High-surface-quality and high-toughness hot rolled steel structure produced by adopting short flow and production method

The invention provides a high-surface-quality and high-toughness hot rolled steel structure produced by adopting short flow and a production method. The steel structure comprises 0.15-0.23% of C, 0.005-0.05% of Si, 0.20-1.20% of Mn, smaller than or equal to 0.020% of P, smaller than or equal to 0.010% of S, 0.010-0.045% of Als, 0.0005-0.0030% of B, smaller than 0.002% of N and the balance Fe and inevitable impurity. Compared with the prior art, the matrix structure of the steel structure is bainite and ferrite, the proportion of the bainite is 65-75%, the thickness is between 2.5 mm and 4.5 mm, the yield strength is between 400 MPa and 520 MPa, the tensile strength is larger than or equal to 530 MPa, ductility is larger than or equal to 24%, the product cost is low, the steel structure hasgood economy, the requirement for direct use is met, and the steel structure can also serve as a base plate for multiple kinds of cladding products plated with zinc and the like. 本发明提供了一种采用短流程生产的高表面质量高强韧性热轧结构钢及生产方法，成分C：0.15-