A kind of method for manufacturing steel rail and steel rail using nano-bainite material containing rare earth la element

A technology of nano-bainite and bainite, which is applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve the difficulty of matching the strength, toughness, and extensibility of bainite rails at the same time, and the manufacturing and processing of rails. Restrict the popularization and application of bainite rails, etc., to achieve the effect of economical and recyclable, convenient for large-scale production, and save the heat treatment process
CN105695849BActive Publication Date: 2017-05-17INNER MONGOLIA UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
INNER MONGOLIA UNIV OF SCI & TECH
Publication Date
2017-05-17

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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.
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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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