what is astm a500 grade c hollow section
ASTM A500 Grade C hollow structural tube is a high-strength structural carbon steel tube made by cold bending according to American standards. It is specially designed for heavy-duty building frames, bridge supports and other load-bearing scenarios.
A500 GrC hollow section specification
1. Side Length Range:
- Small square tubes: 1/2 inch (12.7mm) - 4 inches (101.6mm), mostly used for furniture and decorative framing.
- Medium square tubes: 5 inches (127mm) - 8 inches (203.2mm), suitable for building curtain walls and machinery support.
- Large square tubes: 10 inches (254mm) and above, mainly used for bridges and heavy steel structures.
2. Wall Thickness Parameters: Standard wall thickness varies from 0.065 inches (1.65mm) to 0.5 inches (12.7mm). For example: - Common wall thicknesses for 2×2 inch square tubes are 1/8 inch (3.2mm) and 3/16 inch (4.8mm). - Wall thicknesses for 6×6 inch square tubes are typically 1/4 inch (6.4mm) and above.
3. Tolerance Standards: - Side length tolerance: ±0.5% or ±0.01 inches (whichever is greater). - Wall thickness tolerance: ±10% (for wall thicknesses ≥0.9mm). - Length tolerance: within ±1/8 inch (3.2mm).
Chemical Requirements of ASTM A500 Grade C
| Element | ASTM A500 Grade C |
|---|---|
| Product Analysis | |
| Carbon, max | 0.27 |
| Manganese, max | 1.4 |
| Phosphorus, max | 0.045 |
| Sulfur, max | 0.045 |
| Copper, when copper steel is specified, min | 0.18 |
| a. ASTM A500 Grade C Properties for each reduction of 0.01 percentage point below the specified maximum for carbon, an increase of 0.06 percentage point above the specified maximum for manganese is permitted, up to a maximum of 1.50% by heat analysis and 1.60% by product analysis. | |
| b. If copper-containing steel is specified in the purchase order. | |
ASTM A500 Gr.C Carbon Steel Mechanical Properties
| ASTM A500 Gr. C properties | ||
|---|---|---|
| Wall Thickness | ±10% | |
| Squareness of Sides | 90°±2° | |
| External Corner Radius | R≤3WT | |
| Twist | H≤38.1mm | ±1.3mm/1m length |
| 38.1mm＜H≤63.5mm | ±1.6mm/1m length | |
| 63.5mm＜H≤101.6mm | ±1.9mm/1m length | |
| 101.6mm＜H≤152.4mm | ±2.2mm/1m length | |
| 152.4mm＜H≤203.2mm | ±2.5mm/1m length | |
| H>203.2mm | ±2.8mm/1m length | |
| Straightness | 10.4mm/1000mm in length | |
| Length | +50mm/-0mm | |
What is the difference between A500 GrC and GrB
| Feature | Grade B (Gr B) | Grade C (Gr C) |
|---|---|---|
| Yield Strength | ≥ 315 MPa (45,000 psi) | ≥ 345 MPa (50,000 psi) |
| Tensile Strength | 380-550 MPa (55,000-79,800 psi) | 450-620 MPa (65,300-89,900 psi) |
| Primary Use | Light structural applications (e.g., non-critical frames, fencing) | Heavy-duty structural applications (e.g., building columns, bridge supports) |
| Cost | Lower (due to lower material strength requirements) | Slightly higher (due to higher strength and quality control) |
A500 GRC Hollow Section factory
