METHOD FOR PRODUCING HIGH non-oriented electrical steel of high magnetic properties

摘要

1. Process for producing a highly non-oriented electrical steel having high magnetic properties, comprising the following steps: 1) smelting and casting of the chemical composition of non-oriented electrical steel is as follows,% by weight:. S≤0,0040%, Si 0,1-0,8% , Al 0,002-1,0%, Mn 0,10-1,50%, P≤0,2%, Sb 0,04-0,08%, S≤0,0030%, N≤0,0020%, Ti≤0,0020%, iron Fe and unavoidable inclusions - the rest; wherein the first melt of molten steel is performed in accordance with the above chemical compositions, and then cast steel rods, 2) hot rolling and pickling: slab heating temperature is 1100-1150 ° C and a finishing rolling temperature - 860-920 ° C; after rolling the hot rolled product is cooled by air during the time of (2 + 30 ּ Sb%) with s≤t≤7; thereafter the strip is wound into a roll at a temperature of ≥720 ° C, 3) Cold rolling: performing rolling to obtain cold-rolled strip with a desired thickness compression ratio of 70-78%; 4) annealing the cold-rolled strip is heated to a temperature of 800-1000 ° C at a rate heating ≥15 ° C / s, the residence time is 10-25 c.2. The method of claim 1, wherein the annealing atmosphere has a composition (part by volume of 30-70%) + H (part by volume 70-30%) N2, dew point is regulated to from -25 ° C to -40 ° C.