An Investigation on Boron-Treated Steels (9th Report). On the Effects of Boron-Addition to the Magnetic Properties of “Fe-Mn” Magnet-Steel (II)

Abstract

The addition of boron to manganese magnet-steels containing 12∼14% Mn produces good results and the best effect appears in steel containing comparatively small amount of Mn, say, 12%. That is, manganese steel containing 12% Mn without having any kind of good properties for magnet, becomes to have the same properties as steels containing 13∼14% of Mn by adding such a very small amount of boron as 0.003%. Moreover, when the specimens were rolled into thin-sheets instead of rolling into the square blocks, rod or wire, the addition of boron produces even better results, that is, the coersive force and the residual magnetic induction are increased considerably. The addition of Ni (1.0∼3.0%) or Cr (3.0%) to “Fe-Mn” magnet steel containing 13% Mn and 0.003% B is not profitable for improving its magnetic properties.