ASTM A252 Grade 3 Steel Pipe is widely used for steel piling applications and structural pipe piles. Manufactured under the ASTM A252 specification, these pipes cover nominal (average) wall steel pipe piles of cylindrical shape.
ASTM A252 Grade 3 pipe piles are designed for applications in which the steel cylinder acts either as a permanent load-carrying member or as a structural shell for cast-in-place concrete piles.
ASTM A252 Grade 3 Material & Manufacturing Process
Manufacturing Process
ASTM A252 Grade 3 pipe piles are produced using:
Electric Resistance Welded (ERW) process
Seamless pipe process
All welded pipe piles have longitudinal weld seams.
Steelmaking Process
The steel for Grade 3 piles is made using one or more of the following:
Open-hearth process
Basic-oxygen furnace
Electric-furnace process
ASTM A252 Grade 3 Chemical Composition
| Element | Maximum Content (%) |
|---|---|
| Phosphorus (P) | ≤ 0.050 |
Chemical analysis shall comply with ASTM A751 test methods and requirements.
ASTM A252 Grade 3 Mechanical Properties
| Steel Grade | Yield Strength (psi / MPa, min) | Tensile Strength (psi / MPa, min) | Elongation in 8 in (min %) | Elongation in 2 in (min %) |
|---|---|---|---|---|
| Grade 3 | 45,000 psi (310 MPa) | 66,000 psi (455 MPa) | - | 20% |
ASTM A252 Grade 3 Permissible Tolerances
Weight
Each pile length shall be weighed individually. Acceptable variations:
+15% above theoretical weight
–5% below theoretical weight
Outside Diameter
OD may not vary more than ±1% from the specified OD.
Wall Thickness
Wall thickness cannot be more than 12.5% below the nominal value.
Length
Pipe piles shall be furnished as:
Single random lengths
Double random lengths
Uniform specified lengths
Permissible length variation:
±1 inch (±25.4 mm)
