700MPa-grade hot-rolled coiled steel and production method thereof

The invention relates to the technical field of metallurgy, and particularly discloses 700MPa-grade hot-rolled coiled steel and a production method thereof. The 700MPa-grade hot-rolled coiled steel comprises the following components of, in percentage by weight, 0.23%-0.28% of C, 0.20%-0.40% of Si, 0.90%-1.15% of Mn, 0.22%-0.24% of V, 0.025%-0.040% of N, 0.25%-0.45% of Cr, 0.02%-0.04% of Nb, less than or equal to 0.035% of P, less than or equal to 0.035% of S, and the balance Fe and inevitable impurities, and the 700MPa-grade hot-rolled coiled steel is prepared through the procedures of steelmaking, continuous casting, heating, rolling and cooling. Through component adjustment and process optimization, the prepared hot-rolled coiled steel can meet the performance requirements of 700MPa-grade hot-rolled coiled steel, and has the advantages of higher strength, higher toughness, higher plasticity, low production cost, high production efficiency and wide application prospects. 本发明涉及冶金技术领域，具体公开一种700MPa级热轧盘螺钢及其生产方法。