Ferrite nodular cast iron and production method thereof
A technology of ductile cast iron and its production method, which is applied in ferritic nodular cast iron and its production, ductile cast iron and its production field, can solve the problems of decreased elongation, high elongation, low strength, etc., and improve the stability of machining accuracy , high elongation and low surface hardness, the effect of improving mechanical properties
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Embodiment 1
[0025] (a) Furnace charge selection: use high-purity pig iron, low-Mn, low-P, low-S steel scrap, and recarburizer as charge, 70% of high-purity pig iron, 15% of scrap steel, 15% of furnace charge, and a small amount of recarburizer. Guarantee that Mn≤0.2%; P≤0.03%; S≤0.015%, Ti≤0.015% in the furnace charge, the total content of trace impurities ≤0.1%, and the Si content in the ingredients is 1%,
[0026] (b) Smelting: The raw molten iron is smelted in an intermediate frequency induction furnace, and the furnace temperature is 1500°C;
[0027] (c) Select QRMg8RE3 as the nodulizer, the addition amount is 1.4%, select 75Si-Fe as the bottom silicon inoculant, the addition amount is 1.6%, spheroidize and inoculate at the furnace temperature to obtain nodularized molten iron;
[0028] (d) Upside-down inoculation: 75Si-Fe is used as upside-down inoculant, and the addition amount is 1.0%;
[0029] (e) Floating silicon inoculation: use 75Si-Fe as floating silicon inoculation, the addi...
Embodiment 2
[0034] (a) Furnace charge selection: use high-purity pig iron, low-Mn, low-P, low-S steel scrap, and recarburizer as charge, 70% of high-purity pig iron, 15% of scrap steel, 15% of furnace charge, and a small amount of recarburizer. Guarantee that Mn≤0.2%; P≤0.03%; S≤0.015%, Ti≤0.015% in the furnace charge, the total content of trace impurities ≤0.1%, and the Si content in the ingredients is 1%,
[0035] (b) Smelting: The raw molten iron is smelted in an intermediate frequency induction furnace, and the furnace temperature is 1500°C;
[0036] (c) Use QRMg8RE3 as the nodulizer, the addition amount is 1.4%, choose 75Si-Fe as the bottom silicon inoculant, the addition amount is 1.3%, add 0.03% molybdenum iron powder, and the molybdenum content in the molybdenum iron is 60%. Spheroidizing and inoculating at the temperature of the furnace to obtain spheroidized molten iron;
[0037] (d) Upside-down inoculation: 75Si-Fe is used as upside-down inoculant, and the addition amount is 1...
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