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High-strength and high-hardness online heat treatment rare-earth steel rail material and production method thereof

A production method and high-hardness technology, applied in heat treatment furnaces, heat treatment equipment, furnace types, etc., can solve the problems of wear resistance and easy damage, and achieve the effect of improving service life, prolonging overhaul period and low production cost.

Inactive Publication Date: 2020-04-03
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, higher requirements are put forward for the strength and hardness of the rails, especially in road sections with small curve radii or many curves, the commonly used hot-rolled U75V and U71Mn rails show problems such as non-wear resistance and easy damage

Method used

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Embodiment Construction

[0023] The present invention is described in further detail below in conjunction with specific implementation example, so that understand the present invention more clearly, (percentage in the following implementation example is weight percent) above-mentioned rail material comprises with its chemical composition in mass percent: C: 0.93 ~1.0%; Si: 05~0.6%; Mn: 0.9~1.0%; P≤0.020%; S≤0.020%; Cr: 0.15~0.8%; Nb: 0.01~0.05%; : 0.001%, the balance is Fe and unavoidable impurities.

[0024] The C component in the steel is designed to have a large solid solubility with Fe, which has a solid solution strengthening effect and improves the strength and hardness of the steel. The main alloying elements Mn, Cr, and Ni added to the material can improve the strength and toughness of the rail. Mn is a solid solution strengthening element in the rail steel, which improves the hardness and strength of the rail and reduces the transformation temperature of pearlite, thereby reducing the pearlit...

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Abstract

The invention discloses a high-strength and high-hardness online heat treatment rare-earth steel rail material. The high-strength and high-hardness online heat treatment rare-earth steel rail materialcomprises the following chemical components in percentage by mass: 0.93-1.0% of C, 05-0.6% of Si, 0.9-1.0% of Mn, not more than 0.020% of P, not more than 0.020% of S, 0.15-0.3% of Cr, 0.01-0.05% ofNb, 0.15-0.5% of Ni, 0.001% of Ce, and the balance Fe and inevitable impurities. The invention further discloses a production method of the high-strength and high-hardness online heat treatment rare-earth steel rail material. The prepared steel rail material has the tensile strength not less than 1330 MPa, the elongation not less than 9%, and the steel rail tread hardness not less than 400 HB.

Description

technical field [0001] The invention relates to the field of metallurgical materials, in particular to a high-strength, high-hardness online heat-treated rare-earth rail material and a production method thereof. Background technique [0002] Railway transportation plays an important role in the construction of the national economy, and it is developing rapidly towards the direction of large transportation volume and high efficiency. Therefore, higher requirements are put forward for the strength and hardness of the rails, especially in road sections with small curve radii or many curves, the commonly used hot-rolled U75V and U71Mn rails show problems such as non-wear resistance and easy damage. In order to improve the performance of rails and prolong the life of rails, the development of high-strength and high-hardness rails has become an important topic, which has broad market prospects and good economic benefits. Contents of the invention [0003] In order to solve the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D6/00C21D8/00C21D9/04C22C38/02C22C38/04C22C38/48C22C33/04
CPCC21D1/18C21D6/004C21D6/005C21D6/008C21D8/005C21D9/04C21D2211/009C22C33/04C22C38/002C22C38/005C22C38/02C22C38/04C22C38/48
Inventor 赵桂英涛雅薛虎东边影郑瑞董捷王慧军苏航王嘉伟
Owner BAOTOU IRON & STEEL GRP
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