The invention relates to a process for producing a hot-rolled acid-pickled 610 L automobile frame steel strip with thin gauge and high elongation and belongs to the technical field of production processes of steel for automobiles. According to the technical scheme, the process specifically comprises a hot rolling production process and an acid
pickling process of an automobile frame steel strip, wherein the hot rolling process comprises the steps of heating, rolling, cooling and the like; and the acid
pickling process comprises the following steps of: performing three-section continuous
hydrochloric acid pickling and five-section
water rinsing on the automobile frame steel strip on a continuous acid pickling
production line so that the acid-pickled automobile frame steel strip with gray or offwhite surface and metallic luster on the surface can be obtained; next,
drying the surface of the acid-pickled automobile frame steel strip and electrostatically spraying anti-
rust oil on both sides of the steel strip, and then coiling and packing the automobile frame steel strip to obtain the finished product. The thin-gauge 610 L automobile frame steel produced by using the process disclosed by the invention is used for substituting 510 L automobile frame steel, so that the thickness of a used steel plate as well as the weight of the whole automobile and fuel consumption of the automobile are reduced while the strengths of the frame and related parts are improved; and therefore, the hot-rolled acid-pickled 610 L automobile frame steel strip provided by the invention plays an important role in reducing the weight of vehicles such as SUV (
Sport Utility Vehicle) vehicle and
pickup truck. Besides, the acid-pickled surface has metallic luster and thereby has excellent electrophoretic paint
coating performance.