金属新材料板块12月25日涨2.23%，有研粉材领涨，主力资金净流入3.23亿元

Group 1 - The metal new materials sector increased by 2.23% on December 25, with Youyan Powder Materials leading the gains [1] - The Shanghai Composite Index closed at 3959.62, up 0.47%, while the Shenzhen Component Index closed at 13531.41, up 0.33% [1] - Key stocks in the metal new materials sector showed significant price increases, with Youyan Powder Materials rising by 11.71% to a closing price of 71.65 [1] Group 2 - The sector saw a net inflow of 3.23 billion yuan from institutional investors, while retail investors experienced a net outflow of 3.43 billion yuan [2] - Major stocks like Zhongke Sanhuan and Sry New Materials had varying levels of net inflow and outflow, indicating mixed investor sentiment [3] - The trading volume for Youyan Powder Materials reached 174,800 hands, with a transaction value of 1.196 billion yuan [1]