F type rail used for reducing frictional losses of magnetic-levitation train and preparing method thereof

A friction loss, maglev train technology, applied in tracks, buildings, roads, etc., can solve the problems of increasing the maintenance cost of maglev tracks, thinning of the outer legs of the F-rail, hidden dangers of vehicle safety, etc., so as to improve operation safety and reduce maintenance costs. , The effect of improving performance and service life

Active Publication Date: 2019-10-29
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the physical braking method is used, the brake system on the maglev train will rub against the F rail, and the brake pads will lock with the outer legs of the F rail to generate frictional braking, while the F rail is made of Q235 material with low hardness, so physical braking is often used In the future, the F rail will wear out very quickly, causing the outer legs of the F rail to become thinner, requiring early replacement and maintenance, which will greatly increase the maintenance cost of the maglev track, and will also bring great hidden dangers to vehicle safety.

Method used

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  • F type rail used for reducing frictional losses of magnetic-levitation train and preparing method thereof
  • F type rail used for reducing frictional losses of magnetic-levitation train and preparing method thereof
  • F type rail used for reducing frictional losses of magnetic-levitation train and preparing method thereof

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preparation example Construction

[0035] The invention discloses a method for preparing the F-shaped rail for reducing friction loss of a maglev train, which includes the following processes:

[0036] Hot metal desulfurization: using magnesium powder desulfurization process;

[0037] Converter smelting: adopt top and bottom combined blowing process;

[0038] LF refining outside the furnace: the slag basicity is controlled in the range of 1.6 to 2.0;

[0039] Vacuum treatment: the vacuum treatment time is not less than 20min;

[0040] Continuous casting: During the continuous casting process, the temperature of the tundish is controlled at the liquidus 18~24℃, and the pulling speed is 0.6~1.0m / min. The continuous casting process should be carried out under the protection of the whole process to prevent contact with air. The billet should be slowly cooled;

[0041] Billet heating: use walking beam heating furnace to heat the billet, and conduct heat preservation treatment, the heating temperature is 1200~1260℃, and the he...

Embodiment 1

[0048] This embodiment discloses a method for preparing the above-mentioned F-shaped rail for reducing the friction loss of a maglev train, wherein each chemical component is calculated by mass percentage, including: C: 0.03%, Si: 0.25%, Mn: 1.5% , P: 0.002%, S: 0.002%, Cr: 0.10%, Ni: 0.10%, Nb: 0.02%, B: 0.002%; the balance is Fe and unavoidable impurities.

[0049] The specific accelerated cooling and heat treatment process for the F-shaped steel outer leg is shown in Table 1; the obtained length is 12.5 meters and the specification is F379×101mm.

Embodiment 2

[0051] This embodiment discloses a method for preparing the above-mentioned F-shaped rail for reducing the friction loss of a maglev train, wherein each chemical component is calculated by mass percentage, including: C: 0.09%, Si: 0.40%, and Mn: 2.0% , P: 0.002%, S: 0.002%, Cr: 0.30%, Ni: 0.25%, Nb: 0.06%, B: 0.006%; the balance is Fe and unavoidable impurities.

[0052] The specific accelerated cooling heat treatment process for the F-shaped steel outer leg is shown in Table 1.

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Abstract

The invention discloses an F type rail used for reducing frictional losses of a magnetic-levitation train and a preparing method thereof, and belongs to the technical field of rails for magnetic-levitation track traffic. The F type rail comprises an F type steel rail body, the F type steel rail body is provided with an F type steel inner leg and an F type steel outer leg, multiple strip hardness strips are arranged on the outer side face of the F type steel outer leg in the longitudinal direction in a spaced manner, the strip hardness strips are arranged in parallel in an inclined manner, andthe included angle alpha of each strip hardness strip relative to the longitudinal direction of the outer side face of the F type steel outer leg is equal to 105 to 110 degrees. The strip hardness strips comprise, by mass percent, 0.03 to 0.09% of C, 0.25 to 0.40% of Si, 1.5 to 2.0% of Mn, not larger than 0.020% of P, not larger than 0.020% of S, 0.10 to 0.30% of Cr, 0.10 to 0.25% of Ni, 0.02 to 0.06% of Nb, 0.002 to 0.006% of B and the balance Fe and inevitable impurities. The F type rail has the higher strength and hardness and good wear resistance.

Description

Technical field [0001] The invention relates to an F-shaped rail, belonging to the technical field of rails for maglev rail transportation, and in particular to an F-shaped rail for reducing friction loss of a maglev train and a preparation method thereof. Background technique [0002] The medium and low speed maglev train is a new type of environmentally friendly transportation method, which uses F-shaped rails as tracks and magnetic poles to support and guide the train. When the maglev train is braked, electromagnetic braking and mechanical braking are used. When electromagnetic braking is used, the train does not have physical frictional contact with the track, and the train is parked on the F track through electromagnetic force. When the physical braking method is adopted, the brake system on the maglev train frictions with the F rail, and the brake pads and the outer legs of the F rail lock to produce friction braking. The F rail uses Q235 material, which has low hardness an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/54C22C38/48C22C38/02C22C33/04C21D1/18E01B25/32
CPCC21D1/18C21D2221/00C22C33/04C22C38/002C22C38/02C22C38/48C22C38/54C22C38/58E01B25/32
Inventor 朱敏费俊杰欧阳珉路周剑华赵国知王瑞敏郑建国
Owner 武汉钢铁有限公司
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