Treatment process of composite surface of austenitic stainless steel

A technology of austenitic stainless steel and composite treatment, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of decreased corrosion resistance of stainless steel and reduction of chromium content on the surface of austenitic stainless steel, and achieves Effect of improving corrosion resistance, improving surface wear resistance, and high wear resistance

Active Publication Date: 2013-04-03
CHANGZHOU UNIV
View PDF2 Cites 19 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during ion nitriding, chromium atoms in austenitic stainless steel are very easy to combine with nitrogen atoms to form chromium nitrides, which reduces the chromium content on the surface of austenitic stainless steel, resulting in a decrease in the corrosion resistance of stainless steel

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Treatment process of composite surface of austenitic stainless steel
  • Treatment process of composite surface of austenitic stainless steel
  • Treatment process of composite surface of austenitic stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0021] A composite treatment process for austenitic stainless steel; the process comprises the following steps:

[0022] (1) Grind the surface of the stainless steel workpiece with 320#~1200# SiC sandpaper in turn, and then use Cr 2 O polishing powder is polished to a mirror surface;

[0023] (2) Use absolute ethanol or acetone to ultrasonically clean the stainless steel workpiece for more than 5 minutes to remove oil and impurities on the surface of the workpiece, and dry it for use;

[0024] (3) After the stainless steel workpiece is cooled, put it into the ion nitriding furnace, pass in the dried hydrogen gas, then start to heat up, and when it reaches 560°C, pass in nitrogen gas, and adjust the ratio of nitrogen gas and hydrogen gas to 1: 3; Start timing when the pressure in the furnace is 300pa;

[0025] (4) After the holding time reaches 8 hours, close the nitrogen inlet valve, continue to feed hydrogen, reduce the current and voltage values, and when the temperature d...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention belongs to the technical field of metal surface modification, and in particular relates to a treatment process of a composite surface of an austenitic stainless steel. The process mainly comprises the following steps: 1) washing the surface of a workpiece, and removing the oil stain and impurities on the surface of the workpiece; 2) putting the stainless steel workpiece into an ion nitriding furnace after being cooled down, introducing dried hydrogen, building up of luminance and heating up, after reaching a certain temperature, introducing nitrogen, adjusting the ratio of the nitrogen to the hydrogen and the pressure in the furnace, and subsequently starting to time; and 3) after nitriding for a certain time, stopping introducing the nitrogen, introducing dried air and keeping the temperature for a certain time. Not only is the surface abrasion resistance of the stainless steel treated by using the treatment process improved, but also the excellent corrosion resistance of the stainless steel self is maintained.

Description

technical field [0001] The invention belongs to the technical field of metal surface modification, and in particular relates to a composite treatment process for austenitic stainless steel. Background technique [0002] Ion nitriding is an ion chemical heat treatment process that infiltrates nitrogen atoms into the metal surface to change the chemical composition and microstructure of the metal surface. After ion nitriding, a dense compound layer can be formed on the workpiece surface. This compound layer has high hardness and surface wear resistance, which can greatly improve the service life of metal workpieces, so it has been widely used. [0003] Austenitic stainless steel has excellent corrosion resistance, so austenitic stainless steel is widely used in food, medical, chemical and other fields. However, austenitic stainless steel has low surface hardness and poor wear resistance, which greatly limits its application range. At present, some studies have explored the a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/34C23C8/38C23C8/10
Inventor 胡静蔡伟王树凯李景才
Owner CHANGZHOU UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap