Electric Arc Furnace Steelmaking Technology Advances in Recent Years
Electric arc furnace steelmaking technology has made great progress in recent years. Following the upsurge of compact small steel mills in the 1960s, the situation of the joint venture has changed. In recent years, some short-process steelmaking plants using advanced technology integration have been produced.
(1) Cremona ESP endless strip rolling plant, Alvidi, Italy. The company has built the world's first set of ArvediESP endless rolling strip plants, including a 250t arc furnace, two 250t ladle refining furnaces and ESP endless rolling strip production line. The designed annual production capacity is 2 million tons, which can produce strip steel with a thickness of 0.8-12.0 mm and a width of 1590 mm.
(2) Crawford Zweil Plant of Newcastle Company, USA. In the reformed EAF steelmaking workshop, there is no heating device between the caster and the hot rolling mill. The strip passes through the hot rolling mill stand, i.e. the finished strip is 0.7-2.0 mm thick and 2,000 mm wide, with an annual design capacity of about 50,000 tons. Castrip process has high productivity and fine microstructures due to its high cooling rate, short solidification time and high drawing speed (usually 8O-1500m/min).
(3) Mesabi Nugget ITmk3 Plant, Kobe Iron and Steel Company, Japan.ITmk3 (IronTeChnology Mark), known as the third generation ironmaking process, is a coal-based direct reduction technology developed jointly by Kobe Iron and Steel Company of Japan and Midland Company of the United States to produce high-quality pig iron in converter hearth furnace. Molten iron can be obtained directly from pulverized coal. Using this technology, iron ore powder can be smelted into slag-free, homogeneous and nearly pure granular iron within 10 minutes.
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