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

Heat treatment method of steel piece surface

A heat treatment method and technology for steel parts, which are used in metal material coating processes, coatings, solid-state diffusion coatings, etc. The effect of comprehensive service life, reduction of workpiece deformation, and reduction of production costs

Inactive Publication Date: 2019-06-04
郝文龙
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Only the improvement of the surface hardness and wear resistance of the parts is limited. In addition, due to the temperature A higher value will cause greater deformation of the part and a greater amount of subsequent processing

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0010] The following embodiments are further provided in conjunction with the contents of the present invention:

[0011] Taking cylindrical steel parts as an example, the center of the outer circle is 160mm, the inner circle is 100mm smaller, and the height is 230mm. On the upper part of the outer circle, grooves with a width of 30mm, a depth of 10mm and a length of 40mm are evenly distributed along the circumferential direction. The material is 20 carbon structural steel, and the surface hardness is > 700HV , The depth of the infiltration layer is required to be 0.3mm. Parts are processed in a sealed well-type furnace. The first stage is carbonitriding. The infiltration agent can be methanol, acetone and ammonia, and the temperature is 830°C. After three hours, it starts to cool down to 620°C for austenitic nitriding. hours, control the nitrogen decomposition rate to 70%, and obtain an austenite layer with high nitrogen content; then quench and stay in an austenitic quenchin...

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 heat treatment method of a steel piece. The heat treatment method is characterized by comprising the steps: after being loaded into a furnace, the workpiece is carburized atthe temperature of 840-920 DEG C, and the carbon potential is controlled; after the predetermined seepage layer depth is reached, the workpiece is cooled along with the furnace to the range of 620-720DEG C to be subjected to austenitic nitriding; gas is decomposed through ammonia or ammonia hydrogenation, and the nitrogen decomposition rate, furnace gas components and the temperature are controlled; firstly, the workpiece is heated to be in an austenitic state to be subjected to nitriding or carbonitriding, and a predetermined seepage layer is obtained; then the temperature is decreased to bethe austenitic nitriding temperature of 560-640 DEG C in the same furnace for nitriding or carbonitriding treatment, and thus the nitrogen concentration of surface layer austenite of the workpiece isincreased to the level of an austenitic nitriding layer; and then direct quenching and aging within the range of 200-300 DEG C or direct isothermal quenching in the temperature interval of 200-300 DEG C is conducted.

Description

technical field [0001] The present invention relates to an improvement of a heat treatment method. Background technique [0002] At present, carburizing or carbonitriding is commonly used in the heat treatment process of steel parts. It has high hardness and wear resistance, the highest hardness is 56-62HRC, equivalent to 600-750HV, and it can obtain lower martensite (or bainite, sorbite) and other structures, with certain toughness , so it has been widely used. Only the improvement of the surface hardness and wear resistance of the parts is limited. In addition, due to the temperature A higher value will cause greater deformation of the part and a greater amount of subsequent processing. In order to increase the effective hardened layer depth of steel parts after heat treatment; after continuous exploration and research, it is believed that the composite heat treatment method of increasing the depth of austenitic nitriding / nitrocarburizing layer and reducing deformation ...

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): C23C8/34C23C8/80
Inventor 郝文龙
Owner 郝文龙
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