S690QL (High-Strength Quenched and Tempered Structural Steel Plate) S690QL is a high-strength, quenched and tempered structural steel plate designed for heavy-duty applications that demand superior load-bearing capacity and reduced weight. With a minimum yield strength of 690 MPa, S690QL provides exceptional strength-to-weight performance, making it ideal for critical structural components in industries such as construction, mining, transport, and energy. Manufactured in compliance with EN 10025-6 standards, S690QL offers excellent toughness, weldability, and impact resistance—even at low temperatures—allowing for reliable performance in challenging environments. Key Features: High Yield Strength (≥ 690 MPa): Allows for lighter, more efficient structures without compromising load capacity or safety. Excellent Weldability: Optimized chemical composition ensures good weldability with proper preheating and post-weld treatment when needed. Superior Impact Toughness: Guaranteed impact energy of ≥ 30 Joules at -40°C (Charpy V-notch test), ideal for cold climates and dynamic loading conditions. Quenched and Tempered for Uniform Performance: Heat-treated to deliver consistent strength, toughness, and ductility across the plate thickness. Dimensional and Surface Accuracy: Available in various thicknesses with tight tolerances, suitable for precision engineering and fabrication. Mechanical Properties of S690QL: Property Typical Value Yield Strength ≥ 690 MPa Tensile Strength 770–940 MPa Elongation ≥ 14% Impact Energy ≥ 30 J at -40°C Standard EN 10025-6 Common Applications: Heavy Construction Equipment: Booms, chassis, and frames of cranes, excavators, and loaders. Bridges and Structural Engineering: Load-bearing beams, trusses, and box girders in bridge construction and tall buildings. Transport and Haulage: Trailers, tippers, and containers designed to reduce vehicle weight and increase payload. Offshore and Energy Sectors: Structural supports, wind turbine towers, and platform components. Mining and Earthmoving Machinery: Structural elements in dump trucks, bulldozers, and drilling rigs exposed to dynamic loads and harsh environments. Conclusion: S690QL combines high strength, excellent toughness, and good weldability in a single, high-performance plate solution. Whether you're building next-generation infrastructure or optimizing heavy machinery, S690QL allows for innovative designs that are stronger, lighter, and more efficient—without compromising safety or performance.