S690QL (High-Strength Quenched and Tempered Structural Steel) S690QL is a high-strength, quenched and tempered structural steel grade defined under EN 10025-6, designed for demanding load-bearing applications. With a minimum yield strength of 690 MPa, it combines exceptional strength, structural integrity, and impact resistance, making it ideal for industries where weight reduction and durability are crucial. This steel grade is optimized for heavy-duty construction, load-bearing frames, transport equipment, and lifting machinery. Despite its high strength, S690QL maintains good weldability and machining characteristics when proper procedures are followed. Key Features: High yield strength for lightweight, load-efficient structures Excellent toughness and impact resistance at low temperatures (down to -40°C) Good weldability with appropriate procedures and consumables Superior fatigue resistance for dynamic or repetitive stress conditions Common Applications: Structural frameworks for bridges and buildings Crane booms, lifting arms, and heavy trailers Offshore platforms and wind turbine foundations Mining equipment, tippers, and chassis components