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Hard metals -- Vickers hardness test
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Basic data
| Standard ID | GB/T 7997-2014 (GB/T7997-2014) |
| Description (Translated English) | Hard metals -- Vickers hardness test |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | H70 |
| Classification of International Standard | 77.160 |
| Word Count Estimation | 13,116 |
| Date of Issue | 7/24/2014 |
| Date of Implementation | 2/1/2015 |
| Older Standard (superseded by this standard) | GB/T 7997-1987 |
| Quoted Standard | GB/T 3489; GB/T 4340.2; GB/T 8170 |
| Regulation (derived from) | National Standards Bulletin No. 19, 2014 |
| 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 test methods carbide Vickers hardness. This standard applies to the determination of carbide Vickers hardness. |
GB/T 7997-2014: Hard metals -- Vickers hardness test
---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.
Hardmetals. Vickers hardness test
ICS 77.160
H70
National Standards of People's Republic of China
Replacing GB/T 7997-1987
Carbide Vickers hardness test
Issued on. 2014-07-24
2015-02-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This standard is in accordance with GB/T 1.1-2009 given rules drafted.
This standard replaces 7997-1987 "Carbide Vickers hardness test method" GB/T.
The main changes compared to 7997-1987 standard and GB/T as follows.
--- Added "2 Normative references";
--- For hardness, specified indenter re-description;
--- "6 Sample" added "test surface shall be free of foreign contaminants, especially not with a lubricant";
--- "7 Test Requirements" add "test is generally at 10 ℃ ~ 35 ℃ conduct for demanding test temperature, room temperature should be
Of 23 ℃ ± 5 ℃ ";
--- The "representation of the results" in Appendix C Number standardization guidelines prepared by the general provisions of the standard "in the" GB 1.1-1981 should be "
Word rounding rule, HV hardness value rounding to ten digits. "To" shall GB/T 8170 in numerical rounding rules, will report
Values \u200b\u200brounded to ten digits. ";
--- Modify the presentation part of the method.
This standard by the national non-ferrous metals Standardization Technical Committee (SAC/TC243) centralized.
This standard was drafted. Country Tungsten Materials Engineering Research Center, Xiamen Golden Egret Special Alloy Co., Ltd., Zhuzhou Cemented Carbide Group
Limited.
The main drafters of this standard. Zhu Guirong, Pin Chen Dong, Xie Hai Wei, Shou whole, Zhang Shubin, Peng Xin.
This standard replaces the previous version of the release of case.
--- GB/T 7997-1987.
Carbide Vickers hardness test
1 Scope
This standard specifies the test methods carbide Vickers hardness.
This standard applies to the determination of carbide Vickers hardness.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein
Member. For undated references, the latest edition (including any amendments) applies to this document.
Metallographic determination of GB/T 3489 carbide porosity and uncombined carbon
GB/T 4340.2 metallic materials - Vickers hardness test - Part 2. verification and calibration of hardness
GB/T 8170 repair value expressed about the rules and limit values \u200b\u200band judgment
3 Test principle
The two opposing top surface having a predetermined angle of a rectangular pyramidal diamond indenter with certain test force into the surface of the sample, keeping provisions
After time, removable test force, indentation diagonal measurement of the sample surface, shown in Figure 1. Vickers hardness and indentation test force divided by the surface area
Suppliers proportional indentation is considered the ideal shape with a square base and with the same angle of the indenter.
a) Vickers hardness indentation b) indenter (diamond cone)
1 a schematic diagram test
4 symbols, description and unit
4.1 symbols, and units described in Table 1.
...
