ASTM A252 Grade 2 Piling steel Pipe desription
ASTM A252 GR2 pipe piles are spiral submerged arc welded pipe piles that conform to the American Society for Testing and Materials (ASTM) standard and are designed specifically for load-bearing structures in civil engineering.
Four Core Advantages:
High Load-Bearing Efficiency: Compressive strength up to 455MPa, single pile bearing capacity ≥8000kN, reducing the number of piles by 30% and lowering foundation costs.
Compressive Stability: Spiral weld seam disperses stress, axial compressive strength is 15-20% higher than straight seam welded pipe (LSAW), suitable for bridge pile foundations in earthquake zones.
Convenience of Construction: Standard length 6-24m (can be cut on-site), construction speed 30 piles/day, no curing required, shortening the construction period by 40%.
Economy: Cost 35% lower than seamless pipe and 15% lower than GR3 grade pipe piles, the first choice for temporary projects (such as foundation pit support).
ASTM A252 Gr 2 Pipe Specification
Size:1/2 to 24 inch
Schedule:10 to 160
OD:15 to 600NB
Thermal treatments : N, A, QT, SR
Type : Seamless
End: Beveled, Plain,Threaded
Shape : Square, Round, Rectangular
Test Requirements : Hardness, Non - destructive, Hardenability, Tension, Flaring Test
A252 GR2 Welded pipe Physical Requirements
| Grade | Yield (min) | Tensile (min) | Elongation (min) |
| Grade 2 | 35,000 psi | 60,000 psi | Determined by wall |
A252 GR2 V.S. API 5L
| Item | A252 GR2 | API 5L X52 |
|---|---|---|
| Yield Strength | ≥310 MPa (strict lower limit control) | ≥358 MPa (wider range) |
| Impact Toughness | Not mandatory | Charpy impact energy ≥40J at -20°C (to prevent low-temperature brittle fracture) |
| Inspection Standards | Hydrostatic test (2 times pressure) + 100% ultrasonic flaw detection | Hydrostatic test (1.5 times pressure) + spot X-ray inspection of welds |
| Defect Tolerance | Zero tolerance for cracks/lack of fusion (rejection for defects ≥0.5mm) | Minor defects allowed (e.g., porosity ≤3.2mm) |
A252 V.S.A242
| Feature | A252 (Welded and Seamless Steel Pipe Piles) | A242 (Corten Steel; Atmospheric Corrosion-Resistant Steel) |
|---|---|---|
| Primary Use | Steel pipe piles for structural foundations (e.g., piling, caissons). | Weathering steel for bridges, buildings, and outdoor structures exposed to atmospheric corrosion. |
| Material Type | Carbon steel pipes. | Low-alloy steel with improved atmospheric corrosion resistance. |
| Key Properties | - High strength for load-bearing. - Weldability. - Suitable for deep foundations. |
- Excellent weathering resistance (forms a protective rust layer). - Good mechanical properties. - Eliminates need for paint in some applications. |
| Corrosion Resistance | General corrosion resistance; may require additional coatings for harsh environments. | High resistance to atmospheric corrosion due to copper, chromium, and nickel alloying elements. |
| Applications | Deep foundations, marine structures, retaining walls. | Bridges, transmission poles, sculptures, architectural elements. |
| Mechanical Properties | Focused on tensile and yield strength for structural support. | Balanced strength and toughness with added corrosion resistance. |
| Surface Appearance | Standard steel surface; may oxidize without protection. | Develops a stable, protective rust-like appearance over time. |
| Cost Implications | Generally lower cost due to standard carbon steel composition. | Higher initial cost due to alloying elements, but may reduce long-term maintenance costs. |
A252 GR2 Steel Piling pipe applications
The A252 GR2 steel pipe pile is a type of steel pipe specifically designed for structural pile foundation applications, serving various important purposes. Below are some of its main application scenarios:
Building Foundation Support:
In large-scale engineering projects such as high-rise buildings, bridges, and elevated roads, A252 GR2 steel pipe piles are utilized as deep foundation support structures.
They can penetrate deep into the ground, providing stable support for buildings and ensuring their safety and stability.
Ocean Engineering:
In ocean engineering projects like offshore platforms, docks, and breakwaters, A252 GR2 steel pipe piles are widely employed due to their excellent corrosion resistance and strength.
They can withstand the harsh conditions of the marine environment, such as salt spray and wave impact, providing reliable support for ocean engineering projects.
Pile Foundation Construction:
A252 GR2 steel pipe piles are commonly used in pile foundation construction as pile shaft materials driven into the ground.
They can form good friction with the soil, enhancing the load-bearing capacity of the pile foundation and ensuring the stability of buildings.
Temporary Structure Support:
In some temporary buildings or engineering projects, such as temporary stages and exhibition halls, A252 GR2 steel pipe piles are also used as support structures.
They are easy to install and remove, quickly providing stable support for temporary structures.
Geological Disaster Prevention:
In areas prone to geological disasters, such as landslides and mudslides, A252 GR2 steel pipe piles can be used to construct protective structures, such as anti-slide piles and retaining walls.
They can effectively resist the destructive forces of geological disasters, protecting people's lives and property.
