ASTM A252 ERW Steel Pipe
ASTM A252 ERW Steel Pipe
ASTM A252 specifies nominal wall cylindrical steel pipe piles where the steel cylinder acts as a permanent load-carrying member or as a shell to form cast-in-place concrete piles. Electric Resistance Welded (ERW) steel pipes are widely used in this standard.
Scope and Application
- Scope: The standard covers nominal (average) wall steel pipe piles of cylindrical form.
- Application: These piles are used for load-bearing applications and as shells for cast-in-place concrete piles. They are commonly implemented in construction and civil engineering projects such as bridges, foundations, and other structures requiring deep foundations.
Weld Seam Information
- Sizes: 12.375″, 14.00″, and 16.00″ OD.
- Weld Type: Submerged arc weld with up to 1/4″ OD weld reinforcement.
- Production: For ASTM A252 Grade 1, 2, and 3.
- Applications: Agricultural, industrial, and construction uses.
Manufacturing Process
- Electric Resistance Welded (ERW) Pipe: This type of pipe is produced by cold forming a flat steel strip into a cylindrical shape. The edges are then fused together using an electric resistance welding process to create a strong seam.
Grades and Mechanical Properties
| Grade | Yield Strength (min) | Tensile Strength (min) |
|---|---|---|
| 1 | 30,000 psi | 50,000 psi |
| 2 | 35,000 psi | 60,000 psi |
| 3 | 45,000 psi | 66,000 psi |
Chemical Composition
The chemical composition is typically composed of the following elements, varying slightly by grade:
| Element | Max % by Mass |
|---|---|
| Carbon (C) | 0.26-0.30 |
| Manganese (Mn) | 1.35 |
| Phosphorus (P) | 0.05 |
| Sulfur (S) | 0.045 |
| Silicon (Si) | 0.45 |
Physical Requirements
| Grade | Yield (min) | Elongation (min) | Tensile (min) |
|---|---|---|---|
| Grade 1 | 30,000 psi | Determined by wall | 50,000 psi |
| Grade 2 | 35,000 psi | Determined by wall | 60,000 psi |
| Grade 3 | 45,000 psi | Determined by wall | 66,000 psi |
Specification Notes
- Diameter Variation: +/- 1% variation allowed.
- End Use Specification: Specify end use and tubing application at the time of quote and order.
Dimensional Tolerances
- Diameter: ±1% of the specified outside diameter.
- Wall Thickness: The wall thickness at any point shall not be more than 12.5% under the specified nominal wall thickness.
Length and End Finish
- Standard Lengths: 20 to 40 feet, custom lengths available upon request.
- End Finish: Pipes can be plain-ended, beveled, or threaded as required by the application. End protection can be applied to prevent damage during handling and transportation.
Testing and Inspection
- Tensile Test: Required per lot to ensure compliance with mechanical property requirements.
- Flattening Test: Required per lot to ensure the pipe can be deformed without cracking.
- Visual Inspection: Each pipe is inspected for surface defects and straightness.
Corresponding Foreign Standards
| JIS Number | ASTM | BS | DIN | NF | ISO | Index Number |
|---|---|---|---|---|---|---|
| STKM11A | A512 | 1717 | 2391 | 3304 | ||
| STKM12A | A512 | 1717 | 2391 | 3304 | ||
| STKM12B | A512 | 2394 | ||||
| STKM13A | A312 | 1717 | 2391 | 2937 | ||
| STKM14A | A513 | 1717 | 2391 | 2937 | ||
| STKM15A | A513 | 1717 | 2391 | 2937 | ||
| STKM16A | A519 | 1717 | 2391 | 2937 | ||
| STKM17A | A519 | 1717 | 2391 | 2937 | ||
| STKM18A | A519 | 1717 | 2391 | 2937 | ||
| STKM19A | A519 | 1717 | 2391 | 2937 | ||
| STKM20A | A519 | 1717 | 2391 | 2937 |
Marking
Each pipe must be legibly marked with:
- Manufacturer’s name or trademark.
- Specification number (ASTM A252).
- Grade of steel.
- Heat number or other identifiers to ensure traceability.
Coating and Protection
- Coating Options: Pipes can be supplied with coatings such as black, galvanized, or other finishes to prevent corrosion.
- End Protection: Pipes can be supplied with caps or other means to protect the ends during handling and transport.
Applications
ERW steel pipes under ASTM A252 are used in various applications:
- Structural Support: As structural supports in buildings, bridges, and other structures.
- Piling: As piles in the foundations of buildings and other structures to bear loads.
- Casing: Used as casing for boreholes in cast-in-place concrete piles.
Environmental and Safety Considerations
- Handling: Proper handling procedures must be followed to prevent injuries and damage.
- Storage: Pipes should be stored in a dry, well-ventilated area to prevent corrosion.
Documentation and Compliance
- Certification: Each shipment is accompanied by the necessary documentation, including test reports and certificates of compliance with ASTM A252 standards.
Summary
ASTM A252 ERW steel pipes are essential components in construction and civil engineering for their strength, reliability, and versatility. The standard ensures that the pipes meet specific mechanical and chemical requirements, making them suitable for critical structural applications.
For more detailed specifications or particular inquiries, please consult the full ASTM A252 standard or contact the manufacturer.
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