API 5L PSL1 Grade A25 ERW Pipe Material
API 5L PSL1 Grade A25 ERW Pipe Material
Comprehensive data sheet for API 5L Grade A25 PSL1 ERW pipe, including chemical composition, mechanical properties, physical performance, equivalent grades, and application guidance.
Electric Resistance Welding (ERW), cold forming, bending, machining, hot-dip galvanizing
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API 5L PSL1 Grade A25 ERW Pipe Material Introduction
API 5L Grade A25 PSL1 is a low-strength carbon steel line pipe specified by the American Petroleum Institute (API). It belongs to Product Specification Level 1 (PSL1) and is typically manufactured as Electric Resistance Welded (ERW) pipe. The material offers reliable weldability and formability with minimum yield strength of 25 ksi (172 MPa) and minimum tensile strength of 45 ksi (310 MPa).
Key characteristics include:
- Good ductility and low-temperature flexibility compared to higher grades
- Excellent weldability without requiring preheat or post-weld heat treatment in most cases
- Low cost and wide availability for low-pressure applications
- Standard PSL1 requirements focus on basic chemical and mechanical properties, without stringent notch toughness or supplementary testing
API 5L A25 PSL1 is widely used in water transmission, gas distribution, structural supports, and general-purpose piping where pressure requirements are modest.
API 5L PSL1 Grade A25 ERW Pipe Material Chemical Composition
The chemical composition is in accordance with API 5L Table 5 for PSL1 Grade A25. Only the elements listed have maximum limits; residual elements are not specified and vary with steel source.Note: Carbon equivalent (CE) is not mandatory for PSL1 A25, but typical CE values are below 0.35, ensuring excellent weldability.
| Element | Maximum Content (wt%) | Remarks |
|---|---|---|
| Carbon (C) | 0.21 | Heat analysis |
| Manganese (Mn) | 0.60 | Heat analysis |
| Phosphorus (P) | 0.030 | |
| Sulfur (S) | 0.030 | |
| Others (Cu, Ni, Cr, Mo, V, Nb, Ti, etc.) | No specified limits | Residuals are controlled by steelmaking practice; not part of acceptance criteria |
API 5L PSL1 Grade A25 ERW Pipe Material Physical Properties
The values below are typical for low-carbon steel grades and are provided as reference information; they are not part of API 5L mandatory requirements. Slight variations may occur depending on exact composition and processing.
| Property | Typical Value | Unit | Conditions / Remarks |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20°C |
| Elastic Modulus (E) | 207 | GPa | At 20°C |
| Shear Modulus (G) | 80 | GPa | At 20°C |
| Poisson's Ratio (ν) | 0.30 | - | At 20°C |
| Thermal Expansion Coefficient (α) | 12.2 | 10⁻⁶ /°C | Between 20°C and 100°C |
| Thermal Conductivity (λ) | 52 | W/(m·K) | At 20°C |
| Specific Heat Capacity | 486 | J/(kg·K) | At 20°C |
| Electrical Resistivity (ρ_e) | 0.15 | µΩ·m | At 20°C |
API 5L PSL1 Grade A25 ERW Pipe Material Mechanical Properties
Mechanical properties apply to the pipe body at room temperature. For ERW pipe, the weld seam shall meet the same requirements as the base metal. Flattening or bend tests ensure weld integrity.Note: Notch toughness testing is not required for PSL1 Grade A25.
| Property | Required Value | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH/Rt0.5) | ≥ 172 (25) | MPa (ksi) | Transverse specimen (body), 0.5% total extension under load |
| Tensile Strength (Rm) | ≥ 310 (45) | MPa (ksi) | Transverse or longitudinal specimen |
| Elongation (A), min | 23 | % | In 50 mm (2 in) gauge length, formula: e = 1944 A^0.2/U^0.9, using standard specimen 25 mm wide; 23% typical for thin wall pipes |
| Bend Test (180°) | Mandrel diameter = 6 × wall thickness | For outside diameter ≤ 60.3 mm; no cracks or openings | |
| Flattening Test (for OD ≥ 60.3 mm) | No cracks or breaks | Plates closed to a distance H = (1+α)×t / (α + t/D); α = 0.07 for Grade A25 |
API 5L PSL1 Grade A25 ERW Pipe Material Direct Equivalent Standards and Substitution Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| International | ISO 3183 | L210 | PSL1 equivalent; essentially identical requirements |
| Europe | EN 10208-1 | L210GA | PSL1 grade for gas & liquid pipelines |
| China | GB/T 9711 | L210 | PSL1 line pipe; matches API 5L A25 |
| Russia/GOST | GOST 20295 | K20 (or 20) | Low-strength welded pipe; similar properties |
| Brazil | ABNT NBR 11888 | A25 | Harmonized with API 5L; direct substitute |
API 5L PSL1 Grade A25 ERW Pipe Material Application Introduction
API 5L A25 PSL1 ERW pipe is best suited for low-pressure fluid transportation and structural applications. It is economical and readily available in a wide range of sizes. While it is not intended for high-pressure or sour service, it performs well in common industrial environments.
Product Applications: ERW line pipes (plains and coated), Galvanized (GI) pipes, Structural hollow sections (round tubes), Fencing and handrail tubes, Scaffolding tubes
Processed into products: Water mains and service lines, Drainage and sewage pipes, Gas gathering and low-pressure distribution laterals, Steel framing for buildings, Street light poles and sign supports, Conduit sleeves and protective casings, Machine frames and conveyor rollers, Furniture frames (after forming)
Application industries: Water and Wastewater Treatment, Natural Gas Distribution (low-pressure, non-critical location), Construction and Infrastructure, Agriculture (irrigation systems), Mechanical and General Engineering, Fire Protection (sprinkler mains)
API 5L PSL1 Grade A25 ERW Pipe Material Similar / Alternative Materials with Comparable Performance
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A53 | Grade A | Slightly higher carbon; similar tensile but higher yield strength (~205 MPa); commonly used for structural and pressure piping |
| Japan | JIS G3452 | SGP | Carbon steel pipe for ordinary service; tensile > 290 MPa, comparable to A25 |
| Germany | DIN 1626 | St 37.0 | Welded carbon steel pipe; mechanical properties very close to A25 |
| China | GB/T 3091 | Q195 | Welded pipe for low-pressure fluid; yield ~195 MPa, tensile ~315 MPa; widely interchangeable with A25 |
Notes:
Ordering Information: When ordering API 5L Grade A25 PSL1 ERW pipe, refer to full designation including size (OD and wall thickness), length (single random, double random, or cut lengths), end finish (plain or beveled), and any coating requirements. Testing: Hydrostatic test is mandatory unless waived by mutual agreement per API 5L Clause 9. Dimensional tolerances follow API 5L for PSL1. Weld repair by electric welding is not permitted for ERW pipe under PSL1.
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