Steel rail and producing method thereof

A production method and rail technology, applied in the field of metallurgy, can solve the problems of poor resistance to contact fatigue damage, contact fatigue crack damage, hidden dangers of driving safety, etc., achieve good resistance to contact fatigue damage, reduce residual stress, The effect of improving performance

Inactive Publication Date: 2008-03-26
PANZHIHUA IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, on straight sections with fast speeds or large-radius curved sections, the contact fatigue damage of the rail is more prominent than the wear. However, due to the poor resistance to contact fatigue damage of this type of rail, the surface of the rail is prone to contact fatigue cracks Damage, causing hidden danger to driving safety

Method used

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  • Steel rail and producing method thereof
  • Steel rail and producing method thereof

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Experimental program
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Effect test

Embodiment 1

[0028] The steel rail has a chemical composition of C=0.63%, Si=0.22%, Mn=1.05%, Fe=97.95% and other trace elements 0.15%. After the rail is hot-rolled and formed by a universal rolling mill, the residual heat after hot-rolling is used for on-line heat treatment to quench and cool the rail. The temperature before the quenching and cooling of the rail is 750°C, and the quenching and cooling time is 110 seconds. During the quenching and cooling, the rail head 1, the rail waist 2 and the rail bottom 3 of the rail are simultaneously quenched and cooled. By quenching and cooling the rail head 1, rail waist 2, and rail bottom 3 at the same time, the strength of the rail waist 2 and rail bottom 3 can be improved under the condition that the rail head 1 obtains the required structure and performance, so that Improve the overall strength of the rail; at the same time, quenching and cooling the rail head 1, rail waist 2, and rail bottom 3 can reduce the temperature difference between th...

Embodiment 2

[0032] The chemical composition of the steel rail is: C=0.72%, Si=0.31%, Mn=1.25%, Fe=97.54% and 0.18% of other trace elements. After the rail is hot-rolled and formed by a universal rolling mill, the residual heat after hot-rolling is used for on-line heat treatment to quench and cool the rail. The temperature before quenching and cooling of the rail is 790°C, and the quenching and cooling time is 118 seconds. During quenching and cooling, the rail head 1, rail waist 2, and rail bottom 3 of the rail are simultaneously quenched and cooled.

[0033] Wherein, the quenching and cooling intensity of the rail head 1 is greater than that of the rail waist 2 and the rail bottom 3 . As shown in Figure 1, three rows of nozzles 4, 5, 6 are set on the tread of rail head 1, two rows of nozzles 7, 8 and 9, 10 are set on both sides of rail head 1, and two rows of nozzles 7, 8 and 9, 10 are set on both sides of rail waist 2 respectively. A row of nozzles 11 and 12, and a row of nozzles 13 a...

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Abstract

The present invention relates to metallurgy technology, and is especially one kind of steel rail with high contact fatigue resistance and its production process. The steel rail has the chemical composition comprising C 0.61-0.73 %, Si 0.20-0.50 %, Mn 0.80-1.30 %, and Fe and other trace elements for the rest. It has tensile strength Rm over 1080 MPa, fracture toughness KIC over 45 MPa.m1/2, excellent contact fatigue resistance and high comprehensive use effect. Its production process includes the on-line treatment of rolled steel rail, including simultaneous quenching and cooling to the rail head, the rail web and the rail base.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a steel rail and a production method of the steel rail. Background technique [0002] With the development of railway transportation, the running speed of trains has been continuously improved, and the speed of most lines has reached more than 90km / h. When the vehicle speed exceeds 90km / h, the main factor affecting the service life of the rail is no longer wear, but contact fatigue damage. Contact fatigue damage can lead to broken rails, resulting in rollover accidents. Because the contact fatigue damage of the rail seriously endangers the driving safety, it is necessary to develop a rail with excellent contact fatigue resistance. In order to improve the resistance to contact fatigue damage of rails, it is necessary to improve the toughness of rails on the basis of properly ensuring the tensile strength of rails. [0003] The existing steel rails are rolled into steel rails from cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C21D9/04C21D1/667C21D11/00
Inventor 邓建辉梅东生徐权邹明吴雄先郭华王飞龙
Owner PANZHIHUA IRON AND STEEL
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