Wuxi Dongao Nonferrous Casting Co., Ltd.
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Application Of Smelting Control In Water Pump Castings
- Jul 12, 2017 -

(1) ingredient selection. In general, the wall thickness of the Water Pump Castings is not easy to form ferrite, which is easy to produce white mouth. And improve the silicon and carbon ratio can effectively prevent the mouth in the thin wall, is conducive to improving the water pump castings organization uniformity, strength, hardness, and can reduce the residual stress. However, when the carbon equivalent is high, the chance of ferrite in the cast iron structure is obviously increased, which is very unfavorable to improve the comprehensive performance of the Water Pump Castings. According to the production test, we determined: Wc = 3.1% ~ 3.3%, which control the carbon content is the core, when the carbon equivalent is high, may be appropriate to improve the manganese content, in this range can be stable to UHT200 requirements.

(2) charge requirements. I use 3t / h two rows of large spacing cupola for smelting, the use of locally produced coke and pig iron, can join 5% to 15% scrap. Scrap thickness ≥ 3mm, block diameter greater than the furnace diameter of 1/5, require rust treatment. The rest of the furnace block is not greater than the diameter of the furnace 1/3, in order to reduce the burning of silicon, try to use low silicon content of ferroalloy. To ensure the melting temperature, should be used to fix the carbon higher coke, and to ensure that the block between 90 ~ 130mm.

(3) melting operation. An important indicator of the quality of molten iron is the temperature of the molten iron, especially for high silicon carbon than cast iron, the melting temperature is high, is conducive to reducing the burning of silicon, but will increase the tendency to increase carbon. Therefore, it should be considered in the smelting, the appropriate increase in the bottom of the coke height, increase the air volume to improve the melting rate, control the tendency of molten iron to increase carbon. In the high-temperature iron liquid at the same time, the carbon content control in the ideal value range.