SU869873A1 - Method of producing textured band from fe-si alloys - Google Patents

Description

(54) METHOD OF MANUFACTURING TEXTURED TAPE FROM IRON-SILICONE ALLOYS

I

The invention relates to the metallurgical industry and can be used in factories manufactured cold-rolled transformer steel with a texture (BUT) GOOX.

It is known that the technology of manufacturing cold-rolled transformer steel with texture (BUT) G0013 includes cold rolling a single or double cold rolled 2.5 mm thick rolled stock with intermediate recrystallization annealing at 850®С to the final thickness (0.35-0.25) mm , recrystallization with decarburization otkig at 850 C high-temperature annealing at 115 ° C ri protective atmosphere Tl However, this method of production does not provide high electromagnetic properties.

The known method of manufacturing textured Lesh by single, two-fold or three-fold cold deformation by rolling in rolls with rashnye speeds of hot rolled

2.5 mm tackle with intermediate recri- ation annealing at 8–50 ° C in a protective atmosphere, recrystalline – annealing annealing at 85 ° C, and high-temperature annealing at G23 in a protective atmosphere.

The disadvantage of this method is the low quality of the electromagnetic properties of the products. It has been established that the current rolling method used in rolls rotating at equal peripheral speeds, due to the uneven deformation of the strip, impairs the electromagnetic properties of the products.

The purpose of the invention is to improve the electromagnet properties of the products.

The goal is achieved by the fact that the first run | of at least one cold rolling is carried out in rolls rotating with co. ratio of peripheral speeds equal to

Claims (2)

20 ratio of initial and final strip thickness, with deformation (2-20)% with average specific metal pressure on rolls not lower than 5 kg / mm. The study proved that the combined cold rolling, which makes it possible to combine multi-mill conventional rolling mills and PV mills, on the one hand, provides high strip reduction on multi-roll mills, and on the other hand, improves the electromagnetic properties of the products due to small optimal PV deformations. An example of the implementation method. Testing of the method was carried out on transformer steel NLMZ. A hot check, a 2.5 mm rolled tackle was rounded to rs, with a sgb of mm with intermediate recrystallization with carbon-free annealing at 850 ° C in a nitric gulf (5% N, + 95% NcL). PV-200 CHPI The first cold rolling BTopolS pass was from 0, 6 mm to O, 57 mm with dissolving of the speeds of the rolls with the pressure of the metal on the rolls of L5 kg / mm. For the purpose of comparing the metal of the same neck, it was defosfirovan. Without rolling with the speed of the roll speeds. . Testing showed that the products that populated 1) with the reductive spasheb have specific losses, 5j50 magnetic induction, respectively, O, 95 W / / kg and 1.96 T, and products made by a known method are 1, O2 w / kz. | 1.92 T. Thus, the proposed method allows to improve the specific losses of P.yffo products and O, 05 -O, O7 W / kg, magnetic induction O, 0d 0.04 T. Techno-economic effect1 improvement of product quality, due to which the weight and dimensions of transformers can be reduced, the power consumption during the operation of transformers is reduced. The invention of the method of manufacturing a textured ribbon of iron-silicon alloys, including hot rolling of the billet, cold rolling in rolls with equal circumferential speeds, recrystallization and high-temperature annealing, characterized in that with improvement of the electrical properties of the products, the first pass is at least The second cold rolling of the billet is carried out in rolls rotating with a ratio of peripheral speeds not a nuke of a ratio of initial and final thick strip, with deformation (2-2O)% and average beats lnym pressure metal on the rolls of at least 5 kg / mm. Sources of information received note in the examination 1.Patent № US 2867557, cl. 148-111, 1975. 2. Japanese patent No. 44-1307, cl. 10-183, 1969.