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

Alloy vermicular cast iron for railway vehicle brake disc and its melting method

A technology of vermicular graphite cast iron and railway vehicles, which is applied in the field of alloy vermicular graphite cast iron, can solve the problems of poor working environment of brake discs, enlarged brake discs, etc., so as to reduce section sensitivity, improve strength, and increase tensile strength. Effect

Active Publication Date: 2018-03-13
CHANGZHOU LANGRUI CASTING +1
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as a large number of 160km / h speed-up trains gradually run, the working environment of the brake disc is even worse, and the tendency of cracks and expansion of the brake disc due to the alternation of heat and cold during work is further increased, which cannot meet the use requirements.

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
  • Alloy vermicular cast iron for railway vehicle brake disc and its melting method
  • Alloy vermicular cast iron for railway vehicle brake disc and its melting method
  • Alloy vermicular cast iron for railway vehicle brake disc and its melting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0018] An alloy vermicular graphite cast iron for a railway vehicle brake disc according to the present invention, the chemical composition of the vermicular graphite cast iron includes: C: 3.3-3.5%, Si: 2.3-2.5%, Mn: 0.4- 0.7%, Cu: 0.6~1.0%, Mo: 0.2~0.6%, Ni: 0.6~1.0%, P≤0.07%, S≤0.02%, and the balance of Fe, among them, the vermicular The conversion rate is ≥75%, and the pearlite content is 50% to 60%.

[0019] In the present invention, the C content is designed at 3.3-3.5%. By controlling the carbon content, it can not only increase the amount of worm-like graphite precipitated, but also reduce the tendency of shrinkage and shrinkage porosity. The increase in the amount of graphite resulted in an increase in pearlite reduction and a decrease in the problem. In the present invention, the Si content is designed at 2.3-2.5%, which can increase and reduce the content of pearlite, strengthen ferrite, and have a tendency to increase the amount of graphite, increase tensile stren...

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 relates to an alloy vermicular cast iron for a railway vehicle brake disc and a melting method thereof. The chemical composition of the vermicular cast iron, in terms of mass percentage, includes: C: 3.3-3.5%, Si: 2.3-2.5%, Mn: 0.4~0.7%, Cu: 0.6~1.0%, Mo: 0.2~0.6%, Ni: 0.6~1.0%, P≤0.07%, S≤0.02%, and the balance of Fe, among them, vermicular graphite cast iron brake disc The creep rate is ≥75%, and the pearlite content is 50%-60%. The invention can increase the stress threshold value of disc cracking and expansion caused by thermal stress concentration, and improve the mechanical properties of the railway vehicle brake disc.

Description

technical field [0001] The invention relates to an alloy vermicular graphite cast iron for a railway vehicle brake disc and a melting method thereof, belonging to the technical field of alloy vermicular graphite cast iron. Background technique [0002] At present, the braking system of railway vehicles is widely adopting the brake disc braking method. In this braking method, more than 90% of the heat is absorbed by the brake disc during the braking process. It will experience rapid heating and strong convective cooling in a short period of time, which will inevitably cause the brake disc to bear high thermal load and thermal stress during the braking process. Therefore, rail vehicle brake disc materials must have good high-temperature mechanical properties, thermal fatigue resistance, stable thermal strength and certain oxidation resistance. [0003] Traditional railway vehicle brake discs are generally made of gray cast iron. Gray cast iron has the characteristics of high ...

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 Patents(China)
IPC IPC(8): C22C37/10C22C33/08C21C1/08
Inventor 谢达昕封雪平张棣鲍飞张军
Owner CHANGZHOU LANGRUI CASTING
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