ASTM A500 Seamless Carbon Steel Structural Tubing
Features
- Seamless construction available for structural applications requiring tubing without a longitudinal weld seam
- Round, square, and rectangular profiles for different structural designs
- Multiple grades to meet specified strength and fabrication requirements
- Cold formed dimensions designed for consistent structural fit and assembly
- Suitable for welding, riveting, and bolted connections using appropriate design and fabrication procedures
- Dimensional inspection and mechanical testing according to the applicable ASTM requirements
- Specified lengths, wall thicknesses, and end preparation options for project needs
Specifications
| Parameter | Specification |
|---|---|
| Standard | ASTM A500/A500M |
| Grades | Grades A, B, C, and D, subject to product form and applicable edition |
| Manufacturing Process | Cold formed seamless or welded structural tubing |
| Outside Dimensions | Round, square, rectangular, or specified special shapes within the standard’s dimensional limits |
| Wall Thickness | Specified wall thickness up to 25.4 mm, subject to the applicable edition and product size |
| Length | Random, multiple, or specified lengths as agreed in the order |
| Ends | Square cut or otherwise prepared as specified, with burr removal according to order requirements |
| Surface Finish | Workmanlike finish free from defects that interfere with the intended use |
| Testing | Tension testing, flattening testing for applicable round tubing, dimensional inspection, and manufacturing inspection according to the standard |
| Typical Use | Building frames, structural supports, bridges, machinery frames, and general structural fabrication |
Chemical Composition and Mechanical Properties
| Element | Grades B and D | Grade C |
|---|---|---|
| Carbon, heat analysis | 0.26% maximum | 0.23% maximum |
| Carbon, product analysis | 0.30% maximum | 0.27% maximum |
| Manganese, heat analysis | 1.35% maximum | 1.35% maximum |
| Manganese, product analysis | 1.40% maximum | 1.40% maximum |
| Phosphorus, heat analysis | 0.035% maximum | 0.035% maximum |
| Phosphorus, product analysis | 0.045% maximum | 0.045% maximum |
| Sulfur, heat analysis | 0.035% maximum | 0.035% maximum |
| Sulfur, product analysis | 0.045% maximum | 0.045% maximum |
| Copper, heat analysis | 0.20% minimum when specified | 0.20% minimum when specified |
| Copper, product analysis | 0.18% minimum when specified | 0.18% minimum when specified |
| Property | Grade B | Grade C | Grade D |
|---|---|---|---|
| Minimum Tensile Strength | 400 MPa | 427 MPa | 400 MPa |
| Minimum Yield Strength, Round Tubing | 290 MPa | 345 MPa | 250 MPa |
| Minimum Yield Strength, Square and Rectangular Tubing | 317 MPa | 345 MPa | 250 MPa |
| Elongation | Determined by specimen dimensions and wall thickness | Determined by specimen dimensions and wall thickness | Determined by specimen dimensions and wall thickness |
Use Case
- Building frames, columns, and structural support members
- Bridge components and general infrastructure frameworks
- Industrial equipment frames and machine supports
- Warehouse structures, platforms, and protective barriers
- Agricultural equipment and structural assemblies
- General fabrication requiring carbon steel structural tubing