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Smelting method and production technology of electrical steel

A technology of smelting method and production process, which is applied in the field of smelting method and production process of electrical steel, can solve problems such as poor cleanliness, achieve the effects of reducing the generation of inclusions, improving the purification effect, and promoting growth

Inactive Publication Date: 2017-09-29
MAANSHAN HUASHENG METALLURGICAL SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the problem of poor cleanliness in existing electrical smelting in the prior art, and provide a smelting method and production process for electrical steel;

Method used

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  • Smelting method and production technology of electrical steel
  • Smelting method and production technology of electrical steel
  • Smelting method and production technology of electrical steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Such as Figure 5 As shown, a kind of electrical steel smelting method of the present embodiment, concrete steps are as follows:

[0046] S100, molten iron pretreatment

[0047] Control the slag removal rate ≥ 95%, control S ≤ 0.003% during molten iron pretreatment, and control the temperature of molten iron ≥ 1350°C before desiliconization; the slag removal rate in this embodiment is 96%, control S: 0.003% during pretreatment of molten iron, desiliconization The temperature of the former molten iron is 1360°C;

[0048] S200, converter smelting

[0049] The temperature of the molten iron entering the furnace is ≥1250°C. In this example, it is 1280°C. Scrap steel with low sulfur and low phosphorus content is used, S≤0.003%, P≤0.02%, and the ratio of scrap steel into the furnace is ≤10%. 9%. During the whole process of smelting, argon or nitrogen gas is blown at a low level. In this example, argon gas is used, and a deoxidizer is added for deoxidation. The molten stee...

Embodiment 2

[0075] The basic content of this embodiment is the same as that of Example 1, except that the cleaning agent is in the form of granules, the cleaning agent is in the form of spherical particles, and the diameter of the particles is 5-10mm; the cleaning agent includes effective components and bonding components, and the effective components The mass ratio to the adhesive component is (5-10):1, preferably 5:1 in this embodiment.

[0076] The effective components in the purification agent of this embodiment also include graphite powder, red jade soil and magnesium-manganese alloy; the effective components are composed according to the following mass parts, 50-70 parts of metal aluminum, 20-40 parts of lime powder, and 0-30 parts of graphite powder part, 5-20 parts of titanium dioxide, 5-15 parts of silicon carbide powder, 2-4 parts of biomass, 0-1 part of red jade soil, 0-2 part of magnesium-manganese alloy; the present embodiment is 50 kg of metal aluminum, 20 kg of lime powder, ...

Embodiment 3

[0080] The basic content of this embodiment is the same as that of Example 1, except that the adhesive component of the purifying agent also includes starch and kaolin, and the adhesive component is composed of the following parts by mass: 60-80 parts of kaolin, 20-40 parts of sulfonated phenolic resin parts, starch 0-10 parts, oil sands 0-5 parts. This embodiment is composed according to the following mass: 80 kg of kaolin, 40 kg of sulfonated phenolic resin, 5 kg of starch, 2 kg of oil sand, and the test results of the steel sample are basically the same as in embodiment 1. The starch and oil sand in the bonding component play the role of bonding in the early stage, and in the later stage, they will participate in the deoxidation reaction in molten steel and generate gas, thereby promoting the floating of inclusions and improving the deoxidation efficiency at the same time.

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Abstract

The invention discloses a smelting method and a production technology of electrical steel and belongs to the technical field of pure steel smelting. After molten steel is smelted in a converter, the molten steel is conveyed to be subjected to the RH refining technology, and the flow of circulation gas ranges from 100 Nm<3> / h to 300 Nm<3> / h; and a purifying agent is added in the molten steel in the RH refining tail stage, and the target components of the electrical steel are controlled, wherein C is controlled to be smaller than or equal to 0.003%, Si is controlled to range from 0.7% to 1.0%, Mn is controlled to range from 0.2% to 0.3%, P is controlled to be smaller than or equal to 0.03% and S is controlled to be smaller than or equal to 0.005%. The purifying agent includes effective components and adhesive components, wherein the mass ratio of the effective components to the adhesive components is (5-10):1. By means of the smelting method and the production technology of the electrical steel, due to molten iron pretreatment, converter smelting and the RH refining technology and due to the fact that the purifying agent is added into the molten steel, the size of residual inclusions in the molten steel is small, the residual inclusions are evenly distributed, the residual inclusions are basically subjected to denaturating treatment, the purifying effect of the molten steel is improved, and the electrical steel cleanliness is improved.

Description

technical field [0001] The invention belongs to the technical field of clean steel smelting, and more specifically relates to a method for smelting electrical steel and a production process thereof. Background technique [0002] With the development of society and the continuous improvement of human needs, people have put forward higher requirements for steel materials. Taking electrical steel as an example, electrical steel is an indispensable and important soft magnetic alloy for power, electronics and military industries, and it is also the largest output. Metal functional materials are mainly used as iron cores of various motors, generators and transformers. [0003] The "new generation of steel material" is characterized by ultra-fine grain, high cleanliness and high uniformity (high homogeneity), and its research and development goal is to basically not increase the manufacturing cost, use less alloy resources and energy, and basically not reduce plasticity and toughne...

Claims

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Application Information

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IPC IPC(8): C21C7/10C21C7/04C21C7/06C21C7/068
CPCC21C7/04C21C7/06C21C7/068C21C7/10Y02P10/20
Inventor 王海军从俊强凌海涛杨建刘桂成
Owner MAANSHAN HUASHENG METALLURGICAL SCI & TECH DEV
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