GB/T 41329-2022 in English
VALIDDetermination of flow rate of metallic powders—Calibrated funnel method (Gustavsson flowmeter)
- Issued on:2022-03-09
- Implemented on:2022-10-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$146.00
《GB/T 41329-2022金属粉末流动性的测定 标准漏斗法（古斯塔弗森流速计）》由TC243（全国有色金属标准化技术委员会）归口，TC243SC4（全国有色金属标准化技术委员会粉末冶金分会）执行，主管部门为中国有色金属工业协会。
Introduction
Analysis of the core content of the standard
This standard is equivalent to the ISO13517:2020 international standard, which specifies the method of measuring the fluidity of metal powders using the Gustafsson rheometer. The main technical points include:
| Technical elements | GB/T41329-2022 requirements | Comparison with traditional methods |
|---|---|---|
| Test principle | Measure the time for 50g powder to pass through a standard funnel | Hall rheometer method |
| Applicable objects | Carbide powder/mixed powder containing organic additives | Limited to pure metal powder |
| Calibration materials | Chinese corundum (40.0±0.5s/50g) | No unified calibration material |
Key technical requirements of the instrument
Standard funnel must meet the following requirements:
- Material: non-magnetic and corrosion-resistant metal
- Aperture tolerance: medium grade according to ISO2768-1
- Initial calibration flow rate: 40.0±0.5 sec/50g
Calibration specifications
When the flowmeter is used:
- Time decreases → possible outlet wear
- Time increases → powder adhesion needs to be cleaned
- It is recommended to scrap it when the flow rate is <37 sec
Test precision data
Based on 17 laboratory verification of 6 typical powders:
| Powder type | Average time (s) | Repeatability limit (r) | Reproducibility limit (R) |
|---|---|---|---|
| Atomized iron powder | 25 | 0.9 | 1.8 |
| Bronze powder containing lubricant | 45 | 7.3 | 9.0 |
Implementation suggestions
Powder pretreatment specifications
Vacuum drying should be used for easily oxidized powders, and drying is prohibited for powders containing volatile components. When a company tested atomized copper powder, the result deviation due to lack of drying reached 12%.
Automated test optimization
The standard allows the use of 90-110g samples for automatic measurement. Please note:
Final result = actual measurement time × (50/actual sample weight)
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