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GB/T 7991.5-2014: Test method of viterous and porcelain enamels -- Part 5: Determination of thickness by electromagnetic method
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 7991.5-2014 | English | 169 |
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Test method of viterous and porcelain enamels -- Part 5: Determination of thickness by electromagnetic method
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GB/T 7991.5-2014
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Basic data | Standard ID | GB/T 7991.5-2014 (GB/T7991.5-2014) | | Description (Translated English) | Test method of viterous and porcelain enamels -- Part 5: Determination of thickness by electromagnetic method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G94 | | Classification of International Standard | 71.120; 25.220.50 | | Word Count Estimation | 7,791 | | Date of Issue | 12/5/2014 | | Date of Implementation | 7/1/2015 | | Older Standard (superseded by this standard) | GB/T 7991-2003 | | Regulation (derived from) | Announcement of Newly Approved National Standards 2014 No. 27 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This Standard specifies the method for measuring the thickness of the magnetic layer of glass-lined on the substrate. This section applies to the measurement of the magnetic substrate glass-lined equipment glass lining layer thickness. | GB/T 7991.5-2014: Test method of viterous and porcelain enamels -- Part 5: Determination of thickness by electromagnetic method
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Test method of viterous and porcelain enamels Part 5.. Determination of thickness by electromagnetic method
ICS 71.120; 25.220.50
G94
National Standards of People's Republic of China
Replacing GB/T 7991-2003
Glass-lined layer test method
Part 5. measuring the thickness of the electromagnetic method
Part 5. Determinationofthicknessbyelectromagneticmethod
Issued on. 2014-12-05
2015-07-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
GB/T 7991 "Test method for glass-lined layer" is divided into 10 parts.
--- Part 1. Alkali corrosion measurement solution;
--- Part 2. Determination of resistance to boiling and acid vapor corrosion;
--- Part 3. thermal shock resistance;
--- Part 4. resistance to mechanical shock;
--- Part 5. electromagnetic method to measure the thickness;
--- Part 6. High voltage test;
--- Part 7. Determination of the average linear thermal expansion coefficient;
--- Part 8. Determination of scratch resistance;
--- Part 9. Determination of tensile strength;
--- Part 10. lead, cadmium contents.
This section GB/T 57991 Part of.
This section drafted in accordance with GB/T 1.1-2009 given rules.
This Part replaces GB/T 7991-2003 "enamel coating thickness measurement of electromagnetic Law", compared with the GB/T 7991-2003, the main technical
Surgery changes are as follows.
--- Cancellation impact on measurement accuracy of the contents of the original standard glass-lined layer thickness about 3.1;
--- Increasing the calibration matrix metal should simulate the firing process after heat treatment requirements;
--- Increase for surface corrosion of the metal substrate can not be used for calibration.
This part is proposed by the China Petroleum and Chemical Industry Association.
The glass-lined equipment in part by the National Standardization Technical Committee (SAC/TC72) centralized.
This section drafted. Zhejiang Nyaya Health and Technology Co., Ltd., Shenyang Donghua detection Instrument Factory, Guangzhou special pressure equipment to detect RESEARCH
Study Institute, Zhejiang Jingwei Group Environmental Protection Engineering Co., the chemical industry of non-metallic materials and equipment for Quality Supervision and Inspection Center.
The main drafters of this section. Huang Yuan Gong, Zhang goods, Limao Dong, Wang Shunhai, Sang Lin Chun, should love, Zhang surgery width, Da Jing.
This part of the standard replaces the previous editions are.
--- GB/T 7991-1987, GB/T 7991-2003.
Glass-lined layer test method
Part 5. measuring the thickness of the electromagnetic method
1 Scope
GB/T 7991 This section specifies the method for measuring the thickness of the magnetic layer of glass-lined on the substrate.
This section applies to the measurement of the magnetic substrate layer thickness of glass-lined glass-lined equipment.
Principle 2
Electromagnetic measurements through the cover layer and changes in magnetic resistance of the base metal and a thickness of the cover layer.
3 Factors affecting the measurement accuracy
3.1 Magnetic base metal
Affected magnetic gauge base metal magnetic change (change in magnetic low carbon steel may be considered minor), in order to avoid heat treatment
Standards and cold factors, application and DUT base metal of the same nature to calibrate the instrument. Preferably by firing simulation
Metal matrix heat treatment process before the glass-lined not calibrated.
3.2 the base metal thickness
Each instrument is DUT base metals requires a critical thickness beyond this thickness, the measured value will not be base metal
The impact of increased thickness. If the instrument manufacturer is not critical thickness values \u200b\u200bof this station apparatus is provided, it shall be determined by experiment.
3.3 Edge Effect
DUT mutations will affect the accuracy of the surface shape of the magnetic thickness gauge. So, too close to the number of test DUT at the edges or corners
It is not reliable unless the above conditions for the instrument calibration done. This effect may extend to the corners at 15mm.
3.4 Curvature
The smaller the radius of curvature of the DUT, the more significant the impact. This has a significant relationship with the type of instrument.
With the thickness measurement of a bipolar probe, the probe placed parallel to the cylinder axis or vertical, readings will be different. If unipolar probe
Probe irregular wear occurred, it would have a similar phenomenon.
Therefore, before the bend specimens measuring instrument to be calibrated specifically for this case. Otherwise, the measurement data is not reliable.
3.5 Surface roughness
If the DUT within a rough surface area measured by reference to the same range of values \u200b\u200bsignificantly exceeds the inherent repeatability of the instrument, the
At some point the number of measurements should be increased to at least 5 times.
3.6 matrix metal machining direction
When the probe with bipolar or unipolar uneven wear probe measuring instrument, instrument readings will be magnetic matrix metal machining (eg
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