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Process method for nitriding austenitic stainless steel material

A technology of austenitic stainless steel and process method, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., to achieve the effect of simple process, easy promotion and good practicability

Active Publication Date: 2010-02-17
GUIZHOU HONGLIN MACHINERY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for stainless steel materials, especially austenitic stainless steel used in aviation parts, due to the very high requirements on the uniformity and grain size of the material, the nitriding process is used for the nitriding of austenitic stainless steel materials similar to 1Cr18Mn8Ni5N. Nitrogen treatment method is still blank

Method used

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  • Process method for nitriding austenitic stainless steel material

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Embodiment

[0014] Next, nitriding treatment is carried out on the austenitic stainless steel specimens whose material is 1Cr18Mn8Ni5N, and all three specimens are processed into the specifications of Φ10×20mm, put into ordinary electric furnace, and annealed at 810°C for 2 hours;

[0015] Clean test pieces 1 and 2 with gasoline, clean test piece 3 with acetone, and blow dry;

[0016] Mix 8g of ammonium chloride and 390g of quartz sand evenly, place them at the bottom of the nitriding box, and then add 80g / m 3 ammonium chloride. The important function of adding ammonium chloride is to use it to decompose in the nitriding furnace to generate HCI, remove the passivation film on the surface of the workpiece, and it also has the effect of promoting the formation of metal nitrides;

[0017] Put the test pieces on the trays in the nitriding box respectively, seal the nitriding box well, and feed ammonia gas until the ammonia decomposition rate is zero, push the nitriding box into the furnace, ...

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Abstract

The invention aims to provide a method for nitriding an austenitic stainless steel material, which comprises a pretreatment process before nitriding the austenitic stainless steel material and a nitriding process. The pretreatment process before nitriding the austenitic stainless steel material is to clean a test piece with gasoline and anneal the test piece at a temperature of 810 DEG C for 2 hours. The nitriding process comprises the following steps: cleaning the test piece again with the gasoline or acetone, or blowing sands on the test piece with low wind pressure fine sands; then evenly mixing ammonia chloride and quartz sands in proportion, putting the mixture at the bottom of a nitriding box, adding the ammonia chloride into the nitriding box, putting the test piece on a material tray in the nitriding box, sealing the nitriding box, passing ammonia gas into the nitriding box, and pushing the nitriding box into a furnace when the ammonia decomposition rate is zero; and when the furnace temperature is between 595 and 605 DEG C, keeping the temperature for 10 to 20 hours, then raising the furnace temperature to between 620 and 645 DEG C or between 620 and 655 DEG C, continuously keeping the temperature for 10 to 20 hours, taking the nitriding box out from the furnace after finishing keeping the temperature, cooling the nitriding box in the air to a temperature less than orequal to 100 DEG C, detaching the nitriding box and then ending the nitriding process.

Description

technical field [0001] The invention relates to a nitriding process, in particular to the nitriding process of stainless steel materials, and belongs to the field of metal heat treatment. Background technique [0002] The nitriding process is widely used in steel materials in order to improve the wear resistance and corrosion resistance of parts. However, for stainless steel materials, especially austenitic stainless steel used in aviation parts, due to the very high requirements on the uniformity and grain size of the material, the nitriding process is used for the nitriding of austenitic stainless steel materials similar to 1Cr18Mn8Ni5N. Nitrogen treatment method is still blank. Contents of the invention [0003] The object of the present invention is to provide a nitriding treatment method for austenitic stainless steel materials. [0004] In order to ensure that the core of the nitrided part has good comprehensive mechanical properties, reduce the dimensional change ...

Claims

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Application Information

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IPC IPC(8): C23C8/26
Inventor 蔡桂珍罗进袁洪梅
Owner GUIZHOU HONGLIN MACHINERY
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