High grade non- oriented silicon steel and method for manufacturing same

Abstract

The invention discloses a high-brand non-oriented silicon steel as well as a manufacturing method, which are mainly characterized in that: chemical constituents thereof include, in weight percent: Si: 2.5 to 3.5 percent, Al: 0.5 to 1.5 percent, C<=0.004 percent, Mn: 0.10 to 1.50 percent, P<=0.02 percent, S<=0.005 percent, N<=0.002 percent, B<=0.005 percent, B / (C+N)=0.5-2.0; and the manufacturing method mainly includes: heating a casting billet to above 1100DEG C in a heating furnace, carrying out rolling, normalizing, acid washing and cold rolling after heat preservation, with the reduction rate of between 70 and 78 percent, and annealing, with d.p. equal to -25 to -40DEG C. The non-oriented silicon steel and the manufacturing method can make electric steel sheets and strips with excellent performance, and can reduce furnace roller nodulations and energy consumption in production, and further reduce the production cost.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a high-grade non-oriented electrical steel with excellent magnetic properties and a manufacturing method thereof. Background technique [0002] High-grade non-oriented silicon steel is mainly used to manufacture iron cores of large motors and generators, and its main magnetic feature is extremely low iron loss. Traditionally, its manufacturing feature is that the silicon content is more than 2.5%, and more than 0.2% aluminum is added to increase the resistance in the steel, thereby reducing the iron loss. Then implement hot rolling, normalization and cold rolling processes, and carry out final annealing and coating insulation layer. In order to reduce iron loss, the final annealing temperature is required to be above 1000°C, even 1075°C. However, the problems brought about by high temperature annealing are high cost, and the second is that the oxide attached to the surface of the stri...

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Problems solved by technology

However, the problems brought about by high-temperature annealing are high cost, and the second is that the oxides attached to the surface of the strip are reduced to iron by hydrogen and accumulate on the surface of the furnace roll, thus causing nodulation of the furnace roll

In order to prevent furnace roll nodules and prolong the service life of furnace rolls, measures are usually taken to improve the material of furnace rolls, such as the use of carbon sleeve rolls, ceramic coated rolls, and the use of floaters in high temperature areas. The method of improving the material of furnace rolls is actually not Did not get good results, the method of using the floater increased the equipment investment, and at the same time, the use of the floater was risky at high temperature

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