特钢板块7月31日跌2.59%，盛德鑫泰领跌，主力资金净流出4.82亿元

Group 1 - The special steel sector experienced a decline of 2.59% on July 31, with Shengde Xintai leading the drop [1] - The Shanghai Composite Index closed at 3573.21, down 1.18%, while the Shenzhen Component Index closed at 11009.77, down 1.73% [1] - A table detailing the individual stock performance within the special steel sector was provided [1] Group 2 - On the same day, the special steel sector saw a net outflow of 482 million yuan from main funds, while retail funds had a net inflow of 356 million yuan [2] - The net inflow from speculative funds was 125 million yuan [2] - A table showing the fund flow for individual stocks in the special steel sector was also included [2]