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Method for manufacturing steel rail through nano bainite material containing rare earth La element and steel rail

A nano-bainite and bainite technology, applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve the problem that the strength, toughness and elongation of bainitic rails are difficult to match at the same time, the rail manufacturing, processing technology and heat treatment procedures are complicated, Limiting the promotion and application of bainitic rails to achieve the effect of economical and recyclable, easy mass production, and eliminating the need for heat treatment

Active Publication Date: 2016-06-22
INNER MONGOLIA UNIV OF SCI & TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0011] The bainite rails involved in the above patents have the following technical problems: more expensive alloys Mo and Ni alloys are added to the bainite rails; ; The manufacturing, processing technology and post-sequence heat treatment process of the rail are complicated, the process is not easy to control, and it is not conducive to energy saving and emission reduction, etc.; these factors greatly limit the popularization and application of bainite rail
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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  • Method for manufacturing steel rail through nano bainite material containing rare earth La element and steel rail
  • Method for manufacturing steel rail through nano bainite material containing rare earth La element and steel rail
  • Method for manufacturing steel rail through nano bainite material containing rare earth La element and steel rail

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preparation example Construction

[0043] Another aspect of the present invention provides a method for preparing a nano-bainite rail containing rare earth La element, comprising the following steps:

[0044] The smelting step: specifically includes: 1) deoxidation and desulfurization step, deoxidation and desulfurization of the material matrix, so as to obtain a pure material structure; 2) element addition step, in the pure material structure, the added elements and content weight percentage They 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, satisfying the relationship: 3.0%≤Mn+Si+Cr+Mo≤3.82%; 3) refining step, after adding alloy elements, enter the LF furnace (LADLEFURNACE, ladle refining furnace) for refining, add Vacuum degassing treatment is carried out by VD furnace (Vacuum Degassing, vacuum degassing furnace) after different contents of rare earth La, and then cont...

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Abstract

The invention relates to a method for manufacturing a steel rail through a nano bainite material containing the rare earth La element and the steel rail. The method includes the steps that smelting is carried out, wherein smelting comprises the deoxidation and desulfuration step, the element adding step and the refining and vacuum degassing step; rolling is carried out; and cooling is carried out. According to the preparing method, as the rare earth La is added, the rare earth La and Mn, Cr and Si alloy elements will jointly strengthen the hardenability effect, and therefore the strengthening effect is improved; in addition, expensive alloy Ni is not added, grading cooling control after rolling is used in a combined manner, and therefore the strength of steel is further improved; and meanwhile, the toughness of the steel is improved through the effects of modifying inclusion, grain boundary purification, bainite wattle refining, dislocation generation promoting and the like of the rare earth in the bainite steel, and therefore the steel rail has the excellent toughness.

Description

technical field [0001] The invention relates to a manufacturing method of a steel rail and the steel rail thereof, in particular to a method for manufacturing the steel rail and the steel rail thereof by using a nano-bainite material containing rare earth La element. 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 ...

Claims

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Application Information

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IPC IPC(8): C22C33/04C22C38/04C22C38/02C22C38/18C22C38/12C21D8/00C21D9/04
CPCC21D6/005C21D8/005C21D9/04C21D2211/002C22C33/04C22C38/005C22C38/02C22C38/04C22C38/12C22C38/18
Inventor 包喜荣王晓东陈林田仲良
Owner INNER MONGOLIA UNIV OF SCI & TECH
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