Continuous Casting Slab Heating Process for Regenerative Roller Hearth Heating Furnace

Abstract

The invention relates to a process for heating continuous casting slabs by a regenerative roller-hearth type heating furnace and belongs to the technical field of process for heating slabs by a heat-accumulation heating furnace. The process is used for rapidly heating continuous casting thin slabs. According to the technical scheme, the various functional segments of the roller-hearth type heating furnace are divided into a first heating section, a second heating section, a third heating section, a slab traversing section and a thermal-insulation section, a regenerative combustion technology is adopted in each section, and the temperature of the first heating section as a main heating section is raised to 1230 DEG C, the temperature of the second heating section as an auxiliary heating section is raised to 1210 DEG C, the temperatures of the other sections are also raised to 1190 DEG C, the soaking process is completed, and the final tapping temperature is 1180+ / -5 DEG C. According to the process disclosed by the invention, the heating speed and soaking capability of the roller-hearth heating furnace can be improved, rapid heating and temperature-equalizing processes of slabs in the roller-hearth heating furnace are achieved, and the production of products each of which the thickness is 1.0-1.4mm in a double-strand mill is realized, meanwhile, the energy utilization rate is high and the energy-saving effect is remarkable.

Description

technical field [0001] The invention relates to a production process for realizing rapid heating of continuous casting slabs by using a regenerative roller hearth heating furnace on a continuous casting and rolling production line, and belongs to the technical field of slab heating technology of regenerative heating furnaces. Background technique [0002] The biggest advantage of the thin slab continuous casting and rolling production line is that it can produce strip steel products with a thickness less than or equal to 1.8mm. Compared with the conventional hot-rolled wide strip production line, the production cost is low and it has obvious economic advantages. [0003] When the rolling mill produces thin-gauge products, the rolling mill has very high requirements on the temperature and uniformity of the slab out of the furnace. Generally speaking, when producing strip steel with a thickness of about 2.0mm, the temperature of the slab out of the furnace is ≤1150°C, which can...

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Problems solved by technology

[0006] 1. The furnace temperature of the first heating section of the roller hearth heating furnace will exceed 1300°C, which exceeds the rated heating load of the roller hearth heating furnace. Since the inner width of the roller hearth heating furnace is only two meters, in the narrow furnace, a large amount of gas is supplied. There will be incomplete combustion, there will be safety hazards, and the effective utilization rate of gas will be reduced;

[0007] 2. As the heating load increases, the length of the flame will also increase accordingly. Usually, the height of the centerline of the burner of the roller bottom heating furnace is only 0.4 meters from the upper surface of the slab. A long flame will burn the surface of the slab, resulting in overheating, overburning, etc. Quality defects, and greatly increase the oxidation and burning loss of slabs;

[0009] 4. After the slab is heated in the first heating section, since the furnace temperature of other heating sections is lower than the actual demand value, the temperature of the slab will drop in other sections, which will also reduce the thermal efficiency of the heating furnace;

[0011] In short, the existing roller hearth heating furnace and its heating process are difficult to meet the continuous and stable production of thin-gauge products in the thin slab continuous casting and rolling production line.

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