JPS6149380B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a novel electrical steel sheet produced by primary recrystallization. L (rolling direction) and C of conventional non-oriented electrical steel sheet
The magnetization characteristics (in the direction perpendicular to the rolling direction within the rolling plane) and in each direction within the rolling plane were rather similar. For this reason, conventional steel plates are suitable as cores for one-punch type rotating machines, but they are not optimal for EI cores, segment-type rotating machine cores, or transformer cores, where L characteristics are important. The present invention is an EI, a segment type rotating machine,
The purpose of the present invention is to provide a steel plate with excellent L magnetization characteristics at a low cost for use in cores such as transformers where the L magnetization characteristics are particularly important. The steel plate of the present invention has C0.01~0.001%, Si2.0~3.5
%, Mn 0.1-0.4%, Al 0.01-0.70%, S 0.02% or less, the balance consisting of iron and unavoidable impurities, three axes of body-centered cubic lattice crystal, namely [100], [010], [001] During,
An electrical steel sheet produced by primary recrystallization, characterized in that axial magnetic domains whose angle with L is smaller than the angle with C (coincident with the axial direction and 180° magnetic domains) occupy 65% to 95% of the total domain area. , the particularly excellent steel sheet of the present invention has a magnetic domain in the same direction and 180° direction as the axis in which magnetization in the L direction of the crystal is easiest, and in the direction of the axis in which magnetization in the C direction is easiest in the triaxial direction. The number of magnetic domains is more than twice as large as that of the magnetic domain. Here, the percentage of magnetic domains close to the L direction is statistically determined from the torque curve, the inverse pole figure, the magnetostriction curve diagram, and the explanatory diagram of the magnetic domain structure of a typical crystal (FIG. 1). The reason why we limited it to 65% to 95% of the total area of the magnetic domain is that up to about 60% can occur even in general electrical steel sheets, and the reason we set it to almost 95% is the limit both theoretically and practically. Because there is. When the steel sheet of the present invention is magnetized in the L direction, the proportion of magnetization due to the movement of the 180° domain wall is much larger than the proportion of the movement of the 90° domain wall, which requires a large magnetizing force for domain wall movement. Therefore, there is an advantage that L requires less magnetizing force to obtain the desired magnetic flux density, and the iron loss of L is also reduced. Moreover, one of the most remarkable effects of the present invention is that magnetostriction, which is a cause of noise in transformers, etc., is extremely small in L. Examples of the steel plate of the present invention are shown below in terms of components, magnetization rotational force curves, inverse pole figures, and magnetization characteristics. Example 1 Ingredients: C 0.003%, Si 3.0%, Mn 0.21% Al 0.56%, S 0.004%, balance iron and inevitable impurities DH, CC, double cold rolling method. Steel plate thickness 0.35mm, magnetic domain approximately 90% in the present invention,
The magnetization torque curve of this steel plate is shown in FIG. 2, and the inverse pole figure is shown in FIG. Example 2 Ingredients: C 0.0026%, Si 2.7%, Mn 0.21% Al 0.31%, S 0.005%, balance iron and inevitable impurities, DH, CC, double cold rolling method. Steel plate thickness 0.35mm, magnetic domain approximately 80% in the present invention,
The magnetization torque curve of this steel plate is shown in FIG. 4, and the inverse pole figure is shown in FIG. Example 3 Ingredients: C 0.005%, Si 2.8%, Mn 0.20% Al 0.41%, S 0.004%, balance iron and inevitable impurities, DH, CC, double cold rolling method. Steel plate thickness 0.50mm, magnetic domain approximately 80% in the present invention,
The magnetization torque curve of this steel plate is shown in FIG. Comparative Example Components: C 0.004%, Si 2.9%, Mn 0.20% Al 0.45%, S 0.004%, balance iron and unavoidable impurities, by conventional method. Steel plate thickness 0.35mm, magnetic domain approximately 55% in the present invention,
The magnetization torque curve of this steel plate is shown in FIG. Next, Table 1 shows the magnetization properties of each example and comparative material.

[Table] Figure 8 shows the magnetostriction of Example 1 at a magnetic flux density of 0.5 (T) and
The measurement results for the case of 1.5 (T) are shown below.

[Brief explanation of the drawing]

Figures 1A, 1B, and 1C are auxiliary diagrams for explaining the steel plate of the present invention, including typical crystal magnetization structure explanatory diagrams,
Figures 2 and 3 are magnetization rotational force curve diagrams and inverse pole figures in Example, respectively, and Figures 4 and 5 are Example 2.
Fig. 6 is a magnetization rotational force curve diagram and inverse pole figure in Example 3, Fig. 7 is a magnetization rotational force curve diagram in a comparative example, and Fig. 8 is a magnetization rotational force curve diagram in Example 1 as a function of magnetic flux density. 0.5(T), 1.5
It is a figure which shows the result measured in case (T).

Claims (1)

[Claims] 1% by weight, C: 0.001-0.01%, Si: 2.0-3.5
%, Mn: 0.1-0.4%, Al: 0.01-0.70%, S:
0.02% or less, the remainder consists of Fe and unavoidable impurity elements, and has the smallest angle (angle in three-dimensional space) with the rolling direction among the magnetic domains in the three-axis <100> direction of the body-centered cubic lattice crystal. An electrical steel sheet produced by primary recrystallization, in which the magnetic domain accounts for 65 to 95% of the total area. 2. The magnetic domain in the crystal axis direction that is most easily magnetized in the rolling direction is larger than the magnetic domains in the other two axis directions, and accounts for 40% or more of the total area of the magnetic domains. Electrical steel sheet produced by primary recrystallization.