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Novel railhead profile steel rail and production method thereof

A technology of rail and rail head, which is applied to the 60N new rail head profile rail and its production field, can solve the problems of affecting the service life, fatigue nuclear damage, wheel and rail wear, etc., and achieve the effect of prolonging the service life and high compatibility

Inactive Publication Date: 2020-09-22
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the wheel-rail profile using this rail is mismatched, mainly manifested in the fact that the wheel-rail contact light strip is not at the center of the designed rail head tread surface, but is biased towards the gauge angle, such as figure 2 As shown, the simulation calculation and analysis of the 60 rail profile (curve radius is 600m), it can be seen that the rail contact point contacts near the gauge angle R13, which will cause the rail gauge angle to peel off blocks or even cause fatigue nuclear damage, thus Affect driving safety, and cause severe wheel and rail wear, affecting service life

Method used

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  • Novel railhead profile steel rail and production method thereof
  • Novel railhead profile steel rail and production method thereof
  • Novel railhead profile steel rail and production method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Example 1: New Rail Head Profile Rail

[0018] Such as image 3 As shown, the schematic diagram of the cross-sectional structure of the new rail head profile rail (60N rail) provided by the present invention is shown, which can be based on the base of the 60N rail, and the difference is that the top profile has seven arcs, The radius of the middle arc is 200 mm, and the radii of the arcs from the middle to both sides are 60 mm, 16 mm, and 8 mm, respectively. The width of the top profile is still 73mm, but the width of the middle arc is reduced to 18mm, and the two arcs with a radius of 60mm and a radius of 16mm meet at the junction of two arcs with a radius of 60mm and a radius of 16mm on the other side The distance between the junctions is 51.07mm. The new rail head profile rail provided in this embodiment is designed based on the traditional 60 rail, and the rail head profile is redesigned according to the wheel profile, which can implement wheel-rail profile matchi...

Embodiment 2

[0019] Embodiment 2: the production method of new rail head profile rail

[0020] The molten iron composition that the new rail head profile steel rail that the present invention adopts is identical with the molten iron composition that produces 60 rails in the prior art, for example can adopt U75V rail steel, and concrete production process comprises the following steps:

[0021] 1) Pretreatment of molten iron: the fluctuation range of P content in the molten iron composition is 0.146% to 0.148%, the S content is 0.051%, and the fluctuation range of P and S content is small, which can meet the smelting requirements.

[0022] 2) Converter smelting: medium-carbon drawn steel is used at the end of the converter, the carbon content of the steel tapped from the converter ranges from 0.08% to 0.11%, and the P content of the tapped steel ranges from 0.009% to 0.013%.

[0023] 3) LF furnace refining: According to production requirements, LF uses medium alkalinity and strong reducing ...

example 1

[0052]This example adopts the new rail head profile steel rail that above-mentioned embodiment 2 obtains to carry out wheel-rail contact point simulation calculation and analysis (curve diameter 600m), the result is as follows Figure 4 As shown, it can be seen that when the curve radius of the newly designed profile rail 60N rail of the present invention is 600m, the contact point of the 60N upper strand rail is obviously centered. Compared with the 60N rail, under the curve conditions of R600m and H70mm, the maximum contact stress of the 60N upper strand rail 21% reduction and 9% reduction in Mises stress.

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PUM

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Abstract

The invention discloses a novel railhead profile steel rail and a production method thereof. The novel railhead profile steel rail is composed of a steel rail base and a top outline. Specifically, thesteel rail base is a 60 steel rail base, the top outline is of a bilateral symmetry structure and is provided with seven sections of arcs, the radius of a middle arc is 200mm, and the radiuses of thearcs in the direction from the middle to the two sides are 60mm, 16mm and 8mm respectively. According to the novel railhead profile steel rail, wheel-rail profile matching can be achieved, thereforethe service life of the steel rail is prolonged.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and in particular relates to a new rail head profile rail and a production method thereof, in particular to a 60N new rail head profile rail with a rail head profile matching the rail wheel profile and its method of production. Background technique [0002] Such as figure 1 As shown, it shows the schematic diagram of the structure of the 60kg / m (60) rail currently in service. It adopts a symmetrical structure design, with a height of 48.5mm and a width of 73mm. The two sides of the rail base are designed with two circular arcs. The radii of the arcs are 8mm and 25mm, respectively. The connection between the rail base and the extension of the top profile is a circular arc with a radius of 2mm. The top profile is a symmetrical five-section circular arc design. The radius of the middle arc is 300mm, and the width of the middle arc is 20mm. The radii of the arcs from the middle to both sid...

Claims

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Application Information

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IPC IPC(8): E01B5/02B21B37/74C22C33/04
CPCB21B37/74C22C33/04E01B5/02
Inventor 苏航梁正伟涛雅郑瑞薛虎东王慧军赵桂英边影董捷王嘉伟
Owner BAOTOU IRON & STEEL GRP
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