NL8000343A - METHOD FOR MANUFACTURING A STEEL SHEET WITH GOSS TEXTURE - Google Patents

Description

N. O. 28671 1

* V

Method for the production of a steel plate with Goss texture.

The invention relates to a process for the production of a steel plate with a Goss texture, namely a method for the production of such a plate with a thickness of at most 0.2 mm with 2.5 to 4% by weight of Si, at most 0.02 wt.% by 5 cold rolling, a cold rolling heating process to achieve the primary crystallization and a final annealing process to achieve a tertiary recrystallization

Such a method is known from German Offenle-gungsschrift 1 921 658. According to this method, a hot-rolled steel plate with at most 0.085 wt.% C, 0 to 4 wt.% Si, 0.003 to 0.1 wt. S and 0.01 to 0.065% by weight of an acid-soluble aluminum are annealed at a temperature to form aluminum nitride from the acid-soluble aluminum and nitrogen from the melt or from the air and into the plate in a desired size for reaching secondary recrystallization with the desired grain orientation is separated, then several times in succession, first with a decrease of 5 to 40%, then cold-rolled with a decrease of 70 to 95% to a final thickness of 0.05 to 0 .35 mm, the plate being heated to a temperature between 750 and 1200 ° C between these rolling processes and subjected to final annealing at a temperature of 1200 ° C after the last cold rolling process. In addition to the aforementioned formation of aluminum nitride, the sulfur content is considered of great importance in this process for the desired grain orientation. Furthermore, a process for the production of silicon plate with Goss texture is known, wherein a silicon plate is cold-rolled successively in a number of stages and the final annealing process is carried out in two recrystallization stages, the first stage of which is carried out in the presence of sulfur or selenium ( German "Auslegeschrift" 508.363) ·

The present invention was based on the problem of providing a simpler and cheaper process for producing Goss-textured silicon plates efficiently, with the requirements for the absence of metallic or non-metallic alloy components which do not positive influences on quality do not exceed those of common steels.

According to the invention, this problem is solved in that in a process for the production of a steel plate which is at most 0.2 mm thick, possibly thus a steel foil, with 2.5 to 4% by weight Si, at most 0.02. % C and with Goss texture by cold rolling a heating process performed after the 8000343 2 'ft j · c cold rolling to achieve the primary crystallization and a subsequent final annealing process to achieve a tertiary recrystallization the cold rolling process with a reduction in thickness from 40 to 85% is carried out, the temperature of the mentioned heating process is between 700 and 900 ° C and the temperature of the mentioned final annealing process is at 1300 ° C to 1500 ° C.

The mentioned cold rolling and heating process steps can be repeated once or several times for the final annealing process.

The final annealing process is preferably carried out under reduced pressure, such that the plate is uniformly brought to the maximum temperature between 1300 and 1500 ° C in a number of hours and then kept at this temperature for a number of hours.

Preferably, the starting material contains aluminum, namely up to 3% by weight.

In principle, a plate with any texture can be used as the starting material; the plate may contain non-metallic admixtures of up to 0.15 wt% and up to 4 wt% of additional metals of the kinds used in silicon plates as an alloy component. Example I.

A secondary crystallized 0.25 mm thick steel plate with Goss texture and the following composition; 0.017 wt $ C, 2.87 wt $ Si, 0.08 wt $ Mn, 0.012 wt $ P, 0.009 wt $ S, 0.0016 wt $ N, 0.005 wt $ Al, 0 0.01 wt. $ Ti. 0.0068 wt. $ 0 was cold rolled with a degree of deformation of 60% to a thickness of 0.1 mm, then brought to a temperature of 900 ° C in a salt bath for 1 to 3 minutes. temperature, then brought from this temperature to 1350®C with a temperature increase of 100®C / hour and then held at this temperature for 1 hour.

Example II.

A cold-rolled, 0.50 mm thick strip with the following composition 0.01 wt. $ C, 3.35 wt. $ Si, 0.12 wt. $ Mn, 0.011 wt. $ P, 0.006 35 wt. $ S 0.0026 wt $ N, 0.89 wt $ Al, 0.01 wt $ Ti, 0.02 wt $ V, 0.021 wt $ 0 were cold-rolled at 60%, a subsequent primary recrystallization in a salt bath at 800®C in a time of 90 seconds, repetition of cold rolling at 60%, a subsequent primary recrystallization in the salt bath at 800®C in a time of 30 seconds and further cold rolling at 60% on a thickness of 30 \ m brought. For the adjustment of the Goss texture by tertiary winch crystallization, this 8000343 3 f foil is then brought to a temperature of 900 ° C under reduced pressure for a short time under reduced pressure and then slowly brought to a temperature of 1350 ° C with an increase in temperature of 100 ° C / hour and at this temperature for 30 minutes. kept.

8000343

Claims (5)

1. A process for the production of a steel plate or film of no more than 0.2 mm thick with 2.5 to 4% by weight of Si, not more than 0.02% by weight of C and with Goss texture by cold rolling, one after cold rolling carried out heating process for achieving the primary crystallization and a subsequent final annealing process for achieving a tertiary recrystallization, characterized in that the cold rolling is carried out with a decrease in thickness of 40 to 85%, the temperature of the mentioned heating mixing process between 700 * and 900 * C and the temperature of the stated final annealing process at 1300 * to 1500 ° C. 2. Process according to claim 1, characterized in that the said process steps of heating and cold rolling are repeated once or several times. Process according to claim 1 or 2, characterized in that the final annealing process is carried out under reduced pressure and the plate 15 is gradually brought to the final temperature over a number of hours and the plate is then kept at this temperature for at least one hour. . 4. Process according to claim 3, characterized in that in the final annealing process the plate is first heated at about 900 ° C and then at a rate of 100 ° C / hour at a temperature between 1300 * and 1500 ° C and the plate at this temperature for 0.5 to several hours. Method according to claims 1-4, characterized in that the starting material contains at most 3% by weight of Al. 8000343