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One-step method for producing high-nitrogen austenitic stainless steel

A nitrogen austenitic and stainless steel technology, applied in the field of one-step production of high-nitrogen austenitic stainless steel, can solve the problems of complex smelting methods of high-nitrogen austenitic stainless steel, high-nitrogen stainless steel casting products cannot be popularized and applied, and meet the technological conditions Easy-to-control, simple-to-operate effects

Inactive Publication Date: 2019-10-01
吉林常春高氮合金研发中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] High-nitrogen stainless steel casting products cannot be widely used. The main reason is that the smelting method of high-nitrogen austenitic stainless steel is too complicated, and it is poured under normal pressure or low pressure. During the solidification process, the precipitation of supersaturated nitrogen and the overflow of nitrogen gas are easy to form pores. Distributed in ingot or casting products

Method used

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  • One-step method for producing high-nitrogen austenitic stainless steel
  • One-step method for producing high-nitrogen austenitic stainless steel
  • One-step method for producing high-nitrogen austenitic stainless steel

Examples

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Effect test

Embodiment 1

[0016] Take smelting 100kg Cr21Mn22Mo2.5N0.8 high-nitrogen austenitic stainless steel as an example, the chemical composition of high-nitrogen steel is as follows (%, percent by weight):

[0017]

[0018] The method for producing high-nitrogen austenitic stainless steel by one-step method specifically includes the following steps:

[0019] (1), chromium-containing scrap (Cr13 scrap) and manganese-containing scrap (20Mn23Al scrap) are added to the electric furnace for smelting, the manganese content is controlled to be 10-20%, and the chromium content is 15%-24%; then the molten steel is transferred to nitrogen Oxygen refining furnace refining station for refining, control the temperature of molten steel at 1470-1520°C, feed nitrogen throughout the refining process, and control the flow of nitrogen at 1800-2000Nm 3 / h;

[0020] (2) Fix the position of the top lance at 2.8 meters, control the temperature of the top lance at 1650-1680°C, and carry out the oxygen blowing decar...

Embodiment 2

[0025] Take smelting 100kg Cr23Mn21Mo2.5N0.7 high-nitrogen austenitic stainless steel as an example, the chemical composition of high-nitrogen steel is as follows (%, weight percentage):

[0026]

[0027] The method for producing high-nitrogen austenitic stainless steel by one-step method specifically includes the following steps:

[0028] (1), chromium-containing scrap steel (high carbon ferrochrome) and manganese-containing scrap steel (20Mn23Al scrap steel) are added to the electric furnace for smelting, and the manganese content is controlled to be 16-20%, and the chromium content is 20%-24%; then the molten steel is transferred to Go to the refining station of nitrogen and oxygen refining furnace for refining, control the temperature of molten steel at 1490-1520°C, feed nitrogen throughout the refining process, and control the flow rate of nitrogen at 1920-2000Nm 3 / h;

[0029] (2) Fix the position of the top lance at 2.8 meters, control the temperature of the top lan...

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Abstract

The invention discloses a one-step method for producing high-nitrogen austenitic stainless steel. The method comprises the following procedures that (1), chromium-contained steel scrap and manganese-contained steel scrap are added into an electric furnace for smelting, and are transferred to a refining station of a nitrogen-oxygen refining furnace for refining, and nitrogen is introduced into therefining furnace in the whole refining process; (2) an oxygen blowing decarburization process is conducted, after oxygen beings to be blown for 1 minute, micro-carbon ferrochrome powder, ferro-molybdenum powder and slag material are added, after decarbonization is ended, low-carbon manganese-silicon and electrolytic manganese are added for alloying, and the ferrosilicon adding oxygen-blowing heating reduction operation is conducted; and (3) a slag remover is added to remove the slag, a nitrogen-manganese alloy is added, the nitrogen is introduced, then fluorite is added for desulfurization, switching between nitrogen and argon is conducted during desulfurization, and argon blowing is conducted in the whole process. The method is simple to operate, and can produce the high-nitrogen austenitic stainless steel with the high nitrogen content and free of pore defects.

Description

technical field [0001] The invention belongs to the field of iron and steel smelting and manufacturing, and in particular relates to a method for producing high-nitrogen austenitic stainless steel in one step. Background technique [0002] Nitrogen-alloyed high-nitrogen alloy steel, which has been widely valued in the world since the end of the 1980s, includes materials such as high-nitrogen stainless steel and high-nitrogen tool steel, especially high-nitrogen stainless steel. It is even used as a strategic structural material. [0003] High-nitrogen stainless steel generally adopts pressurized smelting technology, and high-nitrogen steel is smelted under high pressure. The casting of products is limited by differential pressure casting technology. Most of the existing technologies are casting products under relatively high pressure. There are only a few reports on smelting or ingot casting. The high-nitrogen retaining ring steel ingots reported in China only provide the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/38C22C38/02C22C38/22C22C33/06C21C5/52C21C7/064
CPCC21C5/005C21C7/0645C22C33/06C22C38/001C22C38/02C22C38/22C22C38/38Y02P10/20
Inventor 陈咨伟
Owner 吉林常春高氮合金研发中心有限公司
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