Effect of Tin Addition and Condition of Inter-pass Aging in Cold Rolling on Secondary Recrystallization of Grain-oriented Electrical Steel

Abstract

A study was made on the effect of the inter-pass aging during cold rolling on the secondary recrystallization of the grain-oriented electrical steel with Sn produced by the single-stage cold rolling process. The following conclusions were obtained. (1) The specimen without Sn yields a perfect secondary recrystallization structure in case of no inter-pass aging and 200°C inter-pass aging, but no secondary recrystallization in case of 300°C inter-pass aging. This failure of secondary recrystallization is attributed to the smallest amount of the product of {110} and {111} densities in the primary texture, that is, the smallest opportunity of meeting for Goss nuclei with easily consumable grains by them. The specimen with Sn yields a perfect secondary recrystallization structure in all cases of the inter-pass aging mentioned above. This is attributed to the small size of primary grains, the large amount of the product of {110} and {111} densities in the primary texture, and the large amount of effective inhibitors. (2) The core loss of the specimen with Sn cold rolled with the inter-pass aging is very small because of the high magnetic flux density and the small size of secondary grains.