2250 hot continuous rolling producing method for improving surface quality of steel for automobile outer plate

A technology of surface quality and production method, which is applied to the production process of 2250 hot tandem mill for automobile outer plate steel, can solve the problems of complex influencing factors and difficult to control, and achieve the effect of eliminating oxygen pressure and improving the surface quality of products.

Active Publication Date: 2014-04-30
MAGANG (GROUP) HOLDING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, iron oxide scale surface defects are the most important as

Method used

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  • 2250 hot continuous rolling producing method for improving surface quality of steel for automobile outer plate
  • 2250 hot continuous rolling producing method for improving surface quality of steel for automobile outer plate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Pure molten steel is obtained by smelting, and it is continuously cast into a slab through a continuous casting machine. : 0.04~0.075;

[0031] Optimizing the heating process:

[0032] 1) Control the furnace atmosphere in the second heating section and the soaking section to be a reducing atmosphere (control the excess air coefficient at 1.05);

[0033] 2) Reduce the temperature of the furnace, the temperature of the furnace is 1170±20°C;

[0034] Optimized rolling process:

[0035] 1) The inlet and outlet of primary descaling water are all opened;

[0036] 2) When the target width is ≥1500mm, R13 pass + R25 pass is adopted for rough rolling, and the descaling water strategy between the roughing mill stands is selected for R1 to turn on 1, 3 passes, and R2 to turn on 1, 2, 3, 4 passes;

[0037] 3) When the target width is less than 1500mm, R13 pass + R23 pass is used for rough rolling, and the descaling water strategy between the roughing mill stands is selected for...

Embodiment 2

[0044] The relatively pure molten steel is obtained through smelting, and it is continuously cast into a slab through a continuous casting machine. Ti: 0.04~0.075; target size of hot rolled coil is 4.05mm×1629mm;

[0045] The continuous casting slab enters the heating furnace for heating, the first heating section is ≤1320°C, the second heating section is 1200±40°C, the excess air coefficient is 1.05±0.01, the soaking section is 1190±30°C, and the air excess coefficient is 1.05±0.01 , the temperature of the slab out of the furnace is 1170±20°C;

[0046] After the slab comes out of the furnace, it goes through a descaling box for descaling, and the inlet and outlet of the descaling water are all opened;

[0047] After the slab is descaled, the width of the slab is adjusted by a fixed-width press, and then enters the roughing mill for rolling; when the R13 pass + R25 pass is selected, the descaling water strategy between the roughing mill stands is selected. Open 1, 2, 3, 4 pa...

Embodiment 3

[0052] The relatively pure molten steel is obtained through smelting, and it is continuously cast into a slab through a continuous casting machine. Ti: 0.04~0.075; target size of hot rolled coil is 4.05mm×1414mm;

[0053]The continuous casting slab enters the heating furnace for heating, the first heating section is ≤1320°C, the second heating section is 1200±40°C, the excess air coefficient is 1.05±0.01, the soaking section is 1190±30°C, and the air excess coefficient is 1.05±0.01 , the temperature of the slab out of the furnace is 1170±20°C;

[0054] After the slab comes out of the furnace, it goes through a descaling box for descaling, and the inlet and outlet of the descaling water are all opened;

[0055] After the slab is descaled, the width of the slab is adjusted by a fixed-width press, and then enters the roughing mill for rolling; when the R13 pass + R23 pass is selected, the descaling water strategy between the roughing mill stands is selected to use R1 to open 1, ...

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Abstract

The invention relates to a 2250 hot continuous rolling producing method for improving surface quality of steel for an automobile outer plate. The method includes conducting smelting to obtain molten steel, casting the molten steel into a cast plate blank through a continuous casting machine, arranging the obtained continuous cast plate blank into a heating furnace to be heated, conducting descaling on the plate blank through a primary descaling box after the plate blank is discharged from the furnace, utilizing a width fixing press to adjust the width of the plate blank after the plate blank is descaled, conducting rolling on the plate blank through a coarse rolling machine, conducting descaling on the middle plate blank obtained through the coarse rolling through a secondary descaling box, rolling the plate blank through a finish rolling machine after the plate blank is subjected to secondary descaling, cooling the plate blank through a laminar cooling system after the plate blank is subjected to the coarse rolling and the finish rolling and finally conducting coiling on the plate blank through a coiling machine. By optimizing a heating process, primary sinter generation quantity is reduced, the rolling process is optimized, the descaling effect is improved, secondary and tertiary sinter generation quantity is reduced, and pressure oxygen generation probability is further reduced.

Description

technical field [0001] The invention belongs to the technical field of metal rolling, and in particular relates to a 2250 hot continuous rolling mill production process of steel for automobile outer plates. Background technique [0002] In recent years, with the further development of cold-rolled automobile sheets and home appliance sheets, their output has continued to increase, and the requirements for high surface quality of strip steel are particularly prominent. For the high-grade 05 plate, it is not only required that the oxide scale on the surface of the steel strip must be pickled and removed, but also that the surface is smooth and uniform. The main factors affecting the surface quality of hot-rolled strip steel are scarring, warped skin, inclusions, scratches, roll marks, iron oxide scale pressure and pitting, etc. Among them, iron oxide scale surface defects are the most important aspect, and the influencing factors are complex and difficult to control. Therefor...

Claims

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Application Information

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IPC IPC(8): B21B1/26B21B45/08
Inventor 赵勇游慧超闻成才张宇光赵伟隽王皓
Owner MAGANG (GROUP) HOLDING CO LTD
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