Machining method for modifying spheroidal graphite cast iron well lid
A technology of nodular cast iron and a processing method, which is applied in the processing field of modified nodular cast iron manhole covers, can solve the problems of affecting the image of the city, the theft of cast iron manhole covers, the threat of people's travel, etc., and achieves improved inoculation effect, good compressive strength and no gap. sensitive effect
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[0012] A processing method for a modified nodular cast iron manhole cover is characterized in that it is made by the following steps:
[0013] 1) Add pig iron and scrap steel to the furnace for complete melting, add 0.5% Cu and 0.02% Sb for modification, until completely melted, then add silicon barium inoculant accounting for 0.5% of molten iron for the first inoculation treatment;
[0014] 2) Use the flushing method to add powder rare earth spheroidizer for spheroidization. Before spheroidization, preheat the spheroidization bag with molten iron for 5 minutes, and put the powder rare earth spheroidizer accounting for 1% of the mass of molten iron into the On one side of the spheroidizing bag dam, cover a layer of silicon-barium inoculant accounting for 0.3% of the mass of molten iron, and then cover a layer of low-carbon steel small iron sheet accounting for 0.5% of the mass of molten iron, and sprinkle a layer of slag on it. After pouring molten iron, cover the spheroidizin...
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