A small-diameter ductile iron profile with a diameter of less than 25mm and its preparation method
A small-diameter, nodular iron technology, applied in the field of cast iron material casting, can solve the problems of low strength and shrinkage defects, etc., and achieve the effects of good cutting performance, compact structure and small cutting resistance
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Embodiment 1
[0043] Φ22mm ductile iron profile material and its preparation.
[0044] Its composition by weight percentage is: C: 3.6%, Si: 2.4%, Mn: 0.1%, P: 0.04%, S: 0.02%, and the rest is Fe.
[0045] The preparation method of the above-mentioned Φ22mm small-diameter nodular cast iron profile comprises the following steps:
[0046] (1) Hot metal smelting and composition adjustment
[0047] Use a 1.5-ton medium-frequency induction furnace to melt molten iron. The furnace materials are low-manganese cast ductile iron pig iron, scrap steel, recycled materials, 75% ferrosilicon and SiC, etc., and wait until all the materials in the furnace are completely melted; use the rapid analysis of the composition before the furnace to adjust the original molten iron. C: 3.6%, Si: 1.8%, Mn: 0.1%, P: 0.04%, S: 0.02%, the melting temperature is 1550°C, and the tapping temperature is 1520°C.
[0048] (2) Spheroidization
[0049] The spheroidization adopts a dam-type ladle, and the ratio of the height...
Embodiment 2
[0061] Φ20mm ductile iron profile material and its preparation.
[0062] Its composition by weight percentage is: C: 3.4%, Si: 2.8%, Mn: 0.2%, P: 0.06%, S: 0.04%, and the rest is Fe.
[0063] The preparation method of the above-mentioned Φ20mm small-diameter nodular cast iron profile comprises the following steps:
[0064] (1) Hot metal smelting and composition adjustment
[0065] Use a 1.5-ton medium-frequency induction furnace to melt molten iron. The furnace materials are low-manganese cast ductile iron pig iron, scrap steel, recycled materials, 75% ferrosilicon and SiC, etc., and wait until all the materials in the furnace are completely melted; use the rapid analysis of the composition before the furnace to adjust the original molten iron. C: 3.4%, Si: 2.0%, Mn: 0.2%, P: 0.06%, S: 0.04%, the melting temperature is 1565°C, and the tapping temperature is 1535°C.
[0066] (2) Spheroidization
[0067] The spheroidization adopts a dam-type ladle, and the ratio of the height...
Embodiment 3
[0079] Φ18mm ductile iron profile material and its preparation.
[0080] Its composition by weight percentage is: C: 3.8%, Si: 3.3%, Mn: 0.3%, P: 0.08%, S: 0.04%, and the rest is Fe.
[0081] The preparation method of the above-mentioned Φ18mm small-diameter nodular cast iron profile comprises the following steps:
[0082] (1) Hot metal smelting and composition adjustment
[0083] Use a 1.5-ton medium-frequency induction furnace to melt molten iron. The furnace materials are low-manganese cast ductile iron pig iron, scrap steel, recycled materials, 75% ferrosilicon and SiC, etc., and wait until all the materials in the furnace are completely melted; use the rapid analysis of the composition before the furnace to adjust the original molten iron. C: 3.8%, Si: 2.4%, Mn: 0.3%, P: 0.08%, S: 0.04%, the melting temperature is 1580°C, and the tapping temperature is 1550°C.
[0084] (2) Spheroidization
[0085] The spheroidization adopts a dam-type ladle, and the ratio of the height...
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