ASTM A573/A573M Carbon Steel Coil: High-Toughness Structural Steel for Critical Applications
Product Overview
ASTM A573/A573M carbon steel coil is a carbon-manganese-silicon structural steel available in Grades 58, 65, and 70, compliant with ASTM A573M, EN 10025-2 S355J0, and JIS G3106 SM570. Designed for welded bridges, pressure vessels, and industrial machinery, this steel delivers 220–290 MPa yield strength and 20–28% elongation while excelling in room-temperature notch toughness (Charpy V-notch: 27J at -20°C). Its controlled 0.23–0.28% carbon content ensures superior weldability compared to high-carbon steels like A516.
Key Technical Specifications
1. Production & Dimensions
- Process:
- Hot-rolled: 0.1–400mm thickness (±1% tolerance)
- Cold-rolled: 0.1–3mm thickness (±0.3% tolerance)
- Width: 100–3,000mm (ideal for CNC plasma/waterjet cutting)
- Surface: Mill scale (Ra 10µm), wire-drawn (Ra 2.5µm), or laminated film (anti-corrosion)
2. Chemical Composition
| Grade | C (≤) | Mn | Si | P (≤) | S (≤) | CEV (IIW) |
|---|---|---|---|---|---|---|
| 58 | 0.23% | 0.60–0.90% | 0.10–0.35% | 0.035% | 0.040% | 0.37 |
| 65 | 0.26% | 0.85–1.20% | 0.15–0.40% | 0.035% | 0.040% | 0.42 |
| 70 | 0.28% | 0.85–1.20% | 0.15–0.40% | 0.035% | 0.040% | 0.46 |
Trace elements: Cu ≤0.35%, Cr ≤0.15%, Ni ≤0.25%
Mechanical Properties
| Grade | Yield Strength | Tensile Strength | Elongation (%) | Hardness (HB) |
|---|---|---|---|---|
| 58 | 220 MPa | 400–490 MPa | 21 | 150–180 |
| 65 | 240 MPa | 450–530 MPa | 20 | 170–200 |
| 70 | 290 MPa | 485–620 MPa | 28 | 190–220 |
Tested per ASTM A370 (transverse specimens)
Performance Advantages
- Notch Toughness:
- Charpy V-notch impact: 27J at -20°C (Grade 58, 25mm thickness).
- Bend radius: 2.5× thickness (ASTM A6/A6M for cold-forming).
- Weldability & Fabrication:
- Carbon Equivalent (CEV): 0.37–0.46 (IIW formula) minimizes preheating requirements.
- Recommended welding: SMAW (AWS E7018) for thicknesses >30mm.
- Thermal Stability:
- Thermal conductivity: 49 W/m·K (20°C)
- Coefficient of expansion: 11.7 µm/m°C (20–200°C)
- Corrosion Resistance:
- Atmospheric corrosion rate: 0.065 mm/year (ISO 9223 C2 environments).
- Compatible with hot-dip galvanizing (610g/m² coating weight).
Applications by Grade
| Grade | Industry | Use Case |
|---|---|---|
| 58 | Civil Eng. | Bridge girders, crane runways |
| 65 | Energy | Wind turbine towers, pressure vessels |
| 70 | Defense | Armored vehicle components, shipbuilding |
Global Equivalents
| ASTM A573 | EN 10025 | JIS G3106 | GB/T 1591 |
|---|---|---|---|
| Grade 58 | S355J0 | SM490A | Q345D |
| Grade 70 | S420ML | SM570 | Q390E |
Sustainability & Compliance
- Recycled Content: 85% (mill-certified)
- RoHS Compliance: Lead <0.01%, Mercury-free
- CE Marking: EN 1090-1 (Execution Class 3)
Packing And Delivery
