A252 GR2 material possesses a balance between high strength and good ductility and toughness, with a typical yield strength ≥345MPa, tensile strength 470-630MPa, and elongation ≥20%. It exhibits excellent low-temperature impact toughness (impact energy ≥34J at -20℃), making it suitable for use in extremely cold regions. The material undergoes a controlled rolling and cooling process (TMCP), resulting in refined internal grains and excellent weldability and fatigue resistance.
A252 GR2 Pile pipe specification
Mechanical Requirement
Elogation Of ASTM A252 Pipes
Applications
1. Building Structures: Steel frames for high-rise buildings, seismic bracing components
2. Bridge Engineering: Box girders for long-span bridges, load-bearing components for bridge piers
3. Construction Machinery: Crane booms, wear-resistant parts for mining equipment
4. Special Vehicles: Heavy-duty truck chassis, container frames
Production Process:
1. Raw Material Inspection: The chemical composition and mechanical properties of the steel strip must meet the requirements of ASTM A252.
2. Forming and Welding: The steel strip is formed by a spiral rolling machine and welded using submerged arc welding (SAW) or high-frequency welding (HFW). The weld seams must be inspected by X-ray flaw detection.
3. Dimensional Calibration: Control the tolerances of outer diameter and wall thickness (e.g., outer diameter deviation ±0.5%, wall thickness deviation ±10%).
4. Performance Testing: Conduct hydrostatic tests (pressure ≥ 1.5 times the design pressure), tensile tests, bending tests, etc.
- Corrosion Protection Treatment:
The surface rust removal grade must reach Sa2.5 (near-white). The coating thickness is selected according to environmental requirements (e.g., 3PE coating thickness ≥ 2.5mm).
Test and inspection
Packaging and shipping
