Sheet Metal · 2022年9月22日

Mass production of vermicular graphite cast iron automotive engine and gearbox components

 

In China, FAW Wuxi Diesel Engine Factory and Dongfeng Motor Company have mass-produced vermicular graphite cast iron automotive engine and gearbox components. Austenitic bainite ductile cast iron is just like malleable cast iron is a derivative product of white cast iron heat treatment, while austenite ductile iron is a derivative product of ductile cast iron undergoing isothermal heat treatment. It can obtain high strength and certain toughness that other cast iron varieties cannot reach, and has attracted widespread attention in the academic community in recent years. There have been many researches and explorations on it, but its industrial application is still in its infancy. Because of its good prospects, according to the order of this article, it can be called the sixth cast iron variety mastered by mankind. Cast iron has so many varieties of different properties, so that it can meet many specific service requirements, and some are even more expensive than other materials. The advantages of low energy consumption of cast iron are now compared from the perspective of energy consumption. From the point of view of energy consumption, iron smelting from ore mainly uses coke fire smelting, and the energy consumption per kilogram of iron is about 45. While aluminum smelting mainly uses electrolysis, as late as 1 It was invented in the United States only 1 year ago. The energy consumption per kilogram of aluminum smelting is about $1245. For the energy consumption of iron smelting, a comparison between cast iron and steel is made from the perspective of energy consumption.

Cast Iron Expert Forum “Modern Cast Iron” and steel are both ferrous metals, with iron as the main material composition. Cast iron can be successfully reduced by only one step reduction process in the blast furnace, and consumes less energy. In order to obtain steel, two additional steps are required. Rolling steel ingots or continuous casting billets into steel consumes a lot of energy. The price advantage of cast iron The main raw material of cast iron is pig iron ingot. No metal raw materials are cheaper than pig iron ingots. Forgings use high-quality steel rods as raw materials, and the price of steel rods is about twice that of pig iron ingots. The main raw material for aluminum castings is aluminum ingots, and the current domestic market price is about twice that of pig iron ingots. Pig iron has a greater advantage in price comparison with magnesium, copper, and titanium. Another important factor when comparing raw material prices is the recycling of process waste.

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