| 摘要 |
<p>A casting powder for the continuous casting of steel on the basis of silicate slags having the following chemical analysis: 25 - 45% by wt. of SiO2 20 - 45% by wt. of CaO 1 - 16% by wt. of Al2O3 0.1 - 15% by wt. of MgO 0.1 - 1.5% by wt. of FeO (20 - 45.1% by wt. of CaO+MgO) 0.05 - 10% by wt. of TiO2 3 - 15% by wt. of Na2O+K2O 0.05 - 10% by wt. of MnO 0 - 7% by wt. of B2O3 3 - 10% by wt. of bound F which may as well include impurities from the raw materials. The slag is premelted, foamed to a bulk weight of 0.5 to 1.4 kg/l, prcferably 0.8-1.2 kg/l,and coated superficially with a layer of 1.5 to 15% by weight, preferably 2 to 6%, of carbon black and/or graphite with the aid of an appropriate adhesive.</p> |
