ASTM A252 Grade A LSAW Steel Pipe for Piling
ASTM A252 Grade A LSAW Steel Pipe for Piling - Properties and Equivalents
Explore ASTM A252 Grade A LSAW welded steel pipe intended for piling and structural support, covering chemical, mechanical and thermal properties according to ASTM A252 standard.
Welding, cold forming, hot rolling, cutting, beveling, coating
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ASTM A252 Grade A LSAW Steel Pipe for Piling Introduction
ASTM A252 Grade A is a welded or seamless carbon steel pipe pile grade primarily used for foundation and structural support applications. It is manufactured by longitudinal submerged arc welding (LSAW) and is designed to bear compressive, tensile and bending loads typical of deep foundations. The steel offers a minimum yield strength of 205 MPa (30 ksi) and tensile strength of 345 MPa (50 ksi) with good weldability and formability. Its chemical composition is controlled for phosphorus and sulfur to ensure sound welds and ductility. The pipe can be supplied in various diameters and wall thicknesses and is often used in bridge piers, building piles, marine structures and retaining walls.
- Minimum yield strength 205 MPa
- Good weldability for LSAW fabrication
- Standard lengths and sizes for piling
ASTM A252 Grade A LSAW Steel Pipe for Piling Chemical Composition
According to ASTM A252, only phosphorus and sulfur are restricted. Other elements are not specified but are typically controlled to ensure weldability and mechanical properties. When copper-bearing steel is specified, a minimum copper content is required for enhanced atmospheric corrosion resistance.
| Element | Standard Value | Remarks |
|---|---|---|
| Phosphorus (P) | ≤ 0.050% | Maximum allowed by ASTM A252 |
| Sulfur (S) | ≤ 0.045% | Maximum allowed by ASTM A252 |
| Copper (Cu) | ≥ 0.20% (if copper steel specified) | For improved corrosion resistance; otherwise not mandatory |
ASTM A252 Grade A LSAW Steel Pipe for Piling Thermal and Electrical Physical Properties
The following values are typical for low-carbon steel used in pipe piles and are not directly specified in ASTM A252. They are provided for design purposes. Actual properties may vary slightly with composition and manufacturing process.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | Ambient temperature |
| Modulus of Elasticity (E) | 200 – 210 | GPa | Room temperature |
| Shear Modulus (G) | 80 | GPa | Room temperature |
| Poisson's Ratio (ν) | 0.3 | - | Elastic range |
| Thermal Expansion Coefficient (α) | 11.5 – 12.5 | ×10⁻⁶/K | 20°C – 100°C |
| Thermal Conductivity (λ) | 50 – 60 | W/(m·K) | Ambient temperature |
| Specific Heat Capacity | 450 – 480 | J/(kg·K) | Ambient temperature |
| Electrical Resistivity (ρₑ) | 0.16 – 0.22 | ×10⁻⁶ Ω·m | 20°C |
ASTM A252 Grade A LSAW Steel Pipe for Piling Mechanical Properties
Tensile properties are determined on strip or full-section test specimens. Elongation requirements depend on wall thickness and specimen type. Impact toughness and bending tests are not required by the standard unless agreed upon between purchaser and manufacturer.
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 205 | MPa | Transverse strip test, 0.2% offset |
| Tensile Strength (Rm) | ≥ 345 | MPa | Transverse strip test |
| Elongation (A) | ≥ 25 | % | Gauge length 50 mm (2 in.), wall thickness ≥ 7.9 mm, strip test |
| Elongation (A) | ≥ 23 | % | Gauge length 50 mm (2 in.), wall thickness < 7.9 mm, strip test |
| Elongation (A) | ≥ 25 | % | Gauge length 200 mm (8 in.), wall thickness ≥ 7.9 mm, strip test |
| Elongation (A) | ≥ 23 | % | Gauge length 200 mm (8 in.), wall thickness < 7.9 mm, strip test |
ASTM A252 Grade A LSAW Steel Pipe for Piling Exact Equivalent Material Standards and Substitutable Grades
| Country/Region | Standard | Grade/Designation | Remarks |
|---|---|---|---|
| USA | ASTM A252 | Grade A | Original standard; LSAW or seamless pipe pile |
| International | ISO 3183 | L245 (most similar) | For pipeline, not exactly equivalent; yield 245 MPa |
| Europe | EN 10219-1 | S235JRH | Cold-formed welded structural hollow section; slightly higher yield |
| Japan | JIS A5525 | SKY400 | Steel pipe piles; yield 235 MPa, similar application |
ASTM A252 Grade A LSAW Steel Pipe for Piling Application Introduction
ASTM A252 Grade A LSAW pipe is designed for embedded structural support, primarily as foundation piles. Its reliable weld quality and strength make it suitable for heavy axial and bending loads. Common uses include:
- Deep foundation piles for buildings and bridges
- Marine structures such as docks, jetties, and dolphins
- Retaining wall systems and cofferdams
- Utility towers and wind turbine foundations
- Underground piping for structural casing
The pipe can be cut, welded, and coated to suit site conditions and corrosion protection requirements.
Product Applications: Steel pipe piles, Foundation casings, Structural support columns, Marine piles and fender systems, Retaining wall piles
Processed into products: Friction piles and end-bearing piles, Pile splices and connection rings, Bearing plates and tip reinforcement, Cofferdam cells and sheet pile connectors, Anchor pile systems
Application industries: Construction and civil infrastructure, Marine and offshore engineering, Bridge and highway engineering, Energy (wind, solar pylons), Utilities (transmission towers, drainage)
ASTM A252 Grade A LSAW Steel Pipe for Piling Similar and Alternative Materials for Comparable Applications
| Country/Region | Standard | Grade/Designation | Remarks |
|---|---|---|---|
| China | GB/T 9711 | L245 (PSL1) | Petroleum pipeline steel, yield 245 MPa; not for piling, but similar strength |
| Europe | EN 10025-2 | S235JR | Structural steel plate; used to fabricate pipe piles; yield 235 MPa |
| USA | ASTM A53 | Grade A | Welded and seamless pipe, yield 205 MPa; can be used for light piling |
| USA | ASTM A139 | Grade A | Arc-welded steel pipe, yield 205 MPa; for piling and structural use |
Notes:
ASTM A252 Grade A does not mandate impact testing or specific bend test requirements in the basic specification. Supplementary requirements (e.g., Charpy V-notch toughness, ultrasonic testing, or copper-bearing steel) can be specified by agreement. The pipe is typically supplied in random lengths up to 12 m, but longer lengths can be produced. Corrosion protection such as coal-tar epoxy, paint, or cathodic protection is often applied for aggressive environments. The LSAW manufacturing process ensures good dimensional accuracy and weld quality, making it suitable for driven piles.
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