What kind of steel is Q345B?

Q345B 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 this kind of 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 value of the steel, the unit is MPa, 345 means that the yield value of the steel of this material is about 345MPa, and the yield value will decrease with the increase of the thickness of the material; B refers to the steel The quality level is B.

The characteristics of Q345B steel are good comprehensive performance, good low temperature performance, cold stamping performance, good welding performance and machinability. Widely used in bridges, vehicles, ships, buildings, pressure vessels, etc.

Q345B steel is a low carbon alloy steel with carbon content less than 0.2% marked. Carbon steel for special purposes, such as bridge steel, marine steel, etc., basically adopts the representation method of carbon structural steel, but the letter indicating the purpose is added at the end of the steel number.