GB/T 20567-2020 in English
VALIDVanadium-nitrogen
- Issued on:2020-04-28
- Implemented on:2020-08-01
- File Format:PDF
- Delivery:Within 1 day
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《GB/T 20567-2020钒氮合金》由TC318（全国生铁及铁合金标准化技术委员会）归口，主管部门为中国钢铁工业协会。
Introduction
Core changes in the standard revision
| Technical dimensions | 2006 edition | 2020 edition | Update significance |
|---|---|---|---|
| Grade range | VN12/VN16 | New VN19 | Expand the application of high vanadium content products |
| Vanadium content requirements | VN12:10-14% VN16:14-18% | VN12:10.0-14.0% VN16:14.0-18.0% | Indicators are accurate to decimal points |
| Particle size control | ≤50mm | ≤50mm and <10mm≤5% | Refine the particle size distribution requirements |
Detailed explanation of key technical requirements
Chemical composition control
The new version of the standard adds a strict requirement of nitrogen content ≤4.0% for VN19 grade, and ensures the accuracy of trace element detection through inductively coupled plasma atomic emission spectrometry. Typical application cases show that the vanadium recovery rate of VN16 grade is increased by 2.3% compared with the old version.
Test method upgrade
- Particle size determination: Cancel the mechanical screening method and uniformly adopt the manual scoring method
- Apparent density: VN19 density threshold is reduced to 2.6g/cm³ to adapt to the characteristics of new materials
- Sample preparation process: Added grinding particle size control (≤0.125mm) requirements
Implementation suggestions
The practice of Pangang Group shows that the implementation of the new version of the standard needs to focus on:
- Establish a special laboratory for density testing using the aluminum oxide vibration compaction method
- Update ICP-AES equipment to meet the GB/T 24583 series testing requirements
- The thickness of the moisture barrier layer of the packaging should be ≥0.12mm
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