Rolling line and relative method

Abstract

A rolling line (10) for the production of flat products (1 1 1) comprises a casting machine (12) suitable to continuously cast a thin slab (1 1), a temperature maintenance and homogenization unit (18), a rolling unit (22) comprising at least a double rolling stand (23a, 23b) of the Steckel reversing type downstream of the temperature maintenance and homogenization unit (18), at least a forming stand or roughing stand (20), directly connected immediately to the exit of the casting machine (12) and upstream of the temperature maintenance and homogenization unit (18), and suitable to reduce the thickness of the slab (1 1) just solidified.; The forming stand or roughing stand (20) is configured to perform an adaptive reduction of the thickness of the cast slab (1 1) smaller than or equal to about 65% at least as a function of the thickness, width and type of material of the finished flat product. The rolling unit (22) is configured to perform a reduction of the reduction of the thin slab (1 1) coming from the temperature maintenance and homogenization unit (18) to a thickness comprised between about 1.2 mm and about 20 mm by means of at most three double rolling passes through the double rolling stand (23a, 23b).

Description

technical field [0001] The present invention relates to a rolling line for the production of flat metal products such as strip or plate and an associated method. Background technique [0002] In order to produce more than 800,000 / 1,000,000 tons per year, known rolling lines for steel strip start with continuous casting of slabs and employ continuous finishing trains with several rolling stands. [0003] If casting from a thick slab with a thickness of more than 130mm, a reversible rough rolling unit is provided before the continuous finishing rolling unit, and if the starting slab is a thin slab with a thickness less than 130mm for direct rolling, the unit can be composed of 5 / 9 continuous stands are simply formed without the need for a roughing block. For production volumes of less than 800,000 / 1,000,000 tons / year, a Steckel type rolling mill with one or more reversing stands is generally used, typically feeding slabs with a thickness of 150mm to 250mm. [0004] Rolling ...

AI Technical Summary

Problems solved by technology

Thus, in order to obtain the final product with a minimum number of passes, according to the final thickness and width of the strip and the type of steel, the existing production line is not suitable, because the thickness of the slab entering the reversing rolling unit is not suitable. Not always ideal; therefore it is necessary to adjust the thickness of the cast slab, which negatively affects the stability of the casting process

Moreover, in order to minimize the number of rolling passes, the known production lines have to have high casting speeds and thus more severe working conditions

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