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Rolling preparation method for high-silicon electrical steel thin strip

A high-silicon electrical steel and thin strip technology, applied in metal rolling and other directions, can solve the problems of reducing the cold-rolling processability of high-silicon electrical steel, reduce subsequent cold-rolling edge cracks, eliminate residual stress, and reduce the degree of order. Effect

Active Publication Date: 2016-05-25
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if the annealing conditions are not suitable, it is likely to lead to the recovery of the ordered structure of the low-order strip obtained by warm rolling deformation, thereby reducing the subsequent cold-rolled processing performance of high-silicon electrical steel

Method used

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  • Rolling preparation method for high-silicon electrical steel thin strip

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Effect test

Embodiment 1

[0030] Such as figure 1 Shown, a rolling preparation method of high-silicon electrical steel thin strip, the method first uses the high-silicon electrical steel slab heated with the furnace as raw material to prepare a high-silicon electrical steel slab, and then the high-silicon electrical steel slab is prepared The electrical steel slab is gradually cooled and rolled to obtain a high-silicon electrical steel warm-rolled strip, and the high-silicon electrical steel warm-rolled strip is subjected to low-temperature annealing and cold rolling to prepare a high-silicon electrical steel thin strip; the prepared obtained The thickness of the high-silicon electrical steel thin strip is 0.1-0.5mm; the high-silicon electrical steel cast slab includes the following components in weight percentage: silicon 4.5-6.8wt%, boron 0.001-0.05wt%, and the balance is iron and unavoidable impurity elements.

[0031] Gradually lowering the temperature of the high-silicon electrical steel slab to ...

Embodiment 2

[0042] A high-silicon electrical steel ingot with a silicon content of 6.8 wt% (mass percentage), a B content of 0.02 wt% (mass percentage), and iron and unavoidable impurity elements as the balance was prepared by vacuum induction melting. The raw materials are: industrial pure iron with an iron content of 99.65 wt% (mass percentage), metal silicon with a purity of 99.95 wt% (mass percentage), and ferroboron with a B content of 20 wt% (mass percentage). Melting adopts intermediate frequency vacuum induction furnace, pouring high-silicon electrical steel billets weighing 21-25kg. The high-silicon electrical steel slab was heated to 1200°C with the furnace and then forged. The final forging temperature was 900°C to obtain a high-silicon electrical steel slab with a thickness of 20mm.

[0043] After heating the high-silicon electrical steel slab to 700°C, roll it for 3 passes with a deformation of 30% until the thickness of the slab is about 7mm, and heat the slab back to 700°C ...

Embodiment 3

[0047] A high-silicon electrical steel ingot with a silicon content of 6.5wt% (mass percent), a B content of 0.02wt% (mass percent), and iron and unavoidable impurity elements as the balance was prepared by vacuum induction melting. The raw materials are: industrial pure iron with an iron content of 99.65 wt% (mass percentage), metal silicon with a purity of 99.95 wt% (mass percentage), and ferroboron with a B content of 20 wt% (mass percentage). Melting adopts intermediate frequency vacuum induction furnace, pouring high-silicon electrical steel billets weighing 21-25kg. The high-silicon electrical steel slab was heated to 1100° C. with the furnace and then hot-rolled to obtain a high-silicon electrical steel slab with a thickness of 5 mm.

[0048] The hot-rolled high-silicon electrical steel slab is pickled to remove the surface oxide layer. The pickling condition is to immerse in 10-20% hydrochloric acid for 5-10 minutes, then brush to remove the surface oxide layer, and ri...

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Abstract

The invention mainly belongs to the field of metal material preparation and machining and particularly relates to a rolling preparation method for a high-silicon electrical steel thin strip. The method comprises the steps of firstly, taking a high-silicon electrical steel casting blank heated in a furnace as the raw material, so that a high-silicon electrical steel plate slab is prepared and obtained, then conducting warm rolling on the high-silicon electrical steel plate slab in a stepwise-cooling mode, so that a high-silicon electrical steel warm-rolled strip is obtained, and conducting low temperature annealing and cold rolling on the high-silicon electrical steel warm-rolled strip, so that the high-silicon electrical steel thin strip is prepared and obtained. According to the rolling preparation method for the high-silicon electrical steel thin strip, warm rolling in a stepwise-cooling mode is adopted, the accumulated maximum warm rolling deflection is not influenced, meanwhile, the rolling temperature can be lowered, and a better toughening and plasticizing effect is obtained; after warm rolling is completed, annealing is conducted in the proper condition, residual tension of sides of the high-silicon electrical steel warm-rolled strip is effectively lowered, meanwhile, restoration of the ordered structure is avoided, and the cold rolling yield is raised.

Description

technical field [0001] The invention mainly belongs to the field of metal material preparation and processing, and in particular relates to a rolling preparation method of a high-silicon electrical steel thin strip. Background technique [0002] Fe-Si alloy, also known as electrical steel, is widely used in the manufacture of iron cores or rotors for generators, motors, transformers, and instruments. It is an important soft magnetic material in the fields of electric power, telecommunications, military industry, and vehicle engineering. [0003] With the increase of Si content, the soft magnetic performance of electrical steel improves, and the high-silicon electrical steel with Si content of 6.5wt% has almost zero saturation magnetostriction coefficient, the highest maximum magnetic permeability, and greatly reduced magnetic loss. soft magnetic properties. However, as the silicon content increases, the room temperature brittleness of electrical steel increases. When the Si...

Claims

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Application Information

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IPC IPC(8): B21B1/22C21D8/12
CPCB21B1/22C21D8/1227C21D8/1233C21D8/1244
Inventor 张志豪莫远科谢建新潘洪江
Owner UNIV OF SCI & TECH BEIJING
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