Metal type rare earth microalloyed D-type graphite cast iron glass mould and preparation method thereof
A technology of micro-alloying and graphite cast iron, which is applied in the field of glass molds, can solve the problems of poor thermal conductivity, glass products cannot be cooled quickly, and limit the molding speed, etc., to improve the comprehensive performance index, solve the whitening tendency, and increase the service life. Effect
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[0024] Example one:
[0025] (1) Proportion of its chemical composition according to mass percentage, C 3.35%, Si 2%, Mn 0.4%, Cr 0.3%, Mo 0.4%, Ni0.9%, V <0.02%, Al<0.02%, Cu< 0.02%, Ti0.05%, RE0.02%, the rest are Fe and unavoidable impurities, unavoidable impurities include P<0.05%, S<0.01%.
[0026] (2) Melting: first put the calculated scrap steel and cast iron into an intermediate frequency electric furnace and heat it to melt completely, and then put the proportionally weighed ferrosilicon, ferromanganese, ferrochromium, molybdenum After iron, vanadium iron, titanium iron, electrolytic nickel, electrolytic copper, and pure aluminum are added and heated to completely melt, adjust the temperature of the molten iron to 1480℃~1500℃.
[0027] (3) Purification and inoculation: The rare earth alloy ReSiFe, which accounts for 0.3% to 0.5% of the total weight of molten iron, is used as a purifier of molten iron and 0.3% to 0.5% of the total weight of molten iron is a Si-Fe inoculant co...
Example Embodiment
[0031] Example two
[0032] According to the following mass percentage ratio: C 3.55%, Si 2.1%, Mn0.5%, Cr 0.35%, Mo 0.5%, Ni 1.0%, V <0.02%, Al<0.02%, Cu<0.02%, Ti 0.08% , RE 0.04%, the rest is Cu and unavoidable impurities. The preparation method is the same as in Example 1. The finished product needs to control impurities: P<0.01%, S<0.01%.
Example Embodiment
[0033] Example three
[0034] According to the following mass percentage ratio: C 3.7%, Si 2.2%, Mn0.6%, Cr 0.4%, Mo 0.5%, Ni1.1%, V <0.02%, Al<0.02%, Cu<0.02%, Ti0. 1%, RE0.05%, the rest is Cu and unavoidable impurities. The preparation method is the same as in Example 1. The finished product needs to control impurities: P<0.01%, S<0.01%.
[0035] D-type graphite is a kind of flake graphite. It grows between austenite dendrites. The continuity of austenite splits the continuity of graphite flakes. The gap between D-type graphite and the matrix is greater than that of other flake graphites. The gap is small. The primary austenite in the D-type graphite structure has a skeleton structure, and the eutectic austenite connects the branches of the primary austenite together like a network, which improves the ability of the skeleton to resist external forces. In addition, the shape of D-type graphite is small, crimped, and blunt at the end, which determines that it has a small cutt...
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