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Austenitic stainless steel refining method

A technology of austenitic stainless steel and molten steel, which is applied in the field of stainless steel refining, can solve the problems of low production efficiency, high production cost, and high process energy consumption, and achieve the effects of increasing service life, reducing ferrosilicon consumption, and reducing process energy consumption

Active Publication Date: 2019-01-29
湖州盛特隆金属制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional stainless steel cannot meet the requirements of cutting-edge fields. Due to the excellent comprehensive performance of austenitic stainless steel, such as ultra-low carbon stainless steel and super duplex steel, there is an increasing demand for austenitic stainless steel products that can meet special requirements in the market. Big
However, there are a series of problems in the production of austenitic stainless steel, such as long smelting time, low production efficiency, high process energy consumption and high production cost.
Therefore, the existing refining method of austenitic stainless steel has the problems of long smelting time, low production efficiency, high process energy consumption and high production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The process adopts EAF electric arc furnace + AOD refining dual process.

[0027] The 316L steel produced contains the following components by weight per 100 parts: Cr: 16.5-16.8 parts, Ni: 10.02-10.1 parts, Mo: 2.02-2.08 parts, C: 0.012-0.028 parts, P: 0.025- 0.045 parts, S: 0.001-0.03 parts, Si: 0.01-0.8 parts, Mn: 0.1-1.2 parts, and the rest are Fe and unavoidable impurities.

[0028] Since AOD stainless steel refining cannot remove P, the P content of steelmaking raw materials is strictly controlled.

[0029] a. Melting steel: put scrap steel into EAF electric arc furnace in three batches as steelmaking raw material, add 40% steelmaking raw material in the first batch, wait for the temperature of molten steel in EAF electric arc furnace to reach 1600 ℃, then add 20% of the second batch Steel-making raw materials, when the temperature of molten steel in the EAF electric arc furnace reaches 1600°C, add 40% steel-making raw materials in the third batch; spray a mixtur...

Embodiment 2

[0037] The process adopts EAF electric arc furnace + AOD refining dual process.

[0038] The 316L steel produced contains the following components by weight per 100 parts: Cr: 16.5-16.8 parts, Ni: 10.02-10.1 parts, Mo: 2.02-2.08 parts, C: 0.012-0.028 parts, P: 0.025- 0.045 parts, S: 0.001-0.03 parts, Si: 0.01-0.8 parts, Mn: 0.1-1.2 parts, and the rest are Fe and unavoidable impurities.

[0039] a. Steel melting: use scrap steel as raw material for steelmaking, add it to EAF electric arc furnace in four batches, add 40%, 20%, 20% and 20% of steelmaking raw material in each batch, and the temperature of molten steel reaches 1600 before each feeding. ℃; spray a mixture of 60% carbon powder and 40% aluminum powder from the furnace door, and melt the steelmaking raw materials into molten steel to obtain product A;

[0040] b. Ingredients: add 350KG lime, 230KG carbon balls and 300KG ferrosilicon to product A, take a sample of molten steel for spectral analysis, adjust the composit...

Embodiment 3

[0047] The process adopts EAF electric arc furnace + AOD refining dual process.

[0048] The 304L steel produced contains the following components by weight per 100 parts: Cr: 18.5-19.5 parts, Ni: 8.05-11.8 parts, C: 0.012-0.032 parts, P: 0.025-0.045 parts, S: 0.002- 0.03 parts, Si: 0.1-0.8 parts, Mn: 0.3-1.6 parts, and the rest are Fe and unavoidable impurities.

[0049] a. Steel melting: use scrap steel as raw material for steelmaking, add it to EAF electric arc furnace in four batches, add 40%, 20%, 20% and 20% of steelmaking raw material in each batch, and the temperature of molten steel reaches 1600 before each feeding. ℃; spray a mixture of 60% carbon powder and 40% aluminum powder from the furnace door, and melt the steelmaking raw materials into molten steel to obtain product A;

[0050] b. Ingredients: add 330KG lime, 220KG carbon balls and 280KG ferrosilicon to product A, take a sample of molten steel for spectral analysis, adjust the composition according to the an...

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PUM

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Abstract

The invention discloses an austenitic stainless steel refining method. The method comprises the following steps that steelmaking raw materials are added in an EAF firstly, the carbon powder and aluminum powder mixture is sprayed, the steelmaking raw materials are melted into molten steel, then, a slag forming agent and a reducing agent are added, after the temperature of the molten steel reaches 1,580-1,620 DEG C, tapping is conducted, the molten steel is mixed into an AOD furnace, the temperature of the molten steel is controlled to range from 1,520 DEG C to 1,720 DEG C, the slag basicity R is equal to 1.8-2.0, oxygen is blown in, and when the carbon content is reduced to 0.7% or below, argon is mixed in blowing gas till the carbon content is reduced to 0.1% or below, then, pure argon blowing is adopted through changing, decarburization continues, the steel grade requirement is met, and then, the slag forming agent, an alloy and an aluminum ingot are added; and finally, the bottom ofa steel ladle is inflated with the argon, an AOD furnace body is rotated for tapping. The austenitic stainless steel refining method has the characteristics that the smelting time is shortened, the production efficiency is improved, and procedure energy consumption is reduced.

Description

technical field [0001] The invention relates to a stainless steel refining method, in particular to an austenitic stainless steel refining method. Background technique [0002] With the continuous development of science and technology, the requirements for materials in military industry, medical equipment, industrial production and other fields are getting higher and higher. Traditional stainless steel cannot meet the requirements of cutting-edge fields. Due to the excellent comprehensive performance of austenitic stainless steel, such as ultra-low carbon stainless steel and super duplex steel, there is an increasing demand for austenitic stainless steel products that can meet special requirements in the market. big. However, there are a series of problems in the production of austenitic stainless steel, such as long smelting time, low production efficiency, high process energy consumption and high production cost. Therefore, the existing refining method of austenitic stai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06C21C7/064C21C7/068C21C7/072C21C5/52
CPCC21C5/005C21C7/06C21C7/064C21C7/0685C21C7/072Y02P10/20
Inventor 沈华代雨勃吴丽丽钱奕好沈振华高俊华
Owner 湖州盛特隆金属制品有限公司
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