Development of High Strength Construction Rebars
Abstract:
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.
Keywords:
high strength rebar, V-N microalloying, precipitation strengthing, afterheat treatment, ultra-fine grain steel, seismic resistant rebar
Author:
Yang Caifu
Affiiation
Central Iron & Steel Research Institute, Beijing 100081
PDF:
Source:
Proceedings of International Seminar on Production and Application of High Strength Seismic Grade Rebar Containing Vanadium, Beijing, China, June 2010
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