SU784960A1 - Method of producing super thin cold-rolled textured fe-3%si alloy band from /001/-texture billet - Google Patents

Description

Union of Soviet

Socialist

Republics

0.) 784960

O P I S A N I E

Inventions

TO AUTHOR'S CERTIFICATE (61) Additional to author. certificate-wu (22) Declared 04.24.78 (21) 2607975 / 22-02 with the addition of application No. (23) Priority -

Published 07.1280. Bulletin No. 45

Date of publication of the description 09.1280 (51) M. Cl. ³

B 21 V 3/00 (53) UDC621.77.

.04 (088.8) (72) The inventors V.N. Lozova, V.N. Vydrin, L.M. Ageev I.B. K. Sokolov

Chelyabinsk Polytechnic Institute. Leninsky (71) Applicant of the Komsomol (54) METHOD FOR MANUFACTURING THE THINEST COLD-TEXTURED TEXTURE Fe-3% Si ALLOY TAPE FROM BILL WITH TEXTURE (110) [001] ·

The alleged invention relates to the metallurgical industry and can be used in the production of the thinnest textured electrical steel, in particular 5, to electrical steel 0.08-0.05 mm thick with a predominant grain orientation along the [001] axis. .

A known method of manufacturing a cold-rolled strip of Fe-3% Si alloy, including cold rolling in rolls. Rotating at equal speeds, a coarse workpiece with a texture (110) [001] with a thickness of 0.45-15 .0.28 mm to a final thickness of 0.080, 05 mm followed by recrystallization annealing at 1000-1100 ° C in a protective atmosphere [1].

There is also known a method for manufacturing the thinnest cold-rolled textured Fe-3% SI alloy ribbon, which includes cold rolling in rolls rotating at equal peripheral speeds, coarse-grained billet with texture (110) [001] to a final thickness and annealed at 10001100 ° С in a protective atmosphere [2].

The disadvantage of the prototype is the low quality flatness of products. 3Q

An extreme case of distortion of the flatness of these products is the formation of a defect in the form of bubbles, which is a strong local expansion of metal with the existing transverse folds (corrugations).

An experimental study found that the low quality of the flatness of products made by the known method is due to the uneven deformation of the workpiece grains. The existing scattering of the texture (1ΪΌ) E001] in the tackle leads to the fact that grains with an ideal orientation of (110) [001] are deformed in a different way than grains deviated in the plane or direction from the ideal orientation. This phenomenon is exacerbated by orientational changes in the process of deformation. So, at small degrees of deformation, grains with orientation (110) £ .001] are deformed more easily, and grains with a deflected orientation are more difficult. With an increase in the degree of compression, the orientation (110) £ 001] becomes stable (111) [112], which is more difficult to deform during rolling than the orientation obtained from initially deviated from the ideal orientation. All the 3 properties from 10 improve the electrical quality of plan20 softer, I deform strongly, “the current orientation is (100) foil]. It is the presence of such orientations with a deformation of 60-80% that leads to the formation of a bubble. Orientations of this type are obtained by rolling from grains deviated from (110) [001] both in the plane and in the ho direction. The presence of orientation orientation (100) [o 11] in the texture can reduce electromagnetic ----- ~ ~~~ lines.

. The purpose of the invention is the magnetic properties and the purity of the products. The goal is achieved by the fact that the cold * deformation of the workpiece is carried out in rolls $ 1, rotating with a ratio of speeds equal to the ratio of the thickness along the inlet and outlet of the rolls, with the metal pressure on the rolls 40-60% of the yield strength of the tape and tension strips at the exit from the rolls 45-65% of the 6 _S tape.

. Changing the ratio of stress * Compression and tension significantly affects the orientation changes in the grains, and, accordingly, on the hardening and deformation of individual sections of the strip. In this case, unlike the prototype, rolling with a ratio of roll speeds can be carried out with a metal pressure on the rolls significantly lower than 6 d of metal, and the ratio between squeezing and tensile stresses can be adjusted over a wide range without changing the strip compression. It has been experimentally established that “when rolling with different roll speeds, carried out with pressure. metal on the rolls 40-60% of the base cast by pulling the strip at the exit from the rolls 45-65% of the tape, the grain deformation of the workpiece is carried out without: the formation of bubbles. On the whole, the picture of the evolution of orientations of tackle grains in the deformation mode indicated above is as follows: as in ideal, flowing and ”in deviated orientations, the formation of a stable orientation of the type (100) toll] is difficult. The ideal orientation (110) [001] transforms into (111) [112], which persists to very high degrees of deformation. In contrast to the prototype, the deformation 'occurs with the absence of doubletness, which makes the sites in place of the grains of the (110) tool]: softer πό relative to the deformation. Deviated from the ideal “· 'Toria” ^ grain ’grains' Pass either to (111) £ 112] or to (112) [011], which are also preserved to' high degrees of deformation.

The indicated changes in the texture state reduce the difference in the hardening and deformations of individual grains., 0f <Syi ”cW8e pronounced orient- '. VNIIPI Order 8713/8 ίροΒΟΚ type (100) toil] after rolling in the proposed mode leads to the elimination of defective bubbles, as well as to some improvement of the Duality of the finished thin tape.

deviation of the rolling regime from the recommended one can lead to a deterioration of the flatness of the products (with an increase in the metal pressure on the rolls, a decrease in the strip tension) or to a deterioration in the electromagnetic properties of the tape (decrease in pressure, increase in tension).

The method was tested on Fe-3 $ Si alloy. Rolling of a workpiece 120 mm wide with a texture of (110) [001] was carried out from a thickness of 0.28 mm to 0.05 mm at the NPE-200 CHP laboratory mill according to the 0.28- 0,18-0,11-0,07-0,05 mm, and heat treatment and technical testing of products was carried out at the Institute of Physics and Mathematics of the Ufa Scientific Center of the USSR Academy of Sciences.

For comparison, a number of samples were made in a known manner. Testing showed that the proposed method for manufacturing the thinnest cold-rolled textured Fe-3% Si alloy ribbon from a workpiece with a (110) [001] texture compared to the known one _; method improves the quality planshet- ¹ NOSTA products by 30-90% at complete elimination of defects such as reduced specific ne remagn ichiv en ue 0.4 W / kg.

Thus

a) improve the quality of flatness of products by 30-90%;

b) to reduce the specific loss of energy on the magnetization reversal of products.

bubble and energy loss on products by 0.2 method will allow:

Claims (1)

Claim Subscription .. A method of manufacturing the thinnest cold-rolled textured Fe-3% S i alloy ribbon from a workpiece with a (110) tOOl] texture, including cold rolling of the workpiece, recrystallization annealing, characterized in that, in order to improve the electromagnetic properties and the flatness of the products, the rolling is carried out with a mismatch the speed of the rolls at a ratio of speeds equal to the ratio of the thickness of the strip at the inlet and. exit from the rolls, with a metal pressure on the rolls of 40-60% of the yield strength; tape and strip tension, at the exit of the rolls 45γ65% of 6 _& . tapes.