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Sectional type pressurizing solid solution nitriding accelerating method of austenitic stainless steel

An austenitic stainless steel, segmented technology, used in solid-state diffusion coating, coating, metal material coating technology and other directions, can solve the problem of reducing the solid solution nitriding temperature, reduce costs and equipment loss, shorten the Process cycle, the effect of improving efficiency

Inactive Publication Date: 2013-05-08
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Through the retrieval of the prior art, it was found that the article "Solid Solution Nitriding Technology of 15Cr-7.5Mn-2.6Mo Duplex Stainless Steel" published by the author Fu Rui-dong used high-temperature multi-stage solid solution nitriding, but the temperature of each stage of the process Both are greater than 1050°C, which does not fundamentally reduce the solid solution nitriding temperature

Method used

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  • Sectional type pressurizing solid solution nitriding accelerating method of austenitic stainless steel
  • Sectional type pressurizing solid solution nitriding accelerating method of austenitic stainless steel
  • Sectional type pressurizing solid solution nitriding accelerating method of austenitic stainless steel

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Embodiment 1

[0017] Process 304 austenitic stainless steel into a thin plate and hang it in a solid solution nitriding furnace with the patent name "A pressurized high-temperature nitriding device with a double-pressure balance structure" and application number 201210530358.6, and pass it at 0.5L / min into NH 3 gas, heated to 500°C, and nitrided for 10 hours under the pressure of 0.25MPa. Then the NH in the furnace 3 Discharge and feed N at a flow rate of 5L / min 2 , rapidly heated to 1150 ° C, solid solution nitriding under 0.25MPa pressure conditions for 10h, and then rapidly water-cooled to room temperature. The thickness of the solid solution nitrided layer obtained in this embodiment can reach about 311 μm, such as figure 1 shown.

Embodiment 2

[0019] Process 304 austenitic stainless steel into a thin plate and hang it in the solid solution nitriding furnace with the patent name "A pressurized high-temperature nitriding device with a double-pressure balance structure" patent number 201210530358.6, and feed NH at 1L / min 3 gas, heated to 700°C, and nitrided for 5h under the pressure of 0.1MPa. Then the NH in the furnace 3 Discharge and feed N at a flow rate of 3L / min 2 , rapidly heated to 1050 ° C, solid solution nitriding under 0.15MPa pressure conditions for 10h, and then rapidly cooled to room temperature with water. The thickness of the solid solution nitrided layer obtained in this embodiment can reach about 160 μm, such as figure 2 shown.

Embodiment 3

[0021] Process 316 austenitic stainless steel into a thin plate and hang it in the solid solution nitriding furnace with the patent name "A pressurized high-temperature nitriding device with a double-pressure balance structure" patent number 201210530358.6, and feed NH at 1L / min 3 gas, the temperature was raised to 600°C, and nitriding was carried out for 5 hours under the pressure of 1.0MPa. Then the NH in the furnace 3 Discharge and feed N at a flow rate of 5L / min 2 , quickly raised the temperature to 900°C, solid solution nitriding under 1.0MPa pressurized condition for 1h, and then rapidly water-cooled to room temperature. The thickness of the solid solution nitrided layer obtained in this embodiment can reach about 90 μm, such as image 3 shown.

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Abstract

The invention disclosed a sectional type pressurizing solid solution nitriding accelerating method of austenitic stainless steel. The method mainly comprises the following steps of: putting the austenitic stainless steel in a solid solution nitriding furnace provided in an invention with the patent name of a pressurizing high-temperature nitriding device with a dual-pressure equilibrium structure and a patent number of 201210530358.6, introducing NH3 into the furnace at the flow velocity of 0.5-2L / min till the pressure in the furnace reaches 0.1-1.0MPa, carrying out NH3 nitriding pretreatment for 5-10 hours at the temperature of 500-700 DEG C, completely discharging the NH3 in the solid solution nitriding furnace, introducing N2 into the furnace at the flow velocity of 1-5L / min till the pressure in the furnace reaches 0.1-1.0MPa, rapidly heating the furnace till the temperature of the furnace reaches 900-1200 DEG C, carrying out N2 solid solution nitriding treatment for 1-20 hours under the conditions, rapidly cooling to room temperature by using water and forming a solid solution nitriding layer on the surface of the austenitic stainless steel. By means of the method disclosed by the invention, the nitriding efficiency can be improved; the whole nitrogen content of the diffusion layer is increased and the diffusion part grain coarsening in the nitriding process is effectively slowed and even avoided.

Description

technical field [0001] The invention relates to a metal surface chemical heat treatment method, in particular to a solid solution nitriding method for austenitic stainless steel. Background technique [0002] As a new surface chemical heat treatment technology, solid solution nitriding has been widely used in the production of medicine, chemical industry, machinery manufacturing and so on. Traditional solid solution nitriding is generally realized at high temperature (1050-1200°C) and a certain pressure of nitrogen atmosphere. In order to increase the thickness and nitrogen content of the solid solution nitrided layer, it is necessary to 2 Environment for a long time insulation treatment to ensure N 2 A large number of active N atoms are decomposed and a higher diffusion rate is obtained, which inevitably leads to grain coarsening and overall performance deterioration of austenitic stainless steel, and increases the loss rate of equipment in industrial production. Therefo...

Claims

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Application Information

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IPC IPC(8): C23C8/26
Inventor 傅万堂王博时钟平曲明贵王振华吕知清刘天洋
Owner YANSHAN UNIV
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