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Research on Microstructure and Properties of Q345R Nb Microalloyed Steel
Author(s): 
Pages: 110-112+116
Year: Issue:  4
Journal: Hot Working Technology

Keyword:  Q345RNb-microalloyed steelmicrostructurefine grain strengtheningmechanical property;
Abstract: The tensile test, impact test, metallographic test and electron microscope test were conducted on Q345R Nb containing steel hot rolling plate to analyze the mechanical properties, microstructure and strengthening mechanism. The results show that the experimental material has high strength, good extensibility and good low temperature impact performance. The microstructure was made up by pearlite, ferrite and tempered sorbite. The grain size is grade 12-13. The MnS inclusion has small amounts. The main precipitation is dispersed Nb(C, N) with a tiny size between 10 nm-50 nm, which can improve the properties of the steel mainly by fine grain strengthening and precipitation strengthening.
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