Abstract: The transverse crack in non-oriented electrical steel was tested in this paper, and the continuous casting technology in production process, including the pressure of fan-shaped section, secondary cooling strength, booster pump, liquid core reduction, was investigated and analyzed. The results showed that the causes of the surface transverse crack in nonoriented electrical steel was the segregation of phosphorus element in steel, which caused the grain boundary brittleness and reduced the high temperature plasticity of steel, and the thermal or mechanical stress of the slab with liquid core in No. 1 fanshaped section exceeding the steel’s threshold stress at elevated temperature. The surface transverse crack has been effectively controlled since increasing the equipment precision of No. 1 fanshaped section, and  slowing down the secondary cooling  of No. 1 fanshaped section.

Key words: transverse cracks, secondary cooling intensity, segregation, grain boundary brittleness