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Decarbonization smelting method of high-manganese stainless steel

A smelting method and stainless steel technology are applied in the field of decarburization smelting of high-manganese stainless steel to achieve the effects of efficient recovery, high chromium recovery rate and significant economic benefits

Inactive Publication Date: 2018-12-21
HENAN TSINGSHAN JINHUI STAINLESS STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the purpose of the present invention is to provide a decarburization smelting method of high manganese stainless steel, to solve the problem that the existing process cannot directly use chromium manganese series stainless steel waste as raw material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The decarburization smelting method of high manganese stainless steel comprises the following steps:

[0020] 1) Put 48 tons of 201 series stainless steel waste and 4 tons of cold material into the electric furnace for melting. The melting temperature is 1570°C and the melting time is 120 minutes to form crude molten steel;

[0021] 2) Mix the crude molten steel into the AOD furnace, adjust the composition of the molten steel to: carbon 0.6%-0.8%, manganese 7.0%-8.0%, silicon 0.35%-0.45%, and the remaining components meet the requirements of the smelted steel;

[0022] 3) Blow pure oxygen at 1550°C for 7 minutes, control the decarburization temperature at 1650°C, and carry out decarburization operation. During the decarburization period, decarburization gas is blown into three stages, and O is blown into the first stage. 2 :N 2 =1:1, decarburization to 0.25%; O is blown into the second stage 2 :N 2 =1:2, decarburization to 0.15%; O is blown into the third stage 2 ...

Embodiment 2

[0025] The decarburization smelting method of high manganese stainless steel comprises the following steps:

[0026] 1) Put 48 tons of 201 series stainless steel waste and 4-6 tons of cold material into the electric furnace for melting. The melting temperature is 1580°C and the melting time is 120 minutes to form crude molten steel;

[0027] 2) Mix the crude molten steel into the AOD furnace, adjust the composition of the molten steel to: carbon 0.6%-0.8%, manganese 7.0%-8.0%, silicon 0.35%-0.45%, and the remaining components meet the requirements of the smelted steel;

[0028] 3) Blow pure oxygen at 1570°C for 5 minutes, control the decarburization temperature at 1670°C, and perform decarburization operation. The decarburization period is divided into three stages and the decarburization gas is blown in. The first stage is blown into O 2 :Ar=1:1, decarburization to 0.25%; blowing O in the second stage 2 :Ar=1:2, decarburization to 0.15%; O is blown into the third stage 2 :A...

Embodiment 3

[0031] The decarburization smelting method of high manganese stainless steel comprises the following steps:

[0032] 1) Put 48 tons of 201 series stainless steel waste and 4-6 tons of cold material into the electric furnace for melting. The melting temperature is 1600°C and the melting time is 120 minutes to form crude molten steel;

[0033] 2) Mix the crude molten steel into the AOD furnace, adjust the composition of the molten steel to: carbon 0.6%-0.8%, manganese 7.0%-8.0%, silicon 0.35%-0.45%, and the remaining components meet the requirements of the smelted steel;

[0034] 3) Blow pure oxygen at 1580°C for 5 minutes, control the decarburization temperature at 1680°C, and carry out the decarburization operation. During the decarburization period, the decarburization gas is blown into three stages, and the first stage is blown into O 2 :N 2 =1:1, decarburization to 0.25%; O is blown into the second stage 2 :Ar=1:2, decarburization to 0.15%; O is blown into the third stage...

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Abstract

The invention belongs to the technical field of stainless steel decarburization refining, and particularly relates to a decarbonization smelting method of high-manganese stainless steel. The method adopts waste of chromium-manganese-series stainless steel as a raw material, and is completed by special AOD refining. According to the method, electrolytic manganese or metal manganese does not need tobe added for batching after the AOD refining is carried out, manganese metal in the chromium-manganese-series waste steel can be efficiently recovered, and the preparation process is greatly facilitated; and the recovery rate of the manganese metal in the waste steel is improved, the cost of the raw materials is reduced, the waste steel scraps can be returned to the production stainless steel inone hundred percent, and the development of the production of the stainless steel in circulating energy economic is realized.

Description

technical field [0001] The invention belongs to the technical field of decarburization and refining of stainless steel, and in particular relates to a decarburization and smelting method of high manganese stainless steel. Background technique [0002] my country's nickel resources are scarce, and chromium resources are not rich. The chromium-manganese series (200 series or 201 series) austenitic stainless steel is developed on the basis of the chromium-nickel series austenitic stainless steel, adding manganese and (or) nitrogen to the steel instead of the precious metal nickel element. Nitrous elements, nitrogen in addition to manganese, and generally a moderate amount of nickel. Manganese in steel plays a role in stabilizing austenite. It is suitable for use on equipment and components that bear heavy loads but do not require high corrosion resistance. [0003] Chromium-manganese (200 series) stainless steel has a relatively high manganese content, generally more than 8%...

Claims

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Application Information

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IPC IPC(8): C21C7/068
CPCC21C7/0685
Inventor 邵志刚刘明会朱丽军马伟杰呼金栓刘杰
Owner HENAN TSINGSHAN JINHUI STAINLESS STEEL
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