What is material Q345B

The strength and toughness of material Q345B are improved by adding trace alloying elements and adopting controlled rolling and cooling process to refine grains. In the process of continuous casting and rolling, some alloying elements will appear at grain boundaries in the form of precipitates, which will reduce the thermoplasticity of material Q345B, and lead to surface transverse cracks, corner cracks and other surface quality defects of slabs.

With the continuous development of China's economic construction, the application of low-alloy and high-strength structural steel is more and more extensive, and material Q345B is one of the most productive low-alloy steels in China. Material Q345B has high strength, high toughness, impact resistance, corrosion resistance and other excellent properties. Eliminating slab defects in actual production process and improving slab quality is foundation to guarantee good comprehensive performance.