Q345R Pressure Vessel Steel Plate
Q345 steel is an alternative to the old steel grades of 12MnV, 14MnNb, 18Nb, 16MnRE, 16Mn, etc., and it is not just a substitute for 16Mn steel. In terms of chemical composition, 16Mn and Q345 are also different. More importantly, there is a large difference in the thickness group size of the two steels according to the difference in yield strength, and this will inevitably cause a change in the allowable stress of the material of some thickness.