Q345B steel is a grade B low carbon alloy steel. Its main features are good comprehensive performance, good low temperature performance, cold stamping performance, good welding performance and machinability. And the yield value of Q345B steel decreases as the thickness of the material increases, and it is mainly used in the manufacture of bridges, vehicles, ships, buildings, pressure vessels, etc.
In Q345B steel, Q refers to the yield strength of the steel; 345 means that the min. yield value of Q345B material is about 345MPa. The yield value decreases with the increase of Q345B plate thickness ; B means that the quality grade of the steel is B.
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