The way of speeding up development of continuous casting in P.R.China

摘要

In China, continuous casting has been developed for a long time, but the process of development is not a smooth one. Before 1980's, the development was very slow. Only 25 casters have been built with a total capacity of 3.45 million tons a year from 1958 to 1980. In 1980, the productivity of continuously cast steel was about 2.30 million tons and the CC ratio was 6.18 percent. Only 24 casters were built from 1981 to 1985. The CC ratio was increased by less than 1percent per year and reached 10.83 percent in 1985. Based on the experiences and lessons obtained, a strategy of developing continuous casting more intensively had been set up. In 1988, the first national conference on continuous casting was held, on which, the productive technical policy of developing continuous casting was put forward firstly, and continuous casting in China was put onto the track of acceleration. This conference was critical in development of continuous casting. The productivity of continuously cast steel reached 10 million tons for the first time in 1989. From 1990, the growth rate of continuous casting in China has reached the highest level of main steel producing countries. From 1988 to 1996, the productivity of continuously cast steel has been increased by 5.63 million tons per year in average, that is higher than that of the crude steel production-5.21 million tons per year, and the CC ratio has been increased by an average of.4.81 percent per year. In 1996, the output of continuously cast steel amounted to 53.77 million tons and CC ratio to 53.18 percent. In this year, the increment of continuously cast steel reached 9.45 million tons for the first time, the CC ratio was increased by 6.7percent and reached record peak value (Shown in table 1 figure 1).