The Use Of Castings Has Been Expanding

- Aug 14, 2017 -

The use of castings is very extensive, has been used to hardware and the entire machinery and electronics industry, and its use is becoming a growing trend. Concrete use, construction, hardware, equipment, engineering machinery and other large machinery, machine tools, ships, aerospace, automobiles, locomotives, electronics, computers, electrical appliances, lamps and other industries, many are ordinary people contact all day, but do not know the metal objects.

In gray cast iron, the carbon quality fraction is controlled in the range of 2.7% ~ 3.8%, the carbon is mainly in flake graphite form, the microstructure of high carbon gray cast iron is ferrite and coarse flake graphite, the mechanical strength and hardness are lower, but the deflection is better; Casting Parts the microstructure of low carbon gray cast iron is pearlite and fine flake graphite, which has higher mechanical strength and hardness, but the deflection is poor. Because the composition of gray iron is located near the eutectic point, Casting Parts so it has good casting performance, for the eutectic range of gray cast iron, increase in carbon content can improve liquidity, conversely, for the hypereutectic range of gray cast iron, only to reduce the carbon content to improve liquidity. In ductile iron, the quality fraction of carbon is controlled in the range of 3.5% ~ 3.9%, the quality fraction of carbon is usually reduced by 0.1% ~ 0.3% when the ball is treated, and the carbon is mainly in the form of spherical graphite, after graphite is spherical, the influence of graphite quantity on mechanical properties is not very important, but in order to improve casting performance, carbon always keeps high line, and the expansion of graphite is used to compensate shrinkage, Casting Parts increase the density of castings, and ensure high mechanical properties of castings. In the eutectic composition above, the increase of carbon content is easy to produce graphite floating, reducing mechanical properties; Under the Eutectic component, increasing the carbon content can increase the absorption rate of magnesium, which is advantageous to the ball, but the reduction of carbon content is easy to produce free cementite, which can reduce the mechanical properties.

With the continuous development of the industry of various material castings in its role more and more important, it is understood that in recent years, the production of aluminum alloy ductile iron castings in China has been rising year by year, the development is very rapid, Casting Parts casting application is extensive, especially in the automotive industry, the demand for castings is very considerable.

First of all, in light of the trend of automotive lightweight, the casting market has a huge demand, and with the rapid development of the automotive industry in recent years, the demand for castings rapidly increased, which greatly promoted the development of China's casting industry, Casting Parts thus increasing the demand for castings. Secondly, due to the development of global die-casting industry, the demand for castings in various industries is increasing. Third, in the global economic integration trend, driven by the global die-casting production center gradually shifted to China, coupled with China's unique labor force and aluminum resources advantage, the domestic die-casting industry shows a rapid development trend.