High strength tough pearlite steel rail and manufacturing method thereof

A pearlitic steel rail, high strength and toughness technology, applied in the field of steel rails, can solve the problems of poor strength and toughness of pearlitic steel rails, achieve the effects of low equipment requirements, improve comprehensive strength and toughness performance, and simple operation

Active Publication Date: 2017-12-15
PANGANG GROUP RESEARCH INSTITUTE CO LTD
View PDF4 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is: in the prior art, the steel rails are heat-treated by means of different cooling rates in different temperature ranges, resulting in poor strength and toughness of the pearlitic steel rails

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
  • High strength tough pearlite steel rail and manufacturing method thereof
  • High strength tough pearlite steel rail and manufacturing method thereof
  • High strength tough pearlite steel rail and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～8

[0045] Embodiments 1-8 use the method of the present invention to manufacture pearlitic steel rails

[0046] The chemical composition of the pearlitic rail billet used in Examples 1-8 is shown in Table 1 below:

[0047] The chemical composition list (%) of pearlitic rail billet of table 1

[0048]

C

Si

mn

P

S

Cr

V / Ti / Nb

Example 1

0.78

0.15

1.10

0.012

0.005

0.37

0.03V

Example 2

0.72

0.22

0.98

0.011

0.006

0.58

0.017Ti

Example 3

0.65

0.50

1.22

0.009

0.005

0.60

0.09V

Example 4

0.70

0.37

0.93

0.013

0.004

0.41

0.06Nb

Example 5

0.85

0.42

0.82

0.012

0.007

0.15

0.020Ti

Example 6

0.83

0.45

0.75

0.010

0.007

0.28

0.01Nb

Example 7

0.68

0.48

1.25

0.015

0.008

0.65

0.03Nb

Example 8

0.77

0.19

0.79

0.007

0.009

0.19

0.005Ti

[0049] ...

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 belongs to the technical field of steel rail manufacturing and in particular relates to a high strength tough pearlite steel rail and a manufacturing method thereof. In order to solve the problem that the obtained pearlite steel rail is poor in performance as the fracture surface performance of a railhead of the pearlite steel rail in the prior art is not uniform, the invention provides the manufacturing method of the high strength tough pearlite steel rail. The manufacturing method comprises the following steps of: a, performing hot rolling on a steel blank to a steel rail, wherein the finishing temperature is 900-1000 DEG C; b, spraying a cooling medium to the top surface of the railhead and two side faces of the railhead by means of finishing waste heat when the central temperature of the top surface of the steel rail is air-cooled to 800 DEG C and performing cooling till the central temperature of the top surface of the steel rail is 750 DEG C; and c, spraying the cooling medium to the top surface of the railhead, two side faces of the railhead and lower jaws of two sides of the railhead, and performing air-cooling to room temperature after the temperature of the surface layer of the railhead is smaller than or equal to 450 DEG C. By way of control of the components of steel and accelerated cooling in two sections, steel which is more excellent in performance is prepared. The method provided by the invention is simple to operate, not high in equipment demand and suitable for being popularized and used.

Description

technical field [0001] The invention relates to a steel rail, more specifically, to a high-strength and toughness pearlite steel rail and a manufacturing method thereof. Background technique [0002] The rapid development of railways puts forward higher requirements on the service performance of rails. With the continuous improvement of my country's high-speed railway network, the existing mixed passenger and freight trunk lines will gradually implement heavy-duty transformation. Large capacity, large axle load, and high density are the development direction of heavy-duty railways in the future. As a key component of the railway, the quality and performance of the rail are closely related to the transportation efficiency and driving safety of the railway. With the improvement of railway transportation capacity, the service environment of rails is becoming more and more harsh and complex, and various damages are prominent. Some rails in small-radius curved sections also suff...

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 Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/24C22C38/26C22C38/28C21D8/00C21D9/04
CPCC21D8/005C21D9/04C21D2211/009C22C38/02C22C38/04C22C38/24C22C38/26C22C38/28
Inventor 韩振宇邹明郭华袁俊
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap