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Acid-proof high silicon cast iron and its manufacture process

A manufacturing method and a technology for high-silicon cast iron, which are applied in the field of high-silicon cast iron, can solve the problems of difficulty in applying production processes and increase production costs, and achieve the effects of cheap mass production and high tensile strength

Inactive Publication Date: 2005-01-12
WOOJIN
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  • Abstract
  • Description
  • Claims
  • Application Information

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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.

Method used

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  • Acid-proof high silicon cast iron and its manufacture process
  • Acid-proof high silicon cast iron and its manufacture process
  • Acid-proof high silicon cast iron and its manufacture process

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Embodiment

[0031] Generally, high-silicon cast iron has the disadvantage of being mixed with hydrogen to produce gas defects when it solidifies after pouring, resulting in very low tensile strength. In order to improve this point, a method of melting and pouring at a temperature of about 1400 ° C is now adopted after the master alloy is made by melting once, and then melted twice. However, in the case of using this method, 10kgf / mm cannot be obtained 2 above tensile strength. This is because the impurities contained in the silicon raw material cannot be completely removed, and inclusions are formed after casting.

[0032] Therefore, in the present invention, in order to remove impurities contained in the silicon raw material, a method of sufficiently removing impurities at 1650° C. or higher is employed. In the case of melting temperature below 1650°C in Table 1, that is, in comparative materials 1 to 9, such as Figure 3a As shown, it can be observed that there are inclusions on the ...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D1/00B22D27/20C22C33/08C22C37/10
CPCC22C33/08C22C37/10
Inventor 白承翰孙龙哲金正哲韩东运白镇铉
Owner WOOJIN
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