1. Material Overview
ASTM A847 rectangular tubes are high-strength, low-alloy structural tubing made from weather-resistant steel that forms a protective oxide patina when exposed to atmospheric conditions. This self-protecting characteristic provides superior corrosion resistance (2-4× conventional steel) while maintaining excellent structural performance.
2. Key Features & Benefits
✓ Advanced Weathering Properties: Develops stable rust patina that slows further corrosion
✓ High Strength: 50 ksi (345 MPa) minimum yield strength
✓ Low Maintenance: Eliminates need for protective coatings in most environments
✓ Structural Integrity: Excellent load-bearing capacity in harsh conditions
✓ Aesthetic Appeal: Distinctive rust-colored finish for architectural applications
3. Chemical Composition
| Element | Composition (%) | Effect |
|---|---|---|
| Carbon | ≤0.22 | Weldability |
| Copper | 0.20-0.40 | Corrosion resistance |
| Chromium | 0.30-1.25 | Patina formation |
| Phosphorus | ≤0.04 | Weathering |
| Silicon | 0.15-0.50 | Strength |
4. Mechanical Properties
• Yield Strength: 50 ksi (345 MPa) min
• Tensile Strength: 70 ksi (483 MPa) min
• Elongation: 21% min
• Hardness: ≤200 HB
5. Standard Sizes & Dimensions
| Size Range | Wall Thickness | Lengths |
|---|---|---|
| 1"×2" to 12"×24" | 0.125" to 1.0" | 20' or 40' standard |
| (25×50mm to 300×600mm) | (3-25mm) | (6-12m) |
6. Surface Treatment Options
Mill finish (natural weathering)
Pre-weathered surface
Shot blasted
Pickled and oiled
7. Fabrication Capabilities
• Welding: Compatible with all standard methods (SMAW, GMAW, FCAW)
• Cutting: Plasma, laser, waterjet, or saw cutting available
• Forming: Excellent cold-forming characteristics
• Machining: Requires carbide tooling for best results
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