S690QL is a type of high-strength steel plate that is commonly used in structural applications. Here are some key properties and characteristics of S690QL steel: - S690QL is a high-strength, low-alloy (HSLA) steel plate - It has a minimum yield strength of 690 MPa (100 ksi) - It has a tensile strength of 770-940 MPa (112-136 ksi) - It has a high level of toughness, with a Charpy impact test value of 40 J (29 ft-lb) at -40°C (-40°F) - It has good weldability and is suitable for welding with common welding processes - It is often used in applications such as: - Heavy construction equipment - Cranes and lifting equipment - Bridges and high-rise buildings - Offshore platforms and wind turbines - Mining and quarrying equipment S690QL steel is known for its excellent strength-to-weight ratio, making it a popular choice for applications where high strength and low weight are critical. It is also known for its good corrosion resistance and ability to withstand harsh environments. Note: The "QL" in S690QL stands for "Quenching and Tempering", which is a heat treatment process that enhances the steel's mechanical properties.