ASTM A252
ASTM A252
The ASTM A252 standard covers steel piling pipe that is used in the construction industry for foundation applications. The ASTM A252 steel piling pipe is available in three grades based on strength levels: Grade 1, Grade 2, and Grade 3. The A252 steel piling pipe is made to requirements that include chemical composition, mechanical properties, and dimensions. The A252 steel piling pipe can be ordered in both welded and seamless steel construction, and each type has its own advantages. Welded steel pipe offers a lower cost option for foundations, while seamless steel pipe provides a higher degree of strength and durability. Grade 1 and Grade 2 steel piling pipe are suitable for most foundation applications, while Grade 3 steel pipe can be used for high-strength applications.
Why choose tuspipe?
Since 1998, Tianjin United Steel Pipe Co., Ltd (TUSPIPE) has been committed to supplying high-quality line pipes.
With over 500,000 tons annual production capacity, the company serves various fields and industries, such as oil & gas exploitation and transmission, ship & auto-building, water & electricity, environmental protection, mechanical engineering, infrastructure construction and etc.
TUSPIPE places a premium on product quality and rigorous product quality control. In order to maintain good product quality, the company has established a Test & Inspection Center since 2004. With a series of state-of-the-art tests and inspection equipment, the test & inspection center is able to perform the tensile tests, hydro tests, impact tests, DWTT, etc.
Applications of ASTM A252 Piling Pipe
Nowadays, ASTM A252 pipe piling is being developed for use in a direction with deep distances and large diameters, since structures, buildings, and bridges are becoming increasingly tall, even super tall. Piling pipe has a cylindrical design that bears weight and is suitable for a wide range of applications, including Buildings, Retaining walls, and Different structures that need a tough base. This guarantees that the construction is solid, stable, and of the greatest quality, ensuring toughness that satisfies international quality standards. The large diameter of the pipe prevents it from breaking under the weight of the structure or building. The pipe is also essential in stabilizing the foundation of the Retaining wall. Different structures need a tough base material that can resist different types of loads without bending or breaking. In conclusion, piling pipes have a large variety of applications due to their durability and strength.
Steel Grades of ASTM A252 Steel Piling Pipe
Based on the tensile strength and the yield strength the ASTM A252 is classified into three categories/grades:
Chemical Composition of ASTM A252 Steel Piling Pipe
The chemical analysis is quite important when ordering ASTM A252 steel pipes. The chemical analysis shall be performed by test methods, practices, and terminology ASTM A751. It shall be permissible for the buyer to make product analyses using 2 samples from each heat lot of pipe piles. The chemical composition thus determined shall conform to the requirement specified for phosphorus. The steel shall contain no more than 0.050% phosphorous.
Mechanical Properties of ASTM A252 Piling pipe
The ASTM A252 pipes must obey the demands for tensile properties that are set out in the tables below. The yield point is the point at which the beam falls, as detected by the gauge of the testing machine, dividers, or other accepted methods. If there is no definite yield point apparent, then the yield strength corresponding to either a 0.2% permanent offset of the gage length specimen or a 0.5% total extension of the gage length under load shall be determined instead. In other words, the material must meet certain standards for tension and yield to be viable for use. This is to ensure that it will not break under stress or strain and cause injury.
- Tensile Requirements
| Item | Grade 1 | Grade 2 | Grade 2 |
|---|---|---|---|
| Tensile strength, min, psi (MPa) | 50000 (345) | 60000 (415) | 66000 (455) |
| Yield point or yield strength, min, psi (MPa) | 30000 (205) | 35000 (240) | 45000 (310) |
- Minimum Elongations
| Nominal Wall Thickness | Elongation in 2 in. (50.8 mm), min, % | |||
|---|---|---|---|---|
| in. | mm | Grade 1 | Grade 2 | Grade 3 |
| 5⁄1 6 or 0.312 | 7.9 | 30 | 25 | 20 |
| 9⁄32 or 0.281 | 7.1 | 28.5 | 23.75 | 19 |
| 1⁄4 or 0.250 | 6.4 | 27 | 22.5 | 18 |
| 7⁄32 or 0.219 | 5.6 | 25.5 | 21.25 | 17 |
| 3⁄1 6 or 0.188 | 4.8 | 24 | 20 | 16 |
| 11⁄64 or 0.172 | 4.4 | 23.25 | 19.5 | 15.5 |
| 5⁄32 or 0.156 | 4 | 22.5 | 18.75 | 15 |
| 9⁄64 or 0.141 | 3.6 | 21.75 | 18.25 | 14.5 |
| 1⁄8 or 0.125 | 3.2 | 21 | 17.5 | 14 |
| 7⁄64 or 0.109 | 2.8 | 20.25 | 16.75 | 13.5 |
Permissible Variations of ASTM A252 Steel Piling Pipes
| Item | Tolerance |
|---|---|
| Unit Weight | +15%,-5% |
| Outside Diameter | ±1% |
| Wall Thickness | ±12.5% |
- The ASTM A252 standard specifies that each length of pipe pile must be weighted separately, and the weight must not vary more than 15% over or 5% under the theoretical weight. This ensures that the pipe will be able to support the load that it is intended to bear. The manufacturer must also ensure that the pipe conforms to the specified calculation formula unless otherwise specified on the purchase order.
- The outside diameter of pipe piles shall not deviate from the required outside diameter by more than 1%.
- At no point shall the wall thickness deviate by more than 12.5% below the nominal wall thickness.
