According to the appearance of the stomata, the copper sleeve manufacturer judges that it is subcutaneous stomata and is divided into two types, one is the shiny subcutaneous stomata, and the other is the black slag stomata. What should I do if there are subcutaneous pores in the ductile iron parts processed by the copper sleeve manufacturer?
The pores formed by the reaction between molten metal and mold (including sand, sand core, paint, cold iron), molten metal and molten slag, or some elements and compounds in the molten metal are called reverberant pores. These pores are generally Located under the surface of the casting, the copper sleeve processing is called pinhole or subcutaneous pore. When the spheroidal graphite cast iron is molded with tidal sand, the gas in the pore is H2S, H2, magnesium vapor, etc. This is the reason for the first type of pore.
The second type of slag pores, we analyze it is formed by the oxidation of molten metal. Based on the above analysis, we have conducted a comprehensive analysis of various processes such as smelting and pouring, core making, sand processing, and modeling, and formulated corresponding solutions for the problems found.
Decrease the amount of spheroidizing agent, reducing the amount of spheroidizing agent from 1.7% to 1.5% of the amount of molten iron, strictly control the Mg content, and must adhere to wMg<0.05%. Strictly dry the ladle and inoculant, and properly dry the nodulizer and inoculant to ensure that it is dry to the greatest extent.
Use silicon barium inoculant to replace the current silicon strontium inoculant, and the amount of participation remains unchanged. Increase the pouring temperature, and increase the pouring temperature from 1360-1370°C to 1380-1390°C. Copper sleeve processing speeds up the speed of tapping and rewinding, and minimizes the possibility of molten iron being oxidized.
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