Improvement of Nb Element on Reinforcement Properties

Abstract

Reinforcement bar is the main skeleton of building materials. In order to increase the strength and plasticity of reinforcing bar, Nb and V elements are added to reinforcing bar to refine grain size. Fine grain strengthening can improve the strength of reinforcing bar and also improve the plasticity and toughness of reinforcing bar. The strain produced by the external force is very small in the grain interior and grain boundary of fine grains, and the difference of phase transformation is very small, the deformation is relatively uniform, and the chance of cracking caused by stress concentration is small. Tensile test and metallographic, scanning and energy spectrum analysis are carried out on the seismic steel bar. It is concluded that adding Nb and V elements will make the strength of the steel bar. And the plasticity is improved.