What is the composition of 400 magnetic steel? What's the ratio?

Magnetized permanent magnet material, also known as quenched martensite steel, is made of magnetic steel by high temperature quenching. Its main components are iron (Fe), carbon (C) and some other alloying elements, and it is the earliest commercial permanent magnet material used by human beings. 19 10 years ago, the magnetic steel used was 1 .0- 1.5% C ordinary high carbon steel, with low permanent magnet performance, and the maximum magnetic energy product (trillion) max was only 1.6 kJ/m3. Subsequently, tungsten steel containing 6%W and chromium steel containing 1-6%Cr were developed, and their properties were improved compared with those of carbon steel. The great improvement of hardened steel began with 19 17. Japan's bento taro invented the drill steel containing 36%Co, the coercivity Hc increased to 20 kA/m, and the (ugly) max reached 8 kJ/m3o. Magnetic steel can be divided into carbon steel, tungsten steel, chromium steel, diamond steel and aluminum steel according to its chemical composition. The composition and properties of several main magnetic steels are shown in the table. Composition and properties of magnetic steel ┌ ┌ ┬ ┌ ┌ ┌ ┌ ┌ ┌ ┌ ┌ ┌ ┌ ┌ ┌ ┌. The rest Fe│095│5.2│2.4( 17% Co) diamond steel │3 .5 Cr, IC, Yu │0.95│ 13.6│5.2(36% Co) diamond steel │Fe │0-95SC, │ 9474 The ingot is made into the required size and shape by hot forging and hot rolling, and the forging and rolling temperature is 950- 1000℃. Before hardening, magnetic steel can be subjected to hot bending or other mechanical processing. In order to obtain good magnetic properties, it is necessary to heat treat magnetic steel. Firstly, the forged rolled material is treated by solution treatment at the temperature of 1 150- 120, and then quenched at different temperatures. For example, carbon steel is quenched with water at 785 degrees Celsius, chrome steel is quenched with oil at 850 degrees Celsius, and diamond steel is quenched with oil at 950 degrees Celsius. For drilling steel, simple heat treatment sometimes can't achieve satisfactory results, and a three-time heat treatment system is often adopted. For magnetic steel with complex shape, especially high drilling steel, casting method should be used to produce it. With the development of other permanent magnet materials, magnetic steel has been rarely produced and used because of its low performance, serious aging and poor stability. (