Microalloying high-strength gray pig iron piece and smelting method thereof
A micro-alloying and high-strength technology, applied in the field of metal casting, can solve the problems of backward casting technology, high section sensitivity, low casting strength, etc., and achieve the effect of refining pearlite, avoiding coarse graphite and improving strength.
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Embodiment 1
[0029] A micro-alloyed high-strength gray iron casting, containing the following components in weight percentage: C 3.15%, Si 1.82%, Mn 0.5%, Cr 0.36%, Cu 0.74%, Nb 0.035%, V 0.08%, Ti 0.017%, the rest is iron and other unavoidable impurities.
[0030] The method for smelting the above-mentioned micro-alloyed high-strength gray iron castings comprises the following steps:
[0031] (1) Add charge and recarburizing agent into the hearth of the smelting furnace, heat up and melt;
[0032] (2) After the charge is completely melted, transfer it to the holding furnace, raise the temperature to 1450-1480°C and add ferromanganese alloy, ferrochrome alloy, niobium vanadium alloy, ferrosilicon alloy and metallic copper;
[0033] (3) After the alloy and metal copper are completely melted, continue to heat up to 1500-1520°C, and perform chemical composition analysis with a spectrometer. After the chemical composition analysis is qualified, heat up to 1550-1580°C, and keep at this tempera...
Embodiment 2
[0039] A micro-alloyed high-strength gray iron casting, containing the following components in weight percentage: C 2.92%, Si 2.15%, Mn 0.3%, Cr 0.5%, Cu 0.3%, Nb 0.011%, V 0.05%, Ti 0.025%, the rest is iron and other unavoidable impurities.
[0040] The method for smelting the above-mentioned micro-alloyed high-strength gray iron castings comprises the following steps:
[0041] (1) Add charge and recarburizing agent into the hearth of the smelting furnace, heat up and melt;
[0042] (2) After the charge is completely melted, transfer it to the holding furnace, raise the temperature to 1450-1480°C and add ferromanganese alloy, ferrochrome alloy, niobium vanadium alloy, ferrosilicon alloy and metallic copper;
[0043](3) After the alloy and metal copper are completely melted, continue to heat up to 1500-1520°C, and perform chemical composition analysis with a spectrometer. After the chemical composition analysis is qualified, heat up to 1550-1580°C, and keep at this temperatur...
Embodiment 3
[0049] A micro-alloyed high-strength gray iron casting, containing the following components in weight percentage: C3.48%, Si1.52%, Mn0.78%, Cr0.15%, Cu0.78%, Nb0.05%, V0.1% , Ti 0.02%, and the rest are iron and other unavoidable impurities.
[0050] The method for smelting the above-mentioned micro-alloyed high-strength gray iron castings comprises the following steps:
[0051] (1) Add charge and recarburizing agent into the hearth of the smelting furnace, heat up and melt;
[0052] (2) After the charge is completely melted, transfer it to the holding furnace, raise the temperature to 1450-1480°C and add ferromanganese alloy, ferrochrome alloy, niobium vanadium alloy, ferrosilicon alloy and metallic copper;
[0053] (3) After the alloy and metal copper are completely melted, continue to heat up to 1500-1520°C, and perform chemical composition analysis with a spectrometer. After the chemical composition analysis is qualified, heat up to 1550-1580°C, and keep at this temperatur...
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