SU840157A1 - Method of producing isotropic electroengineering steel - Google Patents

Description

(54) METHOD FOR OBTAINING ELECTROTECHNICAL ISOTROPIC STEEL

1Brobsm) T1e is related to the method of KONKHJTTHOe technology to the technology of semi-cold and cold isotrophic electrolyte (X1; stainless steel, a method of producing cold-rolled ipotropic electrotechnical steel, a natural steel, a method of producing cold-rolled ipotropic electrotechnical steel, and a single steel, a method of producing cold-rolled ipotropic electrotechnical steel, and a year ago, a method of producing cold-rolled ipotropic electrotechnical steel, and a year ago, a method of producing cold-rolled and a tropic electrotechnical system, and a year ago, a method of producing cold-rolled, ipotropic electrotechnology, and one-year steel. OZ% u1 carbon The rest is iron, which includes cold rolling of hot rolled strip, decarburization annealing, second cold rolling with slight deformation (1O%), final high-speed annealing at 84 ° C for 4 minutes. The closest in technical essence and dststp- letters The result is a method of producing low-loss and high magnetic induction isotropic silicon steel sheets, which includes carbonizing annealing of a hot strip of the first strip, well rolling, but at least in two stages with annealing annealing, (compression with endgrush on em 470%), final continuous annealing. Intermediate annealing is carried out at 9OO-1OOO C, and final annealing at a temperature of at least OBO C in dry hydrogen or a dry mixture of hydrogen and nitrogen. This method produces steel containing, by weight. %: S4 2.5-3.5} C not more than 0, O2j Mp O, 11, OO, AI 0.3-1.5} S not more than O, OO5; О no more than О ОО2П 2. The disadvantage of the known method is the low magnetic properties of steel. The goal of the invention is to improve the magnetic properties. This goal is achieved by cooling the strip during intermediate recrystallization annealing with CKOpocTbto2Of -rrO7 min. ,5 minutes.

The scheme for the preparation of an isotropic ectoptical steppe containing, by weight, is given. %: silicon 2.2-3.5} aluminum (3-0.6; carbon 0.01-0.05 sulfur 0.001-0.007 iron - the rest, soetoit on the first cold rolling at an intermediate thickness, both carbonized annealing, intermediate rvcrystallization annealing at 9 5 O-105 O C for 4-6 m with cooling at a rate of 2OO-550 C / min, a second cold rolling at final thickness with a compression of 2 & 50%, final two-step recrystallization annealing at a temperature of first stage 72OTZ c for .0.5-1.5 min and at a temperature of the second stage for 4-10 min.

The interstitial recrystallization wrench at a temperature of 95О-1О5ОС for 4-6 minutes, followed by cooling at a rate of 2OO-55O С / min, allows more complete release of nitrogen from the solid solution until the beginning of the second cold rolling and allows

In tab. 2 leads magnetic properties-p-dews at the temperature of the second steel stitch, rolled according to the described 45peni 1OOO ° C (8 min) and the temperature of the first scheme to the final thickness - 72 O, 75 O and (extract

O, 5 mm and annealed in a protective atmosphere; O, 5, 1.0 and 1.5 at each temperature;

Fere (25% Hrj and 75% NQ,) with a point).

exclude the influence of aluminum nitrides at the temperature of the first stage — the onset of recrystallization of 720–780 0 during the final two-step recrystallization – annealing.

Since, when heated to T vfnepaTypbi of the first stage, the processes of separating aluminum nitride do not affect. Selective growth of grains, the development of the orientations of y.lOj and S0} of the recrystallization pattern after cold rolling with reductions of 28-50% occurs in the sequence determined by the oriental dependence of the deformation energy. With the final two-stage recrystallization annealing of the extract at the temperature of the first stage (72O-780 ° C for 0.5-1.5 min, at the second stage temperature 95O1O2O C for 4-10, they contribute to the strengthening of the orientation and jlOO texture of recrystallization.

Table 1 shows the chemical composition of steel produced in a 1OO-electric arc furnace.

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Table 1

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Claims (2)

The comparison of the magnetic properties of the steppe, manufactured according to the known and proposed method, shows that magmitHefl inductions are almost the same in both cases, however, it is obvious that the specific losses in the steel produced by the proposed method, which is 0.13 W / kg for the first heat and 0.23 W / kg for the third. The anisotropy of magnetic induction in steel is also reduced. The invention The method of obtaining isotropic electrical steel containing, in weight. %: silicon 2.2-3.5} aluminum 0.2-0.6} carbon 0.01-0.05 sulfur O, OO1-O, OO7; zholezo - the rest, comprising cold rolling the hot rolled strip napromezhutochgguyu thickness, decarburization annealing, intermediate rekristaplizaiionny annealing at Q5O-lO50rC in T & chenie June 4 min, a second rolling to final thickness with a reduction 28-5O% final continuous two-stage rekristatshizaiionny annealing at the temperature of the second stage is 95O-1020 C for 4-10 minutes, characterized in that, in order to improve the magnetic properties, the cooling of the strip of intermediate recrystallization annealing is performed at a rate of 2OO-550C per minute, and with final continuous two-step recrystallization annealing (the step is carried out at a temperature of 72 ° -730 ° C for 0.5-1.5 minutes. Sources of information taken into account during the examination 1. Japan Patent N 48- 19O49, CL 10J 174, 1973. 2.Patent of England No. 1514375, class, from 7 liters, 1978.