The shutdown and maintenance of steel mills increased sharply by 64 per cent in March, and the impact of molten iron rose to 2.06 million tons from 1.25 million tons in February. In March, the blast furnace maintenance of steel mills was mainly due to the fact that downstream demand had not yet fully recovered, and the stock of finished products in steel mills was relatively high. Steel mills take the initiative to overhaul. In the overhaul of steel mills, the phenomenon of overhaul of steel mills in March is more.