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Method for accurately controlling nitrogen content in high-nitrogen stainless steel

A technology for high-nitrogen stainless steel and nitrogen content, which is applied in the field of precise control of nitrogen content in high-nitrogen stainless steel, and can solve problems such as excessive nitrogen content, shortened equipment life, and low nitrogen solubility

Active Publication Date: 2021-09-14
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the precise setting of pressure in the above process is a difficult problem in the popularization and application of pressurized metallurgy technology. If the pressure is set too high, the nitrogen content in the molten steel will exceed the standard, and the life of the equipment will be seriously shortened, which will easily lead to safety accidents; on the contrary, if the solubility of nitrogen is too low, nitrogen The content cannot reach the target value, and it is difficult to suppress the formation of solidification defects such as pores, and even lead to the direct scrapping of the material

Method used

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  • Method for accurately controlling nitrogen content in high-nitrogen stainless steel
  • Method for accurately controlling nitrogen content in high-nitrogen stainless steel
  • Method for accurately controlling nitrogen content in high-nitrogen stainless steel

Examples

Experimental program
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Effect test

Embodiment 1

[0075] The target steel grade of this embodiment is 18Cr18Mn2Mo0.9N, and its composition control range and smelting control target are shown in Table 1.

[0076] Table 1 18Cr18Mn2Mo0.9N composition control range and control target (wt%)

[0077] Element C Si mn N Cr Mo P S Fe Control range ≤0.1 ≤0.80 17.5～20.0 0.75～1.0 17.5～20.0 1.5～2.5 ≤0.03 ≤0.015 margin Control objectives 0.10 0.50 18.00 0.90 18.30 2.00 ≤0.03 ≤0.015 margin

[0078] Specific steps are as follows:

[0079] (I) Put industrial pure iron, metal chromium, metal molybdenum and metal nickel into the induction furnace, put metal manganese, industrial silicon, chromium nitride, graphite and electrolytic aluminum in the feeding bin; vacuum the furnace to 5Pa , and energized to raise the temperature until the smelting raw materials in the pressurized induction furnace are fully melted to melt, and then the furnace is filled with high-purity nitrogen with a purit...

Embodiment 2

[0091] The target steel grade of this embodiment is 19Cr18Mn2Mo0.9N, and its composition control range and smelting control target are shown in Table 3.

[0092] Table 3 19Cr18Mn2Mo0.9N composition control range and control target (wt%)

[0093]

[0094]

[0095] Specific steps are as follows:

[0096] (I) Put industrial pure iron, metallic chromium or ferrochromium, metallic molybdenum or ferromolybdenum, and metallic nickel into the induction furnace, and place metallic manganese, industrial silicon, chromium nitride, graphite, and electrolytic aluminum in the feeding bin; Vacuum the furnace to 5Pa, and turn on the power to raise the temperature until the smelting raw materials in the pressurized induction furnace are fully melted to melt; then fill the furnace with high-purity nitrogen with a purity ≥ 99.999% to P 冶炼 , and then add industrial silicon, manganese metal, chromium nitride, and graphite into the furnace through the feeding bin for alloying, and then add e...

Embodiment 3

[0109] The target steel grade of this embodiment is 19Cr18Mn2Mo0.9N, and its composition control range and smelting control target are shown in Table 5.

[0110] Table 5 19Cr18Mn2Mo0.9N composition control range and control target (wt%)

[0111] Element C Si mn N Cr Mo P S Fe Control range ≤0.1 ≤0.80 17.5～20.0 0.75～1.0 17.5～20.0 1.5～2.5 ≤0.03 ≤0.015 margin Control objectives 0.10 0.50 18.00 0.90 19.00 1.80 ≤0.03 ≤0.015 margin

[0112] Specific steps are as follows:

[0113] Ⅰ. Put industrial pure iron, metallic chromium or ferrochromium, metallic molybdenum or ferromolybdenum, and metallic nickel into the induction furnace, and place easily oxidized or volatile metallic manganese, industrial silicon, chromium nitride, graphite, and electrolytic aluminum into the feeding furnace. In the warehouse; the furnace is vacuumed to 5Pa, and the temperature is raised until the smelting raw materials in the pressurized induction f...

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Abstract

The invention belongs to the technical field of high-nitrogen stainless steel smelting. According to the method for accurately controlling the nitrogen content in the high-nitrogen stainless steel, the pressure, namely the smelting pressure, of vacuum nitrogen filling during smelting can be accurately calculated through calculation formulas (1)-(3), and the nitrogen content in the high-nitrogen stainless steel obtained through smelting under the pressure can be very close to the nitrogen content in target steel; and even the nitrogen content in the target steel can be accurately achieved, the structure of the steel part is uniform, and accurate control over the nitrogen component in the high-nitrogen stainless steel through pressurized induction smelting is effectively achieved. The result of the embodiment shows that according to the high-nitrogen stainless steel prepared through the method, the deviation between the detected nitrogen content and the nitrogen content in target steel is only 0.01-0.02%, and accurate control over the nitrogen component in the high-nitrogen stainless steel through pressurized induction smelting is achieved.

Description

technical field [0001] The invention belongs to the technical field of high-nitrogen stainless steel smelting, and in particular relates to a method for precisely controlling the nitrogen content in high-nitrogen stainless steel. Background technique [0002] The addition of nitrogen to stainless steel can partially or completely replace expensive nickel in steel, thereby increasing the strength of stainless steel, improving low-temperature impact toughness, strengthening corrosion resistance and stress corrosion resistance, etc. Therefore, high-nitrogen stainless steel has broad application prospects in key fields such as aerospace, petrochemical, marine, energy and military. However, for high-nitrogen stainless steel, since the solubility of nitrogen in steel is limited at normal pressure, it is difficult to prepare high-performance high-nitrogen stainless steel with nitrogen content exceeding the solubility at normal pressure. [0003] At present, in order to ensure a hi...

Claims

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Application Information

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IPC IPC(8): C21C5/00C21C7/00C22C33/06C22C38/02C22C38/22C22C38/44C22C38/58B22D18/04
CPCC21C5/005C22C33/06C22C38/02C22C38/22C22C38/001C22C38/58C22C38/44C21C7/00B22D18/04
Inventor 李花兵朱红春毛东升姜周华冯浩何志禹张树才贺彤
Owner NORTHEASTERN UNIV
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