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Contact fatigue resistant pearlitic steel rail and its manufacturing method

A pearlitic rail and contact fatigue technology, applied in the field of rail manufacturing, can solve the problems of difficulty in uniform cooling and poor performance of pearlitic rails, and achieve the effects of low equipment requirements, improved contact fatigue resistance and excellent strength.

Active Publication Date: 2019-05-10
PANGANG GROUP RESEARCH INSTITUTE CO LTD
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  • 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: the pearlitic steel rail prepared in the prior art adopts a one-stage cooling method during cooling, which makes it difficult to uniformly cool down, and the obtained pearlitic steel rail has poor performance

Method used

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  • Contact fatigue resistant pearlitic steel rail and its manufacturing method
  • Contact fatigue resistant pearlitic steel rail and its manufacturing method
  • Contact fatigue resistant pearlitic steel rail and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～6

[0046] Embodiments 1-6 use the method of the present invention to manufacture pearlitic steel rails

[0047] The chemical composition of the pearlitic rail billets used in Examples 1 to 6 is shown in Table 1 below:

[0048] The chemical composition list (%) of pearlitic rail billet of table 1

[0049]

C

Si

mn

P

S

Cr

V / Ti / Nb

Example 1

0.66

0.55

0.96

0.015

0.004

0.09

0.10V

Example 2

0.70

0.38

0.83

0.010

0.005

0.15

0.030Ti

Example 3

0.60

0.42

1.25

0.009

0.003

0.05

0.08Nb

Example 4

0.72

0.10

1.16

0.008

0.004

0.07

0.02V

Example 5

0.75

0.21

0.75

0.009

0.005

0.12

0.001Ti

Example 6

0.63

0.30

1.01

0.012

0.004

0.10

0.03Nb

[0050] Roll the billets shown in the above table into 60kg / m rails, and cool them in the following way:

[0051] a. Rail rolling

[0052] Hot rolling the bill...

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Abstract

The invention belongs to the technical field of steel rail manufacturing, and particularly relates to an anti-contact fatigue pearlite steel rail and a manufacturing method thereof. The method of theanti-contact fatigue pearlite steel rail is provided to solve the problems that the obtained pearlite steel rail is poor in performance and low in anti-contact fatigue resistance due to the fact thatperformance of a fracture surface of a rail head of the pearlite steel rail is not uniform in the prior art. The manufacturing method of the anti-contact fatigue pearlite steel rail comprises the following steps of a, a steel billet is hot-rolled into a steel rail, and final rolling temperature is 900-1000 DEG C; b, when the center temperature of the top surface of the steel rail is air-cooled to750-800 DEG C, cooling mediums are sprayed to the top surface of the rail head and two side surfaces of the rail head, and the center temperature is cooled to 650 DEG C; and c, the cooling mediums aresprayed to the top surface of the rail head, the two side faces of the rail head and the lower jaws on the two sides of the rail head, and the temperature of the surface layer of the rail head is cooled to 520 DEG C, and then is air-cooled to the room temperature. According to the anti-contact fatigue pearlite steel rail and the manufacturing method thereof, the steel rail with better performanceis prepared by modes of controlling the steel component and accelerated cooling two sections, and the method has the advantages of being simple in operation, low in equipment requirement and suitablefor popularization and application.

Description

technical field [0001] The invention belongs to the technical field of rail manufacturing, and in particular relates to an anti-contact fatigue pearlitic 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/28C22C38/26C22C38/24B21B37/74C21D8/00C21D9/04
CPCB21B37/74C21D8/005C21D9/04C21D2211/009C22C38/02C22C38/04C22C38/24C22C38/26C22C38/28
Inventor 韩振宇邹明郭华袁俊
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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