Summary and comparison of main global standards of sintered Ndfeb
Sintered NdFeB is a "magnet king" with a wide range of applications, superior magnetic properties, and high cost performance in magnetic materials. It is widely used in industry, manufacturing and high-tech industries. China is the world's largest producer and exporter of sintered NdFeB. In 2018, China produced about 155,000 tons of sintered NdFeB blanks, and exported about 33,000 tons of NdFeB magnets to six continents in the world. Many countries, of which Germany, Japan and the United States are China's largest exporters of rare earth permanent magnets.
Sintered NdFeB is widely used around the world, and countries have different regulations on the grades and performance requirements of sintered NdFeB. Today I will take you to understand the requirements of our major trading countries on the national standards of sintered NdFeB. .
Globally, the mainstream international standard for sintered NdFeB is IEC 60404-8-1 designated by the International Electrotechnical Commission (IEC). The current latest version is the 2015 version (many domestic and foreign NdFeB grade standards circulated on the Internet The comparison article is still using the 2005 version or even the 1998 version, please pay special attention to the timeliness of the version). IEC is the first international electrotechnical standardization organization established in the world, and it is now one of the three major global standards organizations (the other two are the International Organization for Standardization ISO and the International Telecommunication Union ITU).
The European Union's standards for sintered NdFeB are basically the same as the IEC standards. Countries such as the United Kingdom and Germany all use the European Union standard EN 60404-8-1:2015, but there are some adjustments in the file format and language of the standards of each country, such as the United Kingdom The standard is BS EN 60404-8-1:2015, and the German standard is DIN EN60404-8-1:2015.
China's current national standard for sintered NdFeB is GB/T 13560-2017, issued by the General Administration of Quality Supervision, Inspection and Quarantine and the National Standardization Management Committee, and will be implemented in May 2018. There are 1992 editions, 2000 editions and 2009 editions in history, all of which have now been abolished. The normative references disclosed in China's sintered NdFeB national standards do not include IEC international standards. That is to say, although China is also a member of IEC, the formulation of China's NdFeB national standards mainly considers domestic status and Usage habits, no reference to international standards.
The United States uses both IEC 60404-8-1:201 and ASTM A1101-6-16. ASTM is the abbreviation of the American Society for Testing and Materials. In addition, the United States also uses the NdFeB standard specified by the MMPA Magnetic Material Production Association and the IEEE Institute of Electrical and Electronics Engineers.
The current national standard for sintered NdFeB in Japan is JIS C 2502:2019 issued by the Japan Institute of Technology and the Japanese Standards Committee. The standard is formulated with reference to the IEC standard, but there are more grades with higher performance than the IEC standard, and some IECs are eliminated. Grades with lower performance in the standard.
Now that we have found the sintered NdFeB standards of our major trading countries, we might as well put them together for comparison. The horizontal axis in the figure below represents the remanence, and the vertical axis represents the intrinsic coercivity. According to national standards, we compare each The products of the brands are placed in the coordinate system one by one. You can find many interesting conclusions by comparing in the figure.
Among the national standards, the American ASTM standard has the most product brands, followed by China's GB/T 13560-2017; and the IEC international standard has the least number of brands.
In terms of performance requirements, the Chinese standard is relatively close to the American ASTM standard. Under the same intrinsic coercivity, the remanence requirements of Chinese products are higher. There is currently no brand with similar performance to China's TH series sintered NdFeB in IEC international standards and Japanese national standards.
