Bainite steel rail with excellent anti-fatigue performance and its production method

A production method and anti-fatigue technology, applied in the field of iron and steel materials, can solve the problems of aggravating non-metallic inclusions, residual stress, austenite instability, bainite rail fatigue performance, etc., achieve excellent fatigue resistance, change the structure and performance Effect

Inactive Publication Date: 2009-03-25
ANGANG STEEL CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

[0006] As we all know, hydrogen is very easy to induce hydrogen embrittlement in steel, and higher hydrogen content intensifies the adverse effects of non-metallic inclusions, residual stress, and instability of retained austenite on the fatigue performance of bainite rails

Method used

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  • Bainite steel rail with excellent anti-fatigue performance and its production method
  • Bainite steel rail with excellent anti-fatigue performance and its production method
  • Bainite steel rail with excellent anti-fatigue performance and its production method

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Embodiment Construction

[0022] The chemical composition of the present invention is calculated by weight percentage, containing C: 0.10-0.35%, Si: 0.80-2.00%, Mn: 0.80-3.30%, Cr: <2.00%, Mo: 0.05-0.80%, N: 10 ~100ppm, add Nb and Ti in combination, Nb: 0.005~0.10%, Ti: 0.005~0.13%, and Nb+Ti≤0.16, H≤1.0ppm, the rest is Fe and unavoidable impurities.

[0023] The present invention can also add one of Ni and W to the above-mentioned rail components as required or in different combinations, wherein Ni: ≤0.8%, W: ≤0.8%. Adding Ni and W is used to further improve the stability of retained austenite. The effect of adding Nb or V or Ti or Nb, V or V and Ti combined addition alone is not as good as Nb and Ti combined addition. The method of compound addition of Nb and Ti makes the microstructure of the rail very fine, and has the microstructure conditions required for canceling the tempering of the rail.

[0024] In order to obtain the above-mentioned properties, the present invention controls its chemical c...

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Abstract

The invention discloses excellent fatigue resistance bainite structure rail and producing method. Its chemical components are 0.10-0.35wt% C, 0.80-2.00wt% Si, 0.80-3.30wt% Mn, less than 2.00wt% Cr, 0.05-0.80wt% Mo, 10-100ppm N, 0.005-0.10wt% Nb, Ti, Nb, 0.005-0.13wt% Ti, less than 0.16wt% Nb and Ti, rest Fe and unavoidable impurity. The producing method includes the following steps: vacuum dwelling processing or continuous casting billet at AC3 point; isothermal treatment at 50-100 degree centigrade; controlling hydrogen content at not more than 1.0ppm; pre-springing or controlling rail optimum straightening percent reduction; residual stress is not more than 200MPa; the alkalinity of turbulator, control ladle, and tundish is not less than 0.9, and not more than 2.5; weak blowing argon for 1-11 minutes in vacuum degassing; flow rate is 50-150 M3 / h; the size of single non-metallic inclusion is not less than 40mum. The rail is natural cooling in air after hot rolling to make it have excellent fatigue resistance that it is still unwounded after fatigue test for two million times.

Description

technical field [0001] The invention relates to a steel material, in particular to a steel rail containing bainite structure and a production method of the steel rail. Background technique [0002] The patents and literature reports of bainite rails mainly focus on the influence of the adjustment of chemical composition and microstructure on the wear resistance and rolling contact fatigue resistance of rails. Most of the bainitic steel and rails need tempering treatment, such as the high-performance wear-resistant steel and its manufacturing method for high-speed and quasi-high-speed railway forks (patent No. 98112095.4), and the rails introduced by medium and low carbon manganese bainitic steel (application No. 03150092.7) Because the product does not involve the method of adding Nb and Ti compound and the corresponding control means, it needs to be tempered at low temperature. The technology of producing bainite rail through tempering is relatively mature. However, using ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C22C33/04C21C7/10B22D11/14B22D11/16B21D3/00
Inventor 陈昕王文仲金纪勇张序平杨玉刘宏李晓非杜斌马成宁东刘鹤潘玲
Owner ANGANG STEEL CO LTD
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