Q345A, no impact Q345B, impact at 20 ° normal temperature Q345C, 0 degree impact Q345D, is – 20 degree impact Q345E, is – 40 degree impact. What they represent is that the impact temperature is different. Q345 can be divided into Q345A, Q345B, Q345C, Q345D and Q345E by grade. bearing dynamic load for medium and low pressure vessels, oil tanks, vehicles, cranes, mining machinery, power stations, bridges, etc Used in rolling or normalizing state, it can be used for various structures in cold area below – 40 ℃. It is used as the structure, mechanical parts, building structure, general metal structural parts, heat, etc. Q345 has good comprehensive mechanical properties, low temperature performance, good plasticity and weldability. The yield value will decrease with the increase of material thickness. The latter 345 is the yield value of this material, which is about 345 MPa. Q stands for the yield strength of this material. It is a low alloy steel (C < 0.2%), widely used in construction, bridges, vehicles, ships, pressure vessels, etc.
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