| 摘要 |
PROBLEM TO BE SOLVED: To provide a high silicon cast iron superior in acid resistance, which not only possesses improved tensile strength compared to conventional high silicon cast iron, but also is inexpensive and mass producible, by improving the manufacturing process without adding any apparatus, and a manufacturing method therefor. SOLUTION: This high silicon cast iron includes silicon(Si) 13.5-15.5 wt.%, carbon(C) 0.7-1.1 wt.%, manganese(Mn) 2.2 wt.% or less, at least one element between chromium(Cr) 1-5 wt.% and molybdenum(Mo) of 1-5 wt.%, and the balance iron(Fe) with unavoidable impurities. The manufacturing method comprises heating a molten metal of the above composition at a temperature of 1,650 deg.C or higher to remove impurities, tapping it into a ladle in which a misch metal 0.1-0.4% against the weight of the molten metal is added, and casting the molten metal while controlling it to the lowest castable temperature, namely 1,270-1,350 deg.C.
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