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Title: Development of micro alloyed structural steels in secondary steel sector using induction melting furnace and controlled rolling route
Authors: Bagchi, Robin K
Sehgal, Rakesh
Dhiman, Suresh
Issue Date: Jun-2007
Publisher: CSIR
IPC CodeC22C38/00
Abstract: Micro alloyed steels with mild steel base were produced through induction furnace and controlled rolling route to produce ribbed bars used in constructions. The aim was to introduce micro alloyed steels in the secondary steel sector to produce all sections of structural steels, thus countering the limitation of TMT process which is considered to be suitable only for round sections. Mainly, % vanadium and % niobium were varied in trial heats. Combinations of vanadium-nitrogen were also tried. Total 12 heats were made using induction melting furnace. Castings in the form of ingots of 88×112×1400 mm were made which were further rolled to 12 mm bars with different cooling parameters. Commonly, 12 mm CTD bars result on 450 N-mm⁻² UTS and 15% EL, while standard 12 mm TMT bar produces 650 N-mm⁻² UTS and 25%EL. Micro alloyed steels with vanadium and niobium employing conventional air cooling on bed produced better results for strength and ductility values as compared to TMT bars. Neither twisting nor water cooling/quenching was required. The best cost effective combination of 790 N-mm⁻² UTS, 590 N-mm⁻² YS, 23% EL and 59% RA was obtained with low % vanadium.
Page(s): 193-201
ISSN: 0971-4588
Source:IJEMS Vol.14(3) [June 2007]

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