Based on ASTM A252 standards and engineering practice, GR2 and GR3 welded pipes are made of low-carbon steel or low-alloy steel (such as Q345B, API 5L X65), and form continuous welds through spiral welding. They exhibit uniform overall strength and are primarily used in deep foundation engineering, such as bridge pile foundations, high-rise building foundations, and port and wharf supports.
ASTM A252 GR2 vs GR3 Welded Pipe Technical Comparison
| Property | GR2 | GR3 | Engineering Impact |
|---|---|---|---|
| Yield Strength | ≥290 MPa | ≥345 MPa | GR3 bearing capacity ↑19% |
| Tensile Strength | ≥415 MPa | ≥485 MPa | GR3 has superior deformation resistance |
| Applicable Pile Depth | ≤40m (medium-shallow layers) | 40-100m (deep layers) | GR3 mandatory for skyscrapers/cross-sea projects |
| Impact Toughness | Standard test | Charpy V-notch test at -20°C | GR3 suitable for permafrost/seismic zones |
| Typical Cost | Baseline price | 15-20% higher than GR2 | Requires load-based precise selection |
A252 GR2 GR3 SSAW Steel Piles Pipe Specification
Outside Diameter: 18-5/8" (473.1 mm)
Length: R3 – 41 feet (approx. 12.5 meters)
Wall Thickness: 0.435" (11.05 mm)
Specification (Canada): ASTM A252 Grade 3
Specification (Europe): EN 10219 S355
Material Grade: High-strength structural steel
Application: Piling, Structural, Industrial
Quantity Available: 350 Metric Tons
Chemical Requirements For A252
Tensile Requirements
Dimension Tolerances Of Ssaw Steel Pipe
GR2 Pipe pile Applications:
Medium-sized Building Foundations: Pile foundations for buildings under 30 stories and factories (pile depth < 40 meters)
Inland Water Conservancy Projects: Riverbank protection, reservoir dams (non-corrosive environments)
Highway Bridge Piers: Medium-span bridges (primarily static loads)
GR3 pipe pile Applications:
Super High-Rise/Heavy Structures: Skyscrapers (e.g., the Shanghai Tower uses GR3 grade pile pipes, with a maximum depth of 82 meters)
Marine Engineering: Cross-sea bridges, deep-water wharves (with epoxy coating + cathodic protection)
High Seismic Resistance Requirements: Liquefiable soil layers in earthquake zones (elongation ≥ 18%, absorbing seismic energy)
Test and inspection
- Testing Requirements for seamless and welded A252 steel piling pipe
- Hydrostatic Testing: Not specified.
- Mechanical Tests:
Tensile Test: Either longitudinal or transverse at option of manufacturer.
3. Number of Tests: One tensile test per 200 lengths.
- Permissible Variations for A252 steel piling pipe
- Wall thickness: Not more than 12.5% under the nominal wall thickness specified.
- Weights per foot: The weight of any individual length of pipe shall not vary more than 15% over or 5% under the weight specified. Each individual length shall be weighed separately.
- Outside diameter: Shall not vary more than plus or minus 1% from the diameter specified.
- Lengths of A252 steel piling pipe
Steel Tubular Products A252 steel piling pipe may be ordered in single or double random lengths or in uniform lengths.
Packaging and shipping
