Permanent magnet material?

Which material is MOST suitable for permanent magnet? soft iron, cast iron or steel. I‘m thinking cast iron what you think?

This Site Might Help You. RE: Permanent magnet material? Which material is MOST suitable for permanent magnet? soft iron, cast iron or steel. I'm thinking cast iron what you think?

Is Iron A Permanent Magnet

Soft iron generally refers to magnetically soft iron. which has a very low coercivity. High silicon steel is generally used for this purpose. Mild steel also tends to have low coercivity. The coercivity of cast iron is about three times higher, but for practical purposes cast iron is still magnetically soft. The remainent magnetism in cast iron and mild steel are about the same, Actually, I think mild steel has slightly higher remainence. Coercivity is a measure of how much energy it takes to chage the magnetic field of a material. Remainance is a measurement of how much magnetic field remains after any external sources of magnetic field are removed or turned off. Desirable properties in a permanent magnet are HIGH coercivity and high remainent magnetism. The best material for permanent magnets is neodymium-iron-boron alloy Nd2Fe14B the second best material is the samarium-cobalt alloy Co5Sm. These materials have remainent magnetism and coercivities thousands of times higher than steel or cast iron.