Q345B A Classic High-Strength Low-Alloy Steel

Q345B is a widely used high-strength low-alloy structural steel under GB/T 1591, featuring a yield strength of about 345 MPa. It offers excellent weldability, a strong strength-to-weight ratio, and good impact toughness. Its composition includes low carbon with Mn, Si, Nb, V, and Ti microalloy additions.

Delivery conditions include hot-rolled, normalized, or controlled-rolled. Controlled rolling produces refined grain structures, enhancing mechanical properties.

Q345B is applied in building structures, bridges, vehicle components, boilers, and pressure vessels. Its excellent balance of strength and weldability makes it a popular choice in many engineering fields.

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