Shandong Xinyuantai Pipe Industry Co., Ltd. introduced the first part of the ductile iron pipe process: the ductile cast iron pipe is melted in the medium frequency induction furnace, the temperature does not need to be too high, the temperature can reach 1480 °C, and the molten iron should stay in the bag for a period of time to be sedated. Depending on the size of the workpiece, it can be poured between 1380 and 1410 °C. A ballcock (also balltap or float valve) is a mechanism or machine for filling water tanks, such as those found in flush toilets, while avoiding overflow and (in the event of low water pressure) backflow. The modern ballcock was invented by José Antonio de Alzate y RamÃrez, a Mexican priest and scientist, who described the device in 1790 in the Gaceta de Literatura Méxicana.[1] It consists of a valve connected to a hollow sealed float by means of a lever, mounted near the top of the tank. The float is often ball-shaped, hence the name ballcock. The valve is connected to the incoming water supply, and is opened and closed by the lever which has the float mounted on the end. When the water level rises, the float rises with it; once it rises to a pre-set level, the mechanism forces the lever to close the valve and shut off the water flow. This is an example of negative feedback and of proportional control. Ball Cock, Brass Ball Bibcock, Ballcock Valve, Toilet Ballcock Valve ZHEJIANG KINGSIR VALVE CO., LTD. , https://www.kingsir-valves.com
Second: The furnace lining can be acid or alkaline lining, and the lining ratio, knotting, drying and sintering are all performed according to the conventional process.
Thirdly, charging is generally carried out in the normal order. First, the refractory iron alloy such as gray pig iron, molybdenum iron, etc. is loaded into the bottom of the furnace, and then the scrap steel is loaded according to the principle of loosening on the bottom (helps to collapse).
Fourth: The melting temperature of the high-chromium cast iron is higher than that of cast iron, which is about 1200 °C. The tapping temperature is about 1500 °C. The medium-frequency induction furnace is used for smelting.
Fifth: Deoxidation After all the metal charge is melted and raised to 1480°C, ferromanganese, ferrosilicon, and aluminum are added for deoxidation.
Sixth: The electric power is transferred and melted. The power of the electric furnace is maximally melted. Due to the large smelting loss of Cr (about 5% to 15%), the ferrochromium should be added at the end, usually after the scrap is completely melted and then added into the reddish Ferrochrome.
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