Mumbai, Sept. 16 -- Tube Investments of India Ltd gained for a third straight session today. The stock is quoting at Rs 3391.5, up 1.12% on the day as on 12:49 IST on the NSE. The benchmark NIFTY is up around 0.51% on the day, quoting at 25197.3. The Sensex is at 82226.93, up 0.54%. Tube Investments of India Ltd has gained around 11.15% in last one month. Meanwhile, Nifty Auto index of which Tube Investments of India Ltd is a constituent, has gained around 7.43% in last one month and is currently quoting at 26760.65, up 0.88% on the day. The volume in the stock stood at 3.63 lakh shares today, compared to the daily average of 4.43 lakh shares in last one month. The benchmark September futures contract for the stock is quoting at Rs 3392.1...