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Production method of high-chromium cast iron precise casting
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A technology for precision castings and high-chromium cast iron, which is applied in the casting field of cast iron precision castings, can solve the problems of high energy consumption, high production cost, high reject rate of high-chromium cast iron precision castings, etc. Improves the effect of surface and inner quality
Inactive Publication Date: 2016-08-31
WUXI UNIVERSAL PRECISION CASTING
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Summary
Abstract
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Problems solved by technology
In short, the high chromium cast iron precision castings produced by the above method have a high rejection rate of more than 60%, high energy consumption and high production cost.
Method used
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Effect test
Embodiment 1
[0016] Prepare pig iron, scrap steel and chromium first, and put the pig iron and scrap steel into the smelting furnace to smelt the first molten metal;
[0017] At the same time, the chromium is baked at a temperature of 800~850°C and kept at this temperature for 3 hours;
[0018] Afterwards, stop heating until the temperature of chromium drops to 760°C, add chromium into the melting furnace and melt together with the first molten metal until the chromium is completely melted to obtain the second molten metal;
[0019] Afterwards, carry out chemical analysis to the second metal liquid, make the carbon content in the second metal liquid be 2.3%, chromium content is 24%.;
[0020] Finally, the required high-chromium cast iron precision castings are casted by molds.
Embodiment 2
[0022] Prepare pig iron, scrap steel and chromium first, and put the pig iron and scrap steel into the smelting furnace to smelt the first molten metal;
[0023] At the same time, the chromium is baked at a temperature of 830 ° C and kept at this temperature for 2.5 hours;
[0024] Afterwards, stop heating until the temperature of chromium drops to 750°C, add chromium into the melting furnace and melt together with the first molten metal until the chromium is completely melted to obtain the second molten metal;
[0025] Afterwards, carry out chemical analysis to the second metal liquid, make the carbon content in the second metal liquid be 3.0%, chromium content is 25%.;
[0026] Finally, the required high-chromium cast iron precision castings are casted by molds.
Embodiment 3
[0028] Prepare pig iron, scrap steel and chromium first, and put the pig iron and scrap steel into the smelting furnace to smelt the first molten metal;
[0029] At the same time, the chromium is baked at a temperature of 850 ° C and kept at this temperature for 2 hours;
[0030] Afterwards, stop heating until the temperature of chromium drops to 740°C, add chromium into the smelting furnace and melt together with the first molten metal until the chromium is completely melted to obtain the second molten metal;
[0031] Afterwards, carry out chemical analysis to the second metal liquid, make the carbon content in the second metal liquid be 3.6%, chromium content is 26%.;
[0032] Finally, the required high-chromium cast iron precision castings are casted by molds.
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Abstract
The invention discloses a production method of a high-chromiumcast iron precise casting. The production method is characterized by comprising the steps that pig iron, scrap steel and chromium are prepared, and the pig iron and the scrap steel are placed in a smelting furnace to be smelted into first molten metal; at the same time, the chromium is baked at the temperature of 800-850 DEG C, and heat preservation is conducted for 2-3 hours at the temperature of 800-850 DEG C; heating is stopped till the temperature of the chromium is decreased to 740-760 DEG C, and the chromium is added into the smelting furnace to be smelted together with the first molten metal till the chromium is completely molten, so that second molten liquid is obtained; chemical analysis is conducted on the second molten metal, the carbon content of the second molten metal is made to be 2.3%-3.6%, and the chromium content of the molten metal is made to be 24%-26%; and the required high-chromium cast iron precise casting is formed through casting of a mold. By using the method for casting the high-chromium cast iron precise casting, energy consumption and production cost can be reduced. The method is suitable for casting of workpieces such as valve bodies.
Description
technical field [0001] The invention relates to a casting method. Specifically, it is a casting method for cast iron precision castings with high chromium content. It is suitable for the casting of workpieces such as valve bodies. Background technique [0002] At present, it is known in the foundry industry that the traditional casting method for high-chromium cast iron precision castings is to first put pig iron, scrap steel and chromium into a melting furnace to melt into molten metal. Carrying out chemical analysis on the molten metal again, so that the carbon content in the second molten metal is 2.3-3.6%, and the chromium content is 24-26%. Finally, the required high-chromium cast iron precision castings are casted by molds. Because the chromium content is as high as 24~26%, the chromium is easy to react with the air at high temperature and produces inclusions, which deteriorates the surface and internal quality of the casting, resulting in a scrap rate of more than ...
Claims
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Application Information
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