关键词: 断带, 轧制, 脆性夹杂物, 塑性夹杂物, 裂纹

Abstract: The cause of cold-rolled broken strip of silicon steel was analyzed, so as to further improve the preparation process of silicon steel and reduce the probability of cold-rolled broken strip. The experimental results showed that the contents of brittle inclusions such as AlN and Al2O3 in the fractured part and unfractured part of cold-rolled broken strip are respectively 26.03 % and 29.65 % higher than those of the qualified samples, while the contents of plastic inclusions such as sulfides and complex nitrogen sulfides are 64.75 % and 56.14 % lower than those of the qualified samples. During the rolling process, brittle inclusions will form gaps around them, and these cracks will form cracks, forming long cracks under the action of rolling force, and eventually causing band breakage.In order to reduce the belt breakage, 0.03 %~0.05 % Sn element can be added to reduce the proportion of brittle inclusions in the inclusions, and meanwhile extend the duration of the argon blowing station during 2~3 min smelting, which can make the inclusions evenly distributed, and prevent the accumulation of brittle inclusions, and ultimately reduce the probability of cold-rolled broken strip.

Key words: broken strip, rolling, brittle inclusion, plastic inclusion, crack