ASTM A252 Grade 1 is a steel material used for pipe piles, designed to serve as a permanent load-bearing member or as a shell for cast-in-place concrete piles. As the lowest grade in ASTM A252, it is typically used in projects that require lighter load-bearing capacity.
Mechanical Properties
Minimum Tensile Strength: 50,000 psi (345 MPa)
Minimum Yield Strength: 30,000 psi (205 MPa)
Elongation Requirements
| Nominal Wall Thickness | Elongation in 2 in. [50.8 mm], min % |
|---|---|
| 5/16 in. [7.9 mm] | 30.00 |
| 9/32 in. [7.1 mm] | 28.50 |
| 1/4 in. [6.4 mm] | 27.00 |
| 7/32 in. [5.6 mm] | 25.00 |
| 3/16 in. [4.8 mm] | 24.00 |
| 11/64 in. [4.4 mm] | 23.25 |
| 5/32 in. [4.0 mm] | 22.50 |
| 9/64 in. [3.6 mm] | 21.75 |
| 1/8 in. [3.2 mm] | 21.00 |
| 7/64 in. [2.8 mm] | 20.25 |
Elongation Formula for Intermediate Wall Thicknesses
E=32t+15[E=1.90t+15]E = 32t + 15 \quad [E = 1.90t + 15]E=32t+15[E=1.90t+15]
Where:
E = Elongation in 2 in. [50.8 mm] %
t = Specified nominal wall thickness, in. [mm]
Chemical Composition
Phosphorus: ≤ 0.050%
ASTM A252 Grade 1 focuses primarily on mechanical performance and structural integrity, with relatively lenient chemical composition requirements.
Pipe Dimensions and Lengths
Lengths:
Single random: 16–25 ft [4.88–7.62 m]
Double random: >25 ft [7.62 m], with a minimum average of 35 ft [10.67 m]
Uniform: As specified, with ±1 in tolerance
Pipe Ends:
Plain end or beveled (30°–35°)
Cut by flame or machine
Relevant Standards
ASTM A370 – Mechanical Testing of Steel Products
ASTM A751 – Chemical Analysis of Steel Products
ASTM A941 – Terminology for Steel and Alloys
ASTM E29 – Using Significant Digits in Test Data
ASTM A252 does not require hydrostatic or non-destructive testing because these pipes are intended for foundation work, not fluid or gas transport. Structural integrity and load-bearing capacity are the key properties.
Ordering Information Having the following information available when making your ASTM A252 steel pipe purchase will give the manufacturer a more complete understanding of your needs and reduce unnecessary wasted time.
Quantity: feet or number of lengths; Name: steel pipe piles; Method of manufacture: Seamless or welded (LSAW, SSAW, ERW, etc.); Grade: Grade 1, Grade 2, Grade 3; Size: outside diameter and nominal wall thickness (SCH 40, SCH80, STD, etc); Weight: specify if each piece must be weighed; Lengths: single random, double random, or uniform; End finish: plain end or beveled end;
