Abstract: The effect of oxide layer at different coiling temperatures on pickling of  non-oriented silicon steel with mass fraction of Si between 1.5 % and 2.0 % was studied. The results showed that: a dense oxide layer of 2-4 μm thick was existed on the surface of the hot rolled plate when coiling temperature at 690 ℃, and after pickling the oxide layer was still 1-3 μm thick; but when the coiling temperature at 570 ℃, the existing 2-4 μm thick oxide layer on the surface of the hot rolled plate was almost disappeared after pickling, and the pickling efficiency was greatly improved.

Key words: coiling temperature, non-oriented silicon steel, pickling