GB/T 43432.2-2023 in English
VALIDMetallic materials—Barcol hardness test—Part 2:Verification and calibration of hardness testers
- Issued on:2023-11-27
- Implemented on:2024-06-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$214.00
《GB/T 43432.2-2023金属材料 巴氏硬度试验 第2部分：硬度计的检验与校准》由TC122（全国试验机标准化技术委员会）归口，主管部门为中国机械工业联合会。
Introduction
1. Introduction
GB/T 43432.2—2023 specifies the inspection and calibration methods for Barcol hardness testers, aiming to ensure the accuracy and reliability of the hardness test results of metal materials. This standard is the second part of the GB/T 43432 series "Barcol hardness test for metal materials", which mainly focuses on the technical requirements and inspection procedures of hardness testers.
2. Principle of Barcol hardness test
The Barcol hardness test characterizes the hardness of a material by measuring the depth to which the indenter is pressed into the surface of the specimen under the action of a spring force. The shallower the indentation depth, the higher the hardness of the material. The formula is as follows: HBa = 100 - d / 0.0076, where d is the indentation depth (unit: mm).
3. Classification and technical parameters of hardness tester
| Hardness tester type | Indenter cone angle | Nominal value of force spring coefficient (N/mm) |
|---|---|---|
| Type A | 26° | 12.4 |
| Type B | 26° | 1.25 |
| Type C | 40° | 1.25 |
4. Comparison of direct and indirect inspection
| Test method | Test object | Applicable scenarios |
|---|---|---|
| Direct test | Indenter and measuring indicator device | First test, re-inspection after maintenance |
| Indirect test | Comprehensive performance of hardness tester | Regular calibration, inspection during use |
5. Technical details and implementation suggestions
Importance of indenter testing
The indenter is a key component in the Barcol hardness test. Its cone angle, diameter and surface roughness directly affect the test results. Table 1 lists the technical parameter requirements of the indenter in detail:
| Item | Technical indicators |
|---|---|
| Cone angle | 26°±0.25°, 40°±0.25° |
| Top plane diameter | 0.157±0.02mm |
Uncertainty analysis of indirect inspection
Indirect inspection is carried out through a standard hardness block, and its measurement uncertainty is determined by multiple factors. Table A.1 shows the calculation process of the combined standard uncertainty:
| Serial number | Measured hardness value HBa |
|---|---|
| 1 | 88.7 (maximum value) |
| 2 | 87.2 |
| 3 | 87.3 |
| 4 | 87.5 |
| 5 | 86.5 (minimum value) |
6. Implementation recommendations
To ensure the accuracy and reliability of the hardness tester, it is recommended that:
- Inspect and calibrate strictly according to the standard cycle.
- Test within the range of 10°C to 35°C, and record the temperature and humidity conditions when necessary.
- Choose a suitable standard hardness block for indirect inspection to ensure its calibration validity period.
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