Sheet-billet produced hot-rolled pickled steel with thickness of 1.8mm or lower for automobile and production method thereof

The invention relates to a sheet-billet produced hot-rolled pickled steel with thickness of 1.8mm or lower for an automobile, which comprises the following chemical components by weight: 0.04-0.07% of C, 0.10-0.30% of Si, 0.60-1.30% of Mn, 0.025% of P or less, 0.012% of S, 0.02-0.04% of Ti and 0.010-0.030% of Als. The preparation method of the sheet-billet produced hot-rolled pickled steel with thickness of 1.8mm or lower comprises the following steps: desulphurizing molten iron, smelting by a converter, alloying, treating by a ladle furnace, casting and rolling continuously, dephosphorizing high-pressure water by controlling the pressure at 25-35Mpa, controlling rolling, cooling by laminar flow, curling, pickling by acid, levelling by controlling the extension rate at 2% or lower, and finishing by adopting static oil removal. The produced thin hot-rolled pickled steel for the automobile, which has the tensile strength of 400MPa or higher and the thickness of 1.8 mm or lower, has the characteristics of low yield ratio, high surface quality, short production cycle and low cost, achieve the match of high strength and good stamping performance and can replace the cold-rolled high-strength steel to manufacture the automobile.