Locally reinforced heating method and device for hot rolling steel billet before discharging

Abstract

The local heating process for reinforced heating rolled steel billet includes the following steps: calculating the temperature distribution of discharged steel billet; calculating the reinforced heating time for the steel billet inside the furnace; establishing local reinforced heating area or chamber in the last end of the heating furnace based on the calculated data and heating the local 200-300 mm long areas in two ends of the steel billet at the temperature 80-120 deg.c higher than the average furnace temperature for 20-30 sec. The local heating apparatus features its at least one pair of burning nozzles installed on two side walls or top of the local heating area for the reinforced heating. The present invention can reduce the surface temperature difference in the steel billet to be rolled, raise the rolling temperature homogeneity and raise rolling quality.

Description

technical field [0001] The invention relates to a reheating of a hot-rolled steel slab, in particular to a method and device for locally intensified heating of a hot-rolled steel slab before being discharged from the furnace. Background technique [0002] The steel billet needs to be heated before hot rolling. According to the existing technology, it is hoped that the temperature of the steel billet should be heated as uniformly as possible before the heating ends. However, the steel slab with uniform temperature out of the furnace is transported to the rolling mill through the roller table, and due to heat dissipation, the original steel slab with uniform temperature becomes uneven. In this phenomenon, the longer the conveying distance, the greater the cooling intensity of the surrounding environment of the roller table, and the more uneven the temperature of the billet when it enters the rolling mill. figure 1 , figure 2 It is the measured surface temperature distributi...

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Problems solved by technology

Such a temperature difference will cause rolling quality problems for steel types (silicon steel, etc.) that require high rolling temperature uniformity, and even difficulty in biting (such as when rolling wire rods), which will affect the rolling production.

At present, there is still no method and device that can solve this problem.

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