Flattening and withdrawing-straightening method for strip steel

The invention relates to the field of plate strip rolling, in particular to a flattening and withdrawing-straightening method for strip steel. According to the flattening and straightening method for the strip steel, four kinds of methods for adjusting a flattening machine are utilized for adjusting warping of the strip steel, and the four kinds of adjusting means comprise the steps of adjusting the position of a stabilizing roller of the flattening machine, adjusting the rotating speed difference of a working roller of the flattening machine, adjusting the deviation of roll diameter of the working roller of the flattening machine, and adjusting the horizontal offset of the working roller of the flattening machine. In the flattening and withdrawing-straightening process, the four kinds of adjusting means are freely adopted, and setting of the flattening machine is completed until the warpage amount of the strip steel at an outlet of the flattening machine reaches the standard. The withdrawing-straightening deformation process is concentrated in the flattening and rolling process, the plate shape and the warping degree of the strip steel are effectively controlled at the same time, and the negative effect on the surface of the strip steel and the forming performance can be avoided. In addition, the production cost of the flattening and withdrawing-straightening working procedures of the cold-strip steel and the investment cost of unit equipment can be obviously reduced.