GB/T 4138-2024 in English
VALIDRare earth ferrosilicon magnesium alloy
- Issued on:2024-04-25
- Implemented on:2024-11-01
- File Format:PDF
- Delivery:Within 1 day
$125.00
《GB/T 4138-2024稀土镁硅铁合金》由TC229（全国稀土标准化技术委员会）归口，主管部门为国家标准化管理委员会。
Introduction
1. Background and significance of standard revision
Rare earth magnesium silicon iron alloy is an important metal functional material and is widely used in casting, metallurgy and other fields. With the advancement of technology and the diversification of market demand, the original standard GB/T 4138-2015 can no longer fully meet the needs of industry development. This revision introduces new classification methods and technical requirements to improve product quality and meet the needs of high value-added application fields.
2. Comparative analysis of standard frameworks
| Standard dimensions | Requirements of the 2015 version | Improvements of the 2024 version |
|---|---|---|
| Scope of application | Only applicable to light rare earth magnesium ferrosilicon alloys | Add yttrium-based heavy rare earth magnesium ferrosilicon alloys to expand the application field |
| Chemical composition requirements | Basically cover the content of major elements | Refine the total amount of rare earths and the proportion of single rare earths, and add a new magnesium oxide indicator |
| Particle size range | Not clearly specified | Specify 5 particle size grades and limit the proportion of exceeding the standard |
3. Detailed explanation of chemical composition and classification
Rare earth magnesium ferrosilicon alloys are divided into two categories: light rare earth and yttrium-based heavy rare earth. The grades are coded in a graded manner. For example: REMgSiFe-01-CeA indicates a product with a total rare earth content of about 1%, mainly cerium, and a moderate magnesium content.
Table 1 Chemical composition requirements of light rare earth magnesium ferrosilicon alloy
| Grade | REa（%） | Mgb（%） | Si（%） | Ca（%） | Fe（%） |
|---|---|---|---|---|---|
| REMgSiFe-01-LaA | 0.5~2.0 | ≥60 | ≤46.0 | 1.0~3.0 | Remainder |
| REMgSiFe-03-CeD | 2.0~4.0 | 48≥50 | ≤48 | ≥50 |
Table 2 Chemical composition requirements of yttrium-based heavy rare earth magnesium ferrosilicon alloy
| Grade | REa（%） | Mgb（%） | Si（%） | Y/RE（%） |
|---|---|---|---|---|
| REMgSiFe-01-YA | 0.5~1.5 | ≥50 | ≤48 | ≥50 |
| REMgSiFe-05-YA | 4.5~5.5 | ≥50 | ≤46 | ≥50 |
4. Technical improvements and innovations
The new standard has achieved technological breakthroughs in multiple dimensions: introducing particle size control requirements, adding a visual inspection method under natural scattered light, and optimizing the chemical composition detection process. These improvements have effectively improved the stability and consistency of product quality.
5. Implementation suggestions and precautions
- Suppliers: Strengthen raw material management to ensure the quality stability of rare earth and magnesium silicon sources; optimize melting process parameters, focusing on temperature control and stirring uniformity.
- Testing agencies: Equipped with advanced spectrometers (such as ICP-OES) and particle size analysis equipment to ensure the accuracy of test data.
- Users: Choose products with appropriate grades according to specific application scenarios, pay attention to the integrity of the accompanying documents of the products, and properly preserve the quality certificates.
6. Conclusion
The release and implementation of GB/T 4138—2024 marks the entry of the rare earth magnesium silicon iron alloy industry into a higher standard era. By strictly following the requirements of the new standard, all parties can jointly promote product quality improvement and industrial upgrading, and provide more high-quality choices for the application of high-performance materials.
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