CCM first appear in 1950s, it is characterized by fast casting and focus investment. CCM technology was developing in a very fast speed. In Year 1970, CCM only took 5.6% all over the world, while the data reached 62.4% in Year 1990, and in some developed countries, it was even 95%. In recent years, many steel plants adapted CCM instead of mould casting. Until Year 1994, in total 24 countries are of full CCM now.
Compared with traditional mould casting, CCM can improve metal recycle rate and low down power consumption. CCM can make the melting work simple and short the melting time, in which way the production efficiency can improve in a large degree. Tundish is a middle progress of steel making, and it is the kep point which can decide continues casting or not. Furthermore, tundish would have a big effect on melten steel quantity and quality. Its functions are as following:
1. Diversion. For multi-strand CCM machine, the melten steel would be divided from tundish.
2. Continues casting. When multi-furnace continuous casting, tundish can be a holder when changing ladle.
3. Lowing down presure.
4. Protecting melten steel quality. Through using covering agent, long nozzle and other protecting device, tundish can help to protect the melten steel quality.