980MPa-grade hot-rolled ferrite-bainite-over-textured steel and its fabrication method

摘要

The present invention relates to a hot rolled steel-ferrite-bainite steel having a composition ratio of C: 0.15 to 0.30%, Si: 0.8 to 2.0%, Mn: 0.001%, N: 0.006%, Nb: 0.01 to 0.06%, Ti: 0.01 to 0.05%, the balance Fe and unavoidable impurities , And satisfies the condition of 0.05%? Nb + Ti? 0.10% and 2.5? Al / C? 5.0. The microstructure of the steel is ferrite + bainite. The ferrite has an average particle size of 5 to 10 μm, an equivalent particle size of bainite of 20 μm, a yield strength of 600 MPa, a tensile strength of 980 MPa, and an elongation of 15%.