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

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...

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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.

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