China permanent magnet manufacturer:

Main chemical composition of NdFeB magnets

In the trade of NdFeB magnets, the main chemical components of NdFeB magnets need to be provided when enterprises cooperate and export.
NdFeB permanent magnetic material is based on the intermetallic compound Nd2Fe14B. The main components are Nd, Fe and B. The main rare earth element is neodymium (nd). In order to obtain different properties, it can be partially replaced by dysprosium (Dy), praseodymium (PR) and other rare earth metals. Iron can also be partially replaced by cobalt (CO), aluminum (AL) and other metals. The content of boron is small, but it plays an important role in the formation of tetragonal crystal structure intermetallic compounds, making the compounds have high saturation magnetization and high uniaxial strength Anisotropy and high Curie temperature.
The third generation of rare earth permanent magnet Nd-Fe-B is the most powerful permanent magnet in modern times. Its main raw materials are rare earth metal Nd 29% – 32.5%, metal element Fe 63.95-68.65%, non-metal element B 1.1-1.2%, dysprosium 0.6-8%, niobium 0.3-0.5%, aluminum 0.3-0.5%, copper 0.05-0.15%, etc.


  • 1. It is usually placed on a plane that can be adsorbed with a magnet of the same specification, such as patch, blade, iron door, etc. the size of the magnetic force can be distinguished by the hand feeling
  • 2. Use electronic scale: the magnet with weak magnetic force is generally related to its density. If the density is small, the magnetic force is relatively small. If the weight is heavy, the magnetic force is relatively large. On the contrary, if the weight is light, the magnetic force is small. If the requirement for the magnet is relatively high, the instrument test is needed.

38c4758271c5dd391d997608a9252ee 300x300 1 - Main chemical composition of NdFeB magnets

Nd-Fe-B materials are classified according to different environment and demand.
Magnetic energy product: 35-52 (the larger the number, the stronger the magnetism)
Temperature resistance: n (80 ℃), m (100 ℃), H (120 ℃), sh (150 ℃), uh (180 ℃), eh (200 ℃), ah (220 ℃).
Each material magnet manufacturer will configure different rare earth components according to different material brands.
For example, the material composition of N35 is metal neodymium (nd) 31% + metal element iron (FE) 67.2% + non-metal element boron (b) 1.2% + metal dysprosium (Dy) 0.6%
Finally, according to their own machinery and equipment, each manufacturer has different main chemical composition for each brand of NdFeB magnet.



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