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Hot rolling method for thin gauge ultra-high silicon steel

A thin-gauge, silicon-steel technology, applied in the direction of metal rolling, metal rolling, rolling mill control devices, etc., can solve the problems of difficult hot rolling, high strip deformation resistance, poor plasticity, etc.

Active Publication Date: 2019-10-18
BEIJING SHOUGANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high content of Si, the deformation resistance of the strip steel is relatively large, the plasticity is poor, and the edge is prone to edge cracking, making hot rolling very difficult

Method used

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  • Hot rolling method for thin gauge ultra-high silicon steel
  • Hot rolling method for thin gauge ultra-high silicon steel
  • Hot rolling method for thin gauge ultra-high silicon steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Taking the production performance of the 1580 production line as an example, rolling Si+Als 4.6%-4.8%, 2.0mm high grade non-oriented silicon steel.

[0052] 1) Low-temperature furnace is adopted, and the furnace time is controlled for 220 minutes. The load adjustment and optimization of the furnace area is as follows:

[0053] a heating section Second heating section soaking section upper limit 1130℃ 1120℃ ——

[0054] 2) Rough rolling area, SSP is not used, rough rolling 1+5 mode, intermediate billet 35mm, single row for rough descaling, R1, R2 descaling disabled.

[0055] 3) Finishing area

[0056] a. Finishing area load control strategy

[0057] f1 f2 f3 f4 f5 f6 f7 Draft / % fixed fixed 43.3 32.8 23.3 19.1 11

[0058] The load of F1 and F2 two rolling mills is fixed, and the overall load is moved forward to reduce the difficulty of rolling.

[0059] b. Speed ​​difference compensation amount for steel dr...

Embodiment 2

[0077] Taking the production performance of the 1580 production line as an example, rolling Si+Als 4.6%-4.8%, 2.0mm high grade non-oriented silicon steel.

[0078] 1) Low-temperature firing is adopted, and the furnace time is controlled for 200 minutes. The steel-burning load in the furnace area is adjusted and optimized as follows:

[0079] a heating section Second heating section soaking section upper limit 1150℃ 1130℃ ——

[0080] 2) Rough rolling area, SSP is not used, rough rolling 1+5 mode, intermediate billet 35mm, single row for rough descaling, R1, R2 descaling disabled.

[0081] 3) Finishing area

[0082] a. Finishing area load control strategy

[0083] f1 f2 f3 f4 f5 f6 f7 Draft / % fixed fixed 45.3 32.6 25.0 20.2 13

[0084] The load of F1 and F2 two rolling mills is fixed, and the overall load is moved forward to reduce the difficulty of rolling.

[0085] b. Compensation amount of speed difference in ...

Embodiment 3

[0103] Taking the production performance of the 1580 production line as an example, rolling Si+Als 4.6%-4.8%, 2.0mm high grade non-oriented silicon steel.

[0104] 1) Low-temperature firing is adopted, and the furnace time is controlled for 260 minutes. The adjustment and optimization of the steel burning load in the furnace area is as follows:

[0105] a heating section Second heating section soaking section upper limit 1160℃ 1150℃ ——

[0106] One plus temperature is controlled according to the upper limit.

[0107] 2) Rough rolling area, SSP is not used, rough rolling 1+5 mode, intermediate billet 35mm, single row for rough descaling, R1, R2 descaling disabled.

[0108] 3) Finishing area

[0109] a. Finishing area load control strategy

[0110] f1 f2 f3 f4 f5 f6 f7 Draft / % fixed fixed 45.5 35.1 25.2 23.1 15

[0111] The load of F1 and F2 two rolling mills is fixed, and the overall load is moved forward to red...

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Abstract

The invention provides a hot rolling method for thin gauge ultra-high silicon steel. The method comprises the processes of casting blank heating, rough rolling, finish rolling and coiling, and is characterized in that the heating process comprises a heat recovery section, a preheating section, a primary heating section, a secondary heating section and a soaking section, wherein the temperature ofthe primary heating section is 1130 to 1160 DEG C, the temperature of the secondary heating section is 1120 to 1150 DEG C, and the same in-furnace time is 200 to 260 min; in the rough rolling process,a 1+5 rolling mode is adopted, the thickness of an intermediate blank obtained by rough rolling is 35 mm, and single coarse descaling is started; in the finish rolling process, 7 passes of rolling isadopted as finish rolling, seven rolling mills F1 to F7 are included, and the rolling mill load, the strip threading process, the rolling mill head winding torque, the rolling mill side guide plate offset, a small vertical roller and the cooling water quantity are controlled; and in the coiling process, position control over a coiling side guide plate is adopted.

Description

technical field [0001] The invention belongs to the field of hot-rolled silicon steel production, and in particular relates to a hot-rolling method for thin-gauge ultra-high silicon steel. Background technique [0002] Based on the needs of the new energy automobile and passenger vehicle industry, higher requirements are put forward for the mechanical and electromagnetic properties of non-oriented silicon steel. Since 2017, the development of products with Si content > 3.5% has been promoted. Si+Als 4.6%-4.8%, The content of silicon-aluminum alloy has broken through the industrial production limit of high-silicon content products in the industry, and the manufacturing difficulty is extremely high. According to the trial production situation, the thickness of the twenty-roller needs to be less than 2.1mm before rolling can be successful. The target thickness of the hot-rolled finished product is determined 2.0mm. Due to the high content of Si, the deformation resistance o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B3/00B21B37/74B21B37/72B21B37/00C22C38/02C22C38/06
CPCB21B3/00B21B37/00B21B37/72B21B37/74C22C38/02C22C38/06
Inventor 张转转王伦曹瑞芳王学强李树强任存杰陈俊男王海深
Owner BEIJING SHOUGANG CO LTD