Cangzhou Spiral Steel Pipes Group Co.ltd
The Solid Foundation for Project SuccessASTM A252 Pipe Pile
Astm A252 Pipe Pile- Supplied By Cangzhou Spiral Welded Pipe Manufacturing Group
ASTM A252 Grade 1 2 3 Pipe Piles
Wuzhou supply ASTM A252 pipe pile in Grade 3, 2, and 1.
Sizes up to 144 inch,thickness schedule up to SCH 160,types in welded SSAW.
Coated available in 3PE, FBE, Galvanized as requested by customer.
ASTM A252 is a standard specification for steel pipe piles, covering three grades: Grade 1, Grade 2, and Grade 3. Grade 3 has the strongest bearing capacity and is most commonly used for heavy-duty pile foundations.
Cangzhou Spiral Welded Pipe Manufacturing Group produces Spiral Submerged Arc Welding (SSAW) steel pipe piles with specifications of Φ 219-3620mm, wall thickness of 6-25.4mm, and customizable length of 1-30m, with an annual output of 400000 tons.
Overview of ASTM A252
ASTM A252 is applicable to the nominal wall thickness of cylindrical steel pipe piles and does not cover rectangular pipes. Purpose: As a permanent load-bearing component or as a casing for pouring concrete piles.
The values are expressed in imperial units (convertible to SI （Système International d'Unités）).
Chemical Composition
The maximum phosphorus (P) is 0.050%. This is the only chemical element explicitly defined in the standard.
Mechanical properties
ASTM A252 Table 1- Tensile Requirements | |||
| Note-Where an ellipsis (...) appears in this table, there is no requirement. | |||
| Grade 1 | Grade 2 | Grade 3 | |
| Tensile strength, min, psi(MPa) | 50 000 (345) | 60 000 (415) | 66 000 (455) |
| Yield point or yield strength, min, psi(MPa) | 30 000 (205) | 35 000 (240) | 45 000 (310) |
Basic minimum elongation for nominal wall thicknesses 5/6 in. (7.9 mm) or more: | |||
Elongation in 8 in. (203.2 mm), min, % | 18 | 14 | ... |
Elongation in 2 in. (50.8 mm), min, % | 30 | 25 | 20 |
For nominal wall thicknesses less than %1e in. (7.9 mm), the deduction from the basic minimum elongation in 2 in. (50.08 mm) for each 1/32 - in. (0.8 mm) decrease in nominal wall thickness below 5/1e in. (7.9 mm), in percentage points | 1.50A | 1.25A | 1.0A |
A Table 2 gives the computed minimum values: | |||
Enlongations
| TABLE 2 Calculated Minimum Elongation ValuesA | ||||
| Nominal Wall Thickness | Elongation in 2 in. (50.8 mm), min, % | |||
| in | mm | Grade 1 | Grade 2 | Grade 3 |
| 5/16 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 |
3/16 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 |
A: When the nominal wall thickness is between the values in the table, calculate according to the following formula:
| Grade | Formula |
| 1 | E= 48t+ 15.00 |
| 2 | E= 48t+ 12.50 |
| 3 | E= 48t+ 10.00 |
where:
E = elongation in 2 in., %, and
t = specified nominal wall thickness, in.
Grade Selection
| Grade | Minimum Yield Strength | Minimum Tensile Strength | Typical Applications |
| Grade 1 | 30,000 psi (205 MPa) | 50,000 psi (345 MPa) | Light load pile foundation |
| Grade 2 | 35,000 psi (240 MPa) | 60,000 psi (415 MPa) | Conventional pile foundation |
| Grade 3 | 45,000 psi (310 MPa) | 66,000 psi (455 MPa) | Heavy load pile foundation, bridge, port |
Grade 3 has a yield strength about 29% higher than Grade 2, and can withstand larger loads with the same pipe diameter, or choose a more economical wall thickness under the same load.
Cangluo Group's products have been applied to national level projects such as the Three Gorges Dam, West East Gas Pipeline, South to North Water Diversion Project, and Daya Bay Nuclear Power Station.
Manufacturing Standards And Processes
Reference Standard
ASTM A370: Inspection Methods and Definitions for Mechanical Testing of Steel Products
ASTM A751: Test Methods for Chemical Analysis
ASTM A941: Terminology for Carbon Steel, Alloy Steel, and Stainless Steel
E29: Specification for the use of significant figures in test results
Spiral submerged arc welding (SSAW) process
Spiral forming of strip steel, double-sided submerged arc welding, with welds in a spiral shape. Suitable for large-diameter and thick walled steel pipe piles.
Cangluo Group has 13 spiral steel pipe production lines and 4 anti-corrosion and insulation production lines, with specifications of Φ 219-3620mm, wall thickness of 6-25.4mm, customizable length of 1-30 meters, and an annual output of 400000 tons.
Confirmation Is Required Before Procurement
| Case/Project | Content |
| Quantity | Feet, meters, or number of pieces |
| Material Name | steel pipe pile |
| Manufacturing Type | Spiral submerged arc welding (SSAW) |
Grade | Grade 1/Grade 2/Grade 3 |
Size | Outer diameter+nominal wall thickness (ASME B36.10 schedule) |
Length | 1-30 meters can be customized (single, double or fixed length) |
End type | Groove or flat end |
Inspection and Marking | Requirements for furnace number traceability and transportation labeling |
Allowable Range Of Defects
Defects with a depth exceeding 25% of the nominal wall thickness; No more than 22.5% can be repaired by welding. It must be completely removed before butt welding.
Material Analysis
Pre furnace analysis: The limiting element is phosphorus (P), and the pre furnace analysis results need to be reported to the customer in the MTC (Material Certificate).
Product analysis: The testing frequency is determined by the pipe diameter
| Pipe Diameter | Sampling Frequency |
| Under 14 inches | Take 2 samples every 200 |
| 14-36 inches | Take 2 samples every 100 |
| 36 inches or more | Take 2 samples every 3000 feet |
Tensile Testing
The tensile performance must meet the above requirements for tensile strength and yield strength. Note: If the yield point is not obvious, the yield strength corresponding to a permanent offset of 0.2% of the specimen gauge length should be tested, or the total elongation at 0.5% of the gauge length should be tested under load.
Weight And Dimensional Tolerances
Weight of steel pipe pile: measured in units (feet, meters, or pieces).
Allowable tolerance:
Weight:+15% to -5% of theoretical weight
Outer diameter: ± 1%
Wall thickness: ± 12%
Length: According to specified SRL, DRL, or custom lengths of 20 feet, 40 feet, and customized sizes.
Difference from other pipelines
The ASTM A252 steel pipe pile specification does not require hydrostatic testing. The reason is that steel pipe piles are usually formed by pouring cement and concrete on site, and are not used for liquid transportation, so there is no need for hydrostatic testing.
Testing method for spiral welded pipe steel pipe piles
Spiral welded pipe piles are manufactured using spiral submerged arc welding (SSAW) process, and the testing method is different from that of straight seam welding and seamless pipes. Please refer to ASTM A252 standard specification for details. All types are tested in our CNAS laboratory at room temperature.
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ASTM A252 Steel Pipe Pile FAQ
Q1: What are the levels included in ASTM A252?
Grade 1 (yield 30000 psi/205 MPa, tensile 50000 psi / 345 MPa）、Grade 2（35,000 psi / 240 MPa，60,000 psi / 415 MPa）、Grade 3（45,000 psi / 310 MPa，66,000 psi / 455 MPa）。 Grade 3 has the strongest bearing capacity and is most commonly used for heavy-duty pile foundations.
Q2: What is the phosphorus content limit?
Maximum 0.050%. This is the only clearly defined chemical element in A252.
Q3: What welding process is used?
Spiral submerged arc welding (SSAW), double-sided submerged arc welding after spiral forming of strip steel, suitable for large-diameter and thick walled steel pipe piles.
Q4: What diameter of A252 steel pipe piles can Cangluo Group produce?
Φ219–3620mm， Wall thickness 6-25.4mm, length 1-30m customizable, annual production capacity of 400000 tons.
Q5: What information is required for procurement?
Quantity, material name, manufacturing type, grade, size (outer diameter and nominal wall thickness), length, end form, inspection and transportation marking requirements.
Q6: Is A252 suitable for rectangular pipes?
Not applicable. Only covering cylindrical steel pipe piles.
Q7: What is the allowable range of defects?
Defects with a depth exceeding 25% of the nominal wall thickness; No more than 22.5% can be repaired by welding. It must be completely removed before butt welding.
Q8: Which scenarios are the three levels used for?
Grade 1 light load pile foundation; Grade 2 conventional pile foundation; Grade 3 heavy-duty pile foundation, bridge, port. According to the actual load of the project, it is not necessary to select the highest grade uniformly.
Q9: Does Cangluo Group have significant engineering supply experience?
have The product is applied in national level projects such as the Three Gorges of the Yangtze River, West East Gas Pipeline, South to North Water Diversion, Daya Bay Nuclear Power Station, and exported to countries such as Iraq, South Africa, and Sudan.
Q10: Can A252 steel pipe piles be used as the shell of concrete cast-in-place piles?
Okay. This is one of the explicitly covered purposes of the standard.