What problems may appear in the use of Q345B steel plate?

1. Difficulties in forming Q345B steel plate
Q345B steel plate has weak plastic deformation, easy to crack during deformation, high deformation resistance, large resilience after forming, and poor precision of parts specification. According to the laser tailor welded blanks of Q345B steel plate, the position where the deformation is large is assumed by alloy steel or Q345B steel plate with good formability, while the position where the deformation is small or must bear a large load is assumed by Q345B steel plate with higher compressive strength.

2. Welding problems of Q345B steel plate
Because the production process technology is not the same, the addition of aluminum alloy elements also have different. When the cooling rate is low, it is necessary to add more aluminum alloy elements, but it will also cause the malignant change of welding characteristics. For Q345B steel plate coating products, the coating composition, microstructure and coating thickness all affect the welding characteristics.

3. Problems of Q345B steel plate spraying
The surface layer aggregation and air oxidation of aluminum alloy elements in Q345B steel plate affect its spraying characteristics. The coating composition and surface appearance also affect the spraying characteristics of raw materials. According to the control of atmosphere in the furnace during the whole process of heat treatment, the surface layer aggregation and air oxidation of aluminum alloy elements in Q345B steel plate are controlled, so as to improve the spraying characteristics of Q345B steel plate. Pickling passivation method was used to clean the aluminum alloy elements which diffused to the surface of the coating, and then electroplating process - extra thin nickel layer was used to improve the spraying characteristics.