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Hyper-eutectoid steel rail and manufacturing method thereof

A hypereutectoid, rail technology, applied in the direction of rails, rails, manufacturing tools, etc., can solve the problem of difficult to meet the needs of large axle load transportation, and achieve the effect of excellent corrosion resistance and excellent tensile properties

Active Publication Date: 2015-11-04
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent application is aimed at improving the strength, toughness, fatigue resistance, wear resistance and corrosion resistance of low carbon or ultra-low carbon steel, for example, the tensile strength is about 1100MPa, and the corrosion rate is 2g / m 2 About h, it is difficult to meet the needs of heavy-duty and heavy-duty railway transportation with large axle loads, and it is not suitable for performance improvement of high-carbon steel such as rails

Method used

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  • Hyper-eutectoid steel rail and manufacturing method thereof
  • Hyper-eutectoid steel rail and manufacturing method thereof
  • Hyper-eutectoid steel rail and manufacturing method thereof

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preparation example Construction

[0011] The invention provides a method for preparing a hypereutectoid rail, the method comprising:

[0012] Roll the steel slab after the heat preservation treatment to obtain the rail. After the surface temperature of the rail head is naturally cooled to 750-850°C, the cooling medium is used for the first cooling stage to reduce the surface temperature of the rail head to 350-550°C, and then air-cooled The second cooling stage is carried out in a manner to reduce the surface temperature of the rail head to 15-40°C, wherein,

[0013] The composition of the billet is: 0.86-1.05% by weight of C, 0.3-1% by weight of Si, 0.5-1.3% by weight of Mn, 0.15-0.35% by weight of Cr, 0.3-0.5% by weight of Cu, 0.02-0.04% by weight %P by weight, S with a content of 0.02% by weight or less, and Ni with a content of 1 / 2-2 / 3 of Cu, and at least one of V, Nb and Re, and the balance is Fe and unavoidable impurities; Wherein, under the condition that at least one of V, Nb and Re is contained, the ...

Embodiment 1-10

[0035] This embodiment is used to illustrate the hypereutectoid rail of the present invention and its preparation method.

[0036] The 1# to 10# steel billets in Table 1 were respectively kept in a heating furnace at 1200°C for 3 hours to obtain a steel billet with a surface layer temperature of 1200°C. The surface temperature after rolling) is 910°C. After the surface temperature of the rail head after the final rolling is naturally cooled to 805°C, a cooling medium is applied to the top surface and both sides of the rail head of the rail. The cooling medium is a water mist mixture. The rail is cooled in the first stage at a cooling rate of 2.5°C / s to reduce the surface temperature of the rail head to 410°C; then the rail is air-cooled to about 20°C, and rails A1 to A10 are obtained after vertical composite straightening.

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Abstract

The invention discloses a manufacturing method of a hyper-eutectoid steel rail. According to the method, an adopted steel billet comprises, by weight, 0.86-1.05% of C, 0.3-1% of Si, 0.5-1.3% of Mn, 0.15-0.35% of Cr, 0.3-0.5% of Cu, 0.02-0.04% of P, smaller than 0.02% of S, Ni, one of V, Nb and Re, and the balanced Fe and inevitable impurities, wherein the Ni is one half to two thirds of Cu. The invention further provides the hyper-eutectoid steel rail obtained through the method. According to the hyper-eutectoid steel rail, the high-carbon steel billet with the specific composition is made into the hyper-eutectoid steel rail with the good corrosion resistance and good tensile property.

Description

technical field [0001] The invention relates to a hypereutectoid steel rail and a preparation method thereof. Background technique [0002] The rapid development of railway transportation has put forward higher requirements for the service performance of steel rails, especially for freight railways and heavy-duty special lines. With the continuous increase of axle load, traffic density and total passing weight, the service environment of steel rails is almost harsh; The radius curve section has become a hard-hit area, and the rails are seriously worn out. Some rails even need to be replaced for the lower track within a year of the upper track, which seriously restricts the transportation efficiency of the railway. The railway department is in urgent need of higher performance rail products. At the same time, in coastal areas and wet tunnels, rails also face the problem of rapid corrosion. The interaction between the rail bottom, the gasket and the ballast bed leads to the f...

Claims

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Application Information

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IPC IPC(8): C21D9/04C22C38/42C22C38/46C22C38/48
CPCB21B1/085C21D9/04C22C38/02C22C38/04C22C38/16C21D1/60C21D1/613C21D8/005C22C38/002C22C38/42C22C38/46C22C38/48E01B5/02
Inventor 韩振宇邹明郭华王春建汪渊贾济海李大东邓勇袁俊
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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