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ASTM A500 Grade B is a standard for cold-formed welded and seamless carbon steel structural materials that is very common in building, bridge and various structural applications. It is favored for its high strength, good processability and economy.
the main characteristics of ASTM A500 Gr.B:
| Characteristic dimension | Detailed description of the ASTM A500 Grade B |
| Standard Name | ASTM A500 - Standard Specification for Cold-formed welded and Seamless Carbon Steel Square, Rectangular and Circular Structured tubes |
| Main Grade | Grade B (with additional grades A, C, and D. Grade B strikes a good balance among strength, processability, and cost). |
| Chemical composition | carbon (C) of 0.26% or less, manganese (Mn) 1.35% or less, phosphorus (P) 0.035% or less, sulfur (S) of 0.035% or less, copper (Cu, when specified) 0.20% or higher |
| Mechanical properties |
Square/rectangular tubes: Yield strength ≥46,000 psi (317 MPa), tensile strength ≥58,000 psi (400 MPa), elongation (2 inches gauge length)≥23%; round tubes: Yield strength ≥42,000 psi (290 MPa), tensile strength ≥58,000 psi (400 MPa) |
| Main manufacturing processes | It include high-frequency resistance welding (ERW) process, and seamless process can also be adopted. Cold forming improves mechanical properties and dimensional tolerances. Welded pipes usually need to undergo heat treatment to ensure the strength of the weld seam. |
|
Size and shape |
Round, square, rectangular. Common size ranges: Square tubes such as 20×20mm to 500×500mm, rectangular tubes such as 20×40mm to 300×500mm, with wall thickness commonly ranging from 1.0mm to 20mm |
| Dimensional tolerance | Outer diameter/outer dimension: ±0.75% <br> Wall thickness: ±10% <br> Length (fixed length) : ±0.125 inches |
| Density | approximately 7850 kg/m³ (0.284 lb/in³) |
| Surface treatment | The is usually black skin (without coating), but it can also be carried out by hot-dip galvanizing (zinc coating 200-600g/m²), oiling, painting, etc. according to requirements. |
| Main application fields | It include building structures (venues, high-rise buildings), Bridges, transmission towers, communication towers, vehicle frames, mechanical equipment supports, fences and guardrails, agricultural greenhouses, etc. |
🔧Manufacturing and quality
ASTM A500 Gr.B steel pipes are mainly manufactured by the high-frequency resistance welding (ERW) process, and the seamless process can also be adopted. The cold forming process helps to improve its mechanical properties and enhance dimensional tolerances. For welded pipes, heat treatment is usually required to ensure that the weld seam has sufficient strength.
Many manufacturers have passed quality management system certifications such as ISO 9001, and their products are usually subject to third-party inspections such as SGS and BV to ensure that the quality meets the standard requirements.
💡 Selection and application suggestions
1. Give priority to welded pipes (ERW) :
For most structural applications, ERW pipes are fully sufficient and more cost-effective.
2. Emphasize anti-corrosion:
If used in a humid environment or outdoors, hot-dip galvanizing surface treatment is one of the most common and effective anti-corrosion options.
3. Clarify requirements:
When inquiring about prices or placing orders, clearly state the shape, precise dimensions (outer diameter/side length and wall thickness), length, surface treatment method, quantity and execution standards of the required steel pipes. This can help you obtain more accurate quotations and more suitable products.
4. Request quality guarantee documents:
When purchasing, ask the supplier to provide material certification (MTC) or relevant third-party inspection certificates (such as SGS, BV). This is an important step to ensure that the product quality complies with the ASTM A500 Gr.B standard.
⚠️ Notes
• Market grade differences:
Please note that the ASTM A500 standard includes multiple grades such as A, B, C, and D, and their mechanical property requirements are different. When making a purchase, it is necessary to clearly specify the required grade as Gr.B.
• Standard Update:
ASTM standards are updated irregularly. For key projects, it is recommended to obtain and consult the latest official version of ASTM A500 standard to confirm all technical requirements.
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