Why do boiler plates require good impact toughness?

    Boiler plates are made by rolling in a rolling mill under hot conditions. The steel plate is a deformable metal, and the plasticity increases with increasing temperature. As a result, the mechanical and physicochemical properties of the steel sheet are constantly changing to increase rigidity, strength, and dirtiness. Reduced plasticity and feed resistance. This phenomenon occurs, which is unfavorable for the use of boiler steel plates, and should be recrystallized at 450 ° C. The upper and lower tube plates of the boiler are 1200-1300 ℃, and the welds of the steel plates should be preheated.