GB/T 7997-2014 English PDF

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GB/T 7997-2014: Hard metals -- Vickers hardness test
Status: Valid

GB/T 7997: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 7997-2014	299	Add to Cart	3 days	Hard metals -- Vickers hardness test	Valid
GB/T 7997-1987	399	Add to Cart	3 days	Hardmetals--Vickers hardness test	Obsolete

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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: 13,191
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Older Standard (superseded by this standard): GB/T 7997-1987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. ......

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