A252 GR3 spiral welded pipe is a type of spiral welded steel pipe made from low-alloy structural steel, complying with Grade 3 of the ASTM A252 standard. Its key features include:
High strength: Yield strength ≥310 MPa, tensile strength ≥455 MPa.
Corrosion resistance: Suitable for permanent load-bearing structures or concrete pile shells.
Size range: Wall thickness 0.8-6 mm, outer diameter typically ≥219 mm.
The production process uses spiral welding technology, with hot-rolling ensuring structural integrity. Typical parameters include hydrostatic test pressure and allowable operating temperature, as specified in the ASTM A252 standard.
astm a252 grade 3 equivalent
There is no single, direct equivalent for ASTM A252 Grade 3, as it is a specific material standard for pipe piles, but it has the same mechanical properties as the ASME SA252 Grade 3 standard. Its closest equivalents are other steel grades with similar high tensile and yield strengths, such as EN 10219 and a comparison to ASTM A500, which is used for structural purposes but has a lower strength.
a252 grade 3 yield strength
The minimum yield strength for ASTM A252 Grade 3 is 45,000 psi (310 MPa). This grade of steel pipe is commonly used for heavy-duty piling applications, such as in foundations for high-rise buildings and bridges, due to its high strength.
- Yield Strength: 45,000 psi (310 MPa)
- Elongation: 20%
astm a252 grade 3 tensile strength
The minimum tensile strength for ASTM A252 Grade 3 is 66,000 psi (455 MPa). This grade also has a minimum yield strength of 45,000 psi (310 MPa) and is commonly used for pipe piling due to its high strength.
- Tensile Strength: 66,000 psi (455 MPa) minimum
astm a252 grade 3 chemical composition
The chemical composition of ASTM A252 Grade 3 steel is primarily defined by its phosphorus content, which must be no more than O.050%.The steel also contains other elements, such as carbon, manganese, silicon, and sulfur, which contribute to its high strength and durability.
Phosphorus (P): ≤0.050%
Other elements: The steel also contains carbon, manganese, silicon, and sulfur.
Note: The specific percentages for carbon, manganese, silicon, and sulfur are not explicitly listed in the available search results, as the A252 standard focuses on phosphorus as the key limiting element for this grade.
astm a252 grade 3 density
The density of ASTM A252 Grade 3 is approximately 7850 kg/m²(0.284 1b/in²), which is the standard density for carbon steel. This value is not a material-specific property listed in the A252 standard itself, but a general property of steel used to calculate weight based on volume, which is essential for determining the weight of pipes per unit length.
ASTM a252 grade 3 specifications
astm a252 grade 3 welding process
- Raw Material Preparation
Low-alloy structural steel coil plates are used, which must undergo ultrasonic testing to ensure no cracks, laminations, or other defects. The quality of welding wire and flux is also inspected.
- Spiral Forming and Welding
Flattening and Trimming: The steel strip is flattened by a press anvil machine, and the edges are deburred by a trimming machine.
Spiral Curling: The steel strip is curled into a pipe blank through a spiral forming machine, forming a spiral-shaped pipe tube.
Double-Submerged Arc Welding: A longitudinal multi-wire submerged arc welding technique is used to simultaneously weld the inner and outer welds, with a penetration depth of ≥1.5 mm.
Hot Rolling Control: The hot rolling process during forming ensures the pipe body strength meets a yield strength of ≥310 MPa.
- Quality Inspection
Weld Inspection: 100% automatic ultrasonic testing is performed, and X-ray inspection is conducted at the intersection of the steel strip butt welds and spiral welds.
Hydrostatic Testing: Each pipe undergoes hydrostatic testing, and the pressure data is automatically recorded.
Pipe End Machining: Mechanical processing controls the end face perpendicularity and bevel angle accuracy.
- Finished Product Treatment
Qualified pipes are coated with anti-rust oil, marked according to standards, and must meet the mechanical performance requirements of a tensile strength of ≥455 MPa for ASTM A252 GR3 spiral welded pipes.
