Casting industry is an important part in the manufacturing industry and plays an important role in the development of the national economy, and also casting technology is an important part for manufacturing technology. Although China has become a major casting country in the world, output has ranked first in the world for 3 years, but it is far from being a powerful casting country. Where is the gap between China's foundry industry and the international advanced level? Where will the foundry industry go? People who concern “made in china” need think the problems that affect the casting products’ quality.
Casting is the base of pillar industries such as automobile, petrochemical, steel, electric power, shipbuilding, textile and equipment manufacturing. The advanced casting technology is the important content of advanced manufacturing technology. Statistics show that in 2002, Chinese casting capacity is 16 million 260 thousand tons that has been ranked first in the world for 3 years. Although China's casting output has leapt to a big casting country, but the overall quality, material structure, cost, energy consumption, benefits and clean production are far from powerful casting country.
The distance that our foundry industry compared with developed countries is mainly reflected in the casting’s basic quality,casting process and technical equipment. In terms of dimensional accuracy, Chinese castings are generally 1~3 grade lower than those of developed countries, and the surface roughness is 1~2 degrees higher than that of developed countries. For example, the roughness of engine block is 25 microns to 100 microns, and 12.5 microns to 25 microns abroad.The casting material, chemical composition, microstructure,performance level and stability are generally lower than those of developed countries. As to the appearance of castings, the gap between China and developed countries is relatively large.
Due to the gap in technology, energy and material consumption are higher than developed countries. Similar castings in China are 10% to 20% heavier than those in developed countries. The rate of casting process in China is 55% for steel castings, 64% for iron casting, 70% for non ferrous alloy casting.
Although our country has a brilliant history of casting, but in the face of the development of the world foundry industry, we should face up to the current situation and problems in our country, and adopt a series of effective measures to shorten the gap with developed countries and catch up with the international advanced level in line with the national conditions.