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High-nitrogen high-manganese stainless steel and smelting method thereof

A smelting method and stainless steel technology, applied in the smelting field of high nitrogen and high manganese stainless steel, can solve the problems of long smelting time, low production efficiency and high smelting cost, and achieve optimal raw material cost, short nitrogen increasing time and fast decarburization speed. Effect

Active Publication Date: 2014-11-05
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is: overcoming the defects of long smelting time, low production efficiency and high smelting cost in the process of smelting high-manganese and high-nitrogen stainless steel in the prior art, and developing a new smelting process of high-manganese and high-nitrogen stainless steel craft

Method used

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  • High-nitrogen high-manganese stainless steel and smelting method thereof
  • High-nitrogen high-manganese stainless steel and smelting method thereof
  • High-nitrogen high-manganese stainless steel and smelting method thereof

Examples

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Effect test

Embodiment 1

[0089] 1. Batching and electric furnace smelting

[0090] Mix 16t of 20Mn23Al steel scrap, 40t of Cr13 steel scrap and 20t of high-carbon ferrochrome, add them into a 90t electric furnace, and remove the steel from the electric furnace; the composition of the steel at this time is determined to be: C 1.86%, Si 0.76% , Cr 23.95%, Mn 4.89%, P 0.02%. Pour the above molten steel into two 45t AOD ladles for AOD smelting;

[0091] 2. AOD smelting

[0092] (1) Decarburization process: Transfer the above two ladles with molten steel to the AOD station for smelting. Nitrogen is blown throughout the AOD smelting process, and the nitrogen flow rate is 2100Nm 3 / h, the temperature at which AOD starts to blow nitrogen is 1500°C, and the decarburization process is carried out. During the decarburization process, lime and high-carbon ferrochrome are continuously added to each ladle. The total amount is 1t; during the smelting process, the ratio of oxygen and nitrogen is adjusted according...

Embodiment 2

[0109] 1. Ingredients and electric furnace smelting

[0110] Mix 16t of 20Mn23Al steel scrap, 28t of Cr13 steel scrap and 32t of high-carbon ferrochromium, add them into a 90t electric furnace, and remove the steel from the electric furnace; the composition of the steel at this time is determined to be: C 2.56%, Si 0.86% , Cr 25.95%, Mn 4.6%, P 0.02%. Pour the above molten steel into two 45t AOD ladles for AOD smelting.

[0111] 2. AOD smelting

[0112] (1) Decarburization process: Transfer the above two ladles with molten steel to the AOD station for smelting. Nitrogen is blown throughout the AOD smelting process, and the nitrogen flow rate is 2200Nm 3 / h, the temperature at which AOD starts nitrogen blowing is 1470°C, and the decarburization process is carried out. During the decarburization process, lime and high-carbon ferrochrome are continuously added to each ladle. The total amount is 2t; during the smelting process, the oxygen-nitrogen ratio is adjusted according to...

Embodiment 3

[0129] 1. Batching and electric furnace smelting

[0130] Mix 10t of 20Mn23Al steel scrap, 24t of Cr13 steel scrap and 42t of high-carbon ferrochrome, add them into a 90t electric furnace, and remove the steel from the electric furnace; the composition of the steel at this time is determined to be: C 2.20%, Si 0.82% , Cr 27.80%, Mn 3.17%, P 0.02%. Pour the above molten steel into two 45t AOD ladles for AOD smelting;

[0131] 2. AOD smelting

[0132] (1) Decarburization process: Transfer the above two ladles with molten steel to the AOD station for smelting. Nitrogen is blown throughout the AOD smelting process, and the nitrogen flow rate is 2000Nm 3 / h, the temperature at which AOD starts nitrogen blowing is 1520°C, and the decarburization process is carried out. During the decarburization process, lime and high-carbon ferrochrome are continuously added to each ladle. The total amount is 1t; during the smelting process, the oxygen-nitrogen ratio is adjusted according to the...

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Abstract

The invention discloses a smelting method of stainless steel. The smelting method comprises the following steps: (1) an electric furnace smelting process: adding chromium-containing waste steel and manganese-containing waste steel into an electric furnace for smelting, and tapping after waste steel is molten completely in the electric furnace, wherein the content of manganese is controlled to be 3-6%, and the content of chromium is controlled to be 24-28%; (2) a nitrogen-oxygen decarbonization refining process: transferring molten steel into a refining station of a nitrogen-oxygen refining furnace for refining under the condition that nitrogen is introduced at the flow rate of 2000-2200Nm<3> / h in the whole refining course, decarbonizing at first, adding metal Mn after decarbonizing is completed, raising the temperature, then, reducing, slagging after reducing, adding manganese alloy after slagging under the condition that the flow rate of nitrogen is 900-1100Nm<3> / h at the moment, stirring, and then tapping molten steel into a die casting ladle; (3) a ladle refining process, wherein nitrogen-manganese alloy is added stepwise in a refining process, and then argon blowing treatment is carried out; and (4) a die casting process. The invention further provides stainless steel obtained by using the smelting method. The smelting method disclosed by the invention has the advantages of shortening smelting time, improving nitrogen adding efficiency, reducing nitrogen adding cost and improving the purity degree of the molten steel.

Description

technical field [0001] The invention relates to a method for smelting high-nitrogen and high-manganese stainless steel, and also relates to the high-nitrogen and high-manganese stainless steel prepared by the method. Background technique [0002] In the application of stainless steel, low-carbon, high-manganese, high-nitrogen non-magnetic stainless steel is mainly used in the petroleum industry to manufacture high-strength materials such as non-magnetic drill collars for measuring oil well orientation, bridge cables, automobile brackets, high-strength bolts, wear-resistant mesh, and elastic materials. . Various demands are constantly increasing, and the requirements for its smelting methods are also getting higher and higher. [0003] At present, the smelting of low-carbon, high-manganese, high-nitrogen and non-magnetic stainless steel generally adopts the following process: electric furnace - ladle refining furnace (LF furnace) - die casting, intermediate frequency furnace...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/38C22C33/06
Inventor 刘明生赵大同赵晓明武鹏李谦谭建兴段鹏飞
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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