What is the Q345 heavy plate?

Q345 heavy plate is a low alloy steel (C <0.2%) and is widely used in construction, bridges, vehicles, ships, pressure vessels. Q stands for the yield strength of this material. The number 345 refers to the yield value of this material, which is around 345 MPa. And as the thickness of the material increases, its yield value decreases. 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 that bear dynamic loads, mechanical parts, building structures, and general. Metal structural parts, used in hot rolled or normalized state, can be used for various structures in cold areas below -40 ° C.

Q345 medium and heavy plate has good comprehensive mechanical properties, low temperature performance, and 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 that bear dynamic loads, mechanical parts, and construction. Structure, general metal structure, hot rolled or normalized, can be used for various structures in cold areas below -40 ℃.

Q345 Steel VS 16Mn steel

The proportion of main constituent elements in Q345 heavy plate is basically the same as that of 16Mn steel, with the difference that V, Ti, Nb trace alloy elements are added. A small amount of V, Ti, and Nb alloy elements can refine the grains, greatly improve the toughness of the steel, and greatly improve the comprehensive mechanical properties of the steel. Because of this, the thickness of the steel plate can be made larger. Therefore, the comprehensive mechanical properties of Q345 steel should be better than 16Mn steel, especially its low temperature performance is not available in 16Mn steel. The allowable stress of Q345 steel is slightly higher than that of 16Mn steel.