ASTM A252 Grade 2 Steel Pipe Pile specification
ASTM A252 GR2 pile pipe is a spiral welded steel pipe made of low-alloy structural steel, complying with Grade 2 of the ASTM A252 standard. Its key characteristics include:
Moderate strength: Yield strength ≥205 MPa, tensile strength ≥310 MPa.
Corrosion resistance: Suitable for temporary or short-term load-bearing structures, such as temporary supports or non-permanent pile foundations.
Size range: Wall thickness typically 6-12.7 mm, outer diameter ≥219 mm.
The pile pipe is manufactured using spiral welding (LSAW or SSAW) technology and must meet the requirements of the ASTM A252 standard, including hydrostatic testing.
astm a252 grade 2 equivalent
ASTM A252 Grade 2does not have a direct equivalent standardbut is defined by its mechanical properties: a minimum yield strength of 35,0o0 psi (240 MPa) and a minimum tensile strength of 60,oo0 psi (415 MPa).While other standards like ASTM A500 or ASTM A53 may be used for similar applications,A252 specifically refers to steel pipe piles for foundations, and has different chemical composition and dimensional tolerance requirements.
astm a252 grade 2 yield strength
The ASTM A252 Grade 2 yield strength is a minimum of 35,0o0 psi (240 MPa).
This grade of steel pipe pile also has a minimum tensile strength of 60,000 psi (415 MPa)
and an elongation of 25% in 2 inches.
- Minimum Yield Strength: 35,000 psi (240 MPa)
- Minimum Tensile Strength: 60,000 psi (415 MPa)
- Minimum Elongation (in 2 in.): 25%
astm a252 grade 2 chemical composition
| Element | Content Range (mass %) | Remarks |
| Carbon (C) | ≤0.25 | Low carbon content ensures weldability |
| Manganese (Mn) | 0.80-1.20 | Enhances strength and toughness |
| Phosphorus (P) | ≤0.040 | Strict control to reduce brittleness |
| Sulfur (S) | ≤0.050 | Impurity element, content must be limited |
| Silicon (Si) | 0.15-0.40 | Auxiliary strengthening element |
| Iron (Fe) | Balance | Base element |
Quality Testing Methods and Requirements
Before leaving the factory, ASTM A252 GR2 pile pipes must undergo the following quality tests:
Hydrostatic test: Pressurized to 2 times the working pressure for 15 seconds, with no leakage or permanent deformation.
Ultrasonic testing: 100% internal defect detection to ensure no cracks, laminations, etc.
Radar testing: Inspects reinforcement distribution and corrosion, suitable for high-precision scenarios.
Dynamic testing: Evaluates structural integrity through vibration or impact.
Requirements:
Testing quantity follows JGJ106-2014 specifications (e.g., low-strain method testing for ≥20% of total piles).
Piles must meet tensile strength ≥310 MPa and yield strength ≥205 MPa.
ASTM A252 GR2 pile pipes are primarily used in the following scenarios:
Temporary or short-term load-bearing structures: Such as temporary supports, non-permanent pile foundations, etc., suitable for projects with short construction cycles and rapid assembly requirements.
Bridge and building foundations: Used for reinforcement and support structures, commonly found in civil engineering fields such as highways, docks, and bridges.
Excavation support: Serves as a retaining structure in vertical support forms, particularly suitable for residential foundation pits without slope conditions.
