What are the requirements for non-oriented electrical steel?

14 Dec 2023
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GNEE Steel CRNO Electrical Steel 
Non-oriented electrical steel, also known as silicon steel sheet, is an important soft magnetic alloy indispensable in the power, electronics and military industries. It is also a metal functional material with a large output. Non-oriented electrical steel is mainly used in various motors, generators, The core of the transformer. Non-oriented electrical steel is a silicon steel sheet that forms a non-directional deformation crystal structure according to a certain production process. Cold-rolled non-oriented silicon steel sheets are mainly used in the manufacture of generators and motors. In production, the steel billet or continuous casting blank is hot rolled into a roll with a thickness of about 2.3 mm. When manufacturing low-silicon products, the heat-connected reel is pickled and then cooled to a thickness of 0.5 mm at one time. When manufacturing high silicon products, after hot pickling (or pickling after normalization at 800 ~ 850), cold rolling to 0.55 or 0.37mm thickness, annealing at 850 in a continuous furnace in a hydrogen and nitrogen mixed atmosphere, and then after 6 ~ 10% Under negative pressure and cooling to a thickness of 0.50 or 0.35mm, particles will grow during the degradation of cold rolling at such low pressure and speed. These two cold-rolled plates were conducted in a continuous furnace for 850 seconds under a 20% hydrogen and nitrogen mixed atmosphere. of degradation, and then coated with an insulating film of phosphate and chromate. After cold rolling, the steel strips are supplied with a thickness of 0.35 mm and 0.5 mm in finished product thickness.
CRNO Silicon Steel 
What are the requirements for non-oriented electrical steel? Let's analyze it together.

Recent research shows that the cleaning requirements for non-oriented electrical steel are:

Existing harmful impurities 3360C2010-6, S2010-6, N2010-6, O1510-6;

Magnetic harmful elements 3360ti 15 10-6, v 30 10-6, Zr 30 10-6, nb 30 10-6,

(1) The elements of non-oriented electrical steel that are conducive to or dually affect the magnetic properties of non-oriented silicon steel are 3360 (1) Aluminum 3360 aluminum has a similar effect to silicon. Aluminum increases resistance, reduces the austenite phase area, promotes grain growth, and plays a role in achieve certain beneficial effects. However, the role of aluminum is affected by the nitrogen content in silicon steel. Aluminum and nitrogen easily form AlN precipitate phases, which reduce the magnetic properties of silicon steel sheets. When the size of the precipitated AlN particles is less than 0.5m, nails will be driven into the grain boundaries, hindering grain growth and increasing iron loss. However, if the size of the precipitated AlN particles is larger than 1m, the pinning effect on the grain boundaries will be weak and will have little effect on the magnetic properties of the sample.

    (2) Phosphorus can improve the magnetic properties of iron-silicon alloy. Phosphorus can form iron phosphide at grain boundaries and improve the stampability of silicon steel. The deflection of grain boundary phosphorus hinders the nucleation and growth of recrystallized particles in unfavorable {111} directions, thus increasing the magnetic induction. At the same time, phosphorus will increase the resistance of silicon steel and reduce iron loss.

    (3) Plutonium 3360 can increase the resistance of silicon steel and reduce iron loss. But the role of manganese has a lot to do with sulfur content. The MnS produced when the hot rolling heating temperature is lower than the MnS solution temperature can be rough. When the MnS solution temperature is exceeded, MnS dissolves and disperses during the subsequent cooling process, and the magnetic properties decrease.

    (4) Trace amounts of tin under specific limits of tin 3360 promote the formation of beneficial tissues, improve self-awareness, and reduce iron loss.
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