Heating method of weak, micro-oxidation and oxidation combustion for ferrous metal steel slab

Abstract

A heating method of weak, micro-oxidation and oxidation combustion for ferrous metal steel slabs used in industrial furnaces with natural gas as a fuel. Excess air coefficients of a first heating section, a second heating section, and a soaking section of a heating furnace are set; in order to allow a display value of a residual oxygen analyzer to be within 1-4.5%, the excess air coefficients are set to be 1.1-1.2 for the first heating section, 0.96-0.99 for the second heating section, and 0.95-0.98 for the soaking section. The effect is realized that the natural gas combustion in the heating furnace hearth is incomplete combustion and complete combustion. The effect of complete combustion is realized in the first heating section of the heating furnace hearth, and the effect of incomplete combustion is realized in the second heating section and the soaking section. According to the invention, the atmosphere has a characteristic of micro-oxidizability after combustion in the heating furnace; the heating process of ferrous metal steel slabs in the second heating section and the soaking section is reduced; and less oxide scale is generated on the surface; the problem of steel plate surface depression caused by heating factors is reduced; energy saving is realized; the thickness of the oxide scale on the slab surface in the heating furnace hearth is reduced; and the defect of steel plate surface depression caused by heating factors is greatly reduced.

Description

technical field [0001] The invention belongs to the field of industrial furnaces for metallurgical processing. Specifically, the invention relates to a ferrous metal steel slab heating method. More specifically, the present invention relates to a ferrous metal steel slab heating method for weak, micro-oxidation and oxidative combustion. Method, the ferrous metal steel slab is weakly oxidized, slightly oxidized and oxidized combustion is heated using natural gas as fuel. Background technique [0002] As we all know, after the slab of ferrous metal steel is heated, iron oxide scale is formed on the surface; when the slab is rolled into a steel plate, after pickling, the surface of the steel plate has the problem of excessive scrapping due to pit defects or reduced service quality and service life. Or, after the slab of the ferrous metal steel is heated, more iron oxide scales are formed on the surface; the Mn13 slab is rolled into a steel plate, and the surface of the steel pl...

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Problems solved by technology

[0002] As we all know, after the slab of ferrous metal steel is heated, the iron oxide scale is formed on the surface; when the slab is rolled into a steel plate, the surface of the steel plate after pickling will be scrapped due to pit defects or the service quality and service life will be reduced.

Or, after the slab of the ferrous metal steel is heated, more iron oxide scales are formed on the surface; the Mn13 slab is rolled into a steel plate, and the surface of the steel plate is scrapped due to pit defects or the service quality and service life are reduced after shot blasting.

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