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Steel rail for subways and preparation method of steel rail

A technology for steel rails and subways, applied in the field of subway steel rails and their preparation, can solve the problems of increasing the labor intensity of maintenance personnel, the frequency of steel rail replacement, the contact fatigue damage of hot-rolled steel rails, and the increase of line maintenance costs, and achieve excellent resistance to contact fatigue. The effect of damage performance

Inactive Publication Date: 2020-08-04
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

However, due to the small curve radius of subway lines and frequent acceleration and deceleration, the U75V hot-rolled steel rails with small radius curves are prone to serious contact fatigue damage, which will increase the labor intensity of maintenance personnel and the frequency of rail replacement, increase line maintenance costs, and even endanger line operation safety

Method used

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  • Steel rail for subways and preparation method of steel rail
  • Steel rail for subways and preparation method of steel rail
  • Steel rail for subways and preparation method of steel rail

Examples

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preparation example Construction

[0022] According to the second aspect of the present invention, the present invention also provides a method for preparing the above-mentioned steel rail for subway, which includes the following steps: rolling the steel slab after the heat preservation treatment to obtain the waste heat rail, and developing the rail head portion of the rail with waste heat Accelerated cooling heat treatment, accelerated cooling heat treatment is divided into two stages: the first stage, the cooling temperature is greater than 800 ℃, the cooling rate is controlled at 4-5 ℃ / s for cooling; the second stage, when the rail is cooled to 550-600 ℃, the control Continue cooling at a cooling rate of 1.5-2.5°C / s; stop accelerated cooling when the temperature drops to 440-460°C, and then cool naturally in the air to room temperature.

[0023] According to the method of the present invention, based on the weight of the steel slab, it contains 0.65-0.75% by weight of C, 0.20-0.50% by weight of Si, 0.80-1.00...

Embodiment

[0031] Two steel rails were rolled out by adopting a kind of steel rail for subway with good contact fatigue performance of the present invention and its preparation method to carry out relevant component performance inspection, and the results are as follows:

[0032] Table 1 shows the chemical composition of the two steel rail embodiments rolled according to the composition scope of the present invention and the chemical composition of the conventional steel rail comparative example of the current line.

[0033] Table 1 two embodiment of the present invention and comparative example chemical composition

[0034]

[0035] The steel billet containing the above components is rolled into 60kg / m rails, and the heat treatment process of the two rails is shown in Table 2.

[0036] Table 2 heat treatment process control parameters

[0037]

[0038] The rails treated by the above process are cooled to room temperature, and the contact fatigue samples are taken from the upper rai...

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Abstract

The invention relates to the field of steel rail materials, in particular to a steel rail for subways and a preparation method of the steel rail. According to the steel rail for the subways, on the basis of the total weight of a steel billet of the steel rail for the subways, the steel billet is prepared from 0.65%-0.75% of C, 0.20%-0.50% of Si, 0.80%-1.00% of Mn, 0.04%-0.10% of V and the balanceFe and inevitable impurities. The preparation method includes the following steps that the steel billet after heat insulation treatment is rolled, a waste-heat steel rail is obtained, quick cooling heat treatment is performed at the rail head part, heat treatment is divided into two sections, in the first section, the open cooling temperature is higher than 800 DEG C, the cooling rate is controlled to range from 4 DEG C / s to 5 DEG C / s for cooling, and in the second section, when the steel rail is cooled to the temperature ranging from 550 DEG C to 600 DEG C, the cooling rate is controlled to range from 1.5 DEG C / s to 2.5 DEG C / s for continuous cooling; and accelerated cooling is stopped when the temperature is reduced to be in the range of 440-460 DEG C, and then the steel rail is air-cooled to the room temperature. The steel rail has the excellent contact fatigue damage resistance.

Description

technical field [0001] The invention relates to the field of rail materials, in particular to a rail for subway with excellent contact fatigue performance and a preparation method thereof. Background technique [0002] As the main carrier of urban rail transit, urban rail transit such as subways, light rails, and trams are booming; by the end of 2018, 39 cities across the country have been approved to build subways. It is estimated that by 2020, the total mileage of subways in the country will reach 6,000 kilometers. Investment reached 4 trillion. Compared with ordinary railway lines, the subway has its distinctive characteristics: the axle load of the train is small; the radius of the curve is small, with a radius of about 300m in the majority; the frequency of operation is high, and the start and stop are frequent. [0003] Domestic subway companies and design institutes have selected U75V hot-rolled steel rails as subway rails. Years of use have shown that U75V hot-roll...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12E01B5/02C21D9/04
CPCC21D9/04C22C38/02C22C38/04C22C38/12E01B5/02
Inventor 汪渊袁俊李若曦杨大巍
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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