Magnetic Properties of Iron and Low-Carbon Steel for Soft Magnet Application
NAVAL WEAPONS CENTER CHINA LAKE CA
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An investigation was conducted to assess the relative merits of five soft magnet materials proposed as alternatives to ARMCO Electromagnet Iron EMI , which is no longer available. Four irons and an SAE J403 1005Unified Numbering System UNS G10050 steel were considered. When annealed in 94 nitrogen-6 hydrogen at 843 degrees C 1550 degrees F for 4 hours and aged at 100 degrees C 212 degrees F for 400 hours, two of the irons were found to be equivalent to EMI with regard to both coercive force and magnetic stability. A third iron exhibited similar magnetic properties after annealing, but required a higher annealing temperature to reduce the coercive force to an acceptable value. The fourth iron and the 1005 steel met the coercive force requirement after annealing at 843 degrees C 1550 degrees F in 94 nitrogen-6 hydrogen, but suffered significant increases in coercive force during aging at 100 degrees C 212 degrees F.
- Metallurgy and Metallography
- Electricity and Magnetism