The scale of steel production equipment and enterprises has been growing toward large scale. For example, around 1870 British blast furnaces produced an average of 25 tons of iron per day, increased to more than 800 tons in 1969, and increased to 1,370 tons in 1979. In 1980, Japan produced an average of 3,660 tons of iron per day for blast furnaces. In June 1981, there were 126 blast furnaces with more than 2000 cubic meters in the world, 45 more than 3000 cubic meters, and 4,000 cubic meters with 23 of the world's steel industry and three of 5000 cubic meters. The average production capacity of each oxygen top-blowing converter in Japan was only 430,000 tons in July 1962. It increased to 1.18 million tons in December 1972 and increased to 1.4 million tons in June 1982; the world's hot strip rolling mill The annual production capacity, most of which were built before 1960, was below 2 million tons. The high-level rolling mill put into operation in the 1960s was 350 to 4.5 million tons, and the modern rolling mill built in the 1970s was up to 5 to 6 million tons.
The recent large-scale equipment and automation have led to a rapid increase in the production scale of iron and steel conglomerates. In 1980, 10 million tons of steel were produced. In 1980, there were about 50 steel mills with an annual output of more than 5 million tons of steel in the world, including 14 Soviet Union and Japan. 13, the United States 6. The largest steel plant with an annual output of steel is the Fukuyama Plant of the Japanese Steel Pipe Company. In 1976, the steel production reached 19.19 million tons. The largest cumulative steel production was the Soviet Magnitogorsk Steel Company (actually a steel plant). By February 1982, it produced 370 million tons of steel, followed by the New Japan Steel Corporation gossip plant, and the communist steel production in early 1982. 220 million tons. The largest production in the world is the New Japan Steel Corporation. In 1973, it produced 41.07 million tons of steel. From the establishment of the plant to the 95 years of early 1982, the cumulative steel production reached 650 million tons. At the same time as large-scale iron and steel enterprises, small and medium-sized steel companies, especially small steel mills, continue to develop. By the beginning of 1981, there were 280 small steel mills around the world, and the annual steel production capacity was about 60 million tons. In the United States in early 1982, the small steel mill had an annual steel production capacity of more than 20 million tons, and its steel production accounted for about 15% of the country's total steel output.
