Patent ID: 7789123
Filing Date: 2010-09-07
Classification: B22D

Abstract:
1. A sequence casting process for continuous production of a high-purity cast metal strand from a metal melt, the process comprising: feeding the metal melt from a melt vessel to a tundish; and discharging the metal melt from the tundish into a continuous-casting mold, the feeding of the metal melt into the tundish being interrupted during a change of melt vessel while the discharging of the metal melt into the continuous-casting mold is continued, wherein during a first period of time starting from a resumption of the feeding of the metal melt into the tundish until a point at which a quasi-steady-state operation bath level in the tundish is reached, an inflow rate into the tundish is greater than an outflow rate out of the tundish, and such that for 70% to 100% of the first period of time the inflow rate into the tundish is less than or equal to double the outflow rate out of the tundish, wherein the feeding of the metal melt into the tundish within the last 5% to 30% of the first period of time is continued and is performed at a reduced inflow rate compared with the inflow rate during a preceding time period of the first period of time such that by an end of the last 5% to 30% of the first period of time an unchanging filling rate of the tundish equal to a rate of the discharging of the metal melt from the tundish is attained.