A method for controlling the cold rolling of high-silicon thin strip non-oriented silicon steel

A technology of oriented silicon steel and control method, applied in the direction of metal rolling, temperature control, etc., can solve the problems of affecting the service life of rolls, difficulty in large-scale production, increasing costs, etc., and achieve the goal of reducing production costs and reducing the rate of cold rolling strip breakage Effect

Active Publication Date: 2021-02-23
ANGANG STEEL CO LTD
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  • Application Information

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Problems solved by technology

The method is technically advanced but difficult to implement in large-scale production
[0005] WISCO disclosed "A Method for Controlling Edge Cracks in Cold Rolling after Normalization of High Magnetic Sensitivity Oriented Silicon Steel" (Patent No. CN201410644651.4), which mainly controls the nozzles of normalization to achieve cross cooling, and no spraying within 30mm of the edge of the strip Water cooling, this method can improve the brittle fracture of the edge after normalized quenching, but the temperature of the edge of the roll in contact with the strip during long-term continuous production is too high, which will inevitably affect the service life of the roll and increase the cost

Method used

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  • A method for controlling the cold rolling of high-silicon thin strip non-oriented silicon steel
  • A method for controlling the cold rolling of high-silicon thin strip non-oriented silicon steel
  • A method for controlling the cold rolling of high-silicon thin strip non-oriented silicon steel

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Experimental program
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Effect test

Embodiment 1

[0049] In this embodiment, the thickness of the non-oriented silicon steel with high silicon strip produced is 0.35mm, and its chemical composition is calculated by weight percentage: C: 0.0025%, Si: 3.21%, Mn: 0.45%, P: 0.009%, S : 0.0021%, Als: 0.80%, N: 0.0020%; the rest is iron and unavoidable impurity elements.

[0050] The main control process parameters in the cold rolling process:

[0051] 1. The reduction rate of the first rolling pass is 41%, and the thickness step control rolling is implemented when the strip is 30 meters away from the tail. The thickness change is 1.06 times the minimum rolling thickness / m, and the thickness gradually increases to hot rolling. Plate thickness; at the same time, the emulsion flow rate on the inlet side in the rolling direction is 1600L / min, and the emulsion on the outlet side is closed.

[0052] 2. Put the friction roller into the belt during the second pass, the room temperature is 15°C, the normal pressure is 4KN, and the relativ...

Embodiment 2

[0055] In this example, the thickness of the high-silicon strip non-oriented silicon steel produced is 0.27 mm, and its chemical composition is: C: 0.0022%, Si: 3.05%, Mn: 0.50%, P: 0.010%, S: 0.0020%, Als : 1.06%, N: 0.0022%; the rest is iron and unavoidable impurity elements.

[0056] The main control process parameters in the cold rolling process:

[0057]1. The reduction rate of the first pass is 43%, and the thickness step control rolling is implemented when the strip is 32 meters away from the tail. The thickness change is 1.07 times the minimum rolling thickness / m, and the thickness gradually increases to the thickness of the hot-rolled plate; At the same time, the emulsion flow rate on the inlet side in the rolling direction is 1800L / min, and the emulsion on the outlet side is closed;

[0058] 2. The friction roller is put into the second belt threading, the room temperature is 10°C, the normal pressure is 3.5KN, and the relative sliding speed is 300m / s. At this time,...

Embodiment 3

[0061] In this example, the thickness of the high-silicon strip non-oriented silicon steel produced is 0.30 mm, and its chemical composition is: C: 0.0027%, Si: 3.25%, Mn: 0.55%, P: 0.008%, S: 0.0024%, Als : 0.85%, N: 0.0030%; the rest is iron and unavoidable impurity elements.

[0062] The main control process parameters in the cold rolling process:

[0063] 1. The reduction rate of the first pass is 42%, and the thickness step control rolling is implemented when the strip is 38 meters away from the tail. The thickness change is 1.08 times the minimum rolling thickness / m, and the thickness gradually increases to the thickness of the hot-rolled plate; At the same time, the emulsion flow rate at the inlet side of the rolling direction is 2000L / min, and the emulsion at the outlet side is closed;

[0064] 2. Put the friction roller into the belt during the second pass, the room temperature is 12°C, the normal pressure is 4.5KN, and the relative sliding speed is 260m / s. Effectiv...

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Abstract

The invention relates to a method for controlling the cold rolling of high-silicon thin strip non-oriented silicon steel. In the cold-rolled non-oriented silicon steel, by weight percentage: Si≥3.0%, Al≥0.8%, finished product thickness≤0.35mm; During the pass rolling, thickness transition rolling is adopted within 30-50m from the tail of the strip, and at least 2 pairs of friction rollers are installed in front of the rolling mill on the strip-threading side of the second pass of cold rolling to frictionally heat the edge of the strip. . In the present invention, a friction roller is added after the cold rolling uncoiling equipment of the single-stand reversible rolling mill, and it is put into use when the strip is threaded and started in the second pass of cold rolling, and it is stopped when the thickness of the strip steel transitions to the normal control range, and at the same time, it is controlled by the cold rolling process , so that the edge of the strip is heated more evenly, reducing the difficulty of production and reducing the rate of brittle fracture.

Description

technical field [0001] The invention relates to the technical field of non-oriented silicon steel production, in particular to a method for controlling the cold rolling of high-silicon thin non-oriented silicon steel. Background technique [0002] High-grade non-oriented silicon steel products are widely used in the manufacture of high-end, precision, and sharp-point motors and iron cores for instruments and meters. They are important metal functional soft magnetic materials. With the increase of silicon content, its brittleness becomes larger and the rate of strip breakage increases, especially for high-silicon thin strip products with a silicon content exceeding 3.0%. During the cold rolling process, the brittleness of the material itself and the edge of the incoming strip Defects or edge cracking problems, especially the frequent belt breaks during the second belt threading and starting process. Although the high-silicon thin strip products are heated in a water bath as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/22B21B37/74B21B3/00C22C38/02C22C38/06C22C38/04
CPCB21B1/22B21B3/00B21B37/74B21B2001/221B21B2001/225C22C38/001C22C38/02C22C38/04C22C38/06
Inventor 陈春梅高振宇李亚东张智义刘文鹏赵健宋清阳贾增本张仁波李文权
Owner ANGANG STEEL CO LTD
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