Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Nitrocarburizing method of martensitic stainless steel and preparation method thereof

A martensitic stainless steel, nitrocarburizing technology, applied in coating, metal material coating process, solid-state diffusion coating, etc., can solve the problem of difficulty in ensuring the safety of aircraft, and achieve improved safety and superior technical performance. Effect

Inactive Publication Date: 2009-03-25
SICHUAN LINGFENG AVIATION HYDRAULIC MACHINERY
View PDF0 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in some special occasions, such as the flat valve assembly of an aircraft, there are several parts in the assembly that need to be made of martensitic stainless steel and then subjected to nitrocarburizing to meet the requirements of use. Otherwise, the safety of the aircraft will be damaged. Difficult to guarantee

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
  • Nitrocarburizing method of martensitic stainless steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] Now take the nitrocarburizing heat treatment of 2Cr13 martensitic stainless steel (the thickness of the part is 10mm) as an example to describe the present invention in detail.

[0025] The martensitic stainless steel material is rough-machined into semi-finished parts, leaving a finishing allowance. then follow figure 1 The steps shown are processed:

[0026] 1. Quenching and tempering heat treatment

[0027] Quenching and tempering treatment of semi-finished parts, keeping (10+2 minutes / mm parts thickness) at 1030°C for 30 minutes during quenching, oil cooling; high temperature tempering at 620°C (60+1 minutes / mm Thickness of parts) heat preservation for 70 minutes, water cooling; check the hardness HRC24-28, check the core structure according to HB5022-94.

[0028] The above-mentioned quenching and tempering treatment can also be carried out after blanking, and the raw materials of the parts are quenched and tempered and then roughly processed into semi-finished p...

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 discloses a nitrocarburizing method of martensitic stainless steel with the chrome content of 10 wt percent to 15 wt percent and a product thereof. The nitrocarburizing method includes the following steps: after the semi-finished product is treated by quenching and tempering, oil stain removal and film passivating, the nitrocarburizing is followed within the temperature range of 550 DEG C to 560 DEG C in the atmosphere of ammonia and carbon dioxide, with the depth of a nitrocarburized layer more than or equal to 0.05mm and the surface harness of a carburized layer HV more than or equal to 509; then, the semi-finished product is refined into the finished product; and finally the finished product is passivated in passivation solution to ensure the stable physicochemical property of the surface.

Description

technical field [0001] The invention relates to a nitrocarburizing method on the surface of a metal body, in particular to a martensitic stainless steel nitrocarburizing method and its products. Background technique [0002] Nitrocarburizing on the surface of austenitic stainless steel products to harden them not only maintains the corrosion resistance of the products, but also improves the wear resistance of the products. It is widely used in the field of machinery manufacturing, and the martensitic stainless steel nitrocarburizing process There is no precedent. However, in some special occasions, such as the flat valve assembly of an aircraft, there are several parts in the assembly that need to be made of martensitic stainless steel and then subjected to nitrocarburizing to meet the requirements of use. Otherwise, the safety of the aircraft will be damaged. Difficult to guarantee. Contents of the invention [0003] The invention provides a martensitic stainless steel ...

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
IPC IPC(8): C23C8/56C23C8/02C21D1/18C23C22/50
Inventor 郑雄彭涛
Owner SICHUAN LINGFENG AVIATION HYDRAULIC MACHINERY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com