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Steel rail, smelting method thereof and rolling method thereof

A smelting method and rail technology, applied in the field of rail rolling, to achieve the effects of improving tensile strength, good tread hardness, and good promotion value

Inactive Publication Date: 2019-01-18
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The rail material produced can only meet the basic performance requirements of the standard

Method used

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  • Steel rail, smelting method thereof and rolling method thereof
  • Steel rail, smelting method thereof and rolling method thereof
  • Steel rail, smelting method thereof and rolling method thereof

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Experimental program
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Embodiment 1

[0016] The steel rail according to the embodiment of the present invention is used for train transportation, and its chemical composition is: C0.75%~0.90%, Si 0.55%~0.85%, Mn0.95%~1.15%, Cr0. 40%-0.70%, Nb0.01%-0.25%, P≤0.025%, S≤0.025%, the addition of RE alloy is 0.02-0.08%, and the rest is Fe.

[0017] The main alloying elements Si, Mn, Cr, and Nb added to the material are aimed at improving the strength and phase transition temperature of the rail to suit the heat treatment line. 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. Mn expands the austenite phase region, increases the stability of the supercooled austenite of the steel, and significantly improves the hardenability of the steel. Si reduces the transformation speed from austenite to ferrite and improves the strength, elasticity and tempering stability of the steel; the addition o...

Embodiment 2

[0019] The steel rail smelting method according to the embodiment of the present invention includes: molten iron; converter smelting; LF refining; VD; 0.10KPa, deep vacuum time ≥ 15min, superheat ΔT ≤ 30℃, rare earth alloy is added at VD station.

Embodiment 3

[0021] The rolling method of the steel rail according to the embodiment of the present invention includes: billet; sawing; heating; BD1 rolling; BD2 rolling; CCS universal rolling mill continuous rolling; online waste heat quenching; sawing; cooling; Straightening, wherein, the temperature of the billet heating preheating section is not higher than 900°C, and the heating time is not less than 3 hours and 15 minutes; ~940°C; the on-line waste heat quenching cooling medium is a mixture of aerosol and wind, the starting heat treatment temperature of the rail after final rolling is 720°C to 770°C, and the rail is transformed within the pearlite transformation temperature range through the cooling equipment, and the on-line heat treatment is 100~770°C. After 120s, it exits the heat treatment production line, and the rail outlet temperature is 520°C-600°C. After exiting the heat treatment production line, it is naturally air-cooled to room temperature.

[0022] This embodiment provi...

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Abstract

The invention provides a steel rail. The steel rail is applied to train transportation, and comprises the following chemical components in percent by mass: 0.75-0.90% of C, 0.55-0.85% of Si, 0.95-1.15% of Mn, 0.40-0.70% of Cr, 0.01-0.25% of Nb, smaller than or equal to 0.025% of P, smaller than or equal to 0.025% of S, 0.02-0.08% of RE alloy and the balance of Fe. According to a technical scheme adopted by the invention, by using the effect of improving the strength of the steel rail by C element, and adopting on-line residual heat quenching technology, and through reasonable design of the components and addition of optimal Si, Mn, Cr and Nb alloy elements into the steel rail, the tensile strength, the elongation, the tread hardness, the wear resistance and other performance of the steel rail can be improved by a rolling technology; the wear-resistant steel rail produced thereby has very good tensile strength and tread hardness.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a steel rail, a steel rail smelting method and a steel rail rolling method. Background technique [0002] Steel rail is one of the most important components of railway transportation and subway track. Its function is to guide the wheels of rolling stock to move forward, withstand the huge pressure of the wheels, and transmit them to the sleepers. The rails must provide the wheels with a continuous, smooth and least drag rolling surface. With the development of the economy, the number of transportation lines continues to increase, so that the demand for rails in railway lines is also increasing. Steel rails used for railway transportation should have good mechanical properties such as strength, toughness, cross-sectional hardness, wear resistance and corrosion resistance. At present, the rail materials used in railway transportation are basically all kinds of rails in the TB / ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/26B21B1/085C21D1/18C22C33/04
CPCB21B1/085C21D1/18C22C33/04C22C38/005C22C38/02C22C38/04C22C38/26
Inventor 赵桂英涛雅吴章忠高明星王永明梁正伟宋海达木仁扎布李亮军王嘉伟薛虎东周彦董捷
Owner BAOTOU IRON & STEEL GRP
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