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Preparation technology of non-oriented high grade silicon steel

A high-grade, silicon steel technology, applied in metal rolling, manufacturing tools, temperature control, etc., to achieve the effects of eliminating edge cracks, improving production efficiency, and increasing uncoiling temperature

Inactive Publication Date: 2010-06-23
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the current non-oriented high-grade silicon steel hot-rolled sheet has many edge cracks, it cannot be rolled by pickling and cold tandem rolling mills.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Smelting and continuous casting process:

[0028] The chemical composition wt% of steel after smelting is:

[0029] C 0.002, Si 2.7, Mn 0.2, P 0.010, S 0.002, Als 0.623, N 0.0011, O is 0.

[0030] After the smelting is completed, the continuous casting slab with a size of 230×1060×7500 mm is made by continuous casting.

[0031] 2. Hot rolling process:

[0032] According to the hot rolling temperature: the heating temperature is 1160°C, the final rolling temperature is 790°C, and the coiling temperature is 680°C, the continuous casting slab is hot rolled into a hot rolled coil with a thickness of 2.3mm.

[0033] 3. Cold rolling process:

[0034] A five-stand pickling-cold tandem rolling unit is used. The uncoiling temperature is 50°C, normal pickling and trimming. The distribution of reduction rate of rolling mills 1 to 5 is:

[0035] The reduction rate of 1 frame is 25.66%, the reduction rate of 2 frames is 24.17%, the reduction rate of 3 frames is 14.87%, the ...

Embodiment 2

[0043] 1. Smelting and continuous casting process:

[0044] The chemical composition wt% of steel after smelting is:

[0045] C 0.003, Si 2.9, Mn 0.12, P 0.009, S 0.004, Als 0.615, N 0.002, O is 0.

[0046] After the smelting is completed, the continuous casting slab with a size of 230×1060×7500 mm is made by continuous casting.

[0047] 2. Hot rolling process:

[0048] According to the hot rolling temperature: the heating temperature is 1140°C, the final rolling temperature is 820°C, and the coiling temperature is 710°C, the continuous casting slab is hot rolled into a hot rolled coil with a thickness of 2.3mm.

[0049] 3. Cold rolling process:

[0050] A five-stand pickling-cold tandem rolling unit is used. The uncoiling temperature is 90°C, normal pickling and trimming. The distribution of reduction rate of rolling mills 1 to 5 is:

[0051] The reduction rate of 1 frame is 26.17%, the reduction rate of 2 frames is 26.07%, the reduction rate of 3 frames is 20.63%, the ...

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Abstract

The invention relates to a preparation technology of non-oriented high grade silicon steel, in which a hot rolled steel coil without edge crack in full length is obtained via controlling the smelting ingredients and the hot rolling process of the steel; the cold-rolling uncoiling temperature is increased to keep the temperature of strip steel always above the brittle transition point thereof; and the acid washing--5 stand cold continuous rolling process is adopted to reasonably distribute the reduction rate of each cold rolling pass, and processing heat generated when the strip steel is rolled is utilized to realize the cold continuous rolling of the non-oriented high grade silicon steel. Compared with the conventional 5-pass rolling process of a single-stand reversing mill, the production efficiency of the cold rolling process is increased by nearly 20 times, the investment of equipment, personnel and raw materials is greatly reduced, the production cost is greatly reduced, the phenomenon of edge crack of a hot rolled plate is eliminated, and the surface quality and the product yield of the hot rolled plate are increased.

Description

technical field [0001] The invention belongs to the field of preparation technology of metallurgical products, and in particular relates to a production and preparation technology of cold continuous rolling non-oriented high-grade silicon steel. Background technique [0002] The production process of non-oriented high-grade silicon steel is complicated, and the production efficiency is low. Moreover, due to the high silicon content, edge cracks often appear in the strip steel after hot rolling, and the steel plate with edge cracks is very prone to strip breakage during cold rolling. [0003] At present, the cold rolling process of non-oriented high-grade silicon steel is usually rolled on a single-stand reversing rolling mill. Due to the relatively slow rolling speed, it is easy to aggravate the edge cracking of the hot-rolled steel plate. And once the edge crack occurs, in order to prevent the strip from breaking, the rolling mill must be stopped between rolling passes to c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P17/00C22C38/06B21B1/22B21B37/74B21B37/00
Inventor 李元华罗理金泰东高振宇王晓峰
Owner ANGANG STEEL CO LTD
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