Interstitial free (IF) hot rolled strip and manufacturing method thereof

Abstract

The invention provides an interstitial free hot rolled strip and a manufacturing method thereof. The mass percents of the chemical constituents of the strip are as follows: 0<C<=0.005, 0<P<=0.018, 0<S<=0.015, 0<N<=0.004, 0<Si<=0.03, Mn 0. 10-0.20, Al 0.02-0.06, 0<Ti<=0.070, 0<Nb<=0.020, 0<Cr<=0.05, 0<Ni<=0.07, 0<Cu<=0.07, 0<Mo<=0.020 and the balance of Fe and other inevitable impurities. The manufacturing method comprises the steps of preparing continuous castings according to the constituent requirement and processing the continuous castings into the hot rolled strip. The manufacturing method of the strip comprises the following steps: A. preparing continuous castings to be desulfurized by liquid iron pretreatment, smelted in a top-bottom combined blowing converter, RH refined and continuously cast by heavy slabs; B. adopting the traditional hot continuous rolling process to process the continuous castings into the hot rolled strip; the finishing temperature is 880-930 DEG C; the hot rolled strip is quickly water-cooled to the temperature of 680-750 DEG C to be reeled up and then is cooled to the room temperature. The strip manufactured by the method has low strength, high plasticity and good processing technic.

Description

technical field

[0001] The invention relates to a hot-rolled steel strip without interstitial atoms and a manufacturing method thereof. Background technique

[0002] The automobile industry has always been the pillar industry of the economy in developed countries, and it is also an important industry in some developing countries. Since 2001, with the rapid development of my country's automobile industry, the demand for automobile steel has increased significantly. At present, the steel used in automobiles is still dominated by steel plates, of which the weight of steel plates for cars accounts for about 50% of the total weight of cars. Most of the steel plates used in car parts, such as steel plates for hoods, trunk lids, door panels, front and rear fenders, roof panels, underbody panels, and instrument panels, need to be stamped and formed, and in order to simplify the assembly of the car body, further To improve the overall performance and safety performance of cars, car...