API 5L X46 PSL1 ERW Pipe
API 5L X46 PSL1 ERW Pipe: A Grade 46 Pipeline Steel Excellence
Complete material data, chemical and mechanical properties, thermal and electrical reference values for API 5L X46 PSL1 electric resistance welded (ERW) line pipe.
Electric resistance welding (ERW), hot rolling, cold forming, bending, machining
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API 5L X46 PSL1 ERW Pipe Introduction
API 5L X46 PSL1 ERW pipe is a medium-strength welded line pipe grade produced to the American Petroleum Institute (API) specification 5L, product specification level 1 (PSL1). This carbon-manganese steel is manufactured using the electric resistance welding process, offering a minimum specified yield strength of 46 ksi (317 MPa) and a minimum tensile strength of 63 ksi (434 MPa). It is designed primarily for conveyance of oil, gas, and water under moderate pressure and temperature conditions. PSL1 represents the basic quality level without mandatory impact testing, providing a cost-effective solution for non-sour service and low-risk applications. The material is supplied in the as-rolled or normalized condition with chemical composition optimized for good weldability and toughness. ERW pipes in this grade are produced from hot-rolled coils and are available in a wide range of outside diameters and wall thicknesses, making them suitable for onshore and offshore pipelines, structural piping, and gathering systems.
API 5L X46 PSL1 ERW Pipe Chemical Composition , % by Mass
Chemical composition limits for API 5L X46 PSL1 ERW pipe based on product analysis. Values represent maximum allowed concentrations unless a range is specified. The steel is carbon-manganese based with optional microalloying elements (V, Nb, Ti) added singly or in combination to achieve strength and toughness. Carbon equivalent (CE) is not mandatory for PSL1 but may be reported.
| Element | Limit (Max, %) | Remarks |
|---|---|---|
| Carbon (C) | 0.22 | For welded pipe (ERW); seamless pipe limit is 0.28% |
| Manganese (Mn) | 1.20 | Product analysis |
| Phosphorus (P) | 0.025 | Maximum for welded pipe |
| Sulfur (S) | 0.015 | Maximum for welded pipe |
| Vanadium (V) | 0.05 | Optional microalloy; sum V+Nb+Ti ≤ 0.15% |
| Niobium (Nb) | 0.05 | Optional microalloy; sum V+Nb+Ti ≤ 0.15% |
| Titanium (Ti) | 0.05 | Optional microalloy; sum V+Nb+Ti ≤ 0.15% |
| Silicon (Si) | Not specified | Typically 0.15–0.35 in fully killed steels |
| Nitrogen (N) | Not specified | Typically ≤0.012% unless bound by Al/Ti |
| Aluminum (Al) | Not specified | Usually added for grain refinement and deoxidation |
API 5L X46 PSL1 ERW Pipe Thermal and Electrical Physical Properties
The following values are typical for carbon-manganese pipeline steel of this grade and are not mandatory requirements of API 5L. They are provided for design calculations involving heat transfer, thermal expansion, and electrical conductivity. Properties are valid at ambient temperature unless otherwise stated.
| Property | Typical Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20°C |
| Elastic Modulus (E) | 205 | GPa | At 20°C, tension |
| Shear Modulus (G) | 80 | GPa | Calculated from E and ν |
| Poisson's Ratio (ν) | 0.30 | — | At 20°C, elastic range |
| Thermal Expansion Coefficient (α) | 11.7 | 10⁻⁶ /K | Between 20°C and 100°C |
| Thermal Expansion Coefficient (α) | 12.8 | 10⁻⁶ /K | Between 20°C and 200°C |
| Thermal Expansion Coefficient (α) | 13.5 | 10⁻⁶ /K | Between 20°C and 300°C |
| Thermal Conductivity (λ) | 51 | W/(m·K) | At 20°C |
| Specific Heat Capacity (Cp) | 480 | J/(kg·K) | At 20°C |
| Electrical Resistivity (ρ_e) | 0.18 | µΩ·m | At 20°C |
API 5L X46 PSL1 ERW Pipe Mechanical Properties
Tensile testing is performed at room temperature on longitudinal strip specimens removed from the pipe body. Yield strength and tensile strength are the primary certified values. Elongation is calculated using the API 5L formula; the typical minimum value for standard thicknesses is given for reference. Impact toughness is not required for PSL1 unless specified by supplementary order.
| Property | Required Value | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (Rt0.5) | 317–530 | MPa (ksi) | Room temperature, transverse strip specimen, 0.5% offset |
| Tensile Strength (Rm) | 434–655 | MPa (ksi) | Room temperature, transverse strip specimen |
| Elongation (A) | Determined by API 5L formula (typical ≥22% for t ≤20 mm) | % | Gauge length per ASTM A370 / ISO 6892, strip specimen |
| Yield to Tensile Ratio (Rt0.5/Rm) | ≤0.93 (typical) | — | Calculated from tensile data, indicative of ductility |
| Hardness (HV10) | ≤220 (typical) | HV | As per API 5L, if required |
API 5L X46 PSL1 ERW Pipe Completely Equivalent Material Standards and Substitute Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| International | ISO 3183 | L320 PSL1 | Identical yield strength requirement (320 MPa min) |
| Europe | EN 10208-2 | L320MB (PSL1 equivalent) | Slightly different composition and delivery condition; verify with manufacturer |
| China | GB/T 9711 | L320 | Corresponds to PSL1 L320; similar requirements |
API 5L X46 PSL1 ERW Pipe Application Introduction
API 5L X46 PSL1 ERW pipe is primarily used in moderate-pressure oil and gas transmission pipelines, where toughness requirements are not stringent. Its balanced strength and ductility, combined with good weldability, make it suitable for onshore and offshore line pipe projects. Typical industries and applications include:
Product Applications: Cross-country onshore pipelines, Gathering lines in oil fields, Flowlines and infield pipelines, Water injection lines, Gas distribution networks, Piling and structural tubular members
Processed into products: Straight pipe lengths (ERW), Pipe bends and elbows (when cold formed), Tees and reducers (fabricated from pipe), Flange adaptors, Pipeline valve bodies (wrought from pipe stock, depending on design)
Application industries: Oil & Gas (upstream and midstream), Water treatment and supply, Petrochemical plants, Construction and structural engineering (for piling, structural columns), Mineral slurry transport
API 5L X46 PSL1 ERW Pipe Similar or Closely Matching Alternative Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| International | API 5L | X42 (L290) | Lower strength grade; may be substituted with reduced design pressure |
| International | API 5L | X52 (L360) | Higher strength grade; offers enhanced pressure rating but may require stricter welding controls |
| International | API 5L | X46 PSL2 | PSL2 version with mandatory impact testing and tighter chemistry; suitable for more demanding environments |
| Europe | EN 10208-1 | L290GA | Lower strength; used for gas distribution |
| Europe | EN 10208-2 | L360MB | Higher strength steel for pipelines |
Notes:
- For ERW pipe, the weld seam must undergo appropriate non-destructive testing per the standard.
- Supplementary requirements (e.g., Charpy impact testing, hardness limits, sour service limits) can be added to PSL1 orders when specified.
- Allowable dimensional tolerances and end finishes should be agreed upon at the time of order.
- This material is not intended for use in H2S-containing environments unless specifically tested (NACE MR0175/ISO 15156).
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