The production efficiency and yield of continuous casting billet can be improved by this process, the cost is lower than other processes, and the process is time-consuming and green. Since 1940, continuous casting technology has been widely used since its emergence, and it has been widely used in the 1990s. Up to now, the continuous casting ratio of iron and steel industry in the world is more than 96%, and the continuous casting rate of non-ferrous metals is more than 90%.
Compared with the traditional, the billet produced by the new technology of horizontal continuous casting of cast iron has gained the advantages that the traditional process does not have. China has developed different specifications of cast iron profiles with diameters ranging from Φ 20 mm to Φ 400 mm and equivalent cross-sections such as square, rectangular and special-shaped sections, and has made breakthroughs in performance, with tensile strength greater than 350 MPa At the same time, the development of profiles is very rapid, not only can produce conventional grades, but also a variety of alloy ductile iron profiles have been widely produced. These new, high-performance products make the application of ductile iron profiles gradually expand. Some foreign industrial developing countries are applying ductile iron profiles to some general machinery, automobile and refrigeration industries.
According to the data summary released by the National Bureau of statistics, in 2016, China’s casting output accounted for 39% of the world’s total, with 47.2 million tons of casting production worth 589.5 billion yuan. About 34.15 million tons of iron castings were found in the castings, and the growth rate of nodular iron castings was about 4.76%. During the nine years from 2001 to 2010, the average annual growth rate of China’s casting output is 11%, and the output has occupied the first place in the world for more than ten years. After the 13th Five Year Plan period, the casting production rate in China decreased, with a growth rate of only 3.8% in 2014, and even a negative growth rate of 1.3% in 2015 and a growth rate of 3.51% in 2016. The number of nodular iron products in China is increasing. From 2013 to 2016, the output ratio of ductile iron to gray iron is about 1:1.77, 1:68, 1:1.60 and 1:1.54. Until 2019, China’s total production and sales of cast iron profiles will be 170000 tons.