Development of High Strength Construction Rebars
The research, production and application of high strength rebars in China are reviewed. Microalloying, afterheat treatment and fine-grain strengthening are the most effective methods in developing high strength rebars. V-N microalloyed rebars have noticeable advantages over those microalloyed with other elements. Enhanced nitrogen in vanadium-containing rebars promotes the precipitation of V(C,N) particles which markedly improves the precipitation strengthening effects of vanadium, 50% of which can be saved. The goal of saving costly FeV and reducing costs are realized. Based on carbon steel and 20MnSi steel, grade 3 and grade 4 rebars with yield strength of 400MPa and 500MPa respectively can be produced by afterheat treating, or ultra-fine grain technologies; the alloy consumption is reduced and resources are saved at the same time. In recent years, remarkable progress has been achieved in production and application of high strength rebars.
high strength rebar, V-N microalloying, precipitation strengthing, afterheat treatment, ultra-fine grain steel, seismic resistant rebar
Central Iron & Steel Research Institute, Beijing 100081
Proceedings of International Seminar on Production and Application of High Strength Seismic Grade Rebar Containing Vanadium, Beijing, China, June 2010