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A kind of nano-bainite material containing rare earth la element, steel rail and preparation method thereof

A technology of nano-bainite and elements, which is applied in the direction of steel rails, rails, manufacturing tools, etc., can solve the difficulty of matching the strength, toughness and extensibility of bainite steel rails at the same time, limit the popularization and application of bainite steel rails, and have no correlation with rare earth Problems such as patents and reports, to achieve economical and recyclable, easy to mass production, save the effect of heat treatment process

Active Publication Date: 2017-08-25
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] All in all, there are the following technical problems in the bainite rails involved in the above patents: more expensive alloys Mo and Ni alloys are added to the bainite rails; it is difficult to match the strength, toughness and ductility of the bainite rails simultaneously Frequent rails; rail manufacturing, processing technology and subsequent heat treatment procedures are complicated, the process is not easy to control, and it is not conducive to energy saving and emission reduction; these factors greatly limit the popularization and application of bainite rails
However, there are no relevant patents and reports on the application of rare earths in air-cooled bainite rails containing alloys such as Mn and Cr.

Method used

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  • A kind of nano-bainite material containing rare earth la element, steel rail and preparation method thereof
  • A kind of nano-bainite material containing rare earth la element, steel rail and preparation method thereof
  • A kind of nano-bainite material containing rare earth la element, steel rail and preparation method thereof

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preparation example Construction

[0042] In the preparation method of the nano-bainite material containing the rare earth La element of the present invention, it includes: a deoxidation and desulfurization step, deoxidizing and desulfurizing the matrix of the nano-bainite material, so as to obtain a pure material structure; an element addition step, In the obtained pure material structure, the added elements and content percentages by weight are: carbon C: 0.18%-0.30%, manganese Mn: 1.4%-1.8%, silicon Si: 0.8%-1.0%, chromium Cr≤1.0%, molybdenum Mo: 0.25-0.32%, lanthanum La: 0.0050%-0.015%, the rest is iron Fe and impurities, the total amount of manganese, silicon, chromium and molybdenum satisfies the relationship: 3.0%≤Mn+Si+Cr +Mo≤3.82%; and a refining and vacuum degassing step, performing vacuum degassing treatment on the material structure obtained after adding elements.

[0043] In the refining and vacuum degassing steps, enter the LF furnace (LADLE FURNACE, ladle refining furnace) for refining after addi...

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Abstract

The invention relates to a rare earth element La containing nanometer bainite material and a steel rail, and preparation methods thereof. Chemical components of the nanometer bainite material include, by weight, 0.18%-0.30% of C, 1.4%-1.8% of Mn, 0.8%-1.0% of Si, 0-1.0% of Cr, 0.25%-0.32% of Mo, 0.0050%-0.015% of La, and the balance Fe and impurities. The total amount of the alloy elements such as the manganese, the silicon, the chromium and the molybdenum conforms to the relation formula being 3.0%<=Mn+Si+Cr+Mo<=3.82%. By means of the component multi-element microalloying principle, the rare earth La is added, the hardenability is improved by means of the rare earth La and low-price Mn, Cr and Si alloy elements, the strengthening effect is improved, moreover an expensive alloy Ni is not added, and therefore, the nanometer bainite material and the steel rail are good in strength and toughness property.

Description

technical field [0001] The invention relates to a nano-bainite material, a steel rail and a preparation method thereof, in particular to a nano-bainite material containing rare earth La element, a steel rail and a preparation method thereof. Background technique [0002] With the vigorous development of high-speed railways in the world, the comprehensive performance of high-speed railway rails is increasingly demanding. Bainite rail is a new generation of ultra-high-strength rail developed by my country according to the needs of railway development and its own resource characteristics. It has ultra-high strength (up to 1500MPa) due to its unique composition design. The composition feature is that Mn, Cr, Alloys such as Mo and Ni can improve the air-cooling hardenability of bainite, inhibit the precipitation of carbides, and make C solid solution, which can make the greatest contribution to the strength; its air-cooling self-hardening characteristics can realize the ultra-shor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/12C22C38/18C22C38/06C22C38/16C21D9/04E01B5/02
CPCC21D9/04C21D2211/002C22C38/005C22C38/02C22C38/04C22C38/06C22C38/12C22C38/16C22C38/18E01B5/02
Inventor 王晓东包喜荣田仲良陈林
Owner INNER MONGOLIA UNIV OF SCI & TECH
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