Shares of Steel Authority of India (SAIL) surged 13 per cent to Rs 130.35 on the BSE in Monday's intra-day trade after the company reported best-ever quarterly standalone profit after tax (PAT) of Rs 4,304 crore for the second quarter ended September 2021 (Q2FY22). It had posted Rs 393 crore net profit in the year-ago quarter. On a sequential basis, PAT up 12 per cent from Rs 3,850 crore in June 2021 quarter.