A kind of continuous casting and rolling endless rolling method of thin strip steel and rolling production line thereof

Abstract

The invention belongs to the technical field of continuous casting and rolling of iron and steel, and relates to a continuous casting and rolling endless rolling method of thin strip steel and a rolling production line thereof, which include successively connected continuous casting machines, rough rolling units, pendulum shears, and waste billet pushing out. And stacking device, heating device Ⅰ, pre-finishing rolling unit, heating device Ⅱ, emergency shear, finishing rolling unit, ultra-fast cooling device, laminar cooling device, high-speed flying shear and coiling unit, in which heating device Ⅱ realizes the intermediate billet The switching of temperature required for II austenitic rolling and ferritic rolling, the selection of 3 to 4 finishing stands makes it easier to control the starting rolling temperature when the intermediate billet II is ferritic rolling, and the heating device is reasonable Temperature control enables both austenitic rolling and ferritic rolling to produce strip steel on the same production line, enhancing the market competitiveness of thin strip steel.

Description

technical field [0001] The invention belongs to the technical field of continuous casting and rolling of iron and steel, and relates to a thin strip steel continuous casting and rolling endless rolling method and a rolling production line thereof, in particular to a method for realizing austenitic rolling and ferrite rolling on the same production line. The invention discloses a continuous casting and rolling endless rolling method and rolling production line of thin strip steel for body rolling. Background technique [0002] Since 1989 when Nucor Steel Corporation of the United States built and put into operation the world's first CSP production line, the continuous casting and rolling process technology has achieved rapid development for decades. The ISP technology of the German Demark Company and the CONROLL technology of the Austrian voestalpine Company , Japan's Sumitomo's QSP technology, Italy's Danieli's FTSR technology, and Italy's Arvedi's ESP technology have been l...

AI Technical Summary

Problems solved by technology

At present, there are some patents related to the application of ferritic rolling technology to ESP production line, but there are many problems in these patents when realizing true ferritic rolling. It is extremely difficult to control the starting rolling temperature of plain body rolling. If the starting rolling temperature is low, descaling will be unfavorable, while ESP only relies on descaling before finishing rolling, which will cause defects in the surface quality of the strip and bring subsequent genetic defects. The coiling temperature is too low, which is contrary to the concept of high-temperature coiling; if descaling is considered, the starting rolling temperature will be increased, and multiple stands will be in the austenitic-ferrite dual-phase region during the finishing rolling of the strip. Rolling, prone to mixed crystal phenomenon, affecting the mechanical properties of the product

[0005] In addition, some patents have developed specialized ferritic rolled thin strip steel production lines, but due to the limited product varieties and specifications that can be produced, the ability to resist market fluctuations is poor

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