GB/T 4340.2-1999 English Translation: Metallic Vickers Hardness Test – Verification of Hardness Testers

Document: GB/T 4340.2-1999, Metallic Vickers Hardness Test – Part 2: Verification of Hardness Testers.

Editorial note: The source file is a scanned Chinese PDF. The English text below was prepared from OCR and machine translation for reading convenience. Please use the embedded original PDF as the authoritative reference, especially for tables, formulas, symbols, and figures.

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English Translation

Page 01

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GB/T 4340.2-1999
Foreword

This standard is pending the adoption of the new international standard ISO 6507-2, 1997 SRM Vickers Hardness Test Part 2: Hardness Tester
Based on the inspection; it was formulated by merging and revising the original two national standards of "Vickers Hardness Tester".

The overall structural hierarchy, writing method and technical content of this standard are completely consistent with ISO 6507-2:1997 and comply with national standards.
The provisions of the "Quasi GB/T Long Standardization Work Guidelines" series of standards.

This standard has the following minor editorial differences with the equivalent international standard ISO 6507-2:
a) MMT RS. |

b) Since the international standards cited in ISO 6507-2 Chapter 2 "Quoted Standards?" have been converted into Chinese standards to varying degrees, so
Chapter 2 "Quoted Standards*" of this standard directly quotes the corresponding Chinese standards.

c) Some terms, such as "indication repeatability error" and "indication error" are commonly used terms for testing machines in my country.

This standard complies with the original two independent national standards for "Vickers Hardness Tester" GB/T 7664-1987 "Vickers Hardness Tester Technical Conditions" and

GB/T 17198—1997¢ 28 RR Oh F HV 0.2) Inspection" has been revised as follows:

1. Consistent with the changes in the overall structure of the international standard for Vickers hardness testing, GB/T 7664-1987 and GB/T 17198-1997
Two different national standards merged into one cost standard – Part 2 of GB/T 4340.

GB/T 4340, under the general heading of "Metal Vickers Hardness Test", consists of the following three parts:

– Part 1: Test methods;

– Part 2: Inspection of hardness tester;

, – Part 3: Calibration of standard hardness blocks.

2. In the scope of application, a small force Vickers hardness tester with a test force range of 1.961 to <<49.03N is supplemented.

3. Partially modified the indicators of the estimation capability of the indentation measuring device (see Table 3).

4. Partially modified the index of repeatability error of hardness tester indication value (see table OMMBRE RR 5).

5. The test force range is canceled from 49.03 to 980.7 N RRR AWE BRE RRM REM,
Packaging and accompanying documentation requirements in order to be consistent with ISO 6507-2.

6. Newly added Chapter 6 (Inspection Cycle), Appendix A (Example of Indirect Inspection Method for Measuring Devices) and Internal Record B (Notes on Diamond Indenter
matters).

This standard will replace GB/T 7664–1987 and GB/T 17198-1997 from the date of implementation.

Appendix A and Appendix B of this standard are both reminder appendices.

This standard is proposed by the State Administration of Machinery Industry.

This standard is under the jurisdiction of the Technical Committee for Standardization of Total Testing Machines.

The unit responsible for drafting this standard: Changchun Testing Machine Research Institute.
Participating units in the drafting: Shanghai Materials Testing Machine Factory, China Institute of Metrology.
ARERR A: BFR MRE. BIER.
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GB/T 4340.2-1999
ISO His

ISO (International Organization for Standardization) is a worldwide federation composed of national standardization groups (ISO member groups). Develop international standards
Standard work is usually completed by ISO technical committees. If each member group is interested in a standard project established by a technical committee, they can
Have the right to participate in the work of the committee. International organizations (official or unofficial) that maintain contact with ISO may also participate in relevant work. in
In terms of electrotechnical standardization, ISO maintains a close cooperative relationship with the International Electrotechnical Commission (GEC).

The draft international standard formally adopted by the technical committee is submitted to the member groups for voting. International standards require at least 75% voting
Only with the approval of the member groups can it be officially released.

International Standard ISO 6507-2 was established by Technical Committee ISO/TC 164 "Mechanical Testing of Metals" SC3 "Hardness Testing? Subcommittee 3"
will be formulated.

This standard (ISO 6507-2 second edition) replaces ISO 146:1984 and ISO 146-2:1993, and has been revised as follows:

One by one, two different international standards for hardness testing (ISO 146:1984 and ISO 146-2:1993) were merged into ISO 6507
this section. ,

– New tables on the estimation capabilities and maximum allowable errors of measuring devices have been added (Table 3).

The durometer repeatability values in Table 4 have been modified one by one.

– New Chapter 6 on the two-inspection cycle has been added.

11 Newly added records A "Example of indirect inspection method of measuring device" using standard indentation).

One by one, appendix B – "Precautions for human diamond indenter" has been added.

ISO 6507 is under the general heading of "Metal Materials Vickers Hardness Test" and consists of the following three parts:

– Part 1: Test methods;

– Part 2: Inspection of hardness tester;

– Part 3: Calibration of standard hardness blocks.

Appendix A and Appendices to this part of ISO 6507 are also for reference only.

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National Standards of the People's Republic of China
4 ; oF ['s GB/T 4340. 2— 1999
= Vickers ‘8°C test idt ISO 6507-2:1997
Part 2: Inspection of hardness tester Replaces GB/T 7664—1987
GB/T 17198–1997
Metallic Vickers hardness test
Part 2: Verification of hardness testers –
1. Scope
This standard specifies the test method for Vickers hardness tester used to measure Vickers hardness according to GB/T 4340.1. –
This standard describes the direct inspection method for testing the basic functions of the hardness tester and the indirect inspection method suitable for comprehensive inspection of the hardness tester. indirect inspection
The test method can be used independently for periodic routine inspection of hardness testers in use.
If the hardness tester can also be used for hardness testing by other methods, the hardness tester must be inspected separately for each method.
Portable hardness testers shall meet all requirements of this standard, but the term "reinstallation" in 6.1a) does not apply to such hardness testers.
The force values ​​in this standard are converted based on the kilogram force (kgf) value. These force values were quoted before the adoption of the International System of Units (SIH).
used. The benefits of quoting the integer value of the test force (integer Newton value) in SI units will be considered and studied in the next revision of the International Standard.

consequences for each relevant hardness scale. At that time, this standard will be revised accordingly as international standards change.
2 Reference standards
The provisions contained in the following standards constitute provisions of this standard through reference in this standard. When this standard was published, the versions indicated were
to be effective. All standards are subject to revision and parties using this standard should explore the possibility of using the latest version of the standard listed below.
GB/T 4340.1-1999 Metal Vickers hardness test Part 1: Test method (eqv ISO 6507-1:1997)
GB/T 4340.3-1999 Metal Vickers hardness test Part 3: Calibration of standard hardness block (idt ISO 6507-3:1997)
GB/T 7997-1987 "Cemented Carbide Vickers Severity Test Method Ceqv ISO 3878:1983)
GB/T 13634-1992 "Standard force measuring instrument for testing machine inspection" sensor type standard force measuring instrument (neq ISO 376:1987)
3 General requirements
Before testing the Vickers hardness tester, it should be inspected to ensure that
a) The hardness tester is installed correctly;
b) The main shaft of the indenter can slide in its guide body;
c) FE RZ fe eh ee EE RAIL;
d) The test force is applied and removed without impact or vibration, and does not affect the reading;
e) If the measuring device and the hardness tester are integrated, then:
1) Switching from test force removal to measurement state does not affect the reading;
2) Lighting does not affect readings;
3) DEN. RI BoD BFR wp.
The illumination arrangement of the measuring microscope should illuminate the entire field of view uniformly and should produce maximum contrast between the indentation and the surrounding surface.
Approved by the State Administration of Quality and Technical Supervision on October 10, 1999 and implemented on March 1, 2000
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GB/T 4340.2-1999
4 Direct inspection
. Direct inspection should be carried out within the temperature range of (23±5) Ni. If inspection is performed outside this temperature range, it should be included in the inspection report
record.
The instruments used for inspection should have proven origins in the legal measurement units of the People's Republic of China.
Direct inspection includes:
a) Inspection of test force;
b) REN;
c) Inspection of measuring devices;
d) Inspection of test force retention time.

4.1 Inspection of test force
4.1.1 Each test force used within the working range of the hardness tester shall be measured. As long as it is suitable, it should be mainly used during the test
The above force measurements are made at at least three positions of the shaft at equal intervals throughout its entire range of movement.
4.1.2 The test force shall be measured by one of the following two methods,
a) Measured with an O.2 level standard force measuring instrument that complies with GB/T 13634-1992;
b) Equilibrated with a force exerted by a standard mass and mechanically amplified to an accuracy of ±0.2%.
4.1.3 At each position of the spindle, three readings should be taken for each test force. The moment before each reading, the movement direction of the spindle should be
The direction of movement is consistent with the test.
4.1.4 Each measurement of force shall be within the tolerance of the nominal test force value given in Table 1.
Table 1
N%:
4.2 Inspection of indenter
4.2.1 The four surfaces of the diamond regular pyramid should be polished and free of surface defects.
4.2.2 The shape of the indenter can be checked by direct measurement or by measuring the projection of the indenter on a projection screen.
4.2.3 The angle between the two opposite surfaces of the diamond pyramid top should be 136" ± 0. 5°C LA 1).
136? 0. 5°
Figure 1 Cone angle of diamond pyramid
4.2.4 The angle between the axis of the diamond cone and the axis of the indenter shank (perpendicular to the mounting surface) should be less than 0.5". The four faces should intersect at one point! Table
The maximum allowable length of the intersection between opposite surfaces is given in 2 (see Figure 2).
Regardless of the direct inspection period of the hardness tester, the inspection period of the indenter should not exceed two years. Please refer to the attachment for precautions regarding the diamond indenter.
Record B (Appendix to the prompt).
2.

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GB/T 4340.2-1999
SK x
a= Bt
2 RKEWRARAREBA
#2

N-mm

4.3 Inspection of measuring devices
4.3.1 The required estimation capability of the measuring device depends on the size of the minimum indentation to be measured.

The graduation of the scale of the measuring device and the ability to estimate the diagonal of the indentation shall comply with the requirements in Table 3.

HE 3
d<0. 040 0. 000 2 mm +0. 000 4 mm
d>0. 040 0.5%d +1.0% 4

The estimation capabilities of indentation measuring devices for Vickers hardness testing of cemented carbide materials are specified in GB/T 7997.
4.3.2 The measuring device should be inspected at least at five intervals for each working range using a standard graduated ruler.

The maximum allowable error of the measuring device shall comply with the provisions of Table 3.
4.3.3 In addition to the above direct inspection, indirect inspection of the measuring device can also be carried out according to the procedure described in Appendix A (informative appendix).
4.4 Inspection of test force retention time

The test force holding time shall comply with the provisions of GB/T 4340.1. The allowable error of the hardness tester time control device is ±1 s.
5 indirect inspection

Indirect inspection should be carried out within the temperature range of (23±5), using a standard hardness block calibrated according to GB/T 4340.3. If this is too long
If the inspection is carried out outside the specified range, it shall be recorded in the inspection report.

Adoption Instructions , .

1] There is no "Science" number in ISO 6507-2. The "Science" number in this column is added by this standard.

2] There are editorial differences between this article and ISO 6507-2. The title of this article in ISO 6507-2 is: "Inspection of test cycle time". Through the ISO

6507-1 After studying the corresponding provisions, it is believed that the essence of this provision is to test the accuracy of the test force holding time. For Vickers hardness tester, it is the test of hardness.
Inspection of the error of the meter time control device, so this standard has made editorial changes to this article. 3

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GB/T 4340.2-1999
5.1 When the hardness tester being tested uses several test forces, at least two forces should be selected for testing. One of the forces should be the maximum
Commonly used test forces. For each selected test force, two standard blocks of different hardnesses should be selected from the different hardness ranges specified below.
The selection of force and block should be appropriate so that at least one standard block in each weight range is used for inspection.
<225HV
400HV~600HV
>700HV;
5.2 When the hardness tester being tested only uses one test force, three standard blocks should be used for testing and each hardness specified in 5.1 should be tested.
Choose one piece from each range.
5. 3. For special circumstances, the hardness tester can be tested at only one hardness value. The tested hardness value should be approximately equal to the one to be tested.
A hardness value.
5.4 Five indentations should be made and measured on each standard block. The test shall be carried out in accordance with GB/T 4340.1.
5.5 Calculate the arithmetic mean di ds,…,ds of the two diagonal lengths of each indentation measured on each standard block in ascending order from small to large.
Arrange in order.
5.6 Under the specified inspection conditions, the repeatability error of the hardness tester’s indication value is determined by the following difference:
The repeatability error of the indication value of the tested hardness tester must meet the requirements of Table 4.
. Table 14
Maximum allowable value of repeatability error of hardness tester indication
MER a” HV
HV5~HVLiOOHV0, 2~<HV5I <CHVO. 2
. ESR A RE HV Hardness of standard block HV
co
225H 0. 03d 0. 06d 0. 06d
200 12 200 24
250 10 250 20

– 350 14 350 28
>225HV| 0. 02d 0.042 0. 05d
600 24 600 48
750 30 750 60
|
5.7 Under the specified inspection conditions, the indication error of the hardness tester is determined by the following difference:
H—H
ten, ae es
_ AH, five; one-to-one hardness value corresponding to ddd;
The factory hardness value calibrated by the standard hardness block used.
The maximum error of the weight meter indication expressed as a percentage of the calibrated hardness value of the standard hardness block shall comply with Table 5 WME.
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GB/T 4340.2-1999
#5 |
What is the maximum allowable error in the hardness tester indication?
Symbol, hardness, HV
50 | 100 | 150 | 200 | 250 | 300 | 350 | 400 | 450 | 500 | 600 | 700 | 800 | 900 |1 00011 500
woo | dP ETT EEE
woos fT | dP Ph
| pwr Te] | PEPE TT
pros Pepe
pws ef fete[ | PTT
pwr fe Pete [els tefefetal TT
pwr se) Pe ce Pe fefatateley TT
pave oe et fe ee fe [foe
pws fe ee ee ee fe
pea | eee ea
ccc
reee
a N

pve ee ee eee ea
ee i
ikB
Ca CS A ED ER ER ERECRES
Avie PCCP PEPLPEPEPE
Note
2 For intermediate values, the maximum allowable error can be obtained by interpolation.
3 The values related to the microhardness tester in the table are given based on the maximum allowable error of 0.001 mm or 2% of the average value of the indentation diagonal length, whichever is greater.
shall prevail. De
6 inspection cycle
6.1 Direct inspection
Direct inspection should be carried out under the following circumstances:
a) When installing the hardness tester or after disassembling and reassembling or reinstalling;
b) When the indirect inspection result is unqualified;
c) The indirect inspection time exceeds one year.
After each direct inspection, indirect inspection should be performed.
6.2 Indirect inspection
The interval between two indirect inspections depends on the level of maintenance and the number of times the hardness tester is used. In no case should this period exceed one year.
5