Productivity and Product Quality in Continuous Casting Machine Jun25

Productivity and Product Quality in Continuous Casting Machine...

Productivity and Product Quality in Continuous Casting Machine Continuous casting is the process by which liquid steel is solidified into a semifinished steel product (billet, bloom, or slab etc.) for subsequent rolling in the hot rolling mills. Continuous casting of liquid steel was introduced for commercial application in 1950s. In the relatively short time span since the introduction of continuous casting for the commercial application, the process has evolved with a wide variety of new process developments directed towards achieving improved productivity and superior product quality. These developments include new design concepts of continuous casting machines, metallurgical practices, and the application of process control and automation by computer systems. The main driving force behind these developments has been the recognition that substantial improvement in the yield and energy savings are possible which have a dramatic effect on operating cost. Through these developments, it has been possible to achieve major quality improvements of the continuous cast product.  Present day continuous casting machines produce cast steel products having quality which is fully equivalent to and exceeds that of products produced from ingot steel. Modern continuous casting machines efficiently produce essentially all grades of steels, including the highest qualities for critical applications. Productivity improvement The two methods to improve the productivity of the continuous casting process include improving the continuous casting machine throughput (tons/hour) and net-working ratio. The through put of the continuous casting machine is improved by increasing the casting speed as well as by increasing the cross sectional area, while the net- working ratio is improved by decreasing the casting machine down time. The casting speed of the continuous casting machine is limited by several different phenomena as given below. A high casting speed results in a significant increase in the flow velocity of the...