DE1483516B2 - Process for producing cube texture in iron-silicon sheets - Google Patents

Description

2. The method according to claim 1, characterized in that in the final annealing individual Sheets, individual stamped parts or continuous strips of oxygen content up to 0.005% can be.

3. The method according to claim 1 or 2, characterized in that at least one of the intermediate anneals between the cold rolling steps as decarburizing annealing in a moist hydrogen atmosphere is carried out.

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35 development of cube texture in iron-silicon sheets, which is characterized by the joint application of the following known measures:

a) Hot rolling of the iron-silicon alloy to form a sheet of 1.01 to 3.8 mm thick, wherein a slab is assumed which contains 2 to 7% silicon, less than 0.015% aluminum, up to 0.5% manganese, less than 0.01% nitrogen, up to 0.05% carbon, remainder iron with a small amount Contains impurities;

b) Annealing the hot-rolled sheet in a non-oxidizing atmosphere at one temperature from 700 to 1100 ° C;

c) a single or multiple cold rolling of the sheet to a final thickness of 0.12 to 0.5 mm;

d) intermediate annealing of the sheet between the cold rolling steps at a temperature which does not exceed 1150 ° C;

e) Final annealing of the cold-rolled sheet, the oxygen content of which does not exceed 0.0035% and its sulfur content at the beginning of the final annealing 0.002 to 0.03% and during of the course of the final annealing should not be below 0.0005%, the cold-rolled Sheet metal at a temperature of 1100 to 1350 ° C in a strongly reducing atmosphere is annealed in such a way that oxides disappear on the surface of the sheet, while observing such an annealing time until an essentially complete secondary recrystallization is achieved, in the sense that at least 70% of the sheet volume is given a cube texture will.

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The invention relates to a method for producing cube texture in sheet metal made of iron-silicon alloys.

In the main patent 1256 239, which does not belong to the state of the art, there is a method for manufacturing such Iron-silicon sheets with a cube texture can be used in a wide variety of electrical devices or machines are used.

Devices of this type often contain magnetic circuits built up from stamped parts, the magnetic flux in the punched parts both in the rolling direction of the sheet and perpendicular to it. To as possible To have low losses in these magnetic circuits is required that in the two directions mentioned a low magnetic resistance should be given. Iron-silicon alloys with a cube texture meet the requirement mentioned, as these alloys both in the rolling direction of the sheet as well as have preferred magnetic directions transverse to it.

There are already methods of creating cube texture known in iron-silicon alloys. Please refer to the German interpretative publications 1009 214, 1029 845, 1058 529, 1111225, 1175 714 and 1191 399 and to British patent specification 961041 and U.S. Patent 3,147,157.

All of these processes include a single or multiple cold rolling of iron-silicon sheets, if necessary with intermediate annealing as well as a final final annealing. With some of these Processes are decarburization, recrystallization or cleaning annealing before cold rolling performed. For others, the final glow is followed by further treatments, such as cooling in a magnetic field, or the final annealing is carried out in two stages with intermediate etching or Polishing. Despite the sometimes considerable effort

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of work steps is the reproducibility of the

Height of the secondary cube grain growth obtained by the known method in the iron-silicon

Share of cube texture in the iron-silicon-blezium sheets during the final annealing in the first place

not completely satisfactory. Line depends on the sulfur content and only in

The invention is based on the object of the second line of oxygen content. The lower the

producibility of a high percentage of oxygen, the faster the grow

Cube texture and thus compared to the familiar cube grains. In general, with sheet metal

and the main patent a greater security and over 0.125 mm thickness the cube grain growth strong

To achieve consistency of the manufacturing process. hindered when the oxygen level is above 35 ppm

According to the invention, this object is thereby achieved. For individual sheets, individual stamped parts or

solves that in improvement of the continuous stripe in the main patent the upper limit allowed

1256239 specified method for generating the O ₂ content should be slightly higher, but the

of cube texture in iron-silicon sheets, the oxygen content at the time when the final annealing

The degree of deformation during cold rolling is 50% and more, even when annealing individual sheets

if the cold rolling from only one stage does not exceed 15 50 ppm.

it says, however, that in multi-stage cold rolling the carbon content of the sheet immediately before the degree of deformation in each stage 30% and more of the final annealing should not be more than 0.01%, that the intermediate anneals are between the two and preferably below 0.005%. Demge cold-rolling stages at temperatures up to 1300 ° C genüber the alloy in block or plate can be performed and that finally the sulfur sen 20 form a carbon content up to 0.05 Vo aufweifelgehalt of the sheet at the beginning of Sekundärrekri-.

stallization, which occurs in the course of the at 1100 to.

1400 ° C final annealing occurs, on pel the sheets are expediently by an internal

an amount of 0.3 to 6 ppm is set. ert, inorganic, heat-resistant material from-

For the formation of the cube texture it has to be separated from each other. A finely divided powder from

furthermore proven to be expedient that at least one aluminum oxide, zirconium oxide or high-purity,

the intermediate anneals between the cold-rolled scrap-free magnesia give good results. That

ten as decarburizing annealing in moist hydrogen-heat-resistant material should be accompanied by calcining

atmosphere is carried out. treated at high temperatures so that the

There is no question of the influence of the sulfur content on the material during the final annealing

inventive method to make it clear, moisture, oxygen or other harmful

in the drawing in substances such as CO, or the like.

A b b. 1 shows a curve that represents the cube texture. The advantage of the method according to the invention

of the sheet depending on that in the sheets once in the evenness of the treated

contains sulfur content. On the abscissa 35 th bands to see the cube texture portion generated

the graphic representation is contained in the sheet metal and on the other hand in the high percentage of the

tene sulfur in percent by weight and on the proper cube texture and finally in that

nate the percentage of the cube texture achieved a good cube texture according to the invention

applied. Furthermore, in proceedings already using only a single

Fig. 2 is a block diagram of the work steps of the 40 gen cold rolling step and thus in a simplified manner

Shown method according to the invention. Way is achieved.

1 sheet of drawings

Claims (1)

I 483 claims: 1. Method for producing cube texture in iron-silicon sheets, consisting of the following Measures: a) Hot rolling of the iron-silicon alloy into a sheet of 1.01 to 3.8 mm thick, assuming a slab that contains 2 to 7% silicon, less than 0.015% Aluminum, up to 0.5% manganese, less than 0.01% nitrogen, up to 0.05% carbon, The remainder contains iron with minor impurities; b) Annealing the hot-rolled sheet in a non-oxidizing atmosphere at a Temperature from 700 to 1100 ° C; c) one or more times cold rolling of the sheet to a final thickness of 0.12 to 0.5 mm; d) intermediate annealing of the sheet between the cold rolling steps; e) Final annealing of the cold-rolled sheet, the oxygen content of which is not 0.0035% and its sulfur content is kept within certain limits at the beginning and during the course of the final annealing is, the cold-rolled sheet in a strongly reducing atmosphere of such Composition is annealed so that oxides disappear on the surface of the sheet, while adhering to a. such annealing time until an essentially complete secondary recrystallization is achieved according to patent 1256 239, characterized in that that the degree of deformation in cold rolling is 50% and more when the cold rolling is only one There is stage, but in a multi-stage cold rolling, the degree of deformation in each Stage 30% and more is that the intermediate anneals between the cold rolling stages be carried out at temperatures up to 1300 ° C and that finally the Sulfur content of the sheet at the beginning of the secondary recrystallization, which in the course of the final annealing carried out at 1100 to 1400 ° C occurs to an amount of 0.3 to 6 ppm is set.