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Highly strong, non-oriented electrical steel sheet and method for manufacture thereof

A non-directional, electromagnetic steel plate technology, applied in the direction of inorganic material magnetism, circuits, magnetic materials, etc., can solve the problems of inability to ensure strength, magnetic properties and steel plate shape, and achieve excellent magnetic properties, excellent fatigue properties, and high-strength steel plate shape and the effect of the magnetic properties

Active Publication Date: 2008-11-19
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] As described above, although some technologies have been disclosed for high-strength non-oriented electrical steel sheets, the current situation is that the required strength, good magnetic properties, and steel sheet shape cannot be ensured, and industrially stable manufacturing cannot be performed by ordinary electrical steel sheet manufacturing equipment.

Method used

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  • Highly strong, non-oriented electrical steel sheet and method for manufacture thereof
  • Highly strong, non-oriented electrical steel sheet and method for manufacture thereof
  • Highly strong, non-oriented electrical steel sheet and method for manufacture thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0154] (Embodiment 1: Inventions (1), (2))

[0155] The steel slabs with the composition shown in Table 1 were hot-rolled to a thickness of 2.5 mm, annealed at 900° C. for 60 s, and then pickled and cold-rolled to a thickness of 0.35 mm.

[0156] Here, steel G having a Ti content exceeding the range of the present invention was not subjected to subsequent treatments because scale-like folding defects often occurred after cold rolling. In addition, steel N containing almost no Ti as high as 4.3% of Si, and steel P containing Si exceeding the range of the present invention, were not subjected to subsequent treatment because the steel sheet was broken during cold rolling. Next, final annealing for a soaking time of 20 s was implemented under the conditions shown in Table 2. In addition, the tension in the furnace was measured with a tension gauge in the furnace of a tension roll type in which a load cell was incorporated in the lower part of the bearing.

[0157] Table 1

[01...

Embodiment 2

[0170] (Embodiment 2: Inventions (1), (2))

[0171] After hot-rolling the slabs of steels A and D in Table 1 to a thickness of 2.5 mm, the hot-rolled slabs were annealed at 800°C for 60 s, pickled and cold-rolled to a thickness of 0.35 mm to form coils. material. The obtained coil was subjected to final annealing in a continuous annealing furnace under the conditions shown in Table 3, and the same evaluation as in Example 1 was performed.

[0172] The results are shown in Table 3 together. It can be seen from Table 3 that steel A and D have a small improvement in the shape of the steel plate even if the tension in the furnace is high at the lower annealing temperature of 650 °C. On the other hand, when the annealing temperature was increased to 800°C and the tension in the furnace was controlled within the range of the present invention, the shape of the coil was significantly improved. By this final annealing, the conventional steel A has a large strength drop, which is no...

Embodiment 3

[0176] (Embodiment 3: Inventions (1), (2))

[0177] The steel slabs with the composition shown in Table 4 were cold-rolled to the final thickness under any one of the following conditions a to c.

[0178] a: After hot-rolling to a plate thickness of 2.0 mm, the hot-rolled plate is not annealed, and warm-rolled to a final plate thickness of 0.35 mm (steel plate temperature is 250° C.).

[0179] b: After hot-rolling to a plate thickness of 3.8 mm, no hot-rolled plate annealing is performed, cold-rolled to 1.5 mm, and then intermediate annealing at 1000° C. for 30 seconds, and then cold-rolled to a final plate thickness of 0.35 mm.

[0180] c: After hot rolling to a plate thickness of 2.5mm, after annealing of the hot rolled plate at 1050°C-holding for 30s, cold rolling to 1.0mm, and then implementing intermediate annealing at 1000°C-holding for 30s, and warm rolling to the final plate thickness of 0.20mm (Steel plate temperature is 200°C).

[0181] Next, final annealing with a...

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Abstract

Disclosed is a non-oriented electrical steel sheet having a high strength, excellent magnetic properties and excellent productivity. The steel sheet comprises 0.010% by mass or less of C and 0.010% by mass or less of N, provided that C + N = 0.010% by mass, and also comprises 1.5 to 5.0% by mass of Si and 0.8% by mass or less of Ti or a mixture of Ti and V, provided that (Ti + V) / (C + N) = 16. The steel sheet may also have a content of a non-recrystallized recovery structure of 50% or more.

Description

technical field [0001] The present invention relates to a high-strength non-oriented electrical steel sheet (high-strength non-oriented electrical steel sheet) and a manufacturing method thereof. The steel sheet of the present invention is particularly suitable for use in electromagnetic parts to which a large stress is applied, typically a rotor of a high-speed rotating machine. Here, examples of the high-speed rotating machine include turbogenerators, drive motors for electric vehicles and hybrid vehicles, robots, servomotors for machine tools, and the like. Background technique [0002] In recent years, due to the development of motor drive systems, the frequency of drive power sources can be controlled, and motors that perform variable-speed operation and motors that rotate at high speeds above a commercial frequency are increasing. In a motor accompanied by such high-speed rotation, the centrifugal force acting on the rotor is proportional to the radius of rotation and...

Claims

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Application Information

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IPC IPC(8): C22C38/00C22C38/14C22C38/60B21B3/02C21D8/12H01F1/16
CPCC21D8/12C22C38/001C22C38/02C22C38/04C22C38/06C22C38/14H01F1/14791H01F1/16
Inventor 河野雅昭尾田善彦大久保智幸
Owner JFE STEEL CORP
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