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

20Cr2Ni4A steel carburizing and nitrocarburizing multiplex heat treatment process

A composite heat treatment, nitrocarburizing technology, applied in metal material coating process, coating, solid diffusion coating and other directions, can solve the problem that the performance of 20Cr2Ni4A steel cannot be fully utilized, and it does not meet the requirements of energy saving and emission reduction, efficient production, and production cycle. Long and other problems, to achieve the effect of reducing energy consumption, excellent overall product performance, and short production cycle

Inactive Publication Date: 2011-04-20
JIANGSU AIRSHIP GEAR
View PDF4 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still two major deficiencies in the above-mentioned process. One is that only carburizing treatment can not give full play to the performance of 20Cr2Ni4A steel; secondly, the process is heated multiple times, the production cycle is long, each batch of process flow is long, the process is complicated, and time-consuming about 40 hours
This process does not meet the requirements of contemporary energy saving, emission reduction and efficient production

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

[0025] The present invention is a kind of 20Cr2Ni4A steel carburizing and nitrocarburizing composite heat treatment process, and the specific technological process is carried out according to the following steps:

[0026] (1) First put the parts made of 20Cr2Ni4A steel into the carburizing furnace. The parts in this example are gears, which are carburized by gas. After the furnace is installed, the temperature is raised to 920°C±5°C. Carburize for 6 hours, then take it out of the furnace and air cool;

[0027] (2) Next, send the carburized gear into a heat treatment furnace with a furnace temperature of 590°C±10°C, undergo 5 hours of gas nitrocarburizing treatment, and then raise the temperature to 800°C±10°C with the furnace, and hold it for 3 hours After oil cooling and quenching;

[0028] (3) Finally, put the quenched gear into the furnace for low-temperature tempering treatment. The furnace temperature is 190°C±10°C, keep it warm for 3 hours, and then air-cool with the fu...

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 20Cr2Ni4A steel carburizing and nitrocarburizing multiplex heat treatment process, which comprises the following process flows of: putting components made of 20Cr2Ni4A steel into a carburizing furnace, carburizing at the temperature of between 900 and 930 DEG C for 4.5 to 6 hours, discharging and performing air cooling; performing heat treatment on the carburized components in a furnace at the temperature of between 560 and 600 DEG C, performing gaseous nitrocarburizing treatment for 3 to 5 hours, raising the temperature to between 780 and 840 DEG C together with the furnace, keeping the temperature for 2 to 4 hours, and performing oil quenching; and finally charging the quenched components in the furnace for low-temperature tempering at the temperature of between 160 and 200 DEG C, keeping the temperature for 3 to 4 hours, and performing air-cooling together with the furnace. Due to the carburizing and nitrocarburizing multiplex heat treatment, the hardness on the surfaces of the components is greatly improved, and the abrasion resistance, fatigue strength and corrosion resistance are enhanced. In addition, the component heating frequency is low, so the energy consumption is greatly reduced and the work efficiency is doubled.

Description

technical field [0001] The invention relates to a metal heat treatment process, in particular to a 20Cr2Ni4A steel carburizing and nitrocarburizing composite heat treatment process. Background technique [0002] 20Cr2Ni4A steel is a commonly used alloy surface hardening structural steel. This material has good strength and toughness. It is the main material for manufacturing important parts such as high-strength gears, shafts, spline shafts and piston pins. Parts made of 20Cr2Ni4A steel can significantly improve its surface hardness, wear resistance and fatigue limit after carburizing, while its core still maintains high strength and toughness. The existing 20Cr2Ni4A steel carburizing process is mainly carried out according to the five major processes of carburizing, normalizing, high temperature tempering, quenching and low temperature tempering. This process is a mature process and has been widely used in the production field. "Coal Technology" Volume 19, Issue 3, publish...

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): C23F17/00C23C8/34
Inventor 陆小兵周智慧
Owner JIANGSU AIRSHIP GEAR
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