Hot-rolled dual-phase steel for automobile wheel and production method of hot-rolled dual-phase steel

The invention discloses hot-rolled dual-phase steel for an automobile wheel and a production method of the hot-rolled dual-phase steel, and belongs to the technical field of dual-phase steel. The technical problems that in the prior art, the cost of hot-rolled dual-phase steel is high, accurate control over the cooling process cannot be achieved through an existing hot continuous rolling production method, and good surface quality cannot be guaranteed are solved. The hot-rolled dual-phase steel for the automobile wheel comprises, by mass percent, 0.05%-0.10% of C, 0.10%-0.25% of Si, 1.20%-1.40% of Mn, 0.50%-0.60% of Cr, 0.035%-0.070% of P, not larger than 0.010% of S and the balance Fe and inevitable impurities. According to the hot-rolled dual-phase steel, a low-silicon molybdenum-free Mn-Cr-P component system is adopted, and the surface quality problem brought by high silicon is solved; through control over the primary cooling temperature, the air cooling time and the secondary cooling speed and temperature