Technical specifications for hot-rolled flat structural steel products with high yield strength in quenched and tempered states

This specification details the technical delivery conditions for hot-rolled flat structural steels supplied in a quenched and tempered state. It defines the mechanical properties, primarily yield strength, ultimate tensile strength, and low-temperature impact energy, required for high-stress applications. The rapid cooling followed by controlled heating yields a fine-grained martensitic or bainitic microstructure, providing an elevated strength-to-weight ratio while maintaining specified weldability and formability limits. These materials are utilized in heavy lifting equipment, heavy machinery, crane booms, and other items where the strength and mass are important engineering constraints.

Flat structural products of high strength quenched and tempered steels. Covers high-performance engineering grades including S460Q, S500Q, S550Q, S620Q, S690Q, S890Q, and S960Q.