What is the ASTM A252 steel pipe standard?

ASTM A252 is a standard specification developed by ASTM International for welded and seamless steel pipe piles used in construction and civil engineering projects. The ASTM A252 steel pipe piles covered by this standard are designed to support and transfer loads in foundations or serve as casing for driven piles.

Key Features of ASTM A252 steel pipe
1. Pipe Grades:
ASTM A252 steel pipe specifies three grades of steel pipe piles:

Grade 1: Minimum yield strength of 30,000 psi (205 MPa).
Grade 2: Minimum yield strength of 35,000 psi (240 MPa).
Grade 3: Minimum yield strength of 45,000 psi (310 MPa).
2. Chemical Composition:
The standard does not impose strict chemical composition limits but ensures the pipes meet the required mechanical properties. Composition is usually adjusted to balance weldability and strength.

3. Mechanical Properties:
Yield Strength: Varies by grade (30,000–45,000 psi).
Tensile Strength: Minimum of 50,000 psi (345 MPa) for all grades.
Elongation: Based on grade and pipe dimensions but typically ≥ 20%.

4. Manufacturing Process:
ASTM A252 steel pipe can be seamless or welded.
Welding methods include Electric Resistance Welded (ERW), Double Submerged Arc Welded (DSAW), or Longitudinally Submerged Arc Welded (LSAW).

5. Dimensional Requirements:
Wall Thickness: No specific limits, but must be uniform.
Diameter: Typically ranges from 6 inches to over 120 inches.
Length: Can be produced to fixed lengths or random lengths.

6. Surface Finish:
The ASTM A252 steel pipe is delivered with a plain or beveled finish.
The surface should be free from defects that impair the strength or serviceability of the pipe.

Applications of ASTM A252 Steel Pipe, Foundation Piles: Used to support bridges, buildings, and other structures. Marine Piling: Piers, docks, and bulkheads.Casing Pipes: For driven piles in drilled shafts. Structural Applications: Retaining walls, support columns, and bracing.