Q345D A Reliable Steel Grade for Low-Temperature Environments

Q345D is a high-strength low-alloy steel designed to maintain excellent impact toughness at -20°C. Its chemical composition is similar to Q345B, including microalloy elements such as Nb, V, and Ti, but with enhanced control of cleanliness and toughness during production.

Delivery conditions include hot-rolled, normalized, or controlled-rolled states. Controlled rolling and cooling refine grains and improve low-temperature performance.

Q345D is widely used in low-temperature construction, bridges, pressure vessels, storage tanks, offshore platforms, and port structures. Its dependable performance in cold climates makes it essential for engineering projects in harsh environments.