| 摘要 |
PURPOSE:To improve the effect of removing impurities from a casting and the effect of preventing the defect thereof by incorporating a specific ratio of Na2O, B2O3, F and SiO2 therein. CONSTITUTION:A flux for pouring consists, by weight, of 6-20% Na2O, 4-19% B2O3 or, in addition thereto, <=15% F and the balance SiO2. The flux is used in the stage of pouring a molten spheroidal graphite cast iron and is highly effective in removing impurities from the casting and preventing the defect thereof.
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