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Nitride salt for low temperature salt bath nitriding of stainless steel

A technology of salt bath nitriding and nitriding salt, which is applied in the field of nitriding salt, can solve the problem of high applicable temperature of nitriding base salt, and achieve the effect of good wear resistance and corrosion resistance of workpieces

Inactive Publication Date: 2012-11-28
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] The purpose of the invention is to overcome the high applicable temperature of nitriding base salt in the current stainless steel salt bath nitriding process, and provide a nitride salt that can be used for low temperature salt bath nitriding process on stainless steel

Method used

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  • Nitride salt for low temperature salt bath nitriding of stainless steel

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Embodiment 1

[0015] Present embodiment 1 nitride salt is made up of following composition by weight percentage: KCNO 20%, NaCNO30%, K 2 CO 3 13%, Na 2 CO 3 6.5%, Li 2 CO 3 6%, NaCl 12%, KCl 12%, NaCl 2 SO 4 0.5%. This embodiment 1 is suitable for use under the nitriding process condition of 450° C., and the environment of the nitriding salt bath is stable. Austenitic stainless steel 321 steel nitride metallographic results are as follows figure 1 shown.

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Abstract

The invention discloses nitride salt for low temperature salt bath nitriding of austenitic stainless steel. The nitride salt consists of the following components in percentage by weight: 1%-55% of KCNO, 1%-55% of NaCNO, 35%-15% of K2CO, 33%-15% of Na2CO, 33%-15% of Li2CO, 5%-15% of NaCl, 5%-15% of KCl and 40.1%-2% of Na2SO. In the invention, the temperature of the common salt bath nitriding is lowered and the using temperature of the currently known nitride salt is enlarged. In addition, the nitride salt has the advantages that the deformation of the processed workpiece is very small, the equipment is simple, the pollution-free work is realized and the like.

Description

technical field [0001] The invention relates to a nitride salt used in the stainless steel low temperature salt bath nitriding process. Background technique [0002] The salt bath nitriding process technology is also called soft nitriding treatment technology, which uses the active nitrogen atoms generated by the decomposition of cyanate to penetrate into the workpiece, forming an iron compound layer and diffusion layer on the surface of the workpiece, thereby improving the wear resistance of iron-based materials resistance, corrosion resistance and fatigue strength. Therefore, salt bath nitriding has been widely used in production practice. However, the current salt bath nitriding treatment technology applied to stainless steel has the following disadvantages: the applicable temperature of the nitriding base salt is relatively high, generally between 520 and 600 °C, and is not suitable for low temperature treatment. Contents of the invention [0003] The purpose of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/50
Inventor 王均熊计范洪远
Owner SICHUAN UNIV
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