According to the new classification of "GB 713-2008 Steel Plates for Boilers and Pressure Vessels" implemented on September 1st, 2008, Grades 16Mng, 16MnR, and 19Mng are merged into Q345R grade. Q345R grade is ordinary low alloy steel, and is commonly used in boilers and pressure vessels. Its delivery condition is divided into hot rolled or normalized. Its performance is similar to that of Q345 (16Mn) (the yield strength of 16mm steel plate is greater than 345Mpa), the tensile strength is between (510-640), the elongation is greater than 21%, and the zero-degree V-shaped impact energy is greater than 34J. Q345R steel process reference standard is GB713-2014.
Q345R steel plate has good comprehensive mechanical properties and technological properties. The phosphorus and sulfur contents are slightly lower than the low-alloy high-strength steel plate Q345 (16Mn) steel. In addition to the increased tensile strength and elongation requirements compared with Q345 (16Mn) steel, it also requires the guarantee of impact toughness. Q345R steel is currently the most widely used and most used steel plate for pressure vessels in China.
The elements of niobium, vanadium, and titanium can be added to the Q345R steel plate, and their contents should be filled in the quality certificate. The sum of the contents of the above three elements should not be greater than 0.050%, 0.10%, 0.12%.
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