ASTM A500 vs. A513 Tubing
Bottom line: A500 is generally selected for structural tubing while A513 covers electric-resistance-welded mechanical tubing. The intended structural/mechanical function should drive the specification.
| Decision factor | Option A | Option B |
|---|---|---|
| Focus | Structural tubing | Mechanical tubing |
| Design use | Structural members when specified | Mechanical/fabricated components when specified |
| Ordering priority | Section dimensions, grade, design requirements | Type, chemistry/mechanical requirements, dimensions and finish |
How to choose
Do not substitute one material for another only because the dimensions look similar. The governing specification, design assumptions, service environment, fabrication method, coating, pressure/load requirements and owner or engineer approvals control the final choice.
Send a cleaner RFQ
Send both the required specification and the performance/application requirements if substitutions are being considered.
Reference starting point: AISC resources and current ASTM specifications. Always verify the current governing standard, approved project specification and manufacturer documentation before final procurement.