普钢板块9月12日涨1.87%，首钢股份领涨，主力资金净流入854.71万元

Core Viewpoint - On September 12, the steel sector saw an increase of 1.87% compared to the previous trading day, with Shougang Corporation leading the gains [1] Group 1: Market Performance - The Shanghai Composite Index closed at 3883.69, up by 0.22% [1] - The Shenzhen Component Index closed at 12996.38, up by 0.13% [1] Group 2: Capital Flow - The steel sector experienced a net inflow of main funds amounting to 8.5471 million yuan, while speculative funds saw a net outflow of 41.5043 million yuan [2] - Retail investors contributed a net inflow of 32.9572 million yuan to the steel sector [2]