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A method for obtaining the solidification pressure required for the preparation of high-nitrogen austenitic stainless steel by pressure induction and its preparation method

A high-nitrogen austenite, pressure induction technology, applied in metal processing equipment, steel manufacturing process, configuration of indicating equipment/measuring equipment, etc., can solve problems such as accelerated equipment loss, high metallurgical reaction temperature, and scrapped materials , to improve the quality of

Active Publication Date: 2022-01-25
NORTHEASTERN UNIV LIAONING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] For high-nitrogen austenitic stainless steel, its metallurgical reaction temperature is high, which makes it difficult to pressurize and has strict requirements on smelting equipment
In the process of pressurized induction preparation of high-nitrogen austenitic stainless steel, too high solidification pressure will accelerate equipment loss, increase production costs and easily induce production accidents, affecting production safety and smooth flow; on the contrary, too low solidification pressure cannot effectively prevent nitrogen from escaping And suppress defects such as nitrogen pores, what's more, the material will be directly scrapped, and it is difficult to realize the preparation of high-nitrogen austenitic stainless steel with uniform nitrogen composition and excellent compactness of solidified structure

Method used

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  • A method for obtaining the solidification pressure required for the preparation of high-nitrogen austenitic stainless steel by pressure induction and its preparation method
  • A method for obtaining the solidification pressure required for the preparation of high-nitrogen austenitic stainless steel by pressure induction and its preparation method
  • A method for obtaining the solidification pressure required for the preparation of high-nitrogen austenitic stainless steel by pressure induction and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0086] The target high-nitrogen austenitic stainless steel is 19Cr14Mn4Mo0.9N, and its composition control range and smelting control target are shown in Table 2.

[0087] Table 2 19Cr14Mn4Mo0.9N composition control range and control target (wt%)

[0088]

[0089] The method for obtaining solidification pressure includes the following steps:

[0090] (1) Based on the target composition of high-nitrogen austenitic stainless steel, use thermodynamic and kinetic calculation software to calculate the nitrogen diffusion coefficient D in the solid phase s 2.4×10 -9 , the solute distribution coefficient k of nitrogen during the solidification process is 0.18, and the solidification T of high-nitrogen austenitic stainless steel S is 1594.18K, liquidus temperature T L is 1649.27K;

[0091] (2) The maximum macro-segregation ratio Sr of nitrogen max and cooling rate acquisition:

[0092] Smelting the smelting raw material with the same composition as the high-nitrogen austenitic...

Embodiment 2

[0112] The target high-nitrogen austenitic stainless steel is 19Cr18Mn2Mo0.9N, and its composition control range and smelting control target are shown in Table 4.

[0113] Table 4 19Cr18Mn2Mo0.9N composition control range and control target (wt%)

[0114]

[0115] The method for obtaining solidification pressure includes the following steps:

[0116] (1) Based on the target composition of high-nitrogen austenitic stainless steel, use thermodynamic and kinetic calculation software to calculate the nitrogen diffusion coefficient D in the solid phase s 1.6×10 -9 , the solute distribution coefficient k of nitrogen during the solidification process is 0.18, and the solidification T of high-nitrogen austenitic stainless steel S is 1587.1K, the liquidus temperature T L It is 1630.7K.

[0117] (2) The maximum macro-segregation ratio Sr of nitrogen max and cooling rate acquisition:

[0118] Putting the smelting raw material with the same composition as the high-nitrogen austen...

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Abstract

The invention provides a method for obtaining solidification pressure required for the preparation of high-nitrogen austenitic stainless steel by pressure induction and a preparation method, belonging to the technical field of high-nitrogen austenitic stainless steel preparation. The obtaining method of the present invention refers to component segregation, nitrogen solubility and cooling rate in the process of pressurized induction smelting, and obtains accurate solidification pressure. Using this solidification pressure to prepare high-nitrogen austenitic stainless steel can effectively solve the problem of nitrogen escape and Nitrogen pores are formed to improve the quality of high nitrogen austenitic stainless steel.

Description

technical field [0001] The invention relates to the technical field of smelting high-nitrogen austenitic stainless steel, in particular to a method for obtaining solidification pressure required for the preparation of high-nitrogen austenitic stainless steel by pressure induction and a preparation method. Background technique [0002] High-nitrogen austenitic stainless steel has many unique advantages such as high strength, good toughness, non-magnetic properties, good corrosion resistance and good biocompatibility. Basic components such as collars, automobile engine exhaust valves, and cardiovascular stents have broad application prospects and are one of the key materials for the upgrading of basic materials in my country. [0003] So far, nitrogen pressure smelting is considered to be one of the most promising high-nitrogen steel preparation methods, especially for the preparation of higher nitrogen content (about 1%) high-quality austenitic stainless steel, nitrogen pressu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04B22D2/00C22C38/44C22C38/02C22C38/58
CPCC21C5/005C22C33/04C22C38/58C22C38/44C22C38/38C22C38/22C22C38/02C22C38/001B22D2/006C21C2300/06Y02P10/25
Inventor 李花兵朱红春冯浩姜周华何志禹毛东升张树才
Owner NORTHEASTERN UNIV LIAONING