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Production method for improving whole-section residual stress uniformity of F-shaped rail

A technology of residual stress and production method, applied in the direction of improvement of process efficiency, furnace type, furnace, etc., can solve the problems of poor uniformity of residual stress distribution and large residual stress in the whole section, and achieve easy popularization and application, simple production method, and reduction The effect of small temperature differences

Active Publication Date: 2020-09-08
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

[0007] The purpose of the present invention is to overcome the problems of poor distribution of residual stress and excessive residual stress in the current F-shaped rail, and provide a production method that can effectively improve the uniformity of residual stress in the entire cross-section of the F-shaped rail. Control the cooling intensity and temperature difference at each position of the F-rail section after rolling, so that the distribution of residual stress on the entire section of the F-rail is more uniform and the performance is improved

Method used

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  • Production method for improving whole-section residual stress uniformity of F-shaped rail
  • Production method for improving whole-section residual stress uniformity of F-shaped rail
  • Production method for improving whole-section residual stress uniformity of F-shaped rail

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Experimental program
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Effect test

Embodiment 1

[0039] The chemical composition of F-rail is: C: 0.07%, Si: 0.26%, Mn: 0.90%, Cr: 0.10%, Nb: 0.05%, P: 0.016%, S: 0.008%, and the rest are Fe and impurities element. The production method is as follows: according to the conventional section steel smelting and casting methods, the process includes converter smelting, LF refining, vacuum treatment and continuous casting. Among them, molten iron desulfurization adopts magnesium powder desulfurization process, converter smelting adopts top-bottom combined blowing process, LF refining slag alkalinity is controlled at 1.8-2.3, RH vacuum treatment time is not less than 15 minutes, tundish temperature in continuous casting process It is controlled at 15-20°C above the liquidus line, and the casting speed is 0.6-1.0m / min. The continuous casting process should be carried out under full protection to prevent contact with air. At the same time, the cast billets should be naturally stacked and cooled to room temperature. A walking beam h...

Embodiment 2

[0041] The chemical composition of F-rail is: C: 0.09%, Si: 0.27%, Mn: 1.15%, Cr: 0.13%, Nb: 0.02%, P: 0.011%, S: 0.010%, and the rest are Fe and impurities element. The production method is carried out according to the method of Example 1, the difference is that the rolling process and post-rolling accelerated cooling process parameters are as shown in Table 1.

Embodiment 3

[0043] The chemical composition of F-rail is: C: 0.05%, Si: 0.22%, Mn: 0.85%, Cr: 0.09%, Nb: 0.03%, P: 0.013%, S: 0.009%, and the rest are Fe and impurities element. The production method is carried out according to the method of Example 1, the difference is that the rolling process and post-rolling accelerated cooling process parameters are as shown in Table 1.

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Abstract

The invention discloses a production method for improving whole-section residual stress uniformity of an F-shaped rail. The production method comprises the following steps: dividing the F-shaped railinto three cooling areas according to different positions of a section, cooling the three cooling areas of the rolled F-shaped rail at different cooling rates, wherein the initial cooling temperatureis controlled to be 520-600 DEG C, the cooling rate of the first cooling area is 0.2-0.7 DEG C / s, the cooling rate of the second cooling area is 0.8-1.3 DEG C / s, and the cooling rate of the third cooling area is 1.4-2.0 DEG C / s, stopping accelerated cooling when the surface temperature of the first cooling area is reduced to 60-100 DEG C, and carrying out straightening and finishing. According tothe method provided by the invention, by reasonably controlling the cooling strength of each position of the section of the rolled F-shaped rail, the temperature difference of the whole section of theF-shaped rail is reduced, and the absolute value of the whole-section residual stress fluctuation is controlled within 100MPa.

Description

technical field [0001] The invention relates to a treatment method in the production process of steel rails, in particular to a production method for improving the uniformity of residual stress on the full section of an F-shaped rail, and belongs to the field of metal material production and application. Background technique [0002] Medium and low-speed maglev trains are an important direction for the development of urban rail transit at present. They have many characteristics such as fast speed, safety, energy saving, and environmental protection. my country has built and operated two medium- and low-speed maglev lines. With the rapid development of urban transportation in my country, the development of maglev railways Showing a momentum of leaps and bounds. [0003] F-rails are used to manufacture tracks and magnetic poles of maglev railways, to support and guide trains, and their product performance has an important impact on the stability and safety of trains. The shape...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/04C22C38/02C22C38/04C22C38/26B21B37/74
CPCC21D9/04C22C38/02C22C38/04C22C38/26B21B37/74C21D2211/005C21D2211/009Y02P10/20
Inventor 费俊杰朱敏周剑华叶佳林王俊郑建国王瑞敏赵国知
Owner 武汉钢铁有限公司
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