What is the difference between Q345B steel and Q345R plate?

Q345B steel plate is mainly used in bridges, vehicles, ships, buildings, pressure vessels, etc. Q345R plate is currently the most widely used and most used steel plate for pressure vessels in China.

Difference in material

Q345B material is a low-carbon alloy steel (c <0.2%), with good overall performance, low temperature performance, cold stamping performance, welding performance and machinability.=

Q345R material is a special plate for pressure vessels with a yield strength of 345MPa. It has good comprehensive mechanical properties and technological performance. In addition to the tensile strength and elongation requirements higher than Q345 (16Mn) steel, it is also required to ensure impact toughness.