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Non-oriented electrical steel with high magnetic induction and manufacturing method thereof

A technology of grain-oriented electrical steel and a manufacturing method, which is applied in the manufacturing field of high-grade non-oriented electrical steel to achieve the effects of improving thickness accuracy, improving production efficiency and improving quality level.

Active Publication Date: 2014-10-01
MAGANG (GROUP) HOLDING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This is out of sync with the needs of the current motor industry and poses new challenges to the original manufacturing methods

Method used

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  • Non-oriented electrical steel with high magnetic induction and manufacturing method thereof
  • Non-oriented electrical steel with high magnetic induction and manufacturing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] The chemical composition of molten steel is shown in Table 1. Prepare according to the process route of molten iron pretreatment → converter smelting → RH refining → thin slab continuous casting and rolling. The temperature is 680° C., and the thickness of the hot-rolled sheet is 2.5 mm.

[0033] Table 1 embodiment chemical composition (wt%)

[0034] serial number C Si mn P S Al N Fe 1 0.0040 2.85 0.25 0.0080 0.0026 0.35 0.0015 margin 2 0.0038 1.85 0.30 0.015 0.0021 0.30 0.0016 margin

[0035] The hot-rolled sheets with different components were normalized according to the normalization process shown in Table 2, then cold-rolled to 0.50mm, and finished annealed. The obtained samples were made into 30×320mm square ring samples for magnetic property measurement. Among the serial numbers X-Y, X is the serial number of the different chemical components of the embodiment, and Y is the serial number of the normalization proc...

Embodiment 2

[0039] The chemical composition of molten steel is shown in Table 1. Prepare according to the molten iron pretreatment→converter smelting→RH refining→hot continuous rolling process route. The thickness of the continuous casting slab is 230mm, the temperature of the soaking furnace is 1130℃, hot rolling after soaking, cooling and coiling after hot rolling, and the coiling temperature is 690 ℃, the thickness of the hot-rolled sheet is 2.2 mm.

[0040] Table 3 Example Chemical Composition (wt%)

[0041] serial number C Si mn P S Al N Fe 1 0.0060 2.15 0.30 0.0080 0.0045 0.31 0.0035 margin

[0042] The hot-rolled sheets of different compositions are normalized according to the normalization process shown in Table 2. Serial number 1-1 is an inventive example, and serial number 1-2 is a comparative example, then cold-rolled to 0.35 mm, and finished annealed. Form a 30×320mm square sample to measure the magnetic properties. It can be seen that t...

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Abstract

The invention relates to non-oriented electrical steel with high magnetic induction and a manufacturing method of the steel. According to the manufacturing method of the steel, high-quality board raw materials are provided for the subsequent processes by controlling heating speed of a normalizing and heating stage, controlling a speed of a normalizing and cooling stage and using cooperation of proper blasting and pickling processes. The magnetic induction B50 of the manufactured non-oriented electrical steel is increased by 200-500 gausses, and the quality level of the iron loss material object is increased by 3-5% under the conditions that additional alloy elements are not added and the annealing process of the finished product is not changed; and the magnetic property of the manufactured non-oriented electrical steel is further improved by optimizing the annealing process, so that the magnetic induction is further improved. The manufactured non-oriented electrical steel can meet the requirements of normal motors and also can meet the requirement of high magnetic induction of electrical steel applied to iron cores of efficient motors and frequency-variable motors; the efficiency of the motors can be improved; and the energy consumption and the noise of the manufactured non-oriented electrical steel can be reduced.

Description

technical field [0001] The invention relates to a non-oriented electrical steel and a manufacturing method thereof, and mainly relates to a manufacturing method of a high-grade non-oriented electrical steel with high magnetic induction for producing high-efficiency and ultra-high-efficiency motors. Background technique [0002] Non-oriented electrical steel with low iron loss and high magnetic induction is an important part of functional materials. Because of its excellent characteristics such as low iron loss, high magnetic permeability, and small magnetostriction, it has become a large and medium-sized hydraulic, thermal, and wind power generator. The main material in the field of equipment core manufacturing. In recent years, with the requirements of environmental protection and motor efficiency standards getting higher and higher, the demand for electrical steel with low iron loss and high magnetic induction as the core material of motors has become more and more intense...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C21D8/12
Inventor 王立涛裴英豪施立发裴陈新董梅何峰丰慧
Owner MAGANG (GROUP) HOLDING CO LTD
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