Manufacture Process Of Non-Oriented Silicon Steel With High Magnetic Induction

Abstract

A manufacture process of non-oriented silicon steel with high magnetic induction includes smelting and casting steel having a chemical composition by weight percent: Si 0.1˜1%, Al 0.005˜1.0%, C≦0.004%, Mn=0.10˜1.50%, P≦0.2%, S≦0.005%, N≦0.002, Nb+V+Ti≦0.006%, and the rest is Fe. The steel is cast into a billet, which is heated and hot-rolled to 1150˜1200° C. into a plate at a finish-rolling temperature 830˜900° C. The plate is cooled to a temperature ≧570° C. and cold-roll flattened at compression ratio 2˜5%. The flattened plate is normalized at temperature not below 950° C. for 30˜180s, and then pickled and cold-rolled into a sheet with thickness of the finished product. The sheet is finish-annealed quickly heating the sheet to 800˜1000° C. at temperature rise rate ≧100° C. / s, soaking the heated sheet for 5˜60s at the temperature, and then slowly cooling the sheet to 600˜750° C.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]The present application is a continuation of PCT Patent Application No. PCT / CN2011 / 072775 filed on Apr. 14, 2011, which claims priority to Chinese Patent Application No. 201010517872.7 filed on Oct. 25, 2010, both of which are fully incorporated herein by reference.STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT[0002]Not applicable.FIELD OF THE INVENTION[0003]This invention relates generally to a manufacture process of non-oriented silicon Steel, and particularly, to a manufacture process of non-oriented silicon Steel with high magnetic induction.BACKGROUND OF THE INVENTION[0004]Non-oriented silicon Steel is an important magnetic material and widely used in manufacture of various electric machines, compressors and so on. In general, it contains silicon of less than 6.5%, aluminum of less than 3%, carbon of less than 0.1%, and other trace elements. Manufacture process of silicon Steel includes the procedures of hot-rolling,...

AI Technical Summary

Benefits of technology

[0009]The objective of the invention is to provide a manufacture process of non-oriented silicon Steel with high magnetic induction, the manufacture process is characteristic of including the measures: to roll the hot-rolled plate lightly and to heat the cold-rolled sheet quickly to an anneal temperature so as to get non-oriented silicon Steel with high magnetic induction under the precondition of not increasing iron loss of the sheet.

Problems solved by technology

The magnetic properties of non-oriented silicon Steel are very prone to be affected by various factors such as material compositions, thickness, heat treatment procedure, and so on.

If soakage temperature is too high and soakage period is too long, the crystal grains of annealed silicon Steel will be rather coarse, the surface texture {111} will be intensified, and magnetic induction of the sheet will be weakened; contrarily, if diameters of the grains are on the small side, the hysteresis loss of material will be on the large side, which will increase electric loss in end use.

In anneal procedure, as compared to heating at a lower temperature rise rate, heating at a higher temperature rise rate will bring about quite intensive Gauss texture.

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