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Method for assessing thermotolerance of cold rolling silicon steel insulation coating

An insulating coating, cold-rolled silicon steel technology, applied in strength characteristics, measuring devices, instruments, etc., can solve the problems of lack of guidance, untimely feedback, etc., and achieve strong guidance and operability, convenient and quick evaluation standards. Effect

Active Publication Date: 2010-06-16
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The object of the present invention is to provide a kind of evaluation method of the heat resistance of the insulation coating of cold-rolled silicon steel, judge the heat resistance of the insulation coating of silicon steel plate according to the data that the sample detects before and after annealing, solve the feedback that exists in the existing evaluation method Untimely and lack of guidance issues provide a convenient and quick evaluation standard for the development and production adjustment of insulating coating varieties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 1. Sampling: The steel plate sample size is 300×100mm;

[0015] 2. Detect the interlayer resistance and adhesion of the steel plate sample before annealing, among which:

[0016] Interlayer resistance (according to the International Electrotechnical Commission IEC testing standard) 381Ωmm 2 / piece;

[0017] Adhesion level O;

[0018] 3. Heat-resistant annealing process of steel plate samples

[0019] Equipment model: hydrogen (nitrogen) protection electric furnace;

[0020] Annealing method: 100% nitrogen; Atmosphere control method: flow meter control;

[0021] Annealing temperature and time: 760±5℃×2h;

[0022] Cooling method: natural cooling with water jacket, cooling to 50 ° C and stopping gas;

[0023] Ventilation starts at 120°C, and it is allowed to push to the cooling section at 450°C, but water cooling is strictly prohibited;

[0024] In the whole process of the experiment, the gas must not be stopped, and the gas is operated. When the sample is pushed to...

Embodiment 2

[0033] 1. Sampling: The steel plate sample size is 300×100mm;

[0034] 2. Detect the interlayer resistance and adhesion of the steel plate sample before annealing, among which:

[0035] Interlayer resistance (according to the International Electrotechnical Commission IEC testing standard) 376Ωmm 2 / piece;

[0036] Adhesion level O;

[0037] 3. Heat-resistant annealing process of steel plate samples

[0038] Equipment model: hydrogen (nitrogen) protection electric furnace;

[0039] Annealing method: 100% nitrogen, atmosphere control method: flow meter control;

[0040] Annealing temperature and time: 780±5℃×2.2h;

[0041] Cooling method: natural cooling with water jacket, cooling to 50 ° C and stopping gas;

[0042] Ventilation starts at 150°C, and it is allowed to push to the cooling section at 400°C, but water cooling is strictly prohibited;

[0043] In the whole process of the experiment, the gas must not be stopped, and the gas is operated. When the sample is pushed ...

Embodiment 3

[0052] 1. Sampling: The steel plate sample size is 300×100mm;

[0053] 2. Detect the interlayer resistance and adhesion of the steel plate sample before annealing, among which:

[0054] Interlayer resistance (according to the International Electrotechnical Commission IEC testing standard) 408Ωmm 2 / piece;

[0055] Adhesion grade A;

[0056] 3. Heat-resistant annealing process of steel plate samples

[0057] Equipment model: hydrogen (nitrogen) protection electric furnace;

[0058] Annealing method: 100% nitrogen; Atmosphere control method: flow meter control;

[0059] Annealing temperature and time: 780±5℃×2.4h;

[0060] Cooling method: natural cooling with water jacket, cooling to 40 ° C and stopping gas;

[0061] Ventilation starts at 180°C, and it is allowed to push to the cooling section at 480°C, but water cooling is strictly prohibited;

[0062] In the whole process of the experiment, the gas must not be stopped, and the gas is operated. When the sample is pushed to...

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Abstract

The invention discloses a method for assessing thermotolerance of cold rolling silicon steel insulation coating. The method mainly comprises sampling, thermotolerance annealing, and observing the surface of the sample after annealing, and is characterized in that the sample is subject to interlayer resistance and adhesiveness test before annealing, the sample satisfying the conditions is put into an annealing furnace for annealing, the surface of the sample is observed after annealing, if the surface of the sample taken out of the furnace has obvious flaws, the sample is judged unqualified; if the surface of the sample taken out of the furnace has no obvious flaws, further test for interlayer resistance and adhesiveness is carried out on the sample, and the thermotolerance of the insulation coating is judged according to the test data. The invention solves the problems in the existing assessing method such as delayed feedback and lack of instructiveness, efficiently assesses the thermotolerance of different variety of insulation coatings, and provides a convenient and fast assessing standard for development and production adjustment of nsulation coating variety.

Description

technical field [0001] The invention relates to a method for testing the heat resistance of insulating coatings, in particular to a method for evaluating the heat resistance of cold-rolled silicon steel insulating coatings. Background technique [0002] Cold-rolled silicon steel is mainly used as the iron core of various motors and transformers. It is an indispensable and important soft magnetic alloy in the electric power, electronics and military industries. It requires low power consumption, small size and light weight. Therefore, in addition to the conventional tensile strength, yield strength, and elongation of steel, and the iron loss and magnetic induction of silicon steel, cold-rolled silicon steel sheets also require smooth and flat surfaces and good insulating coating films. [0003] In order to prevent the short circuit between the iron core laminations and increase the eddy current loss, the surface of the cold-rolled silicon steel plate is often coated with an i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N19/04G01N3/60
Inventor 张本尊姜雨罗理
Owner ANGANG STEEL CO LTD
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