| 摘要 |
FIELD: metallurgy.SUBSTANCE: invention relates to electric sheet steels. Electric sheet steel with an aligned grain structure comprises grooves, each of which passes in the direction, which intersects the direction of rolling the said sheet steel, herewith the said grooves are formed by a laser beam irradiation with preset PL pitches in the rolling direction. Shape of each of the grooves on the front surface of the said sheet steel is determined as a curved line on the above said steel. Herewith the connection between D value of standard deviation and PL pitch satisfies the following ratio (1), where D value is the standard deviation of distances between a linearly approximated direct line produced from a curved axial line of each groove in the groove width direction by the least squares method and corresponding positions on the said curved axial line, the mean angle formed between tangents in each of the said positions on the said curved axial line and the direction perpendicular to the rolling direction is from more than 0 to 30°: 0.02 ≤ (D/PL).EFFECT: technical result is reduction of iron losses in the sheet steel.5 cl, 7 dwg |
