Strong and tough pearlitic steel rail and its manufacturing method

A pearlitic steel rail, strong toughness technology, applied in the direction of manufacturing tools, temperature control, furnace, etc., can solve the problems of poor performance of pearlitic steel rail, achieve the effect of low equipment requirements, improve the comprehensive performance of strength and toughness, and simple operation

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: in the prior art, the methods of different cooling rates in different temperature ranges are used to heat-treat the rails, and the obtained pearlitic rails have poor performance

Method used

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  • Strong and tough pearlitic steel rail and its manufacturing method
  • Strong and tough pearlitic steel rail and its manufacturing method
  • Strong and tough pearlitic steel rail and its manufacturing method

Examples

Experimental program
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Effect test

Embodiment 1～6

[0044] Embodiments 1-6 use the method of the present invention to manufacture pearlitic steel rails

[0045] The chemical composition of the pearlitic rail billets used in Examples 1 to 6 is shown in Table 1 below:

[0046] The chemical composition list (%) of pearlitic rail billet of table 1

[0047]

[0048]

[0049] Roll the billets shown in the above table into 60kg / m rails, and cool them in the following way:

[0050] a. Rail rolling

[0051] Hot rolling the billet into rail, the final rolling temperature is 900-1000℃;

[0052] b. The first stage of cooling

[0053] When the center temperature of the top surface of the rail is air-cooled to 850°C, spray cooling medium to the top surface of the rail head, both sides of the rail head and the lower jaws on both sides of the rail head, and cool down to a temperature of 630-650°C at the center of the top surface;

[0054] c. Second stage cooling

[0055] Continue to spray the cooling medium, cool down to the surface...

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Abstract

The invention belongs to the technical field of steel rail manufacturing and particularly relates to a tough pearlitic steel rail and a manufacturing method thereof. The invention provides the manufacturing method of the tough pearlitic steel rail for solving the problems that the property of the fracture surface of a pearlitic steel rail head prepared through the prior art is uneven, and the property of the obtained pearlitic steel rail is poor. The manufacturing method comprises the following steps that a, a steel billet is hot-rolled into the steel rail, and the finish rolling temperature is 900-1000 DEG C; b, when the steel rail top surface center temperature is air-cooled to 850 DEG C, cooling media are sprayed to the top surface of the rail head, the two side surfaces of the rail head, and the mandibles of the two sides of the rail head, and cooling is conducted till the top surface center temperature is 630-650 DEG C; and c, cooling media are sprayed continuously, cooling is conducted till the rail head surface layer temperature is 480-500 DEG C, and air cooling is conducted to be the room temperature. According to the tough pearlitic steel rail and the manufacturing methodthereof, through the modes of steel component controlling and two segment accelerated cooling, the steel rail with the more excellent toughness is prepared, and the tough pearlitic steel rail and themanufacturing method thereof are suitable for application of heavy loads and passenger and freight mixed transporting railways.

Description

technical field [0001] The invention relates to a steel rail, more specifically, to a strong and tough 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 suffer from dam...

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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