API 5L PSL1 A25 LSAW Pipe
API 5L PSL1 A25 LSAW Pipe: Low-Strength Carbon Steel for Mild Applications
Comprehensive data sheet for API 5L PSL1 A25 longitudinal submerged arc welded line pipe, including chemical composition, mechanical properties, thermal-physical characteristics, and application guidelines.
Welding (SAW), Forming, Coating, Bending, Cutting, Beveling
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API 5L PSL1 A25 LSAW Pipe Introduction
API 5L PSL1 A25 LSAW pipe is a low-carbon pipeline steel manufactured by longitudinal submerged arc welding and supplied under the American Petroleum Institute specification API 5L, Product Specification Level 1 (PSL1). This grade represents the minimum strength designation within the API 5L family, offering a minimum yield strength of 172 MPa (25 ksi) and tensile strength of 310 MPa (45 ksi). Its composition is simple, with only carbon, manganese, phosphorus, and sulfur controlled. PSL1 imposes no mandatory impact testing, making it a cost-effective choice for non-critical, low-pressure fluid transport and structural applications. LSAW production allows large diameters and thick walls, providing versatility in water mains, gas distribution lines, and piling projects. The material is typically delivered in the as-welded condition, with optional coatings and end preparations.
API 5L PSL1 A25 LSAW Pipe Chemical Composition
The chemical composition of API 5L PSL1 A25 is restricted to the four elements listed below, as specified in the standard. No other elements are intentionally added, and there are no maximum limits for silicon, niobium, vanadium, titanium, or other microalloying elements. The values represent the heat analysis requirements per API 5L, Table 2.
| Chemical Element | Standard Value (wt%) | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.21 | Heat analysis; no product analysis tolerance specified for PSL1 |
| Manganese (Mn) | ≤ 0.60 | Heat analysis |
| Phosphorus (P) | ≤ 0.030 | Heat analysis |
| Sulfur (S) | ≤ 0.030 | Heat analysis |
API 5L PSL1 A25 LSAW Pipe Thermal and Electrical Physical Properties
These physical properties are typical for low-carbon steel grades and are not specified in API 5L. They are provided for general engineering reference.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | Room temperature |
| Modulus of Elasticity (E) | 210 | GPa | Room temperature |
| Shear Modulus (G) | 80 | GPa | Calculated (≈E/2(1+ν)) |
| Poisson's Ratio (ν) | 0.3 | - | Room temperature |
| Thermal Expansion Coefficient (α) | 12.0 | 10⁻⁶/K | 20–100 °C |
| Thermal Conductivity (λ) | 50 | W/(m·K) | At 20 °C |
| Specific Heat Capacity | 450 | J/(kg·K) | 20–100 °C |
| Electrical Resistivity (ρₑ) | 0.20 | µΩ·m | At 20 °C |
API 5L PSL1 A25 LSAW Pipe Mechanical Properties
The mechanical properties are determined on transverse test pieces taken from the pipe body. Test methods follow ASTM A370 or equivalent. The bend test is mandatory for welded pipe, and no impact testing is required under PSL1. For elongation, the minimum value depends on specimen dimensions; the table below reflects a typical 2 in (50.8 mm) gauge length rectangular specimen with wall thickness up to 10 mm.
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 172 (25 ksi) | MPa | Transverse, rectangular specimen, 0.5% total extension (or 0.2% offset) |
| Tensile Strength (Rm) | ≥ 310 (45 ksi) | MPa | Transverse, rectangular specimen |
| Elongation (A) | ≥ 28 | % | 2 in (50.8 mm) gauge length, rectangular specimen, wall thickness ≤ 10 mm |
| Bend Test | No cracks exceeding 3.2 mm after 180° bending | - | Base metal guided bend, former diameter = 3t (for elongation ≥ 25%); Weld zone same requirement |
API 5L PSL1 A25 LSAW Pipe Exact Equivalent Material Standards & Replaceable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| International (ISO) | ISO 3183 | L175 | Equivalent PSL1 line pipe matching A25 mechanical and chemical requirements |
| Europe | EN 10208-1 | L175GA | Matches A25 PSL1 for gas and water pipelines |
| China | GB/T 9711 | L175 | PSL1 equivalent line pipe grade |
API 5L PSL1 A25 LSAW Pipe Application Introduction
API 5L PSL1 A25 LSAW pipe is designed for low-demand environments where cost and weldability are priorities. Its low carbon content ensures excellent field weldability and formability. Typical applications include low-pressure fluid transmission, structural frameworks, and piling where impact toughness requirements are not critical. Due to its PSL1 classification, it is not recommended for sour service or high-consequence areas.
Product Applications: Low-pressure pipelines, Water mains and distribution networks, Structural columns and braces, Casing pipes for shallow wells, Fencing and signpost structures
Processed into products: Pipe spools and segmented runs, Welded flanges (compatible with A25 strength), Long-radius and short-radius elbows, Equal and reducing tees, Concentric and eccentric reducers, Couplings and repair sleeves
Application industries: Oil & Gas (low-pressure gathering lines), Water Treatment & Transmission, Structural & Construction, Piling & Civil Engineering, Fire Protection Systems
API 5L PSL1 A25 LSAW Pipe Similar / Alternative Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | API 5L | A (PSL1) | Slightly higher strength (min YS 207 MPa); compatible carbon steel for low-pressure service |
| USA | ASTM A53 | Grade A | Similar carbon steel pipe for mechanical and pressure applications; YS 205 MPa |
| Europe | EN 10217-1 | P235TR1 | Higher strength (min YS 235 MPa) welded pipe with similar chemistry; suitable for structural use |
| China | GB/T 9711 | L210 | Higher strength PSL1 line pipe (min YS 210 MPa); alternative where higher pressure rating is needed |
Notes:
A25 PSL1 is the lowest strength grade in API 5L, suitable for non-critical applications. LSAW pipes are produced with a single longitudinal seam, allowing large diameters up to approximately 60 inches. For services requiring notch toughness, sour resistance, or higher pressure ratings, consider API 5L PSL2 grades such as X42 or above. When ordering, specify diameter, wall thickness, length, end finish, and any supplementary coating or testing requirements beyond PSL1 baseline.
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