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A method for smelting high-nitrogen austenitic stainless steel by pressurized electroslag remelting gas-phase nitriding

A high nitrogen austenite, pressurized electric slag technology, applied in the field of high nitrogen steel smelting, can solve the problems of reducing nitrogen increase effect and the like

Active Publication Date: 2018-04-24
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the smelting parameters and nitrogen pressure of the pressurized electroslag remelting process have a significant impact on the nitrogen content in high-nitrogen austenitic stainless steel and the quality control of the ingot. If the process is not properly matched, the nitrogen increase effect will be significantly reduced, and even slag grooves will be generated. surface quality problem

Method used

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  • A method for smelting high-nitrogen austenitic stainless steel by pressurized electroslag remelting gas-phase nitriding
  • A method for smelting high-nitrogen austenitic stainless steel by pressurized electroslag remelting gas-phase nitriding
  • A method for smelting high-nitrogen austenitic stainless steel by pressurized electroslag remelting gas-phase nitriding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 200kg target steel grade 18Cr14Mn3Mo0.7N is smelted by pressurized electroslag remelting gas phase nitriding, and its composition (wt.%) is as follows:

[0024]

[0025] The nitrogen solubility [%N] of 18Cr14Mn3Mo0.7N at 1500°C and normal pressure is calculated by the following formula:

[0026]

[0027] In the formula: is nitrogen pressure, p Θ is the standard atmospheric pressure.

[0028] The calculation result of nitrogen solubility [%N] is 0.610%, and it is determined that the nitrogen content of the base material of the consumable electrode base material for smelting high-nitrogen austenitic stainless steel in a vacuum induction furnace is about 0.5%.

[0029] According to the elemental composition of the target steel type, use a vacuum induction furnace, pass nitrogen protection during the smelting process, add chromium nitride to smelt the consumable electrode base material with a nitrogen content of 0.48%, and the composition is as follows:

[0030] ...

Embodiment 2

[0039] 200kg target steel grade 18Cr18Mn3Mo1.1N was smelted by pressurized electroslag remelting gas phase nitriding, and its composition (wt.%) is as follows:

[0040]

[0041] The nitrogen solubility [%N] of 18Cr18Mn3Mo1.1N at 1500°C and normal pressure is calculated by the following formula:

[0042]

[0043] In the formula: is nitrogen pressure, p Θ is the standard atmospheric pressure.

[0044] The calculation result of nitrogen solubility [%N] is 0.872%, and it is determined that the nitrogen content of the base material of the consumable electrode base material for smelting high-nitrogen austenitic stainless steel in a vacuum induction furnace is about 0.66%.

[0045] According to the elemental composition of the target steel, use a vacuum induction furnace, pass nitrogen protection during the smelting process, and add chromium nitride to smelt to obtain a consumable electrode base material with a nitrogen content of 0.65%. The composition is as follows:

[00...

Embodiment 3

[0055] 200kg target steel grade 24Cr28Mn3Mo2Ni1.9N is smelted by pressurized electroslag remelting vapor phase nitriding, and its composition is as follows:

[0056]

[0057] The nitrogen solubility [%N] of 24Cr28Mn3Mo2Ni1.9N at 1500°C and normal pressure is calculated by the following formula:

[0058]

[0059] In the formula: is nitrogen pressure, p Θ is the standard atmospheric pressure.

[0060] The calculation result of nitrogen solubility [%N] is 1.681%, and it is determined that the nitrogen content of the base material of the consumable electrode base material for smelting high-nitrogen austenitic stainless steel in a vacuum induction furnace is about 1.4%.

[0061] According to the elemental composition of the target steel, use a vacuum induction furnace, pass nitrogen protection during the smelting process, and add chromium nitride for smelting to obtain a consumable electrode base material with a nitrogen content of 1.36%. The composition is as follows:

...

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Abstract

The invention belongs to the technical field of high-nitrogen steel smelting. Specifically, it is a method for smelting high-nitrogen austenitic stainless steel by pressurized electroslag remelting, gas-phase nitriding, and is characterized by: smelting the nitrogen content in the smelting furnace according to the composition of the target steel grade. It is a consumable electrode base material of (0.75 ~ 0.9) to 1~3MPa, simultaneously increase the cooling water pressure, and use low melting speed to smelt and feed at 40~45V and 3000~4200A. Its advantage is that by reasonably controlling parameters such as current, voltage, and nitrogen pressure, the gas phase nitriding method is used to achieve efficient nitrogen alloying in high-nitrogen austenitic stainless steel. Nitrogen austenitic stainless steel provides technical support.

Description

technical field [0001] The invention relates to the field of high-nitrogen steel smelting, in particular to a method for smelting high-nitrogen austenitic stainless steel by pressurized electroslag remelting gas-phase nitriding. Background technique [0002] Because austenitic stainless steel has good toughness, resistance to uniform corrosion and local corrosion, it is widely used in chemical industry, paper and pulp industry, medical equipment, etc., but the insufficient strength of low carbon and ultra-low carbon austenitic stainless steel limits this. Further application of class steel. Nitrogen is added to austenitic stainless steel as a gap strengthening element, which can greatly improve the stability of austenite, partially or completely replace expensive Ni, and improve the strength of steel through the synergistic effect with other alloying elements (Cr, Mo, etc.) , toughness, wear resistance and corrosion resistance, etc. [0003] Under normal pressure, in order...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B9/18C22C33/04C21C7/00
CPCC21C7/0081C22B9/18C22C33/04
Inventor 李花兵姜周华冯浩张彬彬朱红春张树才刘福斌柴晓星
Owner NORTHEASTERN UNIV LIAONING