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Method for smelting stainless steel mother liquor with furnace wall carbon-oxygen spray gun in arc furnace

A technology of wall carbon-oxygen spray gun and electric arc furnace, which is applied in the field of smelting chromium and nickel stainless steel mother liquor, and electric arc furnace adopts furnace wall carbon-oxygen spray gun to smelt stainless steel mother liquor. , low decarburization speed of electric arc furnace, etc., to achieve the effect of reducing smelting time and metal material consumption, saving oxygen blowing tube consumption, and reducing labor intensity of workers

Active Publication Date: 2013-11-27
PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When smelting stainless steel in an electric arc furnace, when the molten steel reaches the temperature requirement of "decarburization and chromium preservation", an artificial oxygen blowing tube is usually inserted into the molten steel for oxygen blowing decarburization when the molten steel reaches the temperature requirement of "decarburization and chromium preservation". The oxygen blowing tube needs to be replaced frequently during the process, the oxygen blowing time is long, the oxygen utilization rate is low, and the chromium oxidation is serious
[0004] There are the following main defects in the smelting of stainless steel mother liquor by the electric arc furnace of the prior art: (1) The smelting time of the electric arc furnace is long, usually more than 3 hours, which makes it difficult to match the smelting time and rhythm of the electric arc furnace and the vacuum oxygen blowing decarburization refining furnace (VOD) (2) The decarburization speed of the electric arc furnace is low, and the chromium oxidation is serious, so that the chromium yield is low and the production cost is high; (3) The manual oxygen blowing pipe is inserted into the molten steel to blow oxygen and decarburize, and the operating environment of the workers on the production site is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A method for smelting stainless steel mother liquor (smelting 12Cr13 mother liquor) by using furnace wall carbon-oxygen spray guns in an arc furnace, comprising the following steps:

[0042] The first step, batching and smelting furnace equipment:

[0043] Ingredients: The furnace charge is composed of heavy steel scrap with P<0.035% (both are mass percentages, the same below), chrome stainless steel and high-carbon ferrochrome, and the ingredients meet the requirements of C<2.0%, P<0.035%, Cr 13.0- 13.5%, and mixed with lime 20-35kg / t mother liquor, the charge is divided into two parts, and added to the smelting furnace twice;

[0044] The smelting furnace adopts a 30t eccentric bottom-tapping electric arc furnace equipped with furnace wall carbon-oxygen spray guns (that is, the JetBOxTM supersonic oxygen gun injection system of American technology company PTI); the electric arc furnace wall is equipped with 3 furnace wall carbon-oxygen spray guns, They are respective...

Embodiment 2

[0057] A method for smelting stainless steel mother liquor (smelting 20Cr13 mother liquor) using furnace wall carbon-oxygen spray guns in an electric arc furnace, comprising the following steps:

[0058] The first step, batching and smelting furnace equipment:

[0059] Ingredients: Furnace charges are composed of 20-25t of heavy scrap steel, 10-15t of chrome stainless steel return material, 7-9t of high chromium, 800-1300kg of lime is added along with the charge, and the ingredients satisfy C<2.0% (mass percentage, the same below), P <0.035%, Cr 13.50-14.0%, and lime 20-35kg / t mother liquor is mixed with the material. The charge is divided into two parts and added to the smelting furnace in two parts; the charge is loaded into the basket and hoisted into the smelting furnace by the crane;

[0060] The smelting furnace adopts a 30t eccentric bottom-tapping electric arc furnace equipped with a furnace wall carbon-oxygen spray gun, the same as in Example 1;

[0061] The second s...

Embodiment 3

[0073] A method for smelting stainless steel mother liquor (30Cr13 mother liquor smelting) by using a furnace wall carbon-oxygen spray gun in an electric arc furnace, comprising the following steps:

[0074] The first step, batching and smelting furnace equipment:

[0075] Ingredients: Furnace charges are composed of 20-25t of heavy scrap steel, 10-15t of chrome stainless steel return material, 7-9t of high chromium, 800-1300kg of lime is added along with the charge, and the ingredients satisfy C<2.0% (mass percentage, the same below), P <0.035%, Cr 13.50-14.0%, and lime 20-35kg / t mother liquor is mixed with the material. The charge is divided into two parts and added to the smelting furnace in two parts; the charge is loaded into the basket and hoisted into the smelting furnace by the crane;

[0076] The smelting furnace adopts a 30t eccentric bottom-tapping electric arc furnace equipped with a furnace wall carbon-oxygen spray gun, the same as in Example 1;

[0077] The seco...

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Abstract

The invention discloses a method for smelting stainless steel mother liquor with a furnace wall carbon-oxygen spray gun in an arc furnace. The method is characterized in that an eccentric bottom tapping arc furnace provided with the furnace wall carbon-oxygen spray gun is used; during smelting, the furnace wall carbon-oxygen spray gun is used to preheat and cut metallic charge and perform oxygen blowing and decarburization in the oxidation period; by using the furnace wall carbon-oxygen spray gun to provide chemical energy and preheat and cut scrap steel, the melting rate can be increased, the smelting time, and electrode consumption and smelting power consumption can be reduced; a burner adopts a coherent jet oxygen supply mode to blow oxygen and decarburize so that the utilization rate of oxygen is high and the oxidation quantity of chromium is low; and the smelting time and the metallic charge consumption are reduced. The method uses the furnace wall carbon-oxygen spray gun to smelt stainless steel, thus the consumption of oxygen lances can be reduced, the production cost can be significantly lowered and the labor intensity of workers can be significantly reduced.

Description

technical field [0001] The invention belongs to a method for manufacturing iron-based alloy steel products, and relates to an electric arc furnace steelmaking method, in particular to a method for smelting stainless steel mother liquor by using furnace wall carbon-oxygen spray guns in an electric arc furnace, and is mainly suitable for smelting chromium and nickel stainless steel mother liquor. Background technique [0002] In the prior art, when the electric arc furnace and the vacuum oxygen decarburization refining furnace (VOD) are used to produce stainless steel, in order to reduce the production cost, the ingredients are generally composed of high-carbon ferrochrome and heavy scrap steel returned by Benxi Steel, and the ingredients are basically carbon. Reach 2.50~3.00%. Taking a 30-ton electric arc furnace and a 25MVA transformer power as an example, the melting period of the electric arc furnace basically adopts full electric melting. The voltage is 380-436V, the cur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04
CPCY02P10/143Y02P10/20
Inventor 杨杰杨永均许勇王永新何盛
Owner PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL
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