Since 2000, casting supplies production in China has been the highest in the world for 11 consecutive years. However, this kind of first state is behind many inharmonious. The casting scrap rate in most foundry enterprises in our country is multiplied above the level of developed countries. Esperially, the casting defects caused by poor quality of casting supplies and scrap situation happen incessantly.
So, struggles on the quality of casting supplies should be persistant. With the guarantee on the quality of casting supplies, we can make the high quality castings which will lead to powerful casting country.
Nowadays, there are new requirements for casting supplies in large iron foundry industry. Casting industry is such kind of industry with large cast, especially for large-sized casting whose quantity of materials is much higher than the number of small-sized castings!
So the price of casting materials determines the casting cost. For example, the resin sand which substitue the clay sand in modelling process, although its performance is better than clay sand, its price problem becomes the important factors that affect the cost of casting supplies. Only with quality assurance as well as cost reduction in production of casting supplies, China’s foundry industry can have strong competitiveness in the world.
Faced with the increasingly serious energy and environmental crisis, lightweight has become an important direction of the casting supplies and components industry development.Therefore exports are constantly committed to the development and utilization of materials with light weight and high strength，such as steel with high strength and aluminum magnesium alloy materials. Because of a series of excellent properties, aluminum alloy materials have become one kind of the most ideal auto lightweight materials.
In recent years, aluminum castings has developed rapidly. In 2007, the output of aluminum castings in China was 2.24 million ton, in which the castings produced by high pressureaccount for nearly 50%. Demand growth of aluminum castings has promoted the development of foundry enterprises who produce casting supplies, but the environmentalproblem and extensive energy consumption have become potential threat.
Green casting is the inevitable direction of foundry enterprises. It has a profound impact on the production of casting supplies and the development of the industry. In the process of machining casting products, workers need to pay special attention to these problems, such as processes which affect the mechanical properties and processability, corrosion resistance, air tightness and surface quality. Therefore, in order to survive and maintain high competitiveness, foundry enterprises must exert great effort all-around to realize the green casting.
Exports about casting supplies are growing rapidly in recent years . Our country has become a big producer for casting supplies. But in many areas there is a certain gapbetween our country and some developed countries, such as the application of cast supplies. Casting supplies in our country has finished the transition from a planned economy to market economy. We have become the fastest growing country with a modern commodity market for casting supplies in the world. The production and supply of casting materials in quantity can basically satisfy the needs of the rapid growth for casting production in our country. But from the quality、renewable utilization of resources and environmental protection price terms， we still need further improvement compared with industrialized countries.
With the rapid development of car manufacturing and wind power industry, it has put forward higher requirements for casting quality to produce high quality castings. That means we need high quality casting supplies. Because the technology of iron smelting in our country is not as well as some advanced countries, so far in terms of purity, there is a great gap compared with foreign high-quality pig iron. Pig iron with poor quality has become an important factor of restricting our large iron casting production.