The A252 Grade specification is governed by the American Society of Testing and Materials and covers nominal (average) wall welded and seamless steel pipe used for piling purposes. In this grade, the pipe acts as a load bearing object or a shell for concrete piles, as per ASTM guidelines.
ASTM A252 definitions
ASTM A252 is the standard specification for welded and seamless steel pipe piles. It covers the nominal wall thickness of cylinder shape steel pipe, rectangular pipe is not included. These round pipes are used for piling purposes, playing as a permanent role of load carrying and bearing the pressure. Further more, to act as a tank shell to fill with the concrete piles at sight of the project.
This standard stated the values units in inch-pound (also could be translated to SI units), which provides the reference A252 pipe data to engineer or designer, for a strength base of the constructions.
Chemical composition and mechanical properties of ASTM A252 pipe
The standard has a limit for element P (phosphorous) maximum 0.050%, since P will make steel fragile, and most important is not good for welding performances. ASTM A252 standard specifications only defines the conten of phosphorous, other elements accord with general carbon steel material.
Reference standards for making ASTM A252 pipe
• ASTM A370 inspection methods and definitions for mechanical test of steel products.
• ASTM A751: Chemical analyze test methods.
• ASTM A941: Terminology for carbon, alloy and stainless steel.
• E29 practice for to use significant digits in test result to decide the conformance with specification.
ASTM A252 pile pipe material and manufacturing types
Considering on the manufacturing types, ASTM A252 pipe piles could be made by seamless or welded processes.
Seamless pipe pile
Seamless pipe pile referred as hot rolled or cold drawn and thermal expanded seamless pipe.
Welded pipe pile
Welded pipe pile including ERW (electric resistance welded), flash welded, fusion welded or sub-merged welded SSAW or LSAW. Longitudinal or helical spiral welded.
Raw material making process
Raw material iron and steel could be made through the process of Open-hearth, Basic-oxygen, Electric-furnace.
What information would be required before purchase A252 pipe pile
Before purchase the pipe piles under ASTM A252 specification, below information will be required:
a. Quantity in feet, meter, or number of lengths
b. Material Name in steel pipe pile
c. Manufacturing types in seamless or welded (ERW, EFW, LSAW, SSAW)
d. Grades (There are three levels of ASTM A252 Grade 3, 2, and 1)
e. Size (OD and nominal wall thickness, schedule in ASME B36.10)
f. Length in SGL, DGL or fixed length.
g. Ends types beveled or plain ends
h. Inspection related and shipping mark
|Wall Thickness||0.188" - 0.688"|
|Steel Grade||Tensile strength||Yield strength||Elongation|