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Hot rolling method for non-oriented electrical steel thin strip

A technology for grain-oriented electrical steel and electrical steel, which is applied in the field of hot rolling of non-oriented electrical steel strips, can solve the problems of difficulty in cold rolling and difficulty in cold rolling, and achieves reduction of iron loss of finished products, improvement of production efficiency, and excellent electromagnetic properties. Effect

Inactive Publication Date: 2016-07-20
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cold rolling is difficult when the silicon content reaches 2.0% or more, and it is difficult to achieve cold rolling when it reaches 3.20%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Raw material composition: C: 0.003%, Si: 3.7%, Al: 0.25%, Mn: 0.35%, P: 0.015%, S: 0.003%, N: 0.025%, the rest is Fe and unavoidable impurities.

[0016] 1. Continuous casting is used to cast molten steel into a 230mm thick billet;

[0017] 2. The steel billet is heated at 1150°C, held for 200 minutes, rolled out of the furnace to 30 mm, and the first piece is rolled into a hot coil box for heat preservation. The second billet is rolled to the same thickness, and the first billet is taken out from the hot coil box and stacked on the second billet, and then enters the finish rolling mill and rolled to 0.5mm, the starting rolling temperature is 940°C, the stand water is turned off, and the final rolling temperature is 810°C . After hot rolling, it is coiled and kept warm, and the coiling temperature is 680°C;

[0018] 3. Slowly cool to room temperature and then cut and roll;

[0019] Finished iron loss P1.5: 2.88W / kg, magnetic induction B5000: 1.70T.

Embodiment 2

[0021] Raw material composition: C: 0.003%, Si: 3.55%, Al: 0.35%, Mn: 0.25%, P: 0.018%, S: 0.003%, N: 0.025%, the rest is Fe and unavoidable impurities.

[0022] 1. Continuous casting is used to cast molten steel into a 230mm thick billet;

[0023] 2. The steel billet is heated at a temperature of 1050°C, and after being held for 200 minutes, it is rolled out of the furnace to 30mm, and the first piece is rolled into a hot coil box for heat preservation. The second billet is rolled to the same thickness, and the first billet is taken out from the hot coil box and stacked on the second billet, and then enters the finishing mill and rolled to 0.65mm, the starting rolling temperature is 940°C, the stand water is turned off, and the final rolling temperature is 800°C . After hot rolling, it is coiled and kept warm, and the coiling temperature is 690°C;

[0024] 3. Slowly cool to room temperature and then cut and roll;

[0025] Finished iron loss P1.5: 2.85W / kg, magnetic inducti...

Embodiment 3

[0027] Raw material composition: C: 0.003%, Si: 5.0%, Al: 0.85%, Mn: 0.55%, P: 0.010%, S: 0.003%, N: 0.022%, the rest is Fe and unavoidable impurities.

[0028] 1. Continuous casting is used to cast molten steel into a 230mm thick billet;

[0029] 2. The steel billet is heated at 1080°C, held for 220 minutes and rolled out to 30mm. Two hot coil boxes are installed in front of the finishing mill. With the same thickness, the first two billets are pulled out from the hot coil box and stacked on the third billet to enter the finish rolling to 0.5mm, the starting rolling temperature is 950°C, the stand water is turned off, and the final rolling temperature is 820°C. After hot rolling, it is coiled and kept warm, and the coiling temperature is 700°C;

[0030] 3. When the roll temperature drops to the room temperature, the edge is cut and divided into rolls;

[0031] Finished iron loss P1.5: 2.1W / kg, magnetic induction B5000: 1.68T.

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Abstract

The invention provides a hot rolling method for a non-oriented electrical steel thin strip. The electrical steel thin strip comprises, by weight, C<=0.003%, 3.5%-7.0% of Si, Al<=3.0%, 0.10%-1.50% of Mn, P<=0.03%, S<=0. 01%, N<=0.05%, and the balance Fe and unavoidable impurities. Before finish rolling, a plurality of slabs are stacked together to be rolled, the slabs are the same in thickness and component, and the thickness of each slab is 30-40 mm. The rolling starting temperature is controlled to be 950 DEG C or below. In the rolling process, cooling water in a rack is stopped. The final rolling temperature is controlled to be 800 DEG C or above. The coiling temperature is controlled to be 700 DEG C or below. Each roll of steel plate is rolled to be 0.2-0.7 mm. Slow cooling is conducted after coiling. After slow cooling, edge cutting and roll division are conducted. According to the hot rolling method, hot stacking continuous rolling is adopted, and the final rolling temperature is raised, so that a hot rolled plate is fully recrystallized, and the finished product iron loss is further reduced. The electromagnetic property is excellent, the production efficiency is improved, the steel plate is even in thickness, and the hot rolling method is suitable for high-speed stamping and automatic lamination.

Description

technical field [0001] The invention relates to a production method of electrical steel thin strip, in particular to a hot rolling method of non-oriented electrical steel thin strip. Background technique [0002] Non-oriented silicon steel is divided into two categories: hot-rolled silicon steel and cold-rolled silicon steel. Hot-rolled silicon steel is usually rolled back and forth in a single stand, and the finished product is a single sheet with a length of several meters, which cannot be applied to continuous production of high-speed punching machines. The production efficiency is low, the finished product rate is low, and the thickness of the finished product fluctuates greatly. [0003] More than 80% of non-oriented silicon steel adopts high-speed stamping and automatic lamination. Because the hot rolling roll is deformed by heat and the roll crown increases, the thinnest hot continuous rolling can only produce steel plates with a thickness of about 1.0mm. In order to...

Claims

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Application Information

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IPC IPC(8): C21D8/12C22C38/06C22C38/04
Inventor 高振宇张智义陈春梅金文旭胡洪旭李亚东李文权林棡张仁波刘文鹏马云龙
Owner ANGANG STEEL CO LTD
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