The invention discloses an acid-washing hot-rolled low-
carbon steel without
line defects on the surface and a production method thereof. The hot-rolled low-
carbon steel consists of the following components in percentage by weight: 0.02 to 0.12 percent of C, 0.05 percent or less of Si, 0.10 to 0.60 percent of Mn, 0.015 percent or less of P, 0.010 percent or less of S, 0.10 percent or less of Cu, 0.10 percent or less of Ni, 0.05 percent or less of Cr, 0.010 to 0.070 percent of Als, 0.010 percent or less of Sn, 0.010 percent or less of As, 0.010 percent or less of Sb and the balance of iron; moreover, As plus Sn plus Sb are less than or equal to 0.015 percent, and the ratio of Ni to Cu is greater than or equal to 0.5. The production method of the hot-rolled low-
carbon steel includes the following steps: after molten iron desulfurization and converter blowing, a raw sheet billet of the hot-rolled low-carbon steel is obtained, and the raw sheet billet of the hot-rolled low-carbon steel sequentially is subjected to
continuous casting, heating, scale removal before rough rolling, rough rolling, finish rolling, laminar flow cooling, rolling, fan cooling and acid-washing. While the
mechanical property of the steel is guaranteed by the components of the raw steel, the surface defects of the acid-washinghot-rolled low-carbon steel are reduced, consequently, the surface quality of the steel is greatly increased, and economic loss is reduced.