Abstract
High strength vanadium micro-alloyed steel with yield strength of 600MPa has been developed based on commercial HRB400 steel bar. Experimental methods, such as OM, SEM and TEM, were used to study the experimental steels. Compared with HRB400, HRB400 steel with vanadium addition boasts much finer microstructure, and large numbers of nanometer precipitates exist in the specimens of HRB400 steel with vanadium addition. Analysis shows that strength of HRB400 steel with vanadium addition dramatically increases through grain refinement strengthening and precipitation hardening of nanometer VCN particles.
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