Heating method for IF steel in ferrite rolling

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.

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...

Examples

Embodiment 1

[0050] Embodiment 1, the batch slab of embodiment 1 heats the slab through the heating method of IF steel that the embodiment of the present invention provides in ferrite rolling, and the parameter of each slab that actually obtains is as shown in table 1, table 1 The middle parameters are automatically recorded by the control equipment when heating the batch of slabs in Example 1. As can be seen from Table 1: the slabs are heated in the preheating section for 71 minutes to 76 minutes after entering the furnace, and the air excess coefficient is 1.2. The temperature at the outlet of the slab in the preheating section is 463°C-481°C, which does not exceed the range of 300°C-600°C. The slab is heated in the first heating section for 36 minutes to 40 minutes. The air excess coefficient is 1. The slab is heated in the first heating section. The temperature at the outlet of the section is 842°C to 870°C, which does not exceed the range of 600°C to 900°C; the slab is heated in the se...

Embodiment 2

[0053] Embodiment 2: embodiment 2 batches of slabs heat the slabs through the heating method of IF steel provided by the embodiment of the present invention in ferrite rolling, and the actual parameters of each slab are as shown in table 2, the parameters of table 2 It is recorded automatically by the control equipment when heating the batch of slabs in Example 2. It can be seen from Table 2: after the slabs are put into the furnace and heated in the preheating section for 70 minutes to 78 minutes, the air excess coefficient is 1.2, and the slabs are at The outlet temperature of the preheating section is 505°C-580°C, not exceeding the range of 300°C-600°C; the slab is heated in the first heating section for 41 minutes to 47 minutes, the air excess coefficient is 1.02, and the outlet temperature of the slab in the first heating section is 935 ℃~957℃, not exceeding the range of 600℃~900℃; the slab is heated by the second heating section for 42 minutes to 48 minutes, the air exces...

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...

Examples

Embodiment 1

[0050] Embodiment 1, the batch slab of embodiment 1 heats the slab through the heating method of IF steel that the embodiment of the present invention provides in ferrite rolling, and the parameter of each slab that actually obtains is as shown in table 1, table 1 The middle parameters are automatically recorded by the control equipment when heating the batch of slabs in Example 1. As can be seen from Table 1: the slabs are heated in the preheating section for 71 minutes to 76 minutes after entering the furnace, and the air excess coefficient is 1.2. The temperature at the outlet of the slab in the preheating section is 463°C-481°C, which does not exceed the range of 300°C-600°C. The slab is heated in the first heating section for 36 minutes to 40 minutes. The air excess coefficient is 1. The slab is heated in the first heating section. The temperature at the outlet of the section is 842°C to 870°C, which does not exceed the range of 600°C to 900°C; the slab is heated in the se...

Embodiment 2

[0053] Embodiment 2: embodiment 2 batches of slabs heat the slabs through the heating method of IF steel provided by the embodiment of the present invention in ferrite rolling, and the actual parameters of each slab are as shown in table 2, the parameters of table 2 It is recorded automatically by the control equipment when heating the batch of slabs in Example 2. It can be seen from Table 2: after the slabs are put into the furnace and heated in the preheating section for 70 minutes to 78 minutes, the air excess coefficient is 1.2, and the slabs are at The outlet temperature of the preheating section is 505°C-580°C, not exceeding the range of 300°C-600°C; the slab is heated in the first heating section for 41 minutes to 47 minutes, the air excess coefficient is 1.02, and the outlet temperature of the slab in the first heating section is 935 ℃~957℃, not exceeding the range of 600℃~900℃; the slab is heated by the second heating section for 42 minutes to 48 minutes, the air exces...

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