ASTM A252

ASTM A252

ASTM A252 Standard specification for welded and seamless steel piling pipes.

This specification applies to nominal (average) wall steel pipe piles with a cylindrical shape. It also applies to pipe piles in which the steel cylinder serves as a permanent load-bearing part or as a shell for cast-in-place concrete piles. The numbers expressed in inch-pound units should be considered standard.

ASTM A252 is an American standard for pipe piling material that is widely utilized in construction and structural buildings.

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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. Steel pipe pile lengths in the United States and Japan have surpassed 100 meters, with diameters up to 2500 mm. And even more so in China.

ASTM A252 pipe has a cylindrical design that bears weight and is suitable for a wide range of applications, including:

  • Buildings
  • Retaining walls
  • 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.

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 Piling Pipe

The standard stipulates a maximum 0.050 percent restriction for element P (phosphorous), since P makes steel weak and, more importantly, is bad for welding performance. The ASTM A252 standard standards solely indicate the phosphorus content; the remaining components are consistent with normal carbon steel composition.

Mechanical Properties of ASTM A252 Piling pipe

- Tensile Requirements of ASTM A252

Item

Grade 1

Grade 2

Grade 3

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)

- Elongations of ASTM A252 Pipe

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

30.00

25.00

20.00

9⁄32 or 0.281

7.1

28.50

23.75

19.00

1⁄4 or 0.250

6.4

27.00

22.50

18.00

7⁄32 or 0.219

5.6

25.50

21.25

17.00

3⁄1 6 or 0.188

4.8

24.00

20.00

16.00

11⁄64 or 0.172

4.4

23.25

19.50

15.50

5⁄32 or 0.156

4.0

22.50

18.75

15.00

9⁄64 or 0.141

3.6

21.75

18.25

14.50

1⁄8 or 0.125

3.2

21.00

17.50

14.00

7⁄64 or 0.109

2.8

20.25

16.75

13.50

The minimum elongation values determined for various nominal wall thicknesses are shown in the table above. When the stated nominal wall thickness is intermediate to those mentioned above, the minimum elongation value is as follows:

ASTM A252 Grade 1                       E = 48t + 15.00

ASTM A252 Grade 2                       E = 40t + 12.50

ASTM A252 Grade 3                       E = 32t + 10.00

Where:

E = elongation in 2 in., %, and

t = specified nominal wall thickness, in.

Defects Allowance of ASTM A252 PILING PIPES

Surface irregularities that surpass 25% are often referred to as defects, while deficiencies that do not exceed 22.5 percent of the nominal wall depth can be rectified by welding. These faults must be totally corrected before butt welding for two pipe piles.

Material Analysis for ASTM A252 Piling Pipes

  • Heat Analysis: Limits to elements P and heat result shall be reported in MTC to the customer.
  • Product Analysis: The pipe diameter determines the test frequency, which is less than 14 inches (2 samples every 200 pieces), 14 to 36 inches (2 samples per 100 pieces), and greater than 36 inches (2 samples per 3000 ft).
  • Tensile Requirements: The tensile strength and yield strength values listed above must be met. It should be noted that if a hazy yield point is obtained, then test yield strength corresponding to a permanent offset of 0.2 percent of the sample specimen’s gage length, or test a total extension of 0.5 percent of the gage length under load.

Weight and Dimension Tolerances for ASTM A252 Piling Pipes

  • Pipe pile weights per units (Feet, meter or lengths)
  • Tolerance allowed: A252 pipe pile weight shall be in +15% or -5% of theoretic weight. OD tolerances at +/-1%, wall thickness +/- 12%.
  • Lengths: As specified SRL, DRL, or fixed length 20 ft or 40 ft and customized.

Advantages of ASTM A252 Steel Piling Pipes

- Quality

  • Good weldability
  • Mill test reports for quality assurance

- Ease

  • Quick turnaround
  • Rolling cycles of 4–6 weeks
  • Drop-in rolling capabilities

- Savings

  • Value-added services, including welding, length cutting and more — saving time and money

Reference Standards for Making ASTM A252 Piling Pipe

  • ASTM A370: inspection methods and definitions for the mechanical test of steel products.
  • ASTM A751: Chemical analysis test methods
  • ASTM A941: Terminology for carbon, alloy, and stainless steel
  • E29: Practice for to use significant digits in test results to decide the conformance with specification.
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