Cgi cast iron and production method for the same

Abstract

The present invention relates to cast iron, and more particularly, to a compacted graphite iron (CGI) cast iron having an improved casting property, stable tensile strength and yield strength, and hardness in an appropriate range, by being produced with the amounts of carbon (C), silicon (Si), manganese (Mn), copper (Cu), tin (Sn), and magnesium (Mg) controlled, and a production method thereof.

Description

TECHNICAL FIELD[0001]The present invention relates to cast iron and a method of producing the same, and more particularly, to cast iron having an improved casting property and stable tensile strength and yield strength by controlling the contents of components added to iron, and a method of producing the cast iron. Cast iron according to the present invention corresponds to hypereutectic compacted graphite iron (CGI) cast iron that can be applied to the cylinder block of diesel engines with high output.TECHNICAL FIELD[0002]Recently, it is required to reduce the contents of environmental pollutants such as Cox or NOx discharged from engines due to strictly enforced environmental regulation.[0003]For diesel engines, it is necessary to increase the explosive pressure of the engines in order to reduce the exhaust amount of environmental pollutants such as Cox or NOx. It needs to increase the strength of the cylinder block of the engines in order to increase the explosive pressure of the...

AI Technical Summary

Benefits of technology

[0025]According to the present invention, it is possible to provide cast iron with tensile strength in the range of 500 to 600 MPa, yield strength in the range of 350 to 450 Mpa, and Brinell Hardness in the range of 255 to 280, by precisely controlling the amount of magnesium (Mg) and controlling the amounts of copper (Cu) and tin (Sn).

[0026]Since the cast iron according to the present invention has stable tensile strength and yield strength and appropriate hardness, the cast iron can be used to manufacture

Problems solved by technology

However, the spherical graphite cast iron has high strength required for cylinder blocks, but has an insufficient casting property and low thermal conductivity to be produced in a complicate shape, such that it has a limit in use for cylinder bocks having complicated shap

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