Heating method for IF steel in ferrite rolling

A heating method and ferrite technology, applied in temperature control and other directions, can solve the problems of low quality of rolled products, achieve the effects of high surface quality of strip steel, optimize heating curve, and reduce energy consumption per ton of steel
CN106694567AActive Publication Date: 2017-05-24SHOUGANG JINGTANG IRON & STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHOUGANG JINGTANG IRON & STEEL CO LTD
Publication Date
2017-05-24

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Abstract

The invention provides a heating method for IF steel in ferrite rolling and is applied to the technical field of hot rolling. A slab is heated in a preheating section at the furnace temperature ranging from 500 DEG C to 800 DEG C till the temperature of the slab at an outlet of the preheating section ranges from 300 DEG C to 600 DEG C; the slab is heated in a first heating section at the furnace temperature ranging from 800 DEG C to 1100 DEG C till the temperature of the slab at an outlet of the first heating section ranges from 600 DEG C to 900 DEG C; the slab is heated in a second heating section at the furnace temperature ranging from 1000 DEG C to 1180 DEG C and in the atmosphere that the coefficient of excess air in the second heating section is smaller than 1 till the temperature of the slab at an outlet of the second heating section ranges from 900 DEG C to 1120 DEG C; and the slab is heated in a soaking section at the furnace temperature ranging from 1150 DEG C to 1250 DEG C and in the atmosphere that the coefficient of excess air in the soaking section is smaller than 1 till the temperature of the slab at an outlet of the soaking section ranges from 1060 DEG C to 1160 DEG C. The heating method solves the technical problem that when an existing hot rolling technology is applied to IF steel rolling, the quality of rolled finished products is low, and the overall quality of the rolled finished products is improved.
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Description

technical field

[0001] The invention relates to the technical field of hot rolling, in particular to a heating method for ferrite rolling of IF steel. Background technique

[0002] IF steel is widely used in the automobile manufacturing industry, especially the outer and inner panels of automobiles. With the rapid development of the automobile industry, its demand is increasing day by day, and it has great market prospects. At present, the IF steel produced by most steel mills is basically rolled in the austenitic region, and the tapping temperature is above 1200 °C. The fuel consumption of the heating furnace and the burning loss rate of the slab are at a high level, which affects the service life of the heating furnace. When the tapping temperature of the IF steel slab is lowered, on the one hand, the strip steel is prone to surface defects such as warped skins and edge cracks, which will affect the surface quality of the strip steel; on the other hand, the uniformity of t...

Claims

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