Bainite steel rail and preparation method thereof

A bainite and bainitic ferrite technology, applied in the field of rail materials, can solve the problems of inability to obtain stress indicators, hidden dangers of driving safety, rail bending, etc., and achieve the effects of excellent service safety and excellent toughness and toughness.

Active Publication Date: 2017-02-22
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The continuous improvement of the axle load and transport volume of railways has put forward higher requirements for the service performance of steel rails. Heavy-duty railways with an annual transport volume of more than 200 million tons, especially small curve radius sections, have become the hardest hit areas for rail damage. Rail service The service life usually does not exceed 3 years, and some road sections with harsh conditions are even less than one year, which is difficult to match with adjacent straight sections and large-radius curved road sections. Frequent replacement of rails not only greatly increases the maintenance cost of the line and the labor intensity of workers, but also causes rapid damage Development also brings serious hid

Method used

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  • Bainite steel rail and preparation method thereof
  • Bainite steel rail and preparation method thereof
  • Bainite steel rail and preparation method thereof

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[0029] According to the second aspect of the present invention, the present invention also provides a method for preparing the above-mentioned bainitic steel rail, the method comprising: rolling the heat-preserving steel billet to obtain a waste heat steel rail, and the tread center of the waste heat steel rail is cooled to After the center temperature of the rail head tread is 350-370℃, the obtained residual heat steel rail is tempered at 375-405℃ for 4-8h, and then cooled to room temperature in air.

[0030] According to the method of the present invention, based on the weight of the steel billet, the steel billet contains 0.20-0.30% by weight of C, 1.40-1.60% by weight of Si, 1.85-2.05% by weight of Mn, and 1.00%-1.25% by weight. Cr, 0.30%-0.50% by weight of Mo, 0.07%-0.09% by weight of V, and satisfying 3.1% by weight≤Mn+Cr≤3.3% by weight.

[0031] According to the method of the present invention, the steel billet with the above composition can be obtained by conventional metho...

Example Embodiment

[0047] Example 1-6

[0048] Examples 1-6 are used to illustrate the method for preparing the bainite rail provided by the present invention.

[0049] The steel billets A1-A6 in Table 1 were cast into continuous casting billets with a certain cross-sectional size after converter smelting, LF furnace refining, and RH vacuum treatment, and then sent to a walking heating furnace to be heated to 1250°C for 4h. The billet is rolled into a 60kg / m section rail, the obtained waste heat rail is erected on the roller table and then left standing in the air for air cooling. When the temperature of the tread center of the waste heat rail drops to the end temperature of the air cooling after rolling in Table 2, it is quickly reduced The steel rail is tempered in a tempering furnace, and the tempering temperature and time are shown in Table 2. After that, take it out and continue air cooling to room temperature.

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Abstract

The invention relates to the field of steel rail materials and discloses a bainite steel rail and a preparation method thereof. On the basis of the weight of the bainite steel rail, the content of a bainite ferrite strip in a microscopic structure of a fillet part on a rail head of the bainite steel rail is more than or equal to 90wt% and the width of the bainite ferrite strip is 0.3-0.8 mu m; the content of a film-shaped retained austenite is less than or equal to 5wt% and the width of the film-shaped retained austenite is less than 0.1 mu m; the content of martensite is less than or equal to 5wt%; the chemical components of the billet steel of the acquired bainite steel rail meet the following conditions: on the basis of the weight of the bainite steel rail, the billet steel contains 0.20-0.30wt% of C, 1.40-1.60wt% of Si, 1.85-2.05wt% of Mn, 1.00-1.25wt% of Cr, 0.30-0.50wt% of Mo and 0.07-0.09wt% of V, wherein Mn+Cr is more than or equal to 3.1wt% but less than or equal to 3.3wt%. The bainite steel rail has excellent toughness performance and service safety.

Description

technical field [0001] The invention relates to rail materials, in particular to a bainite rail and a preparation method thereof. Background technique [0002] The continuous improvement of the axle load and transportation volume of railways has put forward higher requirements for the service performance of steel rails. Heavy-duty railways with an annual transportation volume of more than 200 million tons, especially small curve radius sections, have become the hardest hit areas for rail damage. Rail service The service life usually does not exceed 3 years, and some road sections with harsh conditions are even less than one year, which is difficult to match with adjacent straight sections and large-radius curved road sections. Frequent replacement of rails not only greatly increases the maintenance cost of the line and the labor intensity of workers, but also causes rapid damage Development also brings serious hidden dangers to traffic safety. After more than 100 years of d...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/18C22C38/12C21D9/04
CPCC21D9/04C21D2211/001C21D2211/002C21D2211/008C22C38/02C22C38/04C22C38/12C22C38/18
Inventor 韩振宇邹明郭华汪渊邓勇袁俊
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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