Q345 steel has good comprehensive mechanical properties, good low temperature performance, good plasticity and weldability. Q345 steel is used for medium and low pressure containers, oil tanks, vehicles, cranes, mining machinery, power stations, bridges and other dynamic load-bearing structures, mechanical parts, building structures, and general metal structural parts.
Q345 steel is used in hot rolling or normalizing state, and can be used in various structures in cold regions below -40°C.
Q345 steel can be divided into Q345A, q345b, Q345C, Q345D, Q345E according to grade. What they represent is mainly the temperature of the shock.
Q345A level, no impact;
Q345B level, 20 degrees normal temperature impact;
Q345C level, is 0 degree impact;
Q345D level, is -20 degree impact;
Q345E level, is -40 degree impact.
At different shock temperatures, the shock values are 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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