Production process of silicon steel

09 Dec 2022
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1、Smelting
Silicon steel is mainly smelted in oxygen converter furnaces (also available in electric arc furnaces), with vacuum treatment of the steel and AOD technology (see Refining outside the furnace, using die casting or continuous casting methods. Depending on the application, the silicon (0.5 to 4.5%) and aluminum (0.2 to 0.5%) content is changed during smelting to meet different magnetic requirements. The amount of silicon and aluminum in high grade silicon steel sheets is increased accordingly. Carbon, sulfur and inclusions are minimized.
2、Rolling
The magnetic properties, surface quality, filling factor and punching properties of cold-rolled silicon steel sheets are better than those of hot-rolled silicon steel sheets, and can be produced in rolls, so some countries have stopped producing hot-rolled silicon steel sheets since the 1960s. China uses about 900 ℃ low temperature once fast hot rolling and hydrogen protection into a stack of annealing method to manufacture hot-rolled silicon steel sheet, the material rate is higher, the finished surface quality and magnetic properties are better.
3、Pickling
Removal of oxides from hot-rolled steel strip by descaling machine with hydrochloric acid tank to prevent defects on the surface of the finished cold-rolled product.
4、Cold rolling
In order to ensure the thickness and material for different applications, the reduction ratio is set at 40%-90% and advanced control equipment is provided for the realization of automatic thickness control and automatic shape control.
5、Annealing
It is the process of softening the hardened steel strip material in the cold stamping process. We produce steel for deep processing and high tension steel by heating and rapid cooling of the metal, and we use box (cover annealing) annealing and continuous annealing methods.
Insulation coating
When silicon steel plates are processed into cores, an insulating coating solution is sprayed underneath the plates to improve their processing properties and prevent eddy current losses equivalent to the thickness of the plates themselves, using continuous coating equipment.

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