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

Hypereutectoid Rail Waist On-Line Heat Treatment Method and Constraint Device

A technology of heat treatment method and restraint device, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve the problems of large amount of secondary cementite precipitation, no operation process, poor quality control, etc., to reduce residual stress and improve Comprehensive performance, the effect of suppressing the content of secondary cementite

Active Publication Date: 2020-11-10
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
View PDF6 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the cooling of hypereutectoid rails is still in the stage of operation based on the experience of researchers. There is no standardized operation process and clear control indicators, resulting in a large amount of secondary cementite precipitation and uneven quality of rail waists in hypereutectoid rails. Uneven, poor quality control

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
  • Hypereutectoid Rail Waist On-Line Heat Treatment Method and Constraint Device
  • Hypereutectoid Rail Waist On-Line Heat Treatment Method and Constraint Device
  • Hypereutectoid Rail Waist On-Line Heat Treatment Method and Constraint Device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0032] The embodiment of the present invention and the corresponding comparative examples all select the following chemical components of the rail.

[0033] Table 1 Example Rail Chemical Composition / %

[0034]

[0035] The comparative example among the present invention adopts the same chemical composition, heating and rolling process as the embodiment. The single weight of the rail is 75kg / m, the thickness of the rail waist is 20mm, and the temperature of the rail entering the unit is 760°C.

[0036] 1# to 4# are confinement devices using different processes (cooling speed of cooling medium) supplemented by different heat treatment processes, and 5# is a comparative example without heat treatment process. Subsequently, 5 samples were produced by the same heating and rolling process,

[0037] Table 2 Example and Comparative Example Rail Heat Treatment Process and Heat Treatment Constraint Device Used

[0038]

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 an on-line heat treatment method of a rail web for a hypereutectoid steel rail and a restraint device thereof, and belongs to the technical field of metal heat treatment. The on-line heat treatment method comprises the following steps of firstly, controlling the temperature of the steel rail to be at 700 DEG C to 800 DEG C, and detecting the content, in percentage by mass,of carbon in the steel rail; next, sending the steel rail into the restraint device, and applying, by utilizing the restraint device, an accelerative cooling medium to the center of a tread of a railhead of the steel rail, two sides of the railhead and the center of a rail bottom; and finally, when the temperature of the steel rail is decreased to 450 DEG C to 500 DEG C, sending out the steel railfrom the restraint device. The on-line heat treatment method has the beneficial effects that the steel rail is stabilized by utilizing the restraint device; afterwards, the accelerative cooling medium under different pressures is applied to the railhead and the rail bottom of the steel rail according to the content of the carbon in the steel rail; the temperatures of the railhead and the rail bottom are rapidly decreased; the heat at the position of the rail web is caused to rapidly conduct towards two ends; thus, the residual stress of the rail web of the steel rail is decreased; the contentof secondary cementite of a high-carbon steel rail is inhibited; and finally, the overall performance of a weak position of the steel rail is improved.

Description

technical field [0001] The invention relates to the technical field of metal heat treatment, in particular to an on-line heat treatment method for a hypereutectoid rail waist and a constraint device thereof. Background technique [0002] With the gradual development of railways to heavy-haul freight and high-speed passenger transportation, heavy-duty lines have put forward higher requirements for the wear resistance and excellent performance of rails. In order to meet the requirements of heavy-duty lines, hypereutectoid steel rails with a carbon content of ≥0.9% have been developed successively at home and abroad. This steel type has higher strength and toughness, but because it contains secondary cementite, it needs to complete the heating and cooling process. Suppresses the precipitation of reticular secondary cementite content. At present, the cooling of hypereutectoid rails is still in the stage of operation based on the experience of researchers. There is no standardiz...

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): C21D9/04
CPCC21D9/0006C21D9/0062C21D9/04
Inventor 袁俊韩振宇邹明李若曦
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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