Abstract:
C 0.23~0.33wt%, Si 0.15~0.35wt%, Mn 0.9~1.3wt%, P 0.03wt%이하, S 0.02wt%이하, Cr 0.5~0.7wt%, Ti 0.005~0.02wt%, V 0.05~0.1wt%, B 0.001~0.004wt% 및잔부 Fe로구성된도어힌지브라켓제조방법이소개된다.
Abstract:
PURPOSE: High-strength spheroidal graphite cast iron and a manufacturing method thereof are provided to prevent an increase in the weight of parts and to secure a suitable elongation ratio as well as increased strength. CONSTITUTION: A method for manufacturing high-strength spheroidal graphite cast iron comprises the steps of: melting a material to obtain a melt(S100), injecting the melt into a mold at 1300-1500°C(S200), solidifying the casting and regulating cooling speed to maintain 70-90% of pearlite(S300), and separating the casting from the mold and air-cooling the casting(S400). [Reference numerals] (S100) Melting; (S200) Injecting; (S300) Solidifying; (S400) Air-cooling