This standard specifies the calibration method for standard Vickers hardness blocks used for indirect testing of Vickers hardness testers according to GB/T4340.2. This method is only applicable to indentations with a diagonal length of not less than 0.02Omm. The force values ​​in this standard are converted from kilogram-force (kgf) values. These force values ​​were quoted before the adoption of the International System of Units (SI). The benefits of quoting integer values ​​of test force (integer Newton values) in SI units and the consequences for the relevant hardness scales will be considered and studied in the next revision of the international standard. By then, this standard will also be revised accordingly as the international standard changes. GB/T 4340.3-1999 Metal Vickers hardness test Part 3: Calibration of standard hardness blocks GB/T4340.3-1999 Standard download decompression password: www.bzxz.net

GB/T 4340.3-1999
This standard is formulated by combining and revising the original two national standards of "standard Vickers hardness block" on the basis of the equivalent adoption of the new international standard ISO6507-3:1997 "Metallic materials Vickers hardness test Part 3: Calibration of standard hardness blocks". The overall structure, hierarchy, writing method and technical content of this standard are completely consistent with ISO6507-3:1997, and conform to the provisions of the national standard GB/T1 "Guidelines for standardization work" series of standards. This standard has the following minor differences in editing from the equivalently adopted international standard ISO6507-3: a) A foreword is added.
b) Since the international standards cited in Chapter 2 "Cited Standards" of IS(6507-3 have been transformed into Chinese standards to varying degrees, the corresponding Chinese standards are directly cited in Chapter 2 "Cited Standards" of this standard. This standard makes the following revisions to the two independent national standards of "Standardized Vickers Hardness Blocks" GB/T7663-1987 "Standard Vickers Hardness Blocks" and GB/T17199-1997 "Calibration of Standard Vickers Hardness Blocks (less than HV0.2)": 1. In line with the overall structural changes of the international standard "Vickers Hardness Test", the two different national standards GB/T7663-1987 and GB/T17199-1997 are merged into one standard - GB/T4 Part 3 of 340. The national standard GB/T4340 is under the general title of "Metal Vickers hardness test", which consists of the following three parts: Part 1: Test method; Part 2: Verification of hardness tester; Part 3: Calibration of standard hardness block. 2. In the scope of application, the small force standard Vickers hardness block with a test force range of 1.961~<49.03N is supplemented. 3. The thickness of the standard block is uniformly specified.
4, modified 5. The shape, length (or outer diameter) and width (or inner diameter) dimensions, hardness value stability, inspection rules and packaging regulations of the standard Vickers hardness block with a test force range of 49.03 to 980.7N have been cancelled to keep it consistent with IS06507-3:1997. 6. A schematic diagram of the allowable error of the square section of the demonstration indenter (see Figure 1) and Chapter 9 (Validity) have been newly added. This standard has been implemented since 1997. From the date of implementation, it will replace GB/T7663-1987 and GB/T17199-1997. This standard is proposed by the State Machinery Industry Bureau
This standard is under the jurisdiction of the National Testing Machine Standardization Technical Committee. The responsible drafting unit of this standard: Changchun Testing Machine Research Institute. Participating drafting units: Shanghai Material Testing Machine Factory, China Institute of Metrology, Quanzhou Donghai Instrument Hardness Block Factory. The main drafters of this standard: Wang Xuezhi, Cheng Bing, Rong Zongze, Li Zhijuan, Chen Zhiming. GB/T 4340.3-—1999
ISOForeword
ISO (International Organization for Standardization) is a worldwide federation composed of national standardization bodies (ISO member bodies). The work of formulating international standards is usually completed by ISO's technical committees. If the member bodies are interested in the standard promotion projects established by a technical committee, they have the right to participate in the work of the committee. International organizations (official or unofficial) that maintain relations with ISO may also participate in the relevant work. In the field of electrotechnical standardization, ISO maintains a close cooperative relationship with the International Electrotechnical Commission (IEC). Draft international standards formally adopted by the technical committee are submitted to the ISO for approval. Submit to the member bodies for voting. International Standards are published only if they are approved by at least 75% of the member bodies voting. International Standard ISO 6507-3 was prepared by Technical Committee ISO/TC 164, Mechanical Testing of Metals, Subcommittee 3, SC3, Hardness Testing.
This standard (second edition of ISO 6507-3) replaces ISO 640:1984 and ISO 640-2:1993 and makes the following revisions: - Two different international standards for the calibration of standard hardness blocks (ISO 640:1984 and ISO 640-2:1993) have been merged into this part of ISO 6507.
A new Figure 1 has been added to illustrate the permissible error of a square section of an indenter. - A new table (Table 3) has been added on the estimated capability and maximum permissible error of the measuring device. The indicator for the maximum permissible value of the uneven hook of the standard block in Table 3 has been modified. A new Chapter 9 has been added on the validity of the standard push block. ISO 6507 is under the general title "Vickers hardness test for metallic materials" and consists of the following three parts: - Part 1: Test method,
- Part 2: Verification of hardness testers;
- Part 3: Calibration of standard hardness blocks. 390
1 Scope
National Standard of the People's Republic of China
Metallic Vickers hardness test---Part 3:Calibration of hardness reference blocks
Metallic Vickers hardness test---Part 3:Calibration of hardness reference blocksGB/T 4340.3 - 1999
idt ISo 6507-3:1997
Replaces GB/T7663--1987
GB/T 17199-1G97
This standard specifies the calibration method for the standard Vickers hardness blocks used for indirect inspection of Vickers hardness testers according to GB/T4340.2. This method is only applicable to indentations with a diagonal length of not less than 0.020 mm. The force values ​​in this standard are converted from kilogram-force (kgf) values. These force values ​​were quoted before the adoption of the International System of Units (SI). The benefits of quoting integer values ​​of test force (integer Newton values) in SI units and the consequences for the relevant hardness scales will be considered and studied during the next revision of the international standard. At that time, this standard will also be revised accordingly as the international standard changes. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T1031-1995 Surface roughness parameters and their values ​​(neqISO468:1982) GB/T4340.1-1999 Metal Vickers hardness test Part 1: Test method (eqVISO6507-1:1997) GB/T4340.2-1999 Metal Vickers hardness test Part 2: Verification of hardness tester (idtISO6507-2:1997) GB/T13634-1992 Standard force measuring instrument for testing machine inspection Sensor type standard force measuring instrument (neqIS376:1987) 3 Manufacture of standard blocks
3.1 Standard blocks should be specially prepared, and the manufacturer should pay attention to the manufacturing process to be used so that the blocks can obtain the necessary homogeneity, structural stability and uniformity of surface hardness.
3.2 The thickness of each metal block to be calibrated should not be less than 6mm. 3.3 The standard block should be non-magnetic. It is recommended that the manufacturer should ensure that the steel blocks are demagnetized at the end of their manufacturing process. 3.4 The maximum allowable error of the flatness of the test surface and the support surface of the standard block should not exceed 0.005mm; the maximum allowable error of parallelism should not exceed 0.010 mm/50 mm.
3.5 The test surface of the standard block should not have scratches, scratches and other defects that affect the indentation measurement. The surface roughness parameter Ru of the test surface should not exceed 0.05μm; the support surface should not exceed 0.8um; the sampling length t should be 0.80mm (see GB/T1031). 3.6 After the standard block is calibrated, no material should be removed from the standard block. To facilitate this inspection, the thickness should be marked on the block during calibration, accurate to 0.01mm; or identification marks should be made on its test surface. (See Chapter 8). 4 Standard machine
4.1 In addition to meeting the requirements specified in GB/T4340.2, the standard Vickers hardness machine should also meet the requirements of 4.2. 4.2 The standard machine shall be directly inspected, and the inspection cycle shall not exceed one year. Approved by the State Administration of Quality and Technical Supervision on October 10, 1999 and implemented on March 1, 2000
Direct inspection includes:
a) inspection of test force;
b) inspection of pressure head;
c) inspection of measuring device;
d) inspection of test force holding time.
GB/T 4340. 3 —1999bzxz.net
The equipment used to inspect the standard machine shall have the traceability of qualified verification to the legal measurement units of the People's Republic of China. 4.2.1 Each test force shall be accurate to ±0.0 of the nominal test force specified in GB/T4340.1.Within 1% (for normal force and small force hardness); within ±0.5% (for microhardness). Force should be measured using a 0.1 grade standard dynamometer in accordance with GB/T13634-1992 or by other methods with the same accuracy.
4.2.2 The four faces of the diamond regular tetrahedron should be highly polished and free of surface defects, and its flatness should be within 0.0003mm. 4.2.3 The angle between the two opposite faces of the top of the diamond pyramid should be 136°±0.1°. The angle between the axis of the diamond pyramid and the axis of the indenter handle (perpendicular to the mounting surface) should be less than 0.3°. 4.2.4 The top of the diamond indenter should be inspected using a high-power measuring microscope or preferably an interference microscope. If the four faces do not intersect at a point, the length of the intersection of the two opposite faces should be less than 0.001mm; for microhardness tests, the length of the intersection should not exceed 0.00025mm. 4.2.5 The quadrilateral (see Figure 1) formed by truncating the four faces of the cone with a plane perpendicular to the axis of the diamond pyramid with an angle of 90°±0.2° shall be inspected.
Permissible error of square section in Figure 1
4.2.6 The required estimation capability of the measuring device depends on the size of the smallest indentation to be measured. The graduation of the measuring device scale and the estimation capability of the indentation diagonal shall comply with the provisions of Table 1. 392
Diagonal length d
GB/T4340.3—1999
Estimation capability of measuring device
Maximum allowable error
±0. 000 2 mm2
4.2.7 The measuring device shall be inspected by measuring at least five intervals in each working range using a standard push scale. The maximum allowable error of the measuring device shall comply with the provisions of Table 1. 4.2.8 For microhardness test, the maximum permissible vibration acceleration transmitted to the standard machine shall be 0.005gn (g. = 9.80665m1/s2, which is the free fall acceleration of the standard).
4.2.9 The time from the start of force application to the full test force and the approach speed of the indenter shall meet the requirements of Table 2. The duration of the test force application shall be 13 to 15s. Table 2
Test force range
1.961≤F<49.03
F≥49.03
5 Calibration method
Time of applying test force
Approach speed of indenter
0. 05 ~0. 2
0. 05 ~ 0. 2
The standard block shall be calibrated on the standard push machine described in Chapter 4 of this standard using the general test method specified in GB/T4340.1 within the temperature range of (23±5)°C.
6 Number of indentations
Five indentations shall be evenly distributed on the entire test surface of each standard push block. 7 Hardness uniformity
7.1 Arrange the arithmetic mean values ​​d,, d2, *~ds of the diagonals of the measured indentations in ascending order from small to large. Under the specified calibration conditions, the hardness uniformity of the standard push block is determined by the following difference: ds - d,
and expressed as a percentage of?, where:
a=d+d±+d
7.2 The maximum allowable values ​​of the hardness uniformity of the standard block are given in Table 3. Instructions for use:
1] There is no "士\" in ISO6507-3:1997, and the "±" in this column is added by this standard. 363
Hardness of standard block
>225 HV
1) The larger one shall prevail.
8 Mark
GB/T4340.3—1999
Maximum allowable values ​​of hardness uniformity of standard block (expressed as a percentage of), Xing
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