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Electric steel plate capable of relieving stress annealing and having high performance of solvent-resisting

A technology of stress relief annealing and solvent resistance, applied in the directions of inorganic material magnetism, thin material handling, transportation and packaging, etc., can solve the problems of weak adhesion, poor punching, weak coating, etc., to achieve stress relief annealing, Excellent solvent resistance effect

Inactive Publication Date: 2006-01-18
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] Inorganic colloidal silica, as seen in the prior art, is excellent in heat resistance and is an extremely effective substance for preventing the burning of steel plates. However, silica alone has weak adhesion to steel plates, poor lubricity, and shock Disadvantages of poor tailorability, weak coating, and easy rust

Method used

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  • Electric steel plate capable of relieving stress annealing and having high performance of solvent-resisting
  • Electric steel plate capable of relieving stress annealing and having high performance of solvent-resisting
  • Electric steel plate capable of relieving stress annealing and having high performance of solvent-resisting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0099] On the surface of an electrical steel sheet with a thickness of 0.5 mm, apply a coating solution containing resin, silica, and alkali metals, with a part of Cl and S below the specified amount, by roll coating, and bake the sheet at a temperature of 150°C Let it cool, form the insulating coating shown in Table 1, and manufacture an electrical steel sheet with the insulating coating.

[0100] The obtained electrical steel sheet with an insulating coating was evaluated or measured for solvent resistance, punchability, corrosion resistance before and after stress relief annealing, adhesion, and seizure resistance by the following methods. The evaluation results of solvent resistance, product plate and annealed plate corrosion resistance are shown in Table 1, and further, the effect of silica weight on punchability, the effect of silica weight on seizure resistance, and the effect of coating amount on The influence of the coating adhesion of the product plate and the anneal...

Embodiment 2

[0139] The coatings described in Table 2 were formed on the surface of an electrical steel sheet having a thickness of 0.5 mm. Coating was performed using a roll coater, and after reaching a plate temperature of 150° C., baking and cooling were performed, and then subjected to various performance tests. Solvent resistance, punchability, adhesion (product board, annealed board), and seizure resistance were measured and evaluated in the same manner as in Example 1.

[0140] Membrane-forming

[0141] The coating appearance after baking at a plate temperature of 150° C. was visually observed and evaluated in accordance with the following criteria.

[0142] ◎: Shows a uniform appearance, no cracks and bubbles, no stickiness

[0143] ○: There are some cracks and bubbles

[0144] △: Many cracks and bubbles, some stickiness

[0145] ×: There are many cracks and air bubbles, and it is remarkably sticky

[0146] As is clear from Table 2, the examples of the present invention are al...

Embodiment 3

[0148] The coatings described in Table 3 were formed on the surface of an electrical steel sheet having a thickness of 0.5 mm. Coating was performed using a roll coater, and after reaching a plate temperature of 150° C., baking was performed and left to cool, each performance test was performed. In the same manner as in Examples 1 and 2, film forming properties, solvent resistance, punchability, adhesion (product sheet, annealed sheet), and seizure resistance were measured and evaluated.

[0149] It can be clearly seen from Table 3 that the examples of the present invention are all electrical steel sheets with insulating coatings excellent in solvent resistance, punchability, corrosion resistance before and after stress relief annealing, adhesion, and seizure resistance. In addition, the examples in the table are based on the improvement of only the focused performance, but they are also examples of further improvement of other various performances. Regarding other performance...

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Abstract

An electrical steel sheet with coated insulating layer features excellent solvent resistance and no need of stress annealing. Said coated insulating layer contains resin, SiO2, and alumina or inorganic colloid that is SiO2 containing alumina. Said electrical steel sheet is made up through preparing the coating liquid with water, coating it on the surfaces of steel plate, and baking at 50-250 deg.C.

Description

technical field [0001] The present invention relates to an electrical steel sheet with an insulating coating, especially an electrical steel sheet with an insulating coating that does not contain harmful compounds such as hexavalent chromium, can be manufactured by low-temperature baking, and can be annealed for stress relief and has excellent solvent resistance . Background technique [0002] Insulating coatings of electrical steel sheets used as raw materials for motors and transformers require various properties not only from the interlayer resistance but also from the viewpoints of convenience during processing, storage, and usage. Various properties required include punchability, TIG weldability, coating adhesion, corrosion resistance, solvent resistance, heat resistance, blocking resistance, seizure resistance, and stress relief annealing. Corrosion resistance and burning resistance, etc. In order to improve the magnetic properties after punching, electrical steel sh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D5/25C21D8/12H01F1/18
CPCY10T428/31529H01F1/18Y10T428/273Y10T428/31678Y10T428/31681C21D8/1283Y10T428/31688Y10T428/31692Y10T428/12611C21D8/1244Y10T428/31605
Inventor 小森优佳山口胜郎佐藤圭司
Owner JFE STEEL CORP
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