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High-strength and toughness hypereutectoid steel rail and manufacturing method thereof

A manufacturing method and hypereutectoid technology, applied in the field of rail manufacturing, can solve problems such as poor performance of pearlitic rails and difficulty in uniform cooling, and achieve the effects of low equipment requirements, excellent strength, and extended service life

Active Publication Date: 2018-02-27
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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  • High-strength and toughness hypereutectoid steel rail and manufacturing method thereof
  • High-strength and toughness hypereutectoid steel rail and manufacturing method thereof
  • High-strength and toughness hypereutectoid steel rail and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～6

[0051] Embodiments 1-6 use the method of the present invention to manufacture hypereutectoid rails

[0052] The chemical composition of the hypereutectoid rail billets used in Examples 1 to 6 is shown in Table 1 below:

[0053] The chemical composition table (%) of table 1 rail billet

[0054]

C

Si

mn

P

S

Cr

V / Ti / Nb

Example 1

1.02

0.31

0.79

0.011

0.003

0.57

0.02V

Example 2

0.99

0.20

0.90

0.010

0.004

0.51

0.06Nb

Example 3

0.90

0.37

0.85

0.011

0.004

0.44

0.018Ti

Example 4

0.97

0.42

0.92

0.009

0.005

0.38

0.08V

Example 5

0.92

0.50

0.95

0.010

0.003

0.30

0.030Ti

Example 6

1.05

0.25

0.70

0.012

0.004

0.60

0.02Nb

[0055] Roll the slabs shown in the above table into 75kg / m rails, and cool them in the following way:

[0056] b. The first stage of cooling

[0057] Utilizing the re...

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Abstract

The invention belongs to the technical field of steel rail manufacturing and particularly relates to a high-strength and toughness hypereutectoid steel rail and a manufacturing method thereof in orderto solve the problems that the fracture surfaces of the rail heads of a hypereutectoid steel rail prepared in the prior art is not uniform in performance, and the obtained hypereutectoid steel rail is poor in performance. The manufacturing method of the high-strength and toughness hypereutectoid steel rail, provided by the invention, comprises the following steps of a, hot-rolling a steel billetinto a steel rail; b, cooling the top surface of the rail heads and the two side faces of the rail heads until the temperature of the center of the top surface reaches 700 DEG C when the temperature of the center of the top surface of the steel rail is air-cooled to 820 DEG C; and c, cooling the top surface, the two side faces and the lower jaws of the two sides of the rail heads until the surfacetemperature of the rail heads reaches 530-550 DEG C, cooling the top surfaces and the two side faces of the rail heads to 450-480 DEG C and air-cooling the rail heads to the indoor temperature. The steel rail with more excellent performance is prepared through control over steel ingredients in a three-stage accelerated cooling method and is suitable for heavy haul railways.

Description

technical field [0001] The invention belongs to the technical field of rail manufacturing, and in particular relates to a high-strength and tough hypereutectoid 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-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/04C22C38/02C22C38/04C22C38/24C22C38/26C22C38/28
CPCC21D9/04C21D2211/009C22C38/02C22C38/04C22C38/24C22C38/26C22C38/28
Inventor 韩振宇邹明郭华袁俊
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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