Method for producing grain oriented pure iron through secondary annealing

A technology of secondary annealing and grain orientation, used in heat treatment equipment, heat treatment process control, manufacturing tools, etc., can solve problems such as poor purification effect, and achieve the effect of improving magnetic induction intensity and increasing annealing time

Active Publication Date: 2019-04-09
ANHUI UNIVERSITY OF TECHNOLOGY +1
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  • Abstract
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiency of poor purification effect in the high-temperature annealing stage in the production method of grain-oriented pure iron in the prior art, and provides a method for producing grain-oriented pure iron by secondary annealing, which can achieve good Purification effect, and by cooperating with other process steps, the magnetic induction intensity of grain-oriented pure iron can be improved

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  • Method for producing grain oriented pure iron through secondary annealing
  • Method for producing grain oriented pure iron through secondary annealing
  • Method for producing grain oriented pure iron through secondary annealing

Examples

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Embodiment 1

[0046] combine figure 2 As shown, in this embodiment, the chemical composition mass percentage of grain-oriented pure iron is: C=0.04%, Si=0.10%, Mn=0.10%, S=0.005%, Als=0.015%, N=0.007%, The rest are unavoidable impurities and Fe. The specific production steps are as follows:

[0047] 1) Converter smelting: The tapping temperature of the converter is 1600°C. Then, the converter smelting molten steel is refined by using the molten steel vacuum circulation degassing method, and the composition of the molten steel is adjusted after refining to obtain the refined molten steel. Among them, the refining start temperature is 1590°C, and the refining end temperature is 1545°C;

[0048] 2) Continuous casting: Protective casting of molten steel by blowing argon through long nozzles to obtain continuous casting slabs; wherein the cooling method of natural cooling is adopted for die casting. It is worth noting that the thickness of the slab is 155mm.

[0049] 3) Soaking: put the sl...

Embodiment 2

[0062] The content of this embodiment is basically the same as that of Example 1. The difference is that the content of this embodiment is basically the same as that of Example 1. The difference is that the mass percentage of the chemical composition of grain-oriented pure iron in this embodiment is: C= 0.02%, Si=0.10%, Mn=0.10%, S=0.005%, Als=0.007%, N=0.007%, and the rest are unavoidable impurities and Fe. The process parameters of production are the same as in Example 1, and the magnetic properties of the obtained grain-oriented pure iron are measured, and the result is: B 800 =1.928T,B 10000 =2.125T.

[0063] It can be seen from the above examples and comparative examples that the magnetic induction of grain-oriented pure iron is further improved by performing secondary annealing on the slab and by cooperating with other process steps. It should be noted that only when the high temperature purification section temperature T 高净 The best effect can be achieved when the te...

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Abstract

The invention discloses a method for producing grain oriented pure iron through secondary annealing, and belongs to the technical field of electrotechnical soft magnetic materials. According to the method for producing the grain oriented pure iron through secondary annealing, a plate blank is subjected to secondary annealing treatment which includes a heating section, a high-temperature purifyingsection and a cooling section; and mixed gas composed of hydrogen and nitrogen serves as protective gas of the heating section, and the volume ratio of the hydrogen to the nitrogen in the mixed gas is3:1; and hydrogen serves as protective gas in the high-temperature purifying section. The temperature T<high net > of the high-temperature purifying section is 880-900 DEG C, the magnetic induction intensity B<800> of the oriented pure iron produced through secondary annealing is larger than 1.90T, and B<10000> is 2.12-2.15T. The method aims to overcome the defect that in the prior art, the high-temperature purifying section in a grain oriented pure iron producing method is poor in purifying effect, the method for producing the grain oriented pure iron through secondary annealing is providedand can achieve the good purifying effect, and by means of other technology steps, the magnetic induction intensity of the grain oriented pure iron can be improved.

Description

technical field [0001] The invention relates to the field of electrical soft magnetic materials, and more specifically relates to a method for producing grain-oriented pure iron by secondary annealing. Background technique [0002] Soft magnetic materials refer to when the magnetization occurs at Hc not greater than 1000A / m, such materials are called soft magnets. Typical soft magnetic materials can achieve maximum magnetization with minimum external magnetic field. Soft magnetic material is a magnetic material with low coercive force and high magnetic permeability. Soft magnetic materials are easy to magnetize and demagnetize, and are widely used in electrical and electronic equipment. The most widely used soft magnetic materials are iron-silicon alloys (silicon steel sheets) and various soft ferrites. [0003] Grain-oriented pure iron is a soft magnetic product with performance characteristics between electrical pure iron and oriented silicon steel. Through the combinat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/26C21D1/76C21D11/00C22C38/06C22C38/04C22C38/02
CPCC21D1/26C21D1/76C21D11/00C21D2201/05C22C38/001C22C38/02C22C38/04C22C38/06
Inventor 王海军仇圣桃荣哲项利付兵赵芃
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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