Smelting method of grain oriented silicon steel alloyed in rh furnace

A technology of grain-oriented silicon steel and smelting method, which is applied in the smelting field of grain-oriented silicon steel to achieve the effects of stable alloy yield, reduction of alloy oxidation loss, and reduction of fine-tuning times.

Active Publication Date: 2017-12-29
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This document can effectively reduce the harmful residual elements Nb, V, Ti in molten steel and improve the cleanliness of molten steel. However, since there is no aluminum in the steel, there is still a part of free oxygen in molten steel after vacuum refining.

Method used

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  • Smelting method of grain oriented silicon steel alloyed in rh furnace
  • Smelting method of grain oriented silicon steel alloyed in rh furnace
  • Smelting method of grain oriented silicon steel alloyed in rh furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1 (for general grain-oriented silicon steel)

[0025] 1) Carry out converter smelting and tapping, and the tapping temperature is controlled at 1680-1688°C;

[0026] 2) A slag stopper is used to stop the slag at the end of the converter tapping, and the thickness of the slag layer on the surface of the molten steel after the steel tapping is measured is 37mm;

[0027] 3) RH refining: After 3 minutes of decarburization, according to the oxygen content in molten steel, add aluminum shot and bauxite for deoxidation and slagging, the amount of aluminum added is 7 times the weight percentage of oxygen, and the calculated addition The amount is 0.437kg / t, and bauxite is added according to the amount of 1.0kg / t; after the addition of aluminum pellets and bauxite, it circulates for 2 minutes, and then carries out alloying according to the designed amount of addition until it reaches the set value of the composition;

[0028] 4) Casting into a billet and performing subs...

Embodiment 2

[0031] Example 2 (for general grain-oriented silicon steel)

[0032] 1) Carry out converter smelting and tapping, and the tapping temperature is controlled at 1665-1670°C;

[0033] 2) A slag stopper is used to stop the slag at the end of the converter tapping, and the thickness of the slag layer on the surface of the molten steel is measured to be 42mm after the tapping is completed;

[0034] 3) RH refining: after decarburization for 5 minutes, according to the oxygen content in molten steel, add aluminum shot and bauxite for deoxidation and slagging, the amount of aluminum added is 7 times the weight percentage of oxygen, and the calculated addition The amount is 0.385kg / t, and the bauxite is added according to the amount of 1.15kg / t; after the aluminum shot and bauxite are added, the cycle is 2.5min, and then the alloying is carried out according to the designed addition amount until the composition setting value is reached;

[0035] 4) Casting into a billet and performing ...

Embodiment 3

[0038] Example 3 (high temperature and high magnetic induction grain-oriented silicon steel, namely Hi-B)

[0039]1) Carry out converter smelting and tapping, and the tapping temperature is controlled at 1670-1675°C;

[0040] 2) A slag stopper is used to stop the slag at the end of the converter tapping, and the thickness of the slag layer on the surface of the molten steel is measured to be 35mm after the tapping is completed;

[0041] 3) RH refining: After 3.5 minutes of circulating decarburization, according to the oxygen content in molten steel, add aluminum shot and bauxite for deoxidation and slagging, the amount of aluminum added is 8 times the weight percentage of oxygen, and the calculation The addition amount is 0.256kg / t, and the bauxite is added according to the amount of 1.05kg / t; after the addition of aluminum pellets and bauxite, it circulates for 3 minutes, and then carries out alloying according to the designed addition amount until the composition setting val...

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Abstract

The invention provides a method for smelting alloyed oriented silicon steel in a RH furnace. The method includes the steps that converter smelting and tapping are conducted, slag is blocked when converter tapping is finished, and RH refining is conducted; after circulating decarburization is conducted for 3 minutes to 5 minutes, aluminum balls and bauxite are added for deoxidization and slag formation, and when the aluminum balls and the bauxite stop being added, circulation is further conducted for 2 minutes to 3 minutes, and alloying is conducted; and casting is conducted, blanks are formed, and later working procedures are conducted. According to the method, on the one hand, due to the fact that RH refining is conducted, alloying is conducted after residual carbon in molten steel is deoxidized, the number of generated oxide inclusions can be reduced, the total oxygen content in the steel is kept below 15 ppm, the alloy oxidation loss is reduced as well, and the contents of harmful elements such as Nb, V and Ti remaining in the steel are all kept below 20 ppm, and magnetic performance is excellent. Furthermore, due to the fact that decarburization can be conducted in the RH furnace, no converter low-carbon high-oxygen tapping is needed, and corrosion to a converter lining caused by oxygen blast can be relieved remarkably.

Description

technical field [0001] The invention relates to a method for smelting oriented silicon steel, in particular to a method for smelting oriented silicon steel alloyed in a RH furnace. Background technique [0002] Oriented silicon steel is mainly used to manufacture various power transformers, distribution transformers and large generator stators. It is an indispensable energy-saving and consumption-reducing magnetic material in the electric power, electrician, and telecommunications industries. According to the characteristics of the manufacturing process and magnetic properties, it is divided into two types: CGO and Hi-B. Generally, the CGO orientation degree of oriented silicon steel is 85% to 90%, and the average deviation angle of <001> is about 7°; the Hi-B orientation degree of high magnetic induction oriented silicon steel is as high as 95%, the average deviation angle of <001> is about 3°. [0003] At present, the output of domestic grain-oriented silicon ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/10C21C7/06C21C7/068C22C33/04
CPCC21C7/0006C21C7/06C21C7/068C21C7/10C22C33/04
Inventor 申明辉黎世德骆忠汉杨佳欣李准郭小龙
Owner 武汉钢铁有限公司
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