Indian Journal of Engineering & Materials Sciences

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Development and Characterization of Fe500S TMT Rebars


Affiliations
1 Department of Metallurgical Engineering, IIT (BHU), Varanasi 221 005, India
2 Steel Authority of India Ltd (SAIL)(RDCIS), Ranchi 834 003, India
3 Department of Materials and Metallurgical Engineering, NIFFT, Ranchi 834 003, India

New varieties of high-strength rebar Fe500S with superior seismic resistance properties have been developed to meet future needs of construction in seismic prone areas. Billets have been produced by standard steel making process route (BOF-LF-CC) with the exception of chemical designing, which has been uniquely improvised so as to reduce the alloying cost. Reheated billets have been rolled into final TMT rebars by varying the operation parameters such as velocity and quenching rate. Chemical properties, surface morphology, and mechanical properties of the thus-produced TMT rebars have been studied by OES (spark analysis), optical microscopy, tensile, and hardness tests. Cost analysis has shown attenuation in the alloying cost by a margin of Rs. 855 per ton. Mechanical properties as evaluated from tensile tests have also yielded a positive outcome in the form of better tensile strength (UTS/YS ratio) and hardness. All the results have been compared with the Indian Standard IS 1786:2008.

Keywords

Fe500S, TMT rebars, Cost optimization, OES, Tensile, Hardness
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  • Development and Characterization of Fe500S TMT Rebars

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Authors

Ishwari Narain Choudhary
Department of Metallurgical Engineering, IIT (BHU), Varanasi 221 005, India
Vikash Kumar
Steel Authority of India Ltd (SAIL)(RDCIS), Ranchi 834 003, India
Ratnesh Kumar Gupta
Department of Materials and Metallurgical Engineering, NIFFT, Ranchi 834 003, India
Nitesh Kumar Sinha
Department of Metallurgical Engineering, IIT (BHU), Varanasi 221 005, India
Jayant Kumar Singh
Department of Metallurgical Engineering, IIT (BHU), Varanasi 221 005, India

Abstract


New varieties of high-strength rebar Fe500S with superior seismic resistance properties have been developed to meet future needs of construction in seismic prone areas. Billets have been produced by standard steel making process route (BOF-LF-CC) with the exception of chemical designing, which has been uniquely improvised so as to reduce the alloying cost. Reheated billets have been rolled into final TMT rebars by varying the operation parameters such as velocity and quenching rate. Chemical properties, surface morphology, and mechanical properties of the thus-produced TMT rebars have been studied by OES (spark analysis), optical microscopy, tensile, and hardness tests. Cost analysis has shown attenuation in the alloying cost by a margin of Rs. 855 per ton. Mechanical properties as evaluated from tensile tests have also yielded a positive outcome in the form of better tensile strength (UTS/YS ratio) and hardness. All the results have been compared with the Indian Standard IS 1786:2008.

Keywords


Fe500S, TMT rebars, Cost optimization, OES, Tensile, Hardness