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Recently, Baosteel's cold-rolled sheet continuous annealing unit project, which was built by China Metallurgical Construction Co., Ltd., has worked hard for 20 months and successfully completed a three-day heat load test. The strip of this production line has a thickness of 0.15mm; the belt speed is 800m/min; the furnace temperature is 800°C, and the comprehensive process technology ranks the world's advanced level.