ASTM A252 specifies requirements for welded and seamless steel pipes used for piling applications. The standard ensures that pipes meet structural integrity requirements and are suitable for different construction and foundation projects.
Pipe Dimensions
Nominal Pipe Sizes (NPS):
ASTM A252 pipes are available in sizes ranging from NPS 6 (6 inches) to NPS 60 (60 inches).
The most commonly used sizes in practice are between 10 inches and 36 inches.
Wall Thickness:
Wall thickness varies depending on nominal size and project requirements.
Custom thicknesses are allowed to suit engineering needs, generally ranging from 0.250 inches to 0.500 inches or more, depending on load and soil conditions.
Outside Diameter (OD):
The OD corresponds to the nominal pipe size.
Example: NPS 6 → OD 6.625 inches, NPS 60 → OD 60.000 inches.
Length:
Pipes can be produced in various lengths, commonly 20–40 feet, with custom lengths available for specific project requirements.
Material Grades
ASTM A252 pipes are classified into three grades based on minimum yield strength:
| Grade | Minimum Yield Strength |
|---|---|
| Grade 1 | 35,000 psi (241 MPa) |
| Grade 2 | 42,000 psi (290 MPa) |
| Grade 3 | 50,000 psi (345 MPa) |
Chemical Composition
The steel used in ASTM A252 pipes must meet chemical composition standards to ensure durability and strength:
Carbon: Typically ≤ 0.25%
Manganese, Phosphorus, Sulfur, Silicon: Within standard limits
Testing Requirements
To guarantee quality and performance, ASTM A252 pipes undergo:
Non-destructive testing (NDT) for internal and external flaws
Mechanical testing for tensile strength, yield strength, and elongation
Dimensional checks to verify compliance with specified tolerances
Tolerances
| Dimension | Typical Tolerance |
|---|---|
| Outside Diameter | ±1/8 inch (≤12 in), ±1/4 inch (>12 in) |
| Wall Thickness | ±10% of nominal thickness |
| Length | ±2 inches |
Gnee provides high-quality ASTM A252 steel pipes in a wide range of sizes, lengths, and grades to meet your project's piling and foundation requirements, ensuring reliability, durability, and cost-effective solutions.
