S690QL – High-Strength Quenched and Tempered Structural Steel S690QL is a high-yield strength structural steel grade, produced through quenching and tempering, offering an exceptional combination of strength, toughness, and weldability. With a minimum yield strength of 690 MPa, it is ideal for use in load-bearing structures, heavy machinery, and engineering components where weight reduction without sacrificing performance is essential. Compliant with EN 10025-6, S690QL is widely used across construction, mining, transport, and energy sectors, especially in applications demanding high load capacity and superior structural performance. Key Features: High Yield Strength (≥ 690 MPa): Allows for lighter and more compact designs without compromising structural integrity. Excellent Toughness at Low Temperatures: Designed to perform reliably even in sub-zero environments, typically tested at -40°C. Good Weldability with Proper Procedures: Despite its high strength, S690QL maintains good weldability using controlled heat input and suitable filler materials. Superior Fatigue and Impact Resistance: Well-suited for dynamic load applications like cranes, bridges, and trailers. Mechanical Properties Overview: Property S690QL Yield Strength ≥ 690 MPa Tensile Strength 770–940 MPa Elongation ≥ 14% Impact Energy ≥ 30 J at -40°C (Charpy V-Notch) Delivery Condition Quenched and Tempered Common Applications: Lifting and material handling equipment (e.g., cranes, hoists) Offshore structures and shipbuilding Mining equipment and dump bodies Structural parts in bridges, towers, and buildings Truck frames, trailers, and chassis systems Conclusion: S690QL is an ideal solution for industries requiring high strength, weight efficiency, and durability under stress. With excellent mechanical properties and processing performance, it supports modern engineering applications that demand reliability, safety, and structural economy.