material Q345 steel has good comprehensive mechanical properties, acceptable low temperature properties, and good plasticity and weldability.
material Q345 steel is mainly used for medium and low pressure vessels, oil tanks, vehicles, cranes, mining machinery, power stations, bridges and other structures, mechanical parts, building structures, andgeneral metal structural parts that are subjected to dynamic loads.
material Q345 steel can be used in various structures in cold regions below -40°C.
material Q345 steel can be divided into Q345A, q345b, Q345C, Q345D, Q345E by grade. What they represent is mainly that the temperature of the shock is different.
Q345A grade, is no impact;
Q345B grade, is 20 degrees normal temperature impact;
Q345C grade, is 0 degree shock;
Q345D grade, is -20 degree impact;
Q345E grade, is -40 degree impact.
At different shock temperatures, the value of shock is also different.
chemical composition
Q345A: C≤0.20, Mn≤1.7, Si≤0.55, P≤0.045, S≤0.045, V 0.02~0.15;
Q345B: C≤0.20, Mn≤1.7, Si≤0.55, P≤0.040, S≤0.040, V 0.02~0.15;
Q345C: C≤0.20, Mn≤1.7, Si≤0.55, P≤0.035, S≤0.035, V 0.02~0.15, Al≥0.015;
Q345D: C≤0.20, Mn≤1.7, Si≤0.55, P≤0.030, S≤0.030, V 0.02~0.15, Al≥0.015;
Q345E: C≤0.20, Mn≤1.7, Si≤0.55, P≤0.025, S≤0.025, V 0.02~0.15, Al≥0.015;
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