| 摘要 |
The invention relates to a method of producing a cold-rolled band of dual-phase steel with a ferritic/martensitic structure. The inventive method consists in hot rolling a slab having a chemical composition which comprises, by weight, 0.01%С0.1%, 0.05%Mn1%, 0.01%Cr1%, 0.01%Si < 0.5%, 0.001%P0.2%, 0.01%Al0.1%, N0.01%, the remainder being iron and impurities resulting from the preparation thereof. The method also comprises the following subsequent steps consisting in: hot winding the band obtained at a temperature of between 550 and 850°С; cold rolling the band with a reduction ratio of between 60 and 90%; annealing the band continuously in the intercritical region; cooling said band to ambient temperature, in one or more steps, the rate of cooling between 600°С and ambient temperature being between 100°C/s and 1500°C/s; and, optionally, tempering same at a temperature of less than 300°С. The aforementioned annealing and cooling operations are performed such that the end band comprises between 1 and 15% martensite. The invention also relates to the steel band thus formed. |
