Q345B Low Alloy High-Strength Steel Analysis

Q345B is a popular Chinese low alloy high-strength structural steel. It is known for its excellent strength-to-weight ratio, good welding performance, and strong toughness.

Its chemical composition includes carbon (≤0.20%), manganese (1.0–1.6%), silicon (0.4–0.6%), with trace alloying elements like vanadium, niobium, and titanium. These micro-alloying elements significantly improve mechanical performance.

Q345B is supplied in hot-rolled or normalized delivery states, offering improved strength and reliability.

Applications include bridges, high-rise buildings, heavy machinery, cranes, mining equipment, and pressure vessels.