Q345D steel plate belongs to low alloy high strength steel under standard GB/T3274 or GB/T1591. P < 0.030% and S < 0.025% are executed for Q345D steel plates, and the Q345D steel plate is subjected to impact test at - 20℃.
Q345R steel plate is a kind of steel for boiler and pressure vessel. The standard of Q345R steel plate is GB713, P < 0.025%, S < 0.015%. The Q345R steel plate is subject to impact test at 0℃.
There are some differences between Q345D steel plate and Q345R steel plate in other chemical compositions such as C, Mn, Si, etc. We can compare the two standards an learn more about their difference. In the whole, the quality of Q345R steel plate is better than that of Q345D steel plate.
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