Method for producing die-cast product of spherical graphitic cast iron including ultrafine spherical graphite, and spheroidizing treatment agent
a technology of spherical graphite and die-cast product, which is applied in the field of die-cast product production of spherical graphite cast iron including ultrafine spherical graphite, and a spheroidizing treatment agent, to achieve the effects of preventing the generation of chill, simple method, and good reproducibility
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example 1
[0078]Raw materials such as pig iron, steel scrap, and Fe—Si were blended so as to achieve the following target chemical composition.
[0079](by mass %)
[0080]C: 3.60, Si: 2.60, Mn: 0.10, P: 0.025, the rest is Fe
[0081]These raw materials were heated and melted in a high frequency induction furnace.
[0082]Heating was continued after melting down, 1,425° C. was passed, and heating was also continued. At temperature above 1,425° C., oxygen was removed by CO generation.
[0083]When the temperature was further increased, CO generation from the heat-resistant material in the furnace was observed at temperature exceeding 1,510° C. Therefore, the temperature increase was stopped at 1,510° C., and the temperature was kept at 1,510° C. for 5 minutes. During this period, oxygen is efficiently removed from the original molten metal.
[0084]After keeping the temperature at 1,510° C. for 5 minutes, it was gradually cooled to 1,425° C.(=T° C.) at a rate of about 10° C. / min. On the way, the temperature was...
example 2
[0102]In the present example, the temperature was kept at 1,510° C. for 5 minutes and then gradually cooled to 1,425° C.(=T° C.) at a rate of about 5° C. / min. On the way, the temperature was once lowered to 1,440° C., then raised to 1,460° C., and then cooled at the rate of 5° C. / min. The spheroidizing treatment was carried out at 1,425° C.
[0103]The nitrogen amount generated during melting of a sand mold casting was 0.7 ppm (by mass).
[0104]Result is shown in FIG. 2. In the present example, 2,605 pieces / mm2 of spherical graphites, which is a larger number of graphite particles than in the Example 1, was observed.
example 3
[0105]An example of sand mold thin walled spherical graphite cast iron is shown. The product was a box casting with an average wall thickness of 6.5 mm and a weight of 125 kg.
[0106]Raw materials such as pig iron, steel scrap, and Fe—Si were blended so as to achieve the following target chemical composition.
[0107](by mass %)
[0108]C: 3.70, Si: 2.60, Mn: 0.50, P: 0.025. S: 0.035, the rest is Fe
[0109]These raw materials were heated and melted in a high frequency induction furnace. After melting down, these were heated to exceed the temperature of 1,425° C., at which the oxygen reduction reaction started by reduction, and also heated to about 1,500° C. and held for 5 minutes.
[0110]An Mg treatment was carried out at about 1,500° C. The Mg treatment was carried out based on Fe-50% Si-3% Mg (by mass), by adding the spheroidizing agent containing N: 87 ppm, and C: 1.5% (by mass).
[0111]As a cover material for controlling the reaction of the spheroidizing agent, 1% by weight of Fe-75mass % Si ...
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Abstract
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