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

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AI Technical Summary

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

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