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High-carbon high-strength tough pearlitic steel rail and production method thereof

A pearlitic rail, high-strength and toughness technology, applied in the direction of manufacturing tools, metal rolling, temperature control, etc., can solve the problems of poor performance of pearlitic rails, achieve low equipment requirements, simple operation, and improve the comprehensive performance of strength and toughness Effect

Active Publication Date: 2018-02-09
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: in the prior art, the rails are heat-treated by means of different cooling rates in different temperature ranges, and the obtained pearlitic rails have poor performance

Method used

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  • High-carbon high-strength tough pearlitic steel rail and production method thereof
  • High-carbon high-strength tough pearlitic steel rail and production method thereof
  • High-carbon high-strength tough pearlitic steel rail and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～6

[0038] Embodiments 1-6 use the method of the present invention to manufacture pearlitic steel rails

[0039] The chemical composition of the pearlitic rail billets used in Examples 1 to 6 is shown in Table 1 below:

[0040] The chemical composition list (%) of pearlitic rail billet of table 1

[0041]

C

Si

mn

P

S

Cr

V / Ti / Nb

Example 1

0.96

0.37

0.59

0.011

0.005

0.37

0.008Ti

Example 2

0.91

0.43

0.90

0.008

0.004

0.20

0.09V

Example 3

1.05

0.34

0.50

0.012

0.006

0.40

0.04Nb

Example 4

0.94

0.50

0.72

0.009

0.004

0.32

0.07Nb

Example 5

0.86

0.29

0.76

0.010

0.003

0.28

0.026Ti

Example 6

0.98

0.20

0.84

0.010

0.005

0.25

0.03V

[0042] Roll the billets shown in the above table into 60kg / m rails, and cool them in the following way:

[0043] a. Rail rolling

[0044] Hot rolling the bil...

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Abstract

The invention belongs to the technical field of production of steel rails and particularly relates to a high-carbon high-strength tough pearlitic steel rail and a production method thereof. In order to solve the problems of non-uniform section performance and low performance of the pearlitic steel rail produced by the prior art, the invention provides a production method of a high-carbon high-strength tough pearlitic steel rail. The method comprises the following steps: a, hot rolling a steel billet into a steel rail, wherein the final rolling temperature is 900-1000 DEG C; and b, spraying cooling media to the top surface of the rail head, two sides of the rail head and low jaws of the two sides of the rail head when the temperature of the center of the top surface of the steel rail is cooled to 800-850 DEG C through air, cooling till the temperature of the center of the top surface is 480-530 DEG C, and cooling through air to the room temperature. Through manners of controlling the steel components and carrying out two-stage accelerated cooling, the high-carbon steel rail with higher strength and high toughness can be produced; the produced steel rail is applied to heavy haul railways.

Description

technical field [0001] The invention relates to a steel rail, more specifically, to a high-carbon, 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 secti...

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
CPCB21B37/74C21D8/005C21D9/04C22C38/02C22C38/04C22C38/24C22C38/26C22C38/28C21D2211/009C21D1/667C21D2211/001C21D2211/003C21D2211/005B21B1/085B21B1/22B21B2001/225
Inventor 韩振宇邹明郭华袁俊
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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