Product Overview
ASTM A252 Pipe Piles are heavy-wall cylindrical steel pipes designed as permanent load-bearing columns for deep foundations, bridge piers, and seismic retrofitting. Available in seamless (SMLS) and submerged arc welded (SAW) variants, these Grade 1–3 piles withstand axial loads up to 4,500 kN/m² and lateral soil pressures exceeding 200 kPa. Compliant with ASCE 20-96 and AASHTO M252, they serve as cost-effective alternatives to concrete piles in flood zones, soft soils, and offshore structures.
Key Technical Specifications
1. Dimensional & Manufacturing Properties
- Size Range:
- Seamless: 6.35 mm (¼”) – 914 mm (36″) OD | Wall Thickness: 6.0–50 mm
- Welded: 21.3–3,620 mm OD | Wall Thickness: 6.35–65 mm
- Tolerances:
- OD: ±1.0% (seamless), ±1.5% (welded)
- Ovality: ≤1.5% of nominal OD
- Surface Treatments:
- Mill Scale (Black): For direct driving (friction coefficient: 0.35–0.45)
- Epoxy-Coated: 250–400 µm DFT for marine environments
2. Mechanical & Chemical Performance
Chemical Composition:
| Element | Grade 1 | Grade 2 | Grade 3 | Function |
|---|---|---|---|---|
| C | ≤0.30% | ≤0.30% | ≤0.30% | Enhances weldability |
| Mn | ≤1.00% | ≤1.30% | ≤1.60% | Increases yield strength |
| P | ≤0.050% | ≤0.050% | ≤0.050% | Reduces brittleness |
| S | ≤0.050% | ≤0.050% | ≤0.050% | Prevents hot cracking |
Mechanical Properties:
| Grade | Tensile (MPa) | Yield (MPa) | Elongation (%) | Hardness (HB) |
|---|---|---|---|---|
| 1 | ≥345 | ≥205 | ≥25 | ≤156 |
| 2 | ≥415 | ≥240 | ≥23 | ≤179 |
| 3 | ≥456 | ≥310 | ≥21 | ≤201 |
Axial Load Capacities:
| OD (mm) | Grade 2 Wall (mm) | Max Load (kN) | Soil Type |
|---|---|---|---|
| 219 | 8.0 | 1,200 | Soft clay |
| 508 | 12.7 | 3,800 | Sandy gravel |
| 1,220 | 25.4 | 9,500 | Bedrock |
Applications by Industry
| Industry | Use Case | Grade | Key Benefit |
|---|---|---|---|
| Civil Engineering | Bridge abutments, retaining walls | Grade 3 | 30% higher lateral load resistance vs. Grade 2 |
| Renewable Energy | Offshore wind turbine foundations | Grade 2 + Epoxy | 50-year design life in seawater |
| Transportation | Highway sound barrier pilings | Grade 1 | Reduces installation costs by 20% |
| Urban Development | High-rise building micropiles | Grade 3 | Supports 1,500+ ton vertical loads |
Global Standard Equivalents
| USA (ASTM) | Europe (EN) | Japan (JIS) | China (GB) |
|---|---|---|---|
| A252 Gr.2 | EN 10219 S355J0H | STK490 | GB/T 3091 |
| A252 Gr.3 | EN 10210 S460NH | STK540 | GB/T 13793 |
Certifications & Compliance
- Driving Standards: ASTM D4945 (Dynamic Load Testing)
- Welding Process: SAW (AWS D1.1/D1.8) with 100% UT/RT inspection
- Certifications: ISO 9001, API 5L, CE Marking (CPR)
Packing And Delivery
