| 摘要 |
The invention provides a fluoride-free continuous casting mold flux for low-carbon steel, comprising, based on weight, Na 2 O 5-10%, MgO 3-10%, MnO 3-10%, B 2 O 3 3-10%, Al 2 O 3 ‰¤6%, Li 2 O<3%, C 1-3%, and the balance of CaO and SiO 2 as well as inevitable impurities, wherein the ratio of CaO/SiO 2 is 0.8ˆ¼1.3. The mold flux has a melting point of 950ˆ¼1150°C, a viscosity at 1300°C of 0.1-0.3Pa.s, and a crystallization rate of 10-50% as determined according to the method described in the specification for examining crystallization property. The boron-containing, fluoride-free flux developed according to the invention has a moderate crystallization rate, can be used in a crystallizer to control transfer of heat from molten steel effectively, and has been applied successfully in a low-carbon steel slab conticaster with a metallurgical effect that arrives at the level of a traditional fluoride-containing flux to full extent. |
