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Method for preventing hot rolling edge fractures in oriented silicon steel

A technology of grain-oriented silicon steel and edge cracking, which is applied in the field of preparation technology of grain-oriented silicon steel, can solve the problems affecting cold-rolled production and strip breakage, and achieve the effects of reducing thermal stress, preventing edge-cracking defects and preventing internal cracks during hot-rolling.

Active Publication Date: 2015-04-15
ANYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For hot-rolled steel coils with cracked edges, all the cracked edges must be cut off during cold rolling, otherwise there will be a broken strip accident, which will affect the production of cold rolling

Method used

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  • Method for preventing hot rolling edge fractures in oriented silicon steel
  • Method for preventing hot rolling edge fractures in oriented silicon steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Send the slab into the heating furnace, control the temperature of the slab entering the heating furnace to be higher than 400°C, and the temperature of its corner is not lower than 550°C, the temperature of the preheating section of the heating furnace is 950°C, and the temperature of the first heating section is 1050°C , the temperature of the second heating section and the soaking section is controlled at 1250°C. After the slab is heated, rough rolling is carried out, and the reversible rough rolling mill is used for rolling 5 times until the thickness of the slab is 40mm, and then the finish rolling is carried out. The 7-stand finishing rolling unit rolls 7 passes, and the rough-rolled slab is rolled into a hot-rolled steel coil with a thickness of 2.5mm. The temperature of the rough rolling process is 1050°C; ℃, and the finish rolling temperature is 900℃. The tension between frame 1 ~ frame 2 is controlled at 4.0MPa, the tension between frame 2 ~ frame 3 is control...

Embodiment 2

[0024] Send the slab into the heating furnace, control the temperature of the slab entering the heating furnace to be higher than 400°C, and the temperature of its corners should not be lower than 550°C, the temperature of the preheating section of the heating furnace is 1050°C, and the temperature of the first heating section is 1150°C , the temperature of the second heating section and the soaking section is controlled at 1320°C. After the slab is heated, rough rolling is carried out, and the reversible rough rolling mill is used for rolling 5 times until the thickness of the slab is 38mm, and then the finish rolling is carried out. The 7-stand finishing rolling unit rolls 7 passes, and the rough-rolled slab is rolled into a hot-rolled steel coil with a thickness of 2.3mm. The temperature of the rough rolling process is 1150°C; ℃, and the finish rolling temperature is 1000℃. The tension between frame 1 ~ frame 2 is controlled at 4.0 ~ 4.5MPa, the tension between frame 2 ~ fr...

Embodiment 3

[0026] Send the slab into the heating furnace, control the temperature of the slab entering the heating furnace to be higher than 400°C, and the temperature of its corner is not lower than 550°C, the temperature of the preheating section of the heating furnace is 1000°C, and the temperature of the first heating section is 1000°C , the temperature of the second heating section and the soaking section is controlled at 1300°C. After the slab is heated, rough rolling is carried out, and the reversible rough rolling mill is used for rolling 6 times until the thickness of the slab is 39mm, and then the finish rolling is carried out. The 7-stand finishing rolling unit rolls 7 passes, and the rough-rolled slab is rolled into a hot-rolled steel coil with a thickness of 2.3mm. The temperature of the rough rolling process is 1100°C; ℃, and the finish rolling temperature is 950℃. The tension between frame 1 ~ frame 2 is controlled at 4.0 ~ 4.5MPa, the tension between frame 2 ~ frame 3 is ...

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Abstract

The invention belongs to the field of preparation technology of oriented silicon steel, and in particular relates to a method for preventing hot-rolled edge cracking of oriented silicon steel. The method includes temperature control of the heating furnace and the rolling process, controlling the temperature of the corner of the oriented silicon steel slab before entering the heating furnace; controlling the temperature of the preheating section and the temperature of the first heating section in the heating furnace; controlling the entrance temperature of the finish rolling , finishing rolling temperature. The invention reduces the thermal stress at the corners during heating and prevents internal cracks by controlling the temperature of the corners of the slab entering the furnace and the temperature of the first heating, controls the temperature of the finishing rolling entrance and the finishing rolling of the tandem rolling unit, and reasonably sets the temperature between the stands. Tension, thereby preventing the occurrence of hot-rolled edge crack defects.

Description

Technical field [0001] The present invention is a field of preparation of silicon steel, and especially involves a method to prevent the hot -rolled edge of the silicon steel. Background technique [0002] Cold -rolled silicon steel, especially the manufacturing process of silicon steel, strict component control, extremely low component content, and many manufacturing processes and factors. Therefore, its product quality is often considered a sign of a national special steel manufacturing technology level.There is the name of "art products" in steel products.SI is one of the main alloy elements that obtain lower iron damage in the orientation of Silicon Steel. The SI content of Silicon Steel is generally controlled in the range of 2.8 to 3.3%.Due to the improvement of silicon content, the toughness of steel decreased sharply, and the thermal conductivity decreased.The toughness of Silicon Steel has a very close relationship with the temperature. As the temperature decreases, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/12C21D11/00B21B37/74
Inventor 王新江毛尽华韦弦郭世宝李长春张振申刘社牛刘海强徐党委何晓波王中岐李智慧
Owner ANYANG IRON & STEEL
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