阅读说明：本技术 一种新轨头廓形钢轨及其生产方法 (Novel head profile steel rail and production method thereof ) 是由 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 于 2020-05-15 设计创作，主要内容包括：本发明公开了一种新轨头廓形钢轨及其生产方法,提供的新轨头廓形钢轨由钢轨基座和顶部轮廓构成,其中所述钢轨基座为60钢轨基座,所述顶部轮廓为左右对称结构,具备七段圆弧,其中中间圆弧的半径为200mm,从中间向两边方向上的圆弧的半径分别为60mm、16mm和8mm。提供的新轨头廓形钢轨可以实现轮轨形面匹配,从而延长钢轨的使用寿命。(The invention discloses a new rail head profile steel rail and a production method thereof, wherein the new rail head profile steel rail comprises a steel rail base and a top profile, wherein the steel rail base is a 60 steel rail base, the top profile is of a bilateral symmetry structure and is provided with seven sections of circular arcs, the radius of the middle circular arc is 200mm, and the radiuses of the circular arcs in the directions from the middle to two sides are respectively 60mm, 16mm and 8 mm. The profile of the profile steel rail with the new rail head can realize the profile matching of the wheel rail, thereby prolonging the service life of the steel rail.)

1. A new rail head profile steel rail is composed of a steel rail base and a top profile, wherein the steel rail base is a 60 steel rail base, and the new rail head profile steel rail is characterized in that the top profile is of a bilateral symmetry structure and is provided with seven sections of circular arcs, wherein the radius of the middle circular arc is 200mm, and the radiuses of the circular arcs in the directions from the middle to two sides are 60mm, 16mm and 8mm respectively.

2. The new nose profile rail according to claim 1, characterized in that said top profile has a width of 73mm, the intermediate circular arc has a width of 18mm, and the distance between the junction of the two circular arcs with a radius of 60mm and a radius of 16mm on one side and the junction of the two circular arcs with a radius of 60mm and a radius of 16mm on the other side is 51.07 mm.

3. A method of producing a new profiled steel rail according to claim 1 or 2, comprising the following steps: the method comprises the following steps of molten iron pretreatment, converter smelting, LF furnace refining, VD vacuum degassing, continuous casting, casting blank sulfur printing and low-power rolling, and is characterized in that:

in the molten iron pretreatment process, the fluctuation range of the P content in the molten iron is 0.146-0.148%, and the S content is 0.051%;

the converter smelting process adopts medium carbon steel at the converter end point, the carbon content of converter tapping is in the range of 0.08-0.11%, and the P content of the converter tapping is in the range of 0.009-0.013%;

in the VD vacuum degassing process, the soft blowing time of VD vacuum treatment is more than 15min, the average time is 19min, and the sedation time after soft blowing is 21-35min, the average time is 28 min;

in the continuous casting process, the superheat degree of the continuous casting molten steel is between 16 and 25 ℃, and a constant drawing speed of 0.6 to 0.7m/min is adopted;

the initial rolling temperature in the rolling process is controlled to be 1100-1130 ℃, and the heating system is as follows: the soaking section is 1100-1280 ℃, the heating section I is less than or equal to 1200 ℃, the heating section II is 1000-1300 ℃, the preheating section is less than or equal to 800 ℃, and the tapping temperature is 1080-1150 ℃; the hole pattern system in the rolling process is selected from a hole pattern system of 1 box-shaped hole, 1 trapezoid hole, 3 cap-shaped holes, 3 rolling holes, 3 universal holes, 2 rolled edges and 1 semi-universal hole; the rolling pass distribution is 7-3, and the roll pass arrangement inclination is 2-8%.

Technical Field

The invention belongs to the technical field of metal materials, particularly relates to a new-profile steel rail and a production method thereof, and particularly relates to a 60N new-profile steel rail with a rail head profile matched with the profile of a railway wheel and a production method thereof.

Background

As shown in figure 1, the structural schematic diagram of the currently-in-service 60kg/m (60) steel rail is shown, the structural schematic diagram adopts a symmetrical structural design, the height is 48.5mm, the width is 73mm, two sides of a steel rail base are respectively designed into two sections of circular arcs, and the radiuses of the circular arcs are respectively 8mm and 25 mm. The joint of the extending part of the steel rail base and the top contour is an arc with the radius of 2mm, the top contour is designed into a symmetrical five-section arc, the radius of the middle arc is 300mm, the width of the middle arc is 20mm, and the radii of the arcs from the middle to the two sides are respectively 80mm and 13 mm. However, the profile of the wheel and rail using the steel rail is not matched, which is mainly reflected in that the contact light band of the wheel and rail is not at the center of the designed tread of the rail head but is biased to the track pitch angle, as shown in fig. 2, simulation calculation and analysis (with the curve radius of 600m) are carried out on the 60 steel rail profile surfaces, and it can be seen that the contact point of the steel rail is contacted near the track pitch angle R13, which causes the strip and block of the track pitch angle of the steel rail to be stripped and even causes fatigue core damage, thereby affecting the driving safety, and causing severe wear of the wheel and rail and affecting the service life.

Disclosure of Invention

In view of one or more of the problems in the prior art, an aspect of the present invention provides a new rail head profile steel rail, which comprises a steel rail base and a top profile, wherein the steel rail base is a 60-rail base, the top profile is a bilateral symmetry structure and has seven arcs, the radius of the middle arc is 200mm, and the radii of the arcs in the directions from the middle to the two sides are 60mm, 16mm and 8mm, respectively.

The width of the top contour is 73mm, the width of the middle circular arc is 18mm, and the distance between the junction of the two circular arcs with the radius of 60mm and the radius of 16mm on one side and the junction of the two circular arcs with the radius of 60mm and the radius of 16mm on the other side is 51.07 mm.

In another aspect of the present invention, there is provided a method for producing the new steel rail with a profile, comprising the steps of: the method comprises the following steps of molten iron pretreatment, converter smelting, LF furnace refining, VD vacuum degassing, continuous casting, casting blank sulfur printing and low-power rolling, wherein the method comprises the following steps:

in the molten iron pretreatment process, the fluctuation range of the P content in the molten iron is 0.146-0.148%, and the S content is 0.051%;

the converter smelting process adopts medium carbon steel at the converter end point, the carbon content of converter tapping is in the range of 0.08-0.11%, and the P content of the converter tapping is in the range of 0.009-0.013%;

in the VD vacuum degassing process, the soft blowing time of VD vacuum treatment is more than 15min, the average time is 19min, and the sedation time after soft blowing is 21-35min, the average time is 28 min;

in the continuous casting process, the superheat degree of the continuous casting molten steel is between 16 and 25 ℃, and a constant drawing speed of 0.6 to 0.7m/min is adopted;

the initial rolling temperature in the rolling process is controlled to be 1100-1130 ℃, and the heating system is as follows: the soaking section is 1100-1280 ℃, the heating section I is less than or equal to 1200 ℃, the heating section II is 1000-1300 ℃, the preheating section is less than or equal to 800 ℃, and the tapping temperature is 1080-1150 ℃; the hole pattern system in the rolling process is selected from a hole pattern system of 1 box-shaped hole, 1 trapezoid hole, 3 cap-shaped holes, 3 rolling holes, 3 universal holes, 2 rolled edges and 1 semi-universal hole; the rolling pass distribution is 7-3, and the roll pass arrangement inclination is 2-8%.

The new rail head profile steel rail provided based on the technical scheme is designed on the basis of the traditional 60 steel rail, the rail head profile is redesigned according to the wheel profile, the profile matching of the wheel rail can be realized, and the service life of the steel rail is prolonged. Besides the size of the crown part of the rail, the designed new rail head contour steel rail is completely the same as the 60kg/m steel rail, and has high compatibility.

Drawings

FIG. 1 is a schematic structural view of a 60-rail known in the prior art;

FIG. 2 is a diagram of the effect of contact point simulation using a prior art 60-rail;

FIG. 3 is a schematic structural diagram of a 60N steel rail provided by the present invention;

fig. 4 is a diagram showing the simulation effect of the contact point of the 60N steel rail provided by the invention.

Detailed Description

The present invention will be described in detail below with reference to specific examples.