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A method for reducing the residual stress of steel rail and the obtained steel rail and its application

A residual stress and rail technology, applied in the direction of rail, rail, process efficiency improvement, etc., can solve the problems of insufficient flatness and surface quality, and high residual stress of rails

Active Publication Date: 2018-10-09
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the defects of high residual stress, flatness and surface quality of the prior art rail, and provide a method for reducing the residual stress of the rail and the rail obtained by the method

Method used

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  • A method for reducing the residual stress of steel rail and the obtained steel rail and its application
  • A method for reducing the residual stress of steel rail and the obtained steel rail and its application
  • A method for reducing the residual stress of steel rail and the obtained steel rail and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Molten steel smelting: Smelting is carried out with low-S furnace molten iron with an S content of about 0.008% by weight. During the smelting process, refining slag composed of aluminum oxide, barium oxide and calcium fluoride (wherein the percentage content is w(Al 2 o 3 )=23% by weight, w(BaO)=10% by weight, w(CaF 2 )=5% by weight, the basicity is 5) and a carburant composed of anthracite and low-N alloy, a foaming agent is used in the heating process of the LF furnace, and the composition content is controlled to finally obtain the chemical compound shown in 1# in Table 1 Composition of molten steel.

[0032] (2) The molten steel obtained in step (1) is fully protected and cast into a steel billet, and then sent to the slow cooling pit for slow cooling at a rate of 0.3°C / min, and the steel billet cooled to room temperature is sent into a heating furnace for heating and heat preservation ( The heating rate is 10°C / min, the termination temperature (tapping temp...

Embodiment 2-6

[0035] According to the method of Example 1, the difference is that the chemical composition of the molten steel obtained by smelting is as shown in Table 1 and Table 2, and the specific operating parameters of the method are as shown in Table 1.

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PUM

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Abstract

The invention relates to the field of steel making, in particular to a method for reducing the residual stress of a steel rail, the steel rail obtained according to the method, and the application of the steel rail. The method for reducing the residual stress of the steel rail comprises the step of sequentially carrying out accelerated cooling, slow cooling and air cooling on the rail head tread centers, the two sides of each rail head and the center part of the rail base of the steel rail obtained after rolling, wherein the starting cooling temperature of accelerated cooling is 650 DEG C to 950 DEG C, the cooling rate of accelerated cooling is 2 DEG C per second to 8 DEG C per second, the finish cooling temperature of accelerated cooling is 400 DEG C to 600 DEG C, the cooling rate of slowing cooling is 0.1 DEG C per second to 1.5 DEG C per second, and the finish cooling temperature of slow cooling is 180 DEG C to 300 DEG C. With the method for reducing the residual stress of the steel rail, on the premise that the tensile property of the steel rail is guaranteed, the residual stress of the steel rail can be effectively reduced, and the flatness of the steel rail can be improved. The steel rail is particularly suitable for high-speed railways.

Description

technical field [0001] The invention relates to the field of steel making, in particular to a method for reducing the residual stress of a steel rail, a steel rail obtained according to the method and an application thereof. Background technique [0002] With the increase of train speed on high-speed railways, the train speed has gradually increased from the highest speed of 100kg / h in the 1990s to 200kg / h, 250kg / h, 300kg / h and 350km / h today. The increase of train speed and the improvement of passenger comfort on the train have put forward higher requirements for the straightness and surface quality of the rail. The existing methods to improve the flatness and surface quality of the rail mainly focus on the rolling and straightening process of the remaining rail, but they cannot reduce the residual stress of the rail very well. Abrasions and straightening marks. Therefore, the existing methods are difficult to effectively meet the production requirements of the rail, and a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/04C21D8/00C22C38/02C22C38/04C22C38/12C22C38/06E01B5/02
CPCC21D8/005C21D9/04C21D2221/10C22C38/02C22C38/04C22C38/06C22C38/12E01B5/02Y02P10/20
Inventor 袁俊邹明郭华李大东邓勇韩振宇汪渊陈崇木
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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