阅读说明：本技术 一种薄规格取向硅钢的防粘结处理方法 (Anti-bonding treatment method for thin oriented silicon steel ) 是由 马长松 沈侃毅 李国保 杨勇杰 胡卓超 章华兵 侯长俊 刘德胜 赵自鹏 凌晨 于 2020-06-15 设计创作，主要内容包括：本发明公开了一种薄规格取向硅钢的防粘结处理方法,通过取向硅钢脱碳退火卷涂覆MgO后,将钢卷平放,使钢卷的两个端面垂直于地面,再使用MgO涂液涂覆钢卷两个端面,对两个端面利用红外加热或煤气加热进行烘烤后,利用翻钢机竖放钢卷、装高温炉,进行高温退火。通过本发明不需要单独准备特殊涂覆材料,利用现有机组MgO涂液即可实施,有效解决钢卷上下端面粘结,成品钢卷边部底层质量良好。(The invention discloses an anti-bonding treatment method of thin-specification oriented silicon steel, which comprises the steps of coating MgO on an oriented silicon steel decarburization annealing coil, horizontally placing a steel coil to enable two end surfaces of the steel coil to be vertical to the ground, coating MgO coating liquid on the two end surfaces of the steel coil, baking the two end surfaces by infrared heating or coal gas heating, vertically placing the steel coil by a steel tilting machine, loading the steel coil in a high-temperature furnace, and carrying out high-temperature annealing. The method can be implemented by using the MgO coating liquid of the existing unit without independently preparing special coating materials, effectively solves the problem of bonding of the upper end surface and the lower end surface of the steel coil, and has good quality of the bottom layer at the edge part of the finished steel coil.)

1. An anti-bonding treatment method for thin oriented silicon steel is characterized by comprising the following steps:

s1, coating MgO on the oriented silicon steel decarburization annealing coil, and enabling two end faces of the steel coil to be perpendicular to the ground;

s2, coating MgO coating liquid on the surfaces of the two end surfaces of the steel coil, and then carrying out heat treatment;

and S3, vertically placing the steel coil after heat treatment, and then carrying out high-temperature annealing.

2. The method for preventing sticking of thin gauge oriented silicon steel as claimed in claim 1, wherein the thickness of the coil of oriented silicon steel is 0.10-0.23 mm.

3. The method for anti-sticking treatment of thin gauge oriented silicon steel as claimed in claim 1, wherein the MgO coating solution is prepared by mixing MgO: 1 (1-15) of water, MgO: TiO2₂1 (2% -10%) in proportion.

4. As in claimThe anti-bonding treatment method for the thin-gauge oriented silicon steel of claim 1, characterized in that the coating amount of the MgO coating liquid on each end surface is 5-20 g/m²。

5. The method for anti-sticking treatment of thin gauge oriented silicon steel as claimed in claim 4, wherein the coating amount of the MgO coating liquid on each end surface is 7-12 g/m²。

6. The method for anti-sticking treatment of thin gauge oriented silicon steel as claimed in claim 1, wherein the heat treatment temperature is 100 to 200 ℃.

7. The method for anti-sticking treatment of thin gauge oriented silicon steel as claimed in claim 1 or 6, wherein the heat treatment is baking by infrared heating or gas heating.

8. The method for anti-sticking treatment of thin gauge oriented silicon steel as claimed in claim 1, wherein the temperature of the high temperature annealing is 1150-1250 ℃.

Technical Field

The invention relates to a method for manufacturing oriented silicon steel, in particular to an anti-bonding treatment method for thin oriented silicon steel.

Background

In recent years, in order to reduce the loss of power transmission and distribution transformers and reduce carbon dioxide emission, mandatory high-energy-efficiency power distribution transformer standards are published in main countries in the world, for example, new standards of GB20052-2013 'energy efficiency limit value and energy efficiency grade' of three-phase power distribution transformers are published in 2013 in China. The improvement of the energy efficiency grade of the transformer inevitably requires the improvement of the original material performance of the transformer iron core, namely requires the reduction of the iron loss of the oriented silicon steel, wherein the most effective method is to reduce the thickness.

Due to the reduction of the thickness, the production difficulty of field production is greatly increased. Particularly, after the steel coil is subjected to high-temperature annealing, end face adhesion often occurs, so that the strip is broken in the subsequent procedure, and the operating rate is reduced. The patent (application number 201420833360.5) provides a device for preventing bonding in steel coil annealing, and MgO powder is spread and brushed on the upper end face, so that the problem of bonding of the steel coil on the upper end face is effectively solved, but the bonding of the lower end face is not completely solved. The patent discloses a bottom separant (application number: 201910549812.4) and a separant (application number: 201910549817.7) for reducing the bonding defect of the edge of the oriented silicon steel coil during high-temperature annealing, which respectively provide the separant for preventing bonding, the formula of the separant is inconsistent with the components of the existing MgO coating liquid, and the separant needs to be prepared and added with materials separately, so that the separant is not beneficial to the production organization on site.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides an anti-bonding treatment method of thin oriented silicon steel, which can effectively solve the problem of bonding of the upper end surface and the lower end surface of a steel coil.

The invention is realized by the following technical scheme:

the invention provides an anti-bonding treatment method of thin oriented silicon steel, which comprises the following steps:

s1, coating MgO on the oriented silicon steel decarburization annealing coil, and enabling two end faces of the steel coil to be perpendicular to the ground;

s2, coating MgO coating liquid on the surfaces of the two end surfaces of the steel coil, and then carrying out heat treatment;

and S3, vertically placing the steel coil after heat treatment, and then carrying out high-temperature annealing.

Preferably, the thickness of the oriented silicon steel coil is 0.10-0.23 mm.

Preferably, the MgO coating liquid is prepared from the following components: 1 (1-15) of water, MgO: TiO2₂1 (2% -10%) in proportion.

Preferably, the coating amount of the MgO coating liquid on each end surface is 5-20 g/m²。

Preferably, the coating amount of the MgO coating liquid on each end surface is 7-12 g/m²。

Preferably, the heat treatment temperature is 100-200 ℃.

Preferably, the heat treatment method is baking by infrared heating or coal gas heating.

Preferably, the temperature of the high-temperature annealing is 1150-1250 ℃.

The method is particularly suitable for solving the problem of end face bonding of thin silicon steel products, mainly products with the diameter of 0.23mm or less, and can be conveniently implemented by brushing MgO on the end face and adopting MgO coating liquid which is the same as or similar to a machine set. The coating amount of the end face is less than 5g/m²The anti-sticking effect is not achieved, and the content of the anti-sticking agent exceeds 20g/m²Excessive coating amount causes material waste, and the preferable coating amount is 7-12 g/m². The end face is baked to prevent bottom layer defects of watermarks and the like from occurring after high-temperature annealing of the steel coil, the baking effect cannot be achieved when the baking temperature is lower than 100 ℃, and heat waste can be caused when the baking temperature exceeds 200 ℃.

Compared with the prior art, the invention has the advantages that the MgO coating liquid of the existing unit can be implemented without independently preparing special materials; the problem of bonding of the upper end surface and the lower end surface of the steel coil is effectively solved; the bottom layer of the edge part of the finished steel coil is good in quality.

Drawings

FIG. 1 is a process flow diagram of the method of the present invention.

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.

The invention is further illustrated with reference to the following figures and examples.

Example 1

Cold rolling the oriented silicon steel coil which is subjected to conventional steelmaking, hot rolling and normalization to 0.15mm, then carrying out decarburization annealing, and coating MgO according to the attached drawing 1 to ensure that two end faces of the steel coil are vertical to the ground; coating MgO on two end faces of the steel coil (the used MgO coating liquid is obtained from an on-site coating machine and is prepared from MgO, water and TiO2 in a ratio of 1: 12: 8, namely MgO, water and MgO, TiO2 in a ratio of 1: 8), and specifically comprises the steps of uniformly mixing MgO and water in a ratio of 1: 12, adding TiO2 with the mass of 8% of MgO into the mixed liquid, and fully mixing uniformly, wherein the coating amount of each end face is 9g/m2, and then baking the two end faces coated with the MgO by adopting infrared heating or coal gas heating, and the baking temperature of the end faces is 120 ℃ during heat treatment; vertically placing the heat-treated steel coil by using a tilting gear, then loading the steel coil into a high-temperature furnace, and carrying out high-temperature annealing at 1150 ℃ and hot stretching and leveling annealing; the bonding incidence rate of the steel coil processed by the steps is 0%, and the defect rate of the bottom layer of the edge part is 0%, so that the processed steel coil in the embodiment has no bonding on the edge part and has a poor bottom layer.

Example 2

Cold rolling to 0.18mm by using a conventional steelmaking, hot rolling and normalizing oriented silicon steel coil, and then carrying out decarburization annealing according to the attached drawing1, after MgO is coated, two end faces of a steel coil are perpendicular to the ground; coating MgO on two end faces of the steel coil (the used MgO coating liquid is obtained from an on-site coating machine and is prepared from MgO, water and TiO2 in a ratio of 1: 12: 10%, namely MgO, water, 1: 12 and MgO, TiO2, in a ratio of 1: 10), specifically, uniformly mixing MgO and water in a ratio of 1: 12, adding TiO2 with the mass of 10% of the MgO into the mixed liquid, and fully mixing the mixture), wherein the coating amount of each end face is 10g/m²Then, baking the two end faces coated with the MgO by adopting infrared heat or coal gas heating, wherein the baking temperature of the end faces is 140 ℃ during heat treatment; then vertically placing the heat-treated steel coil by using a tilting gear, putting the steel coil into a high-temperature furnace, and carrying out high-temperature annealing at the annealing temperature of 1200 ℃ and hot stretching and flattening annealing; the bonding incidence rate of the steel coil processed by the steps is 0%, and the defect rate of the bottom layer of the edge part is 0%, so that the processed steel coil in the embodiment has no bonding on the edge part and has a poor bottom layer.

Example 3

Cold rolling the oriented silicon steel coil which is subjected to conventional steelmaking, hot rolling and normalization to 0.20mm, then carrying out decarburization annealing, and coating MgO according to the attached drawing 1 to ensure that two end faces of the steel coil are vertical to the ground; coating MgO on two end faces of the steel coil (the used MgO coating liquid is obtained from an on-site coating machine and is prepared from MgO, water and TiO2 in a ratio of 1: 6: 4, namely MgO, water and MgO, TiO2 in a ratio of 1: 4), and specifically comprises the steps of uniformly mixing MgO and water in a ratio of 1: 6, adding TiO2 with the mass of 4% of MgO into the mixed liquid, and fully mixing uniformly, wherein the coating amount of each end face is 11g/m2, and then heating the two end faces coated with the MgO by adopting infrared heat or coal gas for baking, wherein the baking temperature of the end faces is 160 ℃ during heat treatment; vertically placing the heat-treated steel coil by using a tilting gear, putting the steel coil into a high-temperature furnace, and performing high-temperature annealing at 1250 ℃ and hot stretching and leveling annealing; the bonding incidence rate of the steel coil processed by the steps is 0%, and the defect rate of the bottom layer of the edge part is 0%, so that the processed steel coil in the embodiment has no bonding on the edge part and has a poor bottom layer.

Example 4

Cold rolling the oriented silicon steel coil which is subjected to conventional steelmaking, hot rolling and normalization to 0.23mm, then carrying out decarburization annealing, and coating MgO according to the attached drawing 1 to ensure that two end faces of the steel coil are vertical to the ground; coating MgO on two end faces of the steel coil (the used MgO coating liquid is obtained from an on-site coating machine and is prepared from MgO, water and TiO2 in a ratio of 1: 1: 2, namely MgO, water and MgO, water are 1: 1, and MgO, TiO2 is 1: 2), and the method specifically comprises the steps of uniformly mixing MgO and water in a ratio of 1: 1, adding TiO2 with the mass of 2% of MgO into the mixed liquid, and fully mixing uniformly, wherein the coating amount of each end face is 16g/m2, and then baking the two end faces coated with the MgO by adopting infrared heating or coal gas heating, wherein the baking temperature of the end faces is 130 ℃ during heat treatment; then vertically placing the heat-treated steel coil by using a tilting gear, putting the steel coil into a high-temperature furnace, and carrying out high-temperature annealing at the annealing temperature of 1200 ℃ and hot stretching and flattening annealing; the bonding incidence rate of the steel coil processed by the steps is 0%, and the defect rate of the bottom layer of the edge part is 0%, so that the processed steel coil in the embodiment has no bonding on the edge part and has a poor bottom layer.

Comparative example

Cold rolling the oriented silicon steel coil subjected to conventional steelmaking, hot rolling and normalizing to 0.15mm, 0.18mm, 0.20mm and 0.23mm, then performing decarburization annealing, and coating MgO according to the attached drawing 1 to ensure that two end surfaces of the steel coil are vertical to the ground; coating MgO on two end faces of the steel coil (the used MgO coating liquid is obtained from an on-site coating machine, and the ratio of MgO to water is 1: 12: 8%, namely the ratio of MgO to water is 1: 12, and the ratio of MgO to TiO2 is 1: 8), specifically, the MgO and the water are mixed uniformly according to the ratio of 1: 12, TiO2 with the mass of 8% of the MgO is added into the mixed liquid, and the mixture is fully mixed), and compared with the condition that the MgO is not coated, vertically placing the steel coil after heat treatment by using a steel turnover machine, then putting the steel coil into a high-temperature furnace, and carrying out high-temperature annealing at the annealing temperature of 1200 ℃ and hot stretching and leveling annealing; the details of the implementation of the comparative example are shown in Table 1, wherein in comparative example 1, the coating amount per one end face is 3g/m²Then, the MgO-coated two end faces are baked by infrared heating or gas heating, the baking temperature of the end faces is 150 ℃ during heat treatment, mainly the coating amount of the end faces is too low to be effectiveAdhesion was prevented, and the coating amount per one end face in comparative example 2 was 15g/m²And then, the two end faces coated with the MgO are roasted by adopting infrared heating or coal gas heating, the roasting temperature of the end faces is 80 ℃ during heat treatment, the defect of poor bottom layers such as watermarks is mainly caused by low roasting temperature of the end faces, and the bonding incidence rate is higher mainly caused by no coating of the end faces in comparative examples 3-6.

TABLE 1 treatment method and comparison of effects of comparative examples in the invention

In summary, the present invention is only a preferred embodiment, and not intended to limit the scope of the invention, and all equivalent changes and modifications in the shape, structure, characteristics and spirit of the present invention described in the claims should be included in the scope of the present invention.