普钢板块9月18日跌1.5%，三钢闽光领跌，主力资金净流出4.27亿元

Market Overview - On September 18, the general steel sector declined by 1.5%, with Sansteel Mingguang leading the drop [1] - The Shanghai Composite Index closed at 3831.66, down 1.15%, while the Shenzhen Component Index closed at 13075.66, down 1.06% [1] Individual Stock Performance - Notable gainers included Wujin Stainless Steel, which rose by 1.54% to a closing price of 7.23, and Chongqing Steel, which increased by 0.64% to 1.58 [1] - Major decliners included Sansteel Mingguang, which fell by 3.85% to 4.24, and Baotou Steel, which decreased by 2.82% to 2.41 [2] Trading Volume and Value - The trading volume and value for key stocks in the steel sector were significant, with Chongqing Steel recording a volume of 3.96 million hands and a transaction value of 636 million yuan [1] - Sansteel Mingguang had a trading volume of 466,700 hands and a transaction value of 201 million yuan [2] Capital Flow Analysis - The steel sector experienced a net outflow of 427 million yuan from main funds, while retail investors contributed a net inflow of 372 million yuan [2] - Notable capital inflows were observed in stocks like Shougang Corporation, which saw a net inflow of 30.4 million yuan from main funds [3] Summary of Capital Flows by Stock - Hualing Steel had a main fund net inflow of 64.74 million yuan, while Sansteel Mingguang had a net inflow of 4.46 million yuan from retail investors [3] - Conversely, stocks like Shandong Steel and Ling Steel experienced net outflows from main funds, indicating a shift in investor sentiment [3]