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GB/T 2522-2017

Chinese Standard: 'GB/T 2522-2017'
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Detail Information of GB/T 2522-2017; GB/T2522-2017
Description (Translated English): Methods of test for the determination of coating insulation resistance and coating adhesion of electrical strip and sheet
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H21
Classification of International Standard: 77.040.99
Word Count Estimation: 7,759
Date of Issue: 2017-07-12
Date of Implementation: 2018-04-01
Older Standard (superseded by this standard): GB/T 2522-2007
Adopted Standard: IEC 60404-11-2012, NEQ
Drafting Organization: Wuhan Iron and Steel Co., Ltd., Baoshan Iron and Steel Co., Ltd., Shougang Corporation, Metallurgical Industry Information Standards Institute
Administrative Organization: National Steel Standardization Technical Committee (SAC / TC 183)
Proposing organization: China Iron and Steel Industry Association
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People Republic of China, China National Standardization Administration Committee
Summary: This standard specifies the electrical steel strip (sheet) coating insulation resistance and adhesion of the test method. This standard is applicable to the testing of insulation resistance and interlaminar resistance of non-oriented and oriented electrical strip (sheet) surfaces, as well as the adhesion of non-oriented and oriented electrical strip (sheet) insulation coatings.

GB/T 2522-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.040.99
H 21
Replacing GB/T 2522-2007
Methods of Test for the Determination
of Coating Insulation Resistance and
Coating Adhesion of Electrical Strip and Sheet
(IEC 60404-11.2012, Magnetic Materials - Part 11. Method of Test for the
Determination of Surface Insulation Resistance of Magnetic Sheet and Strip, NEQ)
ISSUED ON. JULY 12, 2018
IMPLEMENTED ON. APRIL 01, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Coating Insulation Resistance Test ... 5
3 Test Method of Coating Adhesion ... 10
Foreword
This Standard was drafted as per the rules specified in GB/T 1.1-2009.
This Standard replaced GB/T 2522-2007 Methods of Test for the Determination of
Surface Insulation Resistance and Lamination Factor of Electric Sheet and Strip;
compared with GB/T 2522-2007, this Standard has the major changes as follows.
--- Change the standard name from Methods of Test for the Determination of
Surface Insulation Resistance and Lamination Factor of Electric Sheet and Strip
to Methods of Test for the Determination of Coating Insulation Resistance and
Coating Adhesion of Electrical Strip and Sheet;
--- Modify the test circuit diagram of coating insulation resistance;
--- Delete the test method B of coating insulation resistance;
--- Add test method with total area of 10 contacts of 1000mm2;
--- Modify the provisions of the total current of 10 contacts;
--- Add the calculation of interlayer resistance coefficient;
--- Add the repeatability and reproducibility requirements for the coating insulation
resistance test;
--- Add the coating adhesion levels.
This Standard was prepared by using re-drafting law and with reference of IEC 60404-
11.2012 Magnetic Materials – Part 11. Method of Test for the Determination of Surface
Insulation Resistance of Magnetic Sheet and Strip; the consistency with IEC 60404-
11.2012 is not equivalent.
This Standard was proposed by China Iron and Steel Industry Association.
This Standard shall be under the jurisdiction of National Technical Committee for
Standardization of Steel (SAC/TC 183).
Drafting organizations of this Standard. Wuhan Iron and Steel Company Limited,
Baoshan Iron & Steel Co., Ltd., Shougang Corporation, and China Metallurgical
Information and Standardization Institute.
Chief drafting staffs of this Standard. Liu Jizhong, Shen Jie, Xiang Qian, Shi Jianrui,
Wang Yujie, Hu Shoutian, Tang Ling, Gong Jian, Liu Baoshi, Wei Haili, Zhou Xing, and
Qiu Yi.
Methods of Test for the Determination
of Coating Insulation Resistance and
Coating Adhesion of Electrical Strip and Sheet
1 Scope
This Standard specifies the test methods for the determination of coating insulation
resistance and coating adhesion of electrical strip and sheet.
This Standard is applicable to the surface insulation resistance and interlayer
resistance test of non-oriented and oriented electrical steel strip and sheet; and the
insulation coating adhesion test of non-oriented and oriented electrical steel strip and
sheet.
2 Coating Insulation Resistance Test
2.1 Measurement principle
Franklin Method that can only perform single coating measurement shall be adopted.
The device circuit schematic diagram is shown in Figure 1. Under the specified voltage
and pressure, press 10 fixed-area metal contacts against a coating surface of the steel
plate. Evaluate the effectiveness of surface insulation coating by measuring the current
through 10 contacts.
Key.
Take ±5% or less test method determining the uncertainty to test the total force exerted
by all contacts on the specimen under test.
2.4 Device confirmation
The confirmation of the device is suitable to take the following three types.
a) Under the rated test pressure, apply the contacts and the drilling bit to a clean
copper plate; the total current through the 10 contacts shall be 1.0×(1±3%)A; if
the actual situation doesn’t match, check the cleanliness of the contacts, the
sharpness of the drilling bit and the contact resistance.
b) Under the rated test pressure, pressure the carbon paper onto the white paper
through the contacts; at this time, even indentation occurs instead of the sign of
force concentration. Replace the carbon paper and white paper by a force
measurement board that exerts pressure and is displayed by changing the color
density.
c) Successively connect the 0.1Ω, 1Ω, 10Ω and 100Ω standard resistances in
between the drilling bit and contact pole-shoe; the indication value is stable and
reach the required current level.
2.5 Test procedures
2.5.1 Place the specimen between the test bench and 10 contacts; slower exert a
certain force. exert the force of 1290×(1±5%)N to the total area of 645mm2; exert the
force of 2000×(1±5%)N to the total area of 1000mm2, which is equivalent to the
pressure of 2N/mm2.
2.5.2 Power the electrode with a regulated power supply, and read the total current
(or read by the computer).
2.5.3 If the test is to evaluate the single-side coating insulation quality, take 10 data
by the 10 contacts on the 10 representative different areas or 10 test specimens.
2.5.4 If the test is a comprehensive evaluation ......
Related standard:   GB/T 5167-2018  GB/T 1550-2018
   
 
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