Abstract: An experiment research on the Ti-microalloyed container plate Q345R was conducted to test its mechanical properties,microstructures and precipitates.The results show that the tested steel has good strength,ductility,and low-temperature impact toughness.The misconstrues of the steel are composed of ferrite and pearlite with the grain size of grade 12 or so.The precipitate is mainly TiN with sizes of 50~100 nm,and the precipitation begins at 1 343℃ which is below the solidus temperature(TS).Calculations show that TiC can not be formed due to low titanium content.Refined crystalline strengthening and solid solution strengthening contribute most to the strength properties.