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

Active Publication Date: 2014-01-01
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 techniques of oriented silicon steel, and particularly relates to a method for preventing hot rolling edge fractures in oriented silicon steel. The method comprises the step of temperature control in a heating furnace heating and rolling process, including temperature of the oriented silicon steel plate blank before the corner enters the heating furnace, preheating section temperature and first heating section temperature in the heating furnace, and precision rolling inlet temperature and precision rolling finishing temperature. By controlling the corner temperature of the plate blank entering the furnace and the first heating section temperature, the method reduces the thermal stress when heating the corner, and avoids generating internal fractures; and by controlling the precision rolling inlet and finishing temperatures of the continuous rolling mill train and reasonably setting the tension among the machine frames, the method avoids generating the hot rolling edge fractures.

Description

technical field [0001] 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. Background technique [0002] The manufacturing process of cold-rolled silicon steel, especially grain-oriented silicon steel, is complicated, the composition is strictly controlled, the content of inclusions is extremely low, the manufacturing process is long and there are many influencing factors, so its product quality is often regarded as a symbol of a country's special steel manufacturing technology level, It has the reputation of "art product" among steel products. Si is one of the main alloying elements for grain-oriented silicon steel to obtain lower iron loss, and the Si content of grain-oriented silicon steel is generally controlled within the range of 2.8-3.3%. Due to the increase in silicon content, the toughness of the steel decreases sharply, and ...

Claims

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Application Information

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Patent Type & Authority Applications(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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