ASTM A500 Grade B: Cold-Formed Structural Tubing
ASTM A500/A500M · Published: 2026-05-25 · Updated: July 2026
ASTM A500 Grade B is the standard specification for cold-formed welded and seamless carbon steel structural tubing used in construction, machinery, and architectural applications. With 315 MPa minimum yield strength in round sections (higher in...
ASTM A500 Grade B is the standard specification for cold-formed welded and seamless carbon steel structural tubing used in construction, machinery, and architectural applications. With 315 MPa minimum yield strength in round sections (higher in square/rectangular due to cold work), it bridges the gap between hot-rolled sections and higher-cost mechanical tubing. The cold-forming process increases strength through work hardening while maintaining excellent weldability. Commonly used for building columns, trusses, sign supports, and agricultural equipment frames.
Quick Facts
| Category | Carbon Steel |
| Standard | ASTM A500/A500M |
| Density | 7.85 g/cm³ |
| Yield Strength | 315 MPa (46 ksi) |
| Tensile Strength | 400 MPa (58 ksi) |
Global Equivalents & Cross-Reference
| Alternative Standard / Grade | Action |
|---|---|
| S275J0H | Compare |
| Q275 | Compare |
| STKR400 | Compare |
| E275 | Compare |
| C350 | Compare |
Related Materials
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Frequently Asked Questions
Can A500 Gr B tubing be hot-dip galvanized?
Yes, A500 Gr B is routinely hot-dip galvanized. The silicon content should ideally be below 0.04% or between 0.15-0.25% for optimal coating thickness and appearance. Silicon levels of 0.04-0.15% can produce excessively thick, dark, and brittle galvanized coatings. If galvanizing is planned, specify the silicon range to the mill or service center.
References & International Standards
- ASTM International. Standard Specifications for Steel & Metal Alloys. astm.org
- International Organization for Standardization (ISO). Metallic Materials — Cross-Reference Database. iso.org
- American Iron and Steel Institute (AISI). Steel Grade Designations & Equivalents. steel.org
- European Committee for Standardization (CEN). EN Steel Standards & Numbering System. cencenelec.eu