ASTM A252 pipe piling material is commonly employed in construction and structural building projects. This standard specification is divided into three grades (1, 2, and 3), with Grade 3 being the most frequently used.
CG Steel Offers ASTM A252 Pipe Pile for Sale
We provide steel pipe piles adhering to the ASTM A252 standard with the following specifications:
- Grades: 1, 2, and 3
- Dimensions: Up to 48 inches in seamless and welded varieties
- Types: Seamless, Welded (ERW, LSAW, SSAW, DSAW)
- Thickness: Schedule STD, 40, XS, 80, XXS, 160
- Length: 6m, 12m, or customized to your requirements
- Ends: Beveled or Plain
- Coatings and Treatments: FBE, 3PE, Galvanized
Our A252 pipe piles are designed to meet diverse construction needs, ensuring durability and reliability in every project.
ASTM A252 Grade 3 - Popular Pipe Piling Material
ASTM A252 Grade 3 pipe is a widely used material for pipe piling applications. This grade is available in both seamless and welded forms, though the welded type is typically preferred due to the large diameters often required for pipe piles. ASTM A252 Grade 3 is known for its superior strength, boasting a tensile strength of 455 MPa (66,000 psi) and a yield strength of 310 MPa (45,000 psi).
ASTM A252 Standard Scope
The ASTM A252 specification outlines the requirements for welded and seamless steel pipe piles, which are used primarily for piling purposes. This standard applies exclusively to cylindrical steel pipes, excluding rectangular shapes. These round pipes are essential in construction for bearing loads and withstanding pressure. Additionally, they can serve as tank shells, filled with concrete piles at the project site.
The values in the ASTM A252 standard are provided in inch-pound units but can also be converted to SI units. This specification offers crucial reference data for engineers and designers to ensure the strength and stability of their constructions.
Types of ASTM A252 Pipe Piles
Seamless Pipe Pile: Seamless pipe piles are manufactured through processes such as hot rolling, cold drawing, and thermal expansion.
Welded Pipe Pile: Welded pipe piles come in various forms, including:
- ERW (Electric Resistance Welded)
- LSAW (Longitudinal Submerged Arc Welding)
- DSAW/SSAW (Spiral Submerged Arc Welding)
Chemical Composition and Mechanical Properties
The ASTM A252 standard specifies a maximum phosphorus content of 0.050%. Excessive phosphorus can make the steel brittle and prone to breaking, and it can also negatively impact welding processes.
Test Methods
Heat Analysis: The phosphorus content (P) limits must be included in the heat analysis report, which shall be provided to the customer in the Material Test Certificate (MTC).
Product Analysis: The frequency of product analysis testing varies based on the pipe diameter:
- For pipes under 14 inches in diameter, 2 samples are tested per 200 pieces.
- For pipes between 14 and 36 inches in diameter, 2 samples are tested per 100 pieces.
- For pipes over 36 inches in diameter, 2 samples are tested per 3000 feet.
Tensile Requirements: The tensile requirements follow the A252 specification. If the yield point is unclear, yield strength should be tested with a permanent offset of 0.2% of the gage length of the sample specimen, or to a total extension of 0.5% of the gage length under load.
Size and Weight Tolerance
Tolerances Allowed:
- Outer Diameter (OD) tolerances: +/-1%
- Wall Thickness tolerances: +/- 12%
- Weight tolerances: +15% or -5% of theoretical weight
Lengths: Pipes can be provided in Standard Random Lengths (SRL), Double Random Lengths (DRL), or fixed lengths of 20 feet or 40 feet, with customization options available.
Hydrostatic Test
The ASTM A252 pipe specification does not require a hydrostatic test. This is because piling pipes are typically filled with cement and concrete for structural purposes, rather than being used for liquid transmission. Therefore, a hydrostatic test is not necessary.
How Do Steel Pipe Piles Work?
Steel pipe piles are essential in construction scenarios where the soil beneath a building is loosely packed and poses stability concerns over time. Here's a breakdown of their functionality and benefits:
Stabilizing Loose Soil: In cases where the soil is not tightly packed, steel pipe piles help ensure the stability of the structure. By driving these piles deep into the Earth, the weight of the building is transferred to deeper, more compact soil layers. This even distribution of weight enhances the overall stability and durability of the construction.
Supporting Large Structures: Steel pipe piles are particularly useful in the construction of large buildings that require additional support. When the soil alone cannot provide sufficient stability, these piles offer a reliable solution by anchoring the building to the firmer soil found at greater depths.
Maximizing Limited Space: In areas with limited land space, where traditional spread footers or foundations are not feasible, steel pipe piles offer a practical alternative. By using pipe piles, buildings can achieve greater stability without the need for extensive ground space, making them ideal for urban environments or constrained construction sites.
Enhanced Ground Stability: When land area is small and insufficient for wide foundations, steel pipe piles provide the necessary support to ensure the building's stability. This method allows for better load distribution and a more secure foundation, crucial for maintaining the integrity of the structure over time.
Steel pipe piles are a critical component in modern construction, offering stability and support in challenging soil conditions and space-constrained environments. They play a vital role in ensuring the longevity and safety of buildings, particularly those with significant size and weight.
