The survey results on April 13 showed that the average cost of molten iron excluding tax of mainstream sample steel mills in Tangshan this week was 3708 yuan / ton, the average cost of steel billet including tax was 4773 yuan / ton, and the weekly ratio was increased by 89 yuan / ton. Compared with the current ex factory price of ordinary billet of 4780 yuan / ton on April 13, the average gross profit of steel mills was 7 yuan / ton, and the weekly ratio was reduced by 169 yuan / ton.