Acid-proof high silicon cast iron and its manufacturing process

Abstract

The present invention provides 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 thereof. 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 wt.% 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..

Description

technical field [0001] The present invention relates to high-silicon cast iron with excellent acid resistance, especially the high-silicon cast iron with improved strength and brittleness by simplifying the manufacturing process and stabilizing the chemical composition. Background technique [0002] With the development of the chemical industry, there is an increasing demand for materials that can be used on equipment exposed to strong corrosive environments. High-silicon cast iron is one of the materials developed according to this demand. Since this high-silicon cast iron has excellent resistance to almost all kinds of acids, it is mainly used for piping and connecting devices in corrosive fluid environments, and can be used in the discharge or discharge of acids, bleaches, detergents or corrosive fluids. All parts extracted. [0003] Although high-silicon cast iron has such excellent properties, its industrial use is very limited due to the fact that its manufacturing m...

AI Technical Summary

Problems solved by technology

Since these methods require secondary melting and additional equipment, there is a problem that the production cost increases and it is not easy to apply to the existing production process.

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