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GB/T 7991.4-2019: Test method of vitreous and porcelain enamels -- Part 4: Determination of resistance to impact
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Test method of vitreous and porcelain enamels -- Part 4: Determination of resistance to impact
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GB/T 7991.4-2019
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Basic data | Standard ID | GB/T 7991.4-2019 (GB/T7991.4-2019) | | Description (Translated English) | Test method of vitreous and porcelain enamels -- Part 4: Determination of resistance to impact | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G94 | | Classification of International Standard | 71.120; 25.220.50 | | Word Count Estimation | 10,139 | | Date of Issue | 2019-12-10 | | Date of Implementation | 2020-11-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 7991.4-2019: Test method of vitreous and porcelain enamels -- Part 4: Determination of resistance to impact
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Test method of viterous and porcelain enamels--Part 4. Determination of resistance to impact
ICS 71.120; 25.220.50
G94
National Standards of People's Republic of China
Replaces GB/T 7990-2013
Test method for glass lined layer
Part 4. Determination of mechanical shock resistance
Part 4. Determinationofresistancetoimpact
2019-12-10 release
2020-11-01 implementation
State Administration of Market Supervision
Published by the National Standardization Management Committee
Foreword
GB/T 7991 "Test method for glass lined layer" is divided into 10 parts.
--- Part 1. Determination of corrosion resistance of alkaline solutions;
--- Part 2. Determination of resistance to boiling acids and their vapor corrosion;
--- Part 3. Determination of resistance to sudden changes in temperature difference;
--- Part 4. Determination of mechanical shock resistance;
--- Part 5. thickness measurement by electromagnetic method;
--- 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. Determination of lead and cadmium dissolution.
This part is Part 4 of GB/T 7991.
This section is drafted in accordance with the rules given in GB/T 1.1-2009.
This section replaces GB/T 7990-2013 "Test method for resistance to mechanical shock of glass lined layer". Compared with GB/T 7990-2013,
The main technical changes outside the editorial changes are as follows.
--- Modified Chapter 4 "Instruments and Equipment", the steel ball clamping release was changed from "mechanical clamping" to "electromagnetic clamping" (see 4.1, 4.7,.2013
Version 4.1);
--- Increased the storage requirements of steel balls "should be placed in a dry dish when not in use" (see 4.8);
--- Added "The thickness of the sample glass-lined layer shall comply with the provisions of HG/T 3105, or as agreed by the relevant parties, in accordance with GB/T 7991.5 regulations
Measurement method "(see 5.4);
--- Added "Should high voltage test be carried out on the glass-lined layer of the sample according to GB/T 7991.6, the test voltage is 10kV, or by relevant parties
Negotiated "(see 5.5).
This section is proposed by the China Petroleum and Chemical Industry Federation.
This section is under the jurisdiction of the National Glass-lined Equipment Standardization Technical Committee (SAC/TC72).
This section was drafted by. Jiangyin Chemical Equipment Factory, Jingjiang Fangda Precision Molding Technology Co., Ltd., Suzhou Xieli Chemical Equipment Co., Ltd.
Company, Jiangyin Sipu Enamel Co., Ltd., Tianhua Chemical Machinery and Automation Research and Design Institute Co., Ltd.
The main drafters of this section. Xu Guoping, Qian Jianfeng, Hong Jie, Su Tingting, Yu Xianzhong, Sang Linchun, Xiao Lijuan.
The previous versions of the standards replaced by this section are.
--- GB/T 7990-1987, GB/T 7990-2002, GB/T 7990-2013.
Test method for glass lined layer
Part 4. Determination of mechanical shock resistance
1 Scope
This part of GB/T 7991 specifies the test principles, equipment, test specimens, test procedures, and calculation methods for the mechanical impact resistance of glass-lined layers.
Calculation formula and test report.
This section applies to the determination of the mechanical impact resistance of glass-lined flat specimens.
2 Normative references
The following documents are essential for the application of this document. For dated references, only the dated version applies to this article
Pieces. For undated references, the latest version (including all amendments) applies to this document.
GB/T 308.1 Rolling bearing balls Part 1. Steel balls
GB/T 7991.5 Test methods for glass-lined coatings. Part 5. Measurement of thickness by electromagnetic method
GB/T 7991.6 Test method for glass lined layer-Part 6. High voltage test
Preparation of HG/T 3105 steel plate lined glass specimen
3 Principle
A steel ball of a specified quality and diameter falls freely and impacts the glass-lined layer of the sample vertically, and the glass-lined layer is cracked, powdered, peeled, and broken.
The falling height of the steel ball during the cracking phenomenon is calculated by the falling impact energy of the steel ball.
4 Equipment
4.1 The instrument and equipment are shown in Figure 1. The functions of each component are shown in 4.2 ~ 4.14.
4.2 Electromagnetic control switch. It can control the adsorption and release of steel balls.
4.3 Support rod. support steel ball release, height at least 600mm, diameter 30mm, material. carbon steel, chrome-plated outer surface.
4.4 Set screw. Fix the steel ball release at a certain height.
4.5 Connecting rod. connect the supporting rod and the electromagnetic release.The connecting rod should have sufficient strength to ensure that the electromagnetic release will not occur after the steel ball is adsorbed.
bending.
4.6 Laser rangefinder. used to measure the falling height of the steel ball and the impact position of the positioning steel ball, the accuracy should reach. ± 1.5mm.
4.7 Electromagnetic release (see Figure 2). It can provide at least 120g of electromagnetic adsorption force, which is controlled by an electromagnetic control switch (4.2) for adsorption and release
Put the steel ball.
4.8 Steel ball. The diameter is 30mm, the weight is about 110g, and it should meet the requirements of GB/T 308.1. Store in a dry dish when not in use.
4.9 Sand layer. quartz sand, thickness. 6mm ~ 7mm, particle size range. 0.4mm ~ 0.8mm, the sand layer is set to ensure that the sample is placed horizontally.
Place in the sample holder (4.10).
4.10 Specimen holder (see Figure 3). steel parts, chrome-plated on the outer surface, outer dimensions are 160mm × 160mm × 50mm, and the inner hole size is
82mm × 82mm × 10mm, the inner hole is located in the center of the chassis. The specimen holder can move freely on the base.
4.11 base (see Figure 4). steel parts, the outer surface is chrome-plated. The dimensions are 370mm × 270mm × 20mm.
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