Continuous casting is considered to be one of the most important innovations in steel industry since it is first propagated by Henry Bessemer in 1846.It has many ben-efits,including(Ⅰ)increased yield,(Ⅱ)improved product quality,(Ⅲ)energy saving,(Ⅳ)less pollution,(Ⅴ)reduced costs,(Ⅵ)better working conditions,etc.Nowadays,more than 98%of crude steel output in the world is produced through the continuous casting process.