A514 High-Yield Structural Steel Coil: Premium Quenched & Tempered Steel for Heavy-Duty Construction
Product Overview
ASTM A514 carbon steel coil is a quenched and tempered high-strength steel offering 690 MPa minimum yield strength across Grades A-T, compliant with ASTM A514, EN 10025-6 S690QL, and GB/T 16270 Q690D standards. Designed for cranes, mining rigs, and military vehicles, this steel delivers 760–895 MPa tensile strength and 18% elongation despite extreme thicknesses (up to 150mm). With controlled carbon equivalents (CEV: 0.42–0.55), it outperforms conventional steels like A572 in load-to-weight ratios while maintaining -40°C impact toughness.
Key Technical Specifications
1. Production & Dimensions
- Process:
- Hot-rolled: 2.75–150mm thickness (±1.2% tolerance)
- Cold-rolled: 0.2–3mm thickness (±0.4% tolerance)
- Width: 45–2,200mm (optimized for laser/plasma cutting)
- Surface: Mill scale (Ra 12.5µm), wire-drawn (Ra 3.2µm), or laminated film (salt spray resistance)
2. Chemical Composition
| Grade | C | Mn | Cr | Mo | Ni | P (≤) | S (≤) |
|---|---|---|---|---|---|---|---|
| A | 0.15–0.21% | 0.80–1.10% | 0.50–0.80% | 0.18–0.28% | – | 0.035% | 0.035% |
| B | 0.12–0.21% | 0.70–1.00% | 0.40–0.65% | 0.15–0.25% | – | 0.035% | 0.035% |
| E | 0.12–0.20% | 0.40–0.70% | 1.40–2.00% | 0.40–0.60% | – | 0.035% | 0.035% |
| F | 0.10–0.20% | 0.60–1.00% | 0.40–0.65% | 0.40–0.60% | 0.70–1.00% | 0.035% | 0.035% |
Trace elements: Cu ≤0.35%, V ≤0.05%
Mechanical Properties
| Thickness Range (mm) | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Charpy Impact (-40°C) |
|---|---|---|---|---|
| ≤20 | 690 | 760–895 | 18 | 45J |
| 20–65 | 690 | 760–895 | 18 | 40J |
| 65–150 | 620 | 690–895 | 18 | 35J |
Tested per ASTM A370 (longitudinal specimens)
Performance Advantages
- Strength-to-Weight Ratio:
- 40% lighter vs. A36 steel at equivalent load capacity (Grade B, 20mm thickness).
- Bend radius: 3× thickness (ASTM A6/A6M for cold-forming).
- Weldability & Fabrication:
- Preheating required above 25mm thickness (AWS D1.1/D1.5 compliant).
- Submerged arc welding (SAW) recommended for joints >50mm.
- Low-Temperature Toughness:
- -40°C impact energy: 35–45J (ISO 148-1 standard).
- Ideal for Arctic oil rigs and cryogenic storage.
- Corrosion Resistance:
- Atmospheric corrosion rate: 0.045 mm/year (ISO 9223 C4 environments).
- Compatible with thermal spray aluminum (TSA) coatings.
Applications by Grade
| Grade | Industry | Use Case |
|---|---|---|
| A | Mining | Dragline excavator booms |
| E | Defense | Armored vehicle chassis |
| F | Energy | Offshore wind turbine foundations |
| T | Civil Eng. | Suspension bridge components |
Global Equivalents
| ASTM A514 | EN 10025 | JIS G3106 | GB/T 16270 |
|---|---|---|---|
| Grade B | S690QL | SM570 | Q690D |
| Grade F | S890QL | – | Q890E |
Sustainability & Compliance
- Recycled Content: 87% (mill-certified)
- RoHS Compliance: Lead <0.01%, Mercury-free
- CE Marking: EN 1090-1 (Execution Class 3)
Packing And Delivery
