Technological process for controlling secondary recrystallization crystal particle dimension of oriented silicon steel
A technology of secondary recrystallization and grain size, applied in the field of metallurgy, can solve the problems of limited magnetic improvement effect, high cost of stress coating, poor high temperature stability, etc., to achieve the effect of easy operation, simple process, and refinement of magnetic domains
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Embodiment 1
[0044] The steel is made in a 500kg vacuum furnace, and the chemical composition and hot rolling conditions are shown in Table 1 and Table 2. Normalized condition 1150℃×5s+930℃×70s+50℃ / s cooling, strip cold rolling to 0.30mm, 850℃ nitriding, nitriding about 100ppm, decarburization, pickling with 5% HCl for about 30sec Cleaning (cleaning and coating process such as figure 1 shown).
[0045] Such as image 3 , Figure 4 , Figure 5 , Image 6 , Figure 7 As shown, the shape of the convex coating roller can be selected from strip, wave, square, dot matrix or circle. Such as image 3 with Figure 4 As shown, the wave-shaped convex coating roller f and the strip-shaped convex coating roller a are selected for cross test, the convex width of the coating roller is 1m, and the coating thickness is 1m. Aluminum paste roller coating equipment such as figure 2 As shown, 1 is strip steel, 2 and 8 are grooved rolls, 3 and 9 are aluminum slurry tanks, 4 and 7 are pressure rolls, ...
Embodiment 2
[0053] Use A component in Table 1 and the hot-rolled condition steel plate in Table 2 to carry out the aluminum coating condition experiment after cold rolling (reduction rate 88%). The coating temperature is below 10 degrees. The influence of coating thickness is shown in Table 4, and the relationship between coating thickness and magnetic properties is shown in Table 5.
[0054] Table 4 The relationship between coating solution concentration and coating thickness
[0055] (1 to 7 are single coating, 8 is 3 repeated coatings)
[0056]
serial number Coating concentration
% Coating thickness
μm coating roller
shape Protrusion Width
μm
Grid distance mm
illustrate 1
0
0
comparative example
[0057] 2
10
0.2
a
0.1
30
Invention example
3
20
1
a
0.1
25
Invention example
4
30
5
a
0.5
25
Invention example
5
50
40
a
20
2...
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