAW, ERW, or spiral welded pipes. Its balanced chemistry and mechanical performance make it a cost-effective choice for moderate-pressure transmission and distribution networks.
API 5L PSL1 X42 Pipeline Steel Plate Chemical Composition
The chemical composition limits for API 5L PSL1 X42 are defined in Table 3 of API Spec 5L. Only the elements shown are mandatory limits; other elements shall not be intentionally added but may be present as residuals from steelmaking. The sum of microalloying elements V+Nb+Ti is limited to control fine grain structure and toughness. Note: No maximum silicon or aluminum limits are specified for PSL1, but typical pipeline plates contain Si ≤ 0.40% for deoxidation.
| Element | Standard Value | Remarks |
|---|---|---|
| C | ≤ 0.28% | Maximum carbon content |
| Mn | ≤ 1.40% | Maximum manganese content |
| P | ≤ 0.030% | Maximum phosphorus content |
| S | ≤ 0.030% | Maximum sulfur content |
| V+Nb+Ti | ≤ 0.15% | Combined maximum of vanadium, niobium, and titanium |
API 5L PSL1 X42 Pipeline Steel Plate Thermal & Electrical Physical Properties
The following physical properties are representative for API 5L X42 pipeline steel and are based on typical values for carbon-manganese steels. They are not part of the API 5L standard but are widely used in engineering calculations for pipeline design, welding, and flow assurance. Slight variations may occur depending on heat treatment and actual composition. Density and modulus are essentially constant across such low-carbon steels.
| Property | Standard Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ (kg/dm³) | At 20°C |
| Elastic Modulus (E) | 210 | GPa | At 20°C, static tensile loading |
| Shear Modulus (G) | ~80 | GPa | Derived from E and ν |
| Poisson's Ratio (ν) | 0.3 | – | At room temperature |
| Coefficient of Thermal Expansion (α) | 12 × 10⁻⁶ | 1/K | Mean value, 20–100°C |
| Coefficient of Thermal Expansion (α) – elevated | 13.8 × 10⁻⁶ | 1/K | Mean value, 20–400°C |
| Thermal Conductivity (λ) | 50 | W/(m·K) | At 20°C |
| Specific Heat Capacity | 460 | J/(kg·K) | At 20°C |
| Electrical Resistivity (ρ_e) | 0.20 × 10⁻⁶ (0.20 μΩ·m) | Ω·m | At 20°C |
API 5L PSL1 X42 Pipeline Steel Plate Mechanical Properties
The mechanical properties listed below are the minimum requirements for API 5L PSL1 X42 (L290) pipe body plates as per API Spec 5L. Tensile testing is performed in the transverse direction at room temperature on standard specimens. No maximum yield or tensile strength is specified for PSL1. Elongation requirements depend on specimen type; the value shown is for a 12.7 mm diameter round specimen. Charpy impact testing is not mandatory unless specifically required by supplementary purchase requirements (e.g., for sour service or low-temperature applications).
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 290 (42.1 ksi) | MPa (ksi) | Transverse direction, room temperature, 0.5% total extension under load (or 0.2% offset) |
| Tensile Strength (Rm) | ≥ 415 (60.2 ksi) | MPa (ksi) | Transverse direction, room temperature |
| Elongation (A) | ≥ 22% | % | 12.7 mm diameter round specimen, 50.8 mm (2 in) gauge length, transverse direction |
| Elongation (A) – alternative | ≥ 16% (typical for strip) | % | Rectangular strip specimen, 1.5 in width, 2 in gauge length, transverse direction (if applicable) |
API 5L PSL1 X42 Pipeline Steel Plate Fully Equivalent Material Standards & Replaceable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| International | ISO 3183 | L290 (PSL 1) | Identical requirements for line pipe |
| Europe | EN 10208-1 | L290GA | PSL1 equivalent for combustible fluids pipelines |
| China | GB/T 9711 | L290 (PSL 1) | Harmonized with ISO 3183 |
| Russia/CIS | GOST R 52079 | Л290 (L290) | PSL1 line pipe steel |
| USA (alternative) | API 5L | X42 (same) | Identical standard, other editions also equivalent |
API 5L PSL1 X42 Pipeline Steel Plate Application Introduction
API 5L PSL1 X42 plate is predominantly used for manufacturing longitudinally welded pipes (LSAW, ERW, spiral welded) intended for moderate-pressure oil and gas transmission. It is also suitable for water and slurry pipelines, and for structural pipe applications. The plate's formability and weldability permit fabrication into various line pipe components.
Typical industries:
- Oil & Gas (upstream gathering, midstream transmission, downstream distribution)
- Petrochemical (process piping, plant utility lines)
- Water Treatment & Supply (raw water mains, wastewater force mains)
- Pipe Manufacturing (LSAW, spiral, ERW mills)
Product Applications: Longitudinally submerged arc welded (LSAW) pipes, Electric resistance welded (ERW) pipes, Spiral welded pipes, Line pipe for transmission and distribution systems, Riser pipes, conductor casing
Processed into products: Straight pipe sections (pipe body), Formed elbows (fabricated from plate), Tees, reducers (welded from plate), Welded-in fittings, Pipe spools and assemblies
Application industries: Oil & Gas, Petrochemical, Water Treatment & Transport, Pipe Manufacturing, Civil Engineering (piling, structural casing)
API 5L PSL1 X42 Pipeline Steel Plate Similar/Alternative Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA / International | API 5L | X46 (L320) | Higher strength (320 MPa yield); may be substituted with design recalc; similar weldability |
| USA / International | API 5L | X52 (L360) | Higher strength steel; used when thicker wall reduction is desired; check toughness requirements |
| USA | ASTM A572 | Grade 42 | Structural plate with similar yield (290 MPa); not intended for line pipe, but can be fabricated into pipe with additional evaluation |
| Europe | EN 10025-3 | S275J0/NL | Structural steel with 275 MPa yield; slightly lower strength, may be used for water pipe or structural tubing |
Notes:
Additional information:
- API 5L PSL1 X42 does not impose mandatory Charpy V-notch or drop-weight tear test (DWTT) requirements; these must be agreed upon as supplementary requirements (SR5, SR6) if needed for low-temperature or fracture control.
- The steel is typically fully killed and fine-grained thanks to V, Nb, or Ti additions, but this is not a mandatory requirement in PSL1.
- For sour service (H2S-containing environments), it is essential to use PSL2 or to specify special chemistry and testing per ANSI/NACE MR0175/ISO 15156; the standard PSL1 without SR is not intended for sour applications.
- Plate surface condition, flatness, and dimensional tolerances should follow API 5L requirements or be agreed upon at the time of enquiry and order.
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