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Internal-damage-resistant pearlite steel rail and manufacturing method thereof

A technique for pearlitic steel rails and manufacturing methods, which is applied in the field of steel rail manufacturing, can solve problems such as difficult uniform cooling and poor performance of pearlitic steel rails, and achieve the effects of low equipment requirements, improved internal damage resistance, and simple operation

Active Publication Date: 2018-02-23
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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  • Internal-damage-resistant pearlite steel rail and manufacturing method thereof
  • Internal-damage-resistant pearlite steel rail and manufacturing method thereof
  • Internal-damage-resistant pearlite steel rail and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～8

[0051] Embodiments 1-8 use the method of the present invention to manufacture pearlitic steel rails

[0052] The chemical composition of the pearlitic rail billet used in Examples 1-8 is shown in Table 1 below:

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

[0054]

C

Si

mn

P

S

Cr

V / Ti / Nb

Example 1

0.73

0.64

1.00

0.009

0.009

0.35

0.04V

Example 2

0.84

0.69

0.79

0.012

0.008

0.42

0.02Nb

Example 3

0.70

0.80

0.88

0.011

0.004

0.50

0.014 Ti

Example 4

0.78

0.74

0.72

0.008

0.005

0.47

0.07Nb

Example 5

0.82

0.77

0.85

0.006

0.005

0.25

0.08V

Example 6

0.88

0.65

0.65

0.010

0.006

0.31

0.05Nb

Example 7

0.85

0.60

0.68

0.011

0.004

0.20

0.026Ti

Example 8

0.79

0.72

0.81

0.010

0.007

0.39

0.06V

[0055] R...

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Abstract

The invention belongs to the technical field of steel rail manufacturing and particularly relates to an internal-damage-resistant pearlite steel rail and a manufacturing method thereof. For the problems that the performance of an on-line heat treatment pearlitic steel rail head prepared in the prior art is low in uniformity and poor in internal-damage-resistant performance. The invention providesthe manufacturing method of the internal-damage-resistant pearlitic steel rail. The manufacturing method comprises the following steps: a, conducting hot rolling on a steel billet to form a steel rail; b, when the center temperature of the top surface of the steel rail is air-cooled to 750-800 DEG C, utilizing final rolling waste heat to cool both sides of the rail head until the center temperature of the top surface is 700 DEG C; c, cooling the top surface of the rail head, the two side surfaces of the rail head and the lower jaws of the two sides of the rail head until the temperature of thesurface layer of the rail head is 520 -550 DEG C, then cooling the top surface of the rail head and the two sides of the rail head until the temperature is 400 -450 DEG C, and carrying out air cooling to the room temperature. The steel with better performance is prepared by controlling steel components and three-section accelerated cooling mode. The internal-damage-resistant pearlite steel rail and the manufacturing method are suitable for a large-transport-capacity railway with high requirements on the anti-fatigue performance of the steel rail.

Description

technical field [0001] The invention belongs to the technical field of rail manufacturing, and in particular relates to an internal damage-resistant 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 steel rails is becoming more and more harsh and complex, and various damages are prominent. In some small-ra...

Claims

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Application Information

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Patent Type & Authority Applications(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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