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Process for preventing hot-rolling edge cracking of oriented silicon steel

A technology for oriented silicon steel and edge cracking, which is applied in the field of preventing edge cracking during hot rolling of oriented silicon steel, and can solve problems such as the occurrence of edge cracking in oriented silicon steel.

Active Publication Date: 2018-06-22
新余钢铁股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Several tests were carried out according to this method, and the results showed that edge cracks of grain-oriented silicon steel occurred from time to time, and there were deficiencies

Method used

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  • Process for preventing hot-rolling edge cracking of oriented silicon steel

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Comparison scheme
Effect test

Embodiment 1

[0073] The present embodiment is produced on a 1580mm hot continuous rolling line, and the heating furnace is two walking heating furnaces, which alternately tap steel. The production process steps are as follows:

[0074] Step 1: Steelmaking and continuous casting to obtain a grain-oriented silicon steel slab with a thickness of 230mm and a width of 1310mm. Al: 0.022%, N: 0.0092%, and the remaining elements are Fe and unavoidable residual elements in steel;

[0075] Step 2: The slab continuous casting ends at 8:31 minutes, the intermediate residence time is 9 hours and 58 minutes, the heating furnace starts at 18:29 minutes, and the surface temperature of the slab is measured at 302°C when entering the furnace;

[0076] Step 3: From the first slab into the furnace, the hot rolling tapping rhythm is 250 seconds to tap a piece of steel, and the two furnaces tap alternately;

[0077] Step 4: After the slab enters the first heating section, control the temperature of the furnace...

Embodiment 2

[0089] The present embodiment is produced on a 1580mm hot continuous rolling line, and the heating furnace is two walking heating furnaces, which alternately tap steel. The production process steps are as follows:

[0090] Step 1: steelmaking and continuous casting to obtain a grain-oriented silicon steel slab with a thickness of 230mm and a width of 1060mm. Al: 0.021%, N: 0.0098%, and the remaining elements are Fe and unavoidable residual elements in steel;

[0091] Step 2: The slab continuous casting ends at 11:25 minutes, the intermediate residence time is 5 hours and 20 minutes, the heating furnace starts at 16:45 minutes, and the surface temperature of the slab is measured at 526°C when entering the furnace;

[0092] Step 3: From the first slab into the furnace, the hot rolling tapping rhythm is 210 seconds to tap a piece of steel, and the two furnaces tap alternately;

[0093] Step 4: After the slab enters the first heating section, control the temperature of the furnac...

Embodiment 3

[0105] The present embodiment is produced on a 1580mm hot continuous rolling line, and the heating furnace is two walking heating furnaces, which alternately tap steel. The production process steps are as follows:

[0106] Step 1: Steelmaking and continuous casting to obtain a grain-oriented silicon steel slab with a thickness of 230 mm and a width of 1310 mm. Al: 0.023%, N: 0.0068%, and the remaining elements are Fe and unavoidable residual elements in steel;

[0107] Step 2: The slab continuous casting ends at 20:55 minutes, the intermediate residence time is 3 hours and 01 minutes, the heating furnace starts at 23:56 minutes, and the surface temperature of the slab is measured at 715°C when entering the furnace;

[0108] Step 3: From the first slab into the furnace, the hot rolling tapping rhythm is 180 seconds to tap a piece of steel, and the two furnaces tap alternately;

[0109] Step 4: After the slab enters the first heating section, control the temperature of the furn...

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Abstract

The invention discloses a process for preventing hot-rolling edge cracking of oriented silicon steel. The process comprises the steps that the surface temperature of a plate blank is no smaller than 300 DEG C before the plate blank enters a heating furnace; the furnace gas temperature of a first heating section is 1160-1250 DEG C; the furnace gas temperatures of a second heating section and a soaking section are each 1270-1330 DEG C, the heating time is 80-200 minutes, and the standing time is no longer than 30 minutes; the average grain size of the edge of a hot-rolled finished product is nolarger than 72 [mu]m; the final rolling temperature of finish rolling is 880-960 DEG C; the coiling temperature is 500-620 DEG C; and tension of a seven-rack finish rolling unit is reasonably controlled. On the premises that sufficient solid solubility of an oriented silicon steel inhibitor is ensured and electromagnetic performance of the finished product meets the target requirement, the problems that the edge of the plate blank is decarburized or the plate blank is locally decarburized when the heating time of the second heating section and the soaking section is too long or when the standing time is too long, grains grow excessively, and edge cracking occurs in the hot-rolling process are avoided.

Description

technical field [0001] The invention relates to the technical field of hot continuous rolling of oriented silicon steel, in particular to a process for preventing edge cracking in hot rolling of oriented silicon steel. Background technique [0002] Oriented silicon steel is known as the "work of art" in steel products. Its manufacturing process needs to go through steelmaking, hot rolling, primary cold rolling, decarburization annealing, secondary cold rolling, high temperature annealing and other processes. The process is complex, the process is long, and the composition The control is strict, and the content of inclusions is extremely low, and there are many factors that affect product quality and yield. Since the silicon content of oriented silicon steel is as high as 2.80% to 3.5%, it has the characteristics of low high temperature strength, high low temperature strength, low thermal conductivity, and brittle performance. Coarse problems such as micro-cracks. During th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/12C21D11/00B21B37/74B21B37/48
CPCB21B37/48B21B37/74C21D8/1222C21D11/00
Inventor 冷烨旻冷光荣唐小勇徐细华管兴伟裴伟马兵兵余小琴金大华王婷华王华杨帆
Owner 新余钢铁股份有限公司
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