What is the difference between Q235B steel plate and Q235A steel plate?

The difference between Q235A steel plate and Q235B steel plate is that they are both carbon steel. In the national standard GB700-88, the materials of Q235A steel plate and Q235B steel plate are mainly divided into the carbon content of steel. The material of Q235A steel plate is between 0.14 and 0.22%. The Q235A steel plate material is not impact tested. The steel material is Q235B steel plate normal temperature impact test, V-notch.

Relatively speaking, the mechanical properties of Q235B steel plate are much better than Q235A steel plate. Under normal circumstances, the steel plate is marked on the label before the finished product leaves the factory. The user can determine whether the material is Q235A steel plate, Q235B steel plate or other materials on the identification plate. Design pressure P≤1.6MPa; Operating temperature 0 ~ 350 ° C; Q235B steel plate thickness> = 20mm.