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A kind of heating method of cold-packed electrical steel

A heating method and technology of electrical steel, applied in the field of metallurgy, can solve problems such as failure to work for 24 hours, equipment damage, delay time, etc., and achieve the effects of improving production pass rate, reducing waste judgment, and reducing thermal stress

Active Publication Date: 2018-09-18
PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to various uncertain constraints, such as temporary maintenance of hot rolling, delay in scrap steel processing, or shutdown due to equipment damage, etc., it may not be possible to install the furnace within 24 hours

Method used

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  • A kind of heating method of cold-packed electrical steel
  • A kind of heating method of cold-packed electrical steel
  • A kind of heating method of cold-packed electrical steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In Xichang Steel Vanadium Hot Rolling Plant, an engineering test was carried out according to the composition design and process design of the invention, and the production grade was 50PRW1300 non-oriented electrical steel. The composition is as shown in Table 1:

[0039] Table 1 Chemical composition of 50PRW1300 non-oriented electrical steel (wt%)

[0040] Production grade

C

Si

mn

als

50PRW1300

0.0030

0.20

0.22

0.18

[0041] 1. Incoming steelmaking materials are stacked and slowly cooled. The specific method is: put 2 to 3 hot billets at the bottom, 2 to 3 hot billets at the top, and stack hot billets on both sides (the higher the temperature, the better).

[0042] 2. The heating process carried out according to the silicon content is shown in Table 2:

[0043] Table 2 Heating process of 50PRW1300 non-oriented electrical steel

[0044]

[0045] 3. In order to ensure the time of each section in the furnace and ensure ...

Embodiment 2

[0049] In Xichang Steel Vanadium Hot Rolling Plant, an engineering test was carried out according to the composition design and process design of the invention, and the production grade was 50PRW800 non-oriented electrical steel. The composition is as shown in Table 3:

[0050] Table 3 Chemical composition of 50PRW800 non-oriented electrical steel (wt%)

[0051] Production grade

C

Si

mn

als

50PRW800

0.0035

0.98

0.27

0.28

[0052] 1. Incoming steelmaking materials are stacked and slowly cooled. The specific method is: put 2 to 3 hot billets at the bottom, 2 to 3 hot billets at the top, and stack hot billets on both sides (the higher the temperature, the better).

[0053] 2. The heating process carried out according to the silicon content is shown in Table 4:

[0054] Table 4 Heating process of 50PRW800 non-oriented electrical steel

[0055]

[0056] 3. In order to ensure the time of each section in the furnace and to ensure s...

Embodiment 3

[0060] In Xichang Steel Vanadium Hot Rolling Plant, engineering tests were carried out according to the composition design and process design of the invention, and the production grade was 50PRW600 non-oriented electrical steel. The composition is as shown in Table 3:

[0061] Table 5 Chemical composition of 50PRW600 non-oriented electrical steel (wt%)

[0062] Production grade

C

Si

mn

als

50PRW600

0.0020

1.51

0.27

0.23

[0063] 1. The incoming steelmaking materials are stacked and slowly cooled. The specific method is: put 2 to 3 hot billets at the bottom, 2 to 3 hot billets at the top, and stack hot billets on both sides (the higher the temperature, the better);

[0064] 2. The heating process carried out according to the silicon content is shown in Table 6:

[0065] Table 6 Heating process of 50PRW600 non-oriented electrical steel

[0066]

[0067] 3. In order to ensure the time of each section in the furnace and to ensur...

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Abstract

The invention belongs to the technical field of metallurgy and particularly relates to a low-grade non-oriented electrical steel cold-charging furnace and a heating preparation method forelectrical steel. The heating method for the cold-charging electrical steel comprises the following steps of a, after making and casting steel into plate billets, and waiting to charge into the furnace by adopting a stacking mode; b, controlling heating temperatures and time at various stages; and c, controlling the tapping interval and the tapping temperature of the plate billets. According to the heating method disclosed by the invention, on the basis of the characteristics of an internal organizational structure of the cold-charging non-oriented electrical steel, a proper heating technique is formulated, the temperature at the earlier stage of temperature rise is reduced, the low-temperature heating time is prolonged, and the condition that the temperature difference between inside and outside of the cold-charging electrical steel is locatedwithin a controllable range is guaranteed; in addition, by adopting silicon contents as differentiating factors, different temperature rise speeds and time of various heating stages are formulated according to the difference of the silicon contents, the condition that the temperature raising speed is locatedwithin the controllable range is guaranteed, and the generation of stress is reduced; and meanwhile, high maneuverability is realized, and the rejection judgement of the non-oriented electrical steel caused by excessively-low temperature of casting blanks can be reduced.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a low-grade non-oriented electrical steel cold charging furnace and a heating preparation method thereof. Background technique [0002] As the country increases the development of the electric power industry, it greatly promotes the development of electrical steel rolling technology. However, based on the existing technology, the thermal conductivity and thermal expansion coefficient of electrical steel decrease due to the increase in the silicon content of non-oriented electrical steel. At the same time The as-cast grain size increases, and the increase in silicon content leads to an increase in the brittleness of the slab. Therefore, when the continuous casting slab is reheated below 300°C, it is very easy to produce internal crack defects, and the internal crack defects generated will produce holes and scars during finish rolling, resulting in finish rolling scr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/34C21D6/00C21D9/00C22C38/02C22C38/04C22C38/06
CPCC21D1/34C21D6/005C21D6/008C21D9/0081C22C38/004C22C38/02C22C38/04C22C38/06
Inventor 包薪群李卫平李正荣王羿王登刚刘勇
Owner PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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