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Ultra-fine pearlite high-strength rail steel and its preparation method

A pearlitic, high-strength technology, used in manufacturing tools, heat treatment equipment, heat treatment process control, etc., can solve problems such as brittle strength cannot be improved, plasticity is reduced, plasticity is affected, and hot workability is affected.

Inactive Publication Date: 2006-12-27
XI AN JIAOTONG UNIV
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  • Abstract
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Problems solved by technology

However, the traditional concept believes that the increase of carbon content will affect the plasticity and thermal formability, and the increase of carbon content above 1% will make its plasticity decrease sharply, and the severe brittleness will also make its strength unable to increase, so it cannot be used for rails (structural materials) )Production

Method used

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  • Ultra-fine pearlite high-strength rail steel and its preparation method
  • Ultra-fine pearlite high-strength rail steel and its preparation method

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Embodiment Construction

[0028] Ultra-fine pearlitic high-strength track steel, the alloy composition weight percentage is: C: 1.0-1.8; Al: 0.1-6.0; Cr: 0.1-2.5; Mn: 0.2-0.8; Si: 0-1.5; Mo: 0-0.8 ; Nb: 0.0-0.1; V: 0.0-0.1; Ti: 0.0-0.1; Re: 0.0-0.05; the balance is Fe.

[0029] The performance of the above-mentioned ultra-fine pearlitic high-strength rail steel with this structure feature is characterized by two aspects. One is that the tensile strength above 1300MPa can be obtained without quenching and tempering treatment, the yield strength above 900MPa, and the yield strength above 10% elongation; second, high wear resistance can be obtained without surface quenching.

[0030] Make the proeutectoid carbides broken and spheroidized, the crystal grains are ultra-fine, and the structure is ultra-fine granular carbides distributed on the ultra-fine pearlite grains, the grain size is 2-6 μm, and the pearlite lamellar spacing is 0.1-0.2 μm , The size of granular carbides is 0.3-1 μm.

[0031] The above...

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Abstract

This invention exposed a kind of ultra-fine pearlite high intensity railway steel. The weight proportion of alloy are C: 1.0-1.8, Al: 0.1-6.0, Cr: 0.1-2.5, Mn: 0.2-0.8, Si: 0- 1.5, Mo: 0-0.8, Nb: 0-0.1, V: 0-0.1, Ti: 0-0.1, Re: 0-O.05, remains is Fe. The preparation steps includes: smelting, casting to get bland, then deformation, air-cooled to get the material free from heating. The material can be smelted and rolled to be full-fashioned products, or reheated to austenite zone and rolled. Then it can get the mechanical characters of 900Mpa yield strength, 1300Mpa tensile strength and more than 10% Elongation. The wearability is 1.5 time of normal high-carbon steel. It has good jointing character. Hot rolling with high deformation can form good rail. It can be used to heavy load railway.

Description

technical field [0001] The invention relates to the preparation of rail steel, in particular to an ultra-fine pearlitic high-strength rail steel for high-speed railway tracks and heavy-duty railway tracks and a preparation method thereof. technical background [0002] With the rapid development of railway transportation, especially the rapid development of heavy rail lines, it is urgent to improve the strength and wear resistance of rail steel. General heavy rail steel requires tensile strength σ b ≥880MPa, δ 5 ≥10%, hardness (HB): 260~300. The carbon content of rail steel currently used is 0.6% to 0.8%, which belongs to eutectoid steel. In order to improve the strength and wear resistance, some patents add Nb, V, rare earth and other elements on the basis of this composition (Chinese patent application CN 96117731.4, CN99111744.1) and adopt processes such as controlled rolling to improve its mechanical properties; Tensile structure to improve st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/18C21D9/04C21D11/00
Inventor 柳永宁张占领朱杰武
Owner XI AN JIAOTONG UNIV
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