金属新材料板块9月12日涨0.81%，银河磁体领涨，主力资金净流入3.19亿元

Group 1 - The metal new materials sector increased by 0.81% compared to the previous trading day, with Galaxy Magnet leading the gains [1] - The Shanghai Composite Index closed at 3883.69, up 0.22%, while the Shenzhen Component Index closed at 12996.38, up 0.13% [1] - A detailed table of individual stock performance in the metal new materials sector is provided [1] Group 2 - The net inflow of main funds into the metal new materials sector was 319 million yuan, while retail investors saw a net outflow of 459 million yuan [2] - The net inflow from speculative funds was 139 million yuan [2] - A detailed table of fund flow for individual stocks in the metal new materials sector is provided [2]