Q345 is a kind of low alloy steel that is widely used in bridges, vehicles, ships, buildings, pressure vessels, special equipment, etc., where "Q" means yield strength, and 345 means that the yield strength of this steel is 345MPa.
The testing of q345 steel mainly includes two aspects: first, whether the element content of the steel reaches the national standard; second, whether the yield strength, tensile test, etc. of the steel meet the standards through professional institutions. It has a different alloy content from q235, which is ordinary carbon steel and q345 is low alloy steel.
Classification of Q345 materials
Q345 can be divided into Q345A, Q345B, Q345C, Q345D and Q345E according to the grade. What they represent is mainly that the temperature of the impact is different. Q345A level, no impact; Q345B level, 20 degree normal temperature impact; Q345C level, 0 degree impact; Q345D level, -20 degree impact; Q345E level, -40 degree impact. At different impact temperatures, the impact values are also different.
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The use of Q345 material
Q345 has good comprehensive mechanical properties, acceptable low temperature performance, good plasticity and weldability. It is used as medium and low pressure vessels, oil tanks, vehicles, cranes, mining machinery, power stations, bridges and other structures, mechanical parts, building structures, and general structures that bear dynamic loads. Metal structural parts, used in hot-rolled or normalized conditions, can be used for various structures in cold areas below -40°C.