JPS59190326A - Production of grain-oriented high silicon steel strip - Google Patents

Abstract

PURPOSE:To produce easily a grain-oriented high silicon steel strip having an excellent magnetic characteristic by subjecting a high silicon steel strip which is manufactured by a quick liquid cooling method and contains a specific compsn. contg. of silicon to cold rolling at a high draft then to a heat treatment. CONSTITUTION:A high silicon steel strip which is manufactured by a quick liquid cooling method such as an ultraquick double roll cooling method or the like and contains 4.0-10.0wt% Si is cold rolled at >=60% draft under >=1t/mm. force applied thereon by rolling rolls to form the crystal structure contg. {111} <112> and further the rolled material is heat treated to form the crystal texture contg. {110}<001>, by which a grain-oriented high silicon steel strip having an excellent magnetic characteristic is obtd. A magnetic core material having an extremely small iron loss is obtd. by using such high silicon steel strip.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for producing a oriented high silicon iron ribbon.

Structure of the conventional example and its problems High silicon iron containing 4.0 to 10.0 wt % silicon cannot be processed into a thin ribbon because it cannot be processed by rolling or the like. Recently, a high-silicon iron ribbon has been produced by an ultra-quenching method in which molten metal is jetted onto the surface of a moving cooling body to obtain a metal ribbon in 10 to 10 seconds.
It was revealed that this ribbon has workability. Various manufacturing methods, heat treatment methods, or rolling and heat treatment methods were investigated, and (1oo)<o)l>, (1oo)<oo
l＞.

(1o○)<011. >, (110)<O○1>, etc., have been proposed, but the easy axis of magnetization (001)'j5 exists in the longitudinal direction of the ribbon (~ excellent magnetic properties are expected. (11Q) In order to realize the <Ool> texture, heat treatment with a temperature gradient or rolling heat treatment can be considered, but in the former method, the production speed of the ribbon with the texture is 1 stroke/min. In addition, in the latter method, the ribbon is heat-treated, and then rolling and heat treatment are sequentially performed, and the process is extremely complicated.In this way, in the conventional method, the C110) <001> crystal There is a problem in that the manufacturing cost of the ribbon is high because the ability to manufacture the ribbon having texture is poor and complicated.

OBJECTS OF THE INVENTION The present invention eliminates the drawbacks of the conventional method as described above, and
11o) The purpose is to form a high-silicon iron ribbon having a texture of <○01> by simple cold rolling and heat treatment, thereby significantly improving all magnetic properties and supplying a magnetic core material with extremely low iron loss. be.

Structure of the Invention The present invention consists of the following structure. That is, a crystal containing (111)<112> is produced by cold rolling a high-silicon iron ribbon containing 4,0 to 1o, owt silicon produced by a liquid quenching method at a rolling reduction of 60 or more. By fully forming the texture and further heat treatment, (11o)〈○0
It is characterized by forming a crystal texture containing 1>.

As shown in Figure 1, the (111)<112> texture in the ribbon cannot be detected by X-ray diffraction at a reduction rate of less than 60%, but when the reduction rate exceeds 60%, the texture is They appear rapidly, and at 85%, they occupy about 50% of the ribbon. As the rolling reduction rate increases, the proportion of this texture increases. When these ribbons are heat-treated, a (110)〈o○1〉 texture appears, but as shown in Figure 1, the proportion is lower than that before heat treatment.
111) (112') texture. Furthermore, in the rolling process, when this ribbon is cold-rolled by applying a force of 1 ton or more to 7'mm using rolling rolls, the appearance of the (111)<112> texture becomes more pronounced as shown in FIG. Due to subsequent heat treatment (
110) KuO○1> The appearance rate of texture also increases.

Description of examples The configuration of the present invention will be explained in detail with reference to the following examples.

Example 1 Ultra-quenched double roll method as shown in tertiary Na, 6.5 w
Width: 5 mm, thickness: 100 mm, made of t% silicon with the remainder iron
A high-silicon iron ribbon with a thickness of 1 m is produced (-. In the figure, 1 is a molten metal spouting nozzle, 2 is a high-frequency coil for melting alloy,
3 is a molten metal, 4 is a rotating cooling roll, and 5 is an ultra-quenched ribbon. Then, the ribbon was cold-rolled to a thickness of 15 mm using a pair of rolling rolls with a diameter of 20 mm and a rolling reduction of 85 mm.
A thin ribbon of μm was obtained. When the ratio of (111)<112> at this time is measured using a folded X-ray distribution diagram and X-ray analysis, it is found that 4570
1% contained a crystal texture of C111)<112>. Furthermore, this ribbon is heated to 1000℃.

When heat treated under the vacuum of IlX10ff71IH, 5
A texture with 6vo1% (11o) <001> was formed. The coercive force (DC) and iron loss (W10/
15°: 5oHz, IT) i measured 0.4 respectively
50e.

It was 1.2 WAq.

Example 2 A high-silicon iron ribbon of 8 widths and a thickness of 9011n+ made of 7.0 wt% silicon-containing iron was produced by the double roll method, and a force of 1.1 tons/force was applied to the ribbon. Cold rolling was carried out at a reduction rate of 85 using a pair of rolling rolls with a diameter of 15 mm, backed up by a roller, to obtain a ribbon with a thickness of 13.6/1 m. At this time, the ratio of the crystal texture 't of (111)<112> is 1.11, which is 60vo1% of the ribbon.
was occupied. Furthermore, this ribbon was heated to 900℃, I
When heat treated under a vacuum of l 0 mmHg, 6
A texture with (11o)kuo○1> of γvo1% was formed. Coercive force (DC) and iron loss (50H) of this ribbon
z+IT)' i measurement is 0,310e, respectively.
It was 0.87 W/kg.

Example 3 A high-silicon iron ribbon with a width of 1 (J711) and a thickness of 60 μm was prepared by a double roll method, containing 6.0 wt% silicon and the balance iron. A force of 1.5 tons/m was applied to this ribbon. Using a pair of rolling rolls with a diameter of
obtained a thin strip. When measuring the ratio of the crystal texture (111)(112,>) at this time, it is found that 66 vo in the ribbon
It accounted for 1%. Furthermore, this ribbon was heated to 1100℃, lX
When heat treated under a vacuum of 10 Hg, 72 vo
A texture with 1% (11o)<oOl> was formed. Coercive force of this ribbon (@ style).

Iron loss (W1g/so: 50 Hz, IT)
When f is measured, they are 0.270e, o, y2, respectively.
It was W/kq.

Example 4 A high-silicon iron ribbon of 5 widths and 110 μm thick made of 5.5 wt % silicon-containing iron was entirely produced by the double roll method. This ribbon was cold rolled at a reduction rate of 90% using a pair of rolling rolls with a diameter of 20fffilffi which were back-amplified to apply a force of 0.8 tons per hour to a thickness of 11μ.
A thin ribbon of m was obtained. At this time, the ratio of crystal texture (111) (112) is measured.

It accounted for 80 vol1% of the ribbon. Furthermore, when this ribbon is heat-treated in hydrogen at 1000℃, approximately 90vo1%
A texture with (110)〈ool〉 was formed. Coercive force (DC) and iron loss (W+gJo: 5) of this ribbon
0Hz, IT) Q measurement 0.190s, o, e
It was 6W/kg.

Example 5 A high-silicon iron ribbon with a width of 10 mm and a thickness of 40 μm containing 6.5 wt% silicon and the balance iron was prepared by the single roll method shown in Figure 3 (-). Parts corresponding to those in Figure 3a are given the same reference numerals.

The thin strip [1,3) obtained as described above was cold rolled at a rolling reduction of 66% using a pair of 20M diameter rolling rolls which were back-amplified so as to apply a rolling force to give a thickness of 14 mm.
A whole thin strip of μm was obtained. When measuring the ratio of the (111)<112> crystal texture at this time, the a vo1 of the ribbon is
It accounted for %. When this ribbon was further heat-treated in hydrogen at 1000° C., a texture having a (110) Oe1> of about 7 was formed. The coercive force (DC) of this ribbon,
Iron loss (W1g/so: 50Hz, IT)'f: When measured, they are Q and 8 Q Oe, respectively.

1, esW/kg.

The above rolling reduction rate is defined as follows.

Each reed texture includes misorientation (-) within 15 degrees from the ideal orientation.

According to the present invention, ribbons having an entire texture of (110)〈oOl〉 can be obtained, and these ribbons have magnetic properties as shown in FIG. The thickness of each of these ribbons of the present invention is 9 to 1571 m, and the value of a conventional product of approximately the same composition with this thickness is HC-: 0.90e + W + $0' = 17W
/ shows a low value when compared with 9 (-1 (110
) 001>, the value becomes even lower as the degree of orientation improves.

Effects of the Invention As described above, when the ribbon obtained by the present invention is used with a magnetic core, the iron loss is lower than the total E compared to the conventional high-silicon iron ribbon, which is close to non-oriented. This thin strip is very thin, about 10 μm, so it is very suitable for magnetic cores for high frequencies of about 1 to 100 KHz. composition,
It exhibits a high-frequency iron loss value that is 1/3 to 1/4 compared to conventional ribbons of the same thickness.

[Brief explanation of drawings]

Figure 1 is a diagram showing the relationship between the rolling reduction ratio of a rolled ribbon and the ribbon after heat treatment and the ratio of (111) <112> and (110) <001> textures in the ribbon, and Figure 2 The ribbon pressing force during cold rolling is (111) 12>. (110) This is a diagram showing the influence on the appearance of texture. Figures 3a and 3b are diagrams for explaining typical examples of the ultra-quenching method. FIG. 4 is a diagram showing the relationship between the proportion of the (110) <oo 1 > texture in the ribbon that appeared by the method of the present invention and the magnetic properties. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure reduction rate (l foot + rirt force) LU-ru Iτ8'>511'!
'11,7Fj""/111111ff5 3 Figure

Claims (2)

[Claims] (1) 40-10.0wt produced by liquid quenching method
A high-silicon iron ribbon containing % silicon is cold-rolled at a reduction ratio of 60 or higher to form a crystal texture containing (111)<112>, and further heat-treated to form a crystal texture containing (111)<112>.
11o) A method for producing a oriented high-silicon iron ribbon, which is characterized by forming a crystal texture containing <ool>. (2) In the rolling process, the oriented high-silicon iron ribbon is cold-rolled by applying a force of 1 ton/h or more to the high-silicon iron ribbon using rolls. manufacturing method.