Srimanta Sam

Working as a senior manager, Research & Development. Primarily responsible for new product development activities at JSW Steel Mumbai. Significant contribution towards the development of various value added grade of steel which includes Dual Phase 590, S650MC, APIX70 etc. through CSP route and Fe500S, Fe600 TMT rebar.

Topic: Seismic resistant TMT Re-bar through QST process

Abstract: Reinforcement steel rebar is a vital material for RCC structure. Thermo mechanically treated (TMT) rebar using QST process is very much popular because high strength along with moderate elongation is achieved through normal C-Mn only without any micro alloy addition. During earthquake, rebars are expected to undergo large inelastic/ plastic deformations before failure for adequate seismic energy dissipation and thus it places certain special requirements on their properties, such as high yield strength(YS) high ultimate tensile strength to yield strength ratio (UTS/YS ratio). In India, seismic resistant grade IS1786: 2008 Fe500S has been incorporated in the amendment done in 2012. Since then various steel manufacturers have tried and successfully developed Fe500S grade through micro alloy addition and without quenching and self-tempering process, which increases the cost of production. This work describes the success story of development of cost effective Fe500S grade steel through C-Mn route using QST process. Mechanical properties achieved are YS>500MPA, UTS/YS ratio > 1.25 and uniform elongation > 8%.