Rolling Of SD Grade Rebar Using Leaner Chemistry Steel  

Oleh:

Rajamani A., S. ; Biswas B., Suman ; Mukundan C., Vinod ; D, Anurag Raturi ; E, Jijith NJ

Jenis: Article from Proceeding
Dalam koleksi: 12th ANQ Congress in Singapore, 5-8 Agustus 2014, page 1-11.
Topik: Rebar rolling; SD grade; Leaner chemistry; Design Of Experiment; Cost saving
Fulltext: BP1-1.5-P0357.pdf (1.64MB)

Isi artikel

Tata Steel Limited (formerly Tata Iron and Steel Company Limited (TISCO) is a subsidiary of the Tata Group. It is the second largest private-sector steel company in India with an annual capacity of 9.7million tons. Tata Steel business is majorly branched to two segments namely Flat products and Long products. Long products business is further divided into two market segments namely Wirerods and Reinforcement bars. Tata Tiscon – the Thermo Mechanically Treated (TMT) Reinforcement bar brand of Tata Steel is India’s best known rebar brand. Tata Tiscon is produced in 3 variants, namely 500D, CRSD and SD, catering to specific customer needs. 500 D is for normal applications, CRSD is for regions where there is a corrosive atmosphere and SD (Super Ductile) grade is for regions susceptible to seismic attack. Tata Steel tried to produce SD grade at our own mills, which calls for higher UTS/YS ratio (>1.15) with the chemistry of billet used for 500D. Since this chemistry could not give the ratio that is required for SD grade, Ferro alloying elements were added to achieve this superior property. Even with this enriched chemistry, the strike rate at our mills is poor. Cost of production of SD grade was higher than normal 500D grade by INR 1000/ton. Ferro alloy addition was contributing to the major share of the additional cost involved. With the price of SD grade positioned at a premium of INR 1000/ton, there was no additional margin of SD grade in comparison to Fe 500 D grade (normal rebar). The poor strike rate with the additional cost of production, which made SD grade commercially less profitable in comparison to normal 500 D grade. With the continuous increase in the cost of Ferro-alloys and with the advent of emerging competition, this product was becoming economically unviable in the market place. Hence, there was a need for achieving the required properties with lower cost. The objective of the project was to reduce the cost of production of SD grade by reducing Ferro-Alloy consumption by 50% of current level thereby increasing profitability. Through the systematic DOE (Design of Experiments), the trials were conducted successfully. By changing process parameters, the team could produce this special grade (SD) with the same quality of billets that was used for Fe 500D and commercially roll the same, there by bringing an Annualized Savings: INR 80 Million

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