Internal high hardness type pearlitic rail with excellent wear resistance, rolling contact fatigue resistance, and delayed fracture property and method for producing same

A pearlitic steel rail and manufacturing method technology, applied in the direction of manufacturing tools, furnace types, metal rolling, etc., can solve the problems of harsh use environment of pearlitic steel rails, and achieve the effect of preventing railway accidents
CN101743334AActive Publication Date: 2010-06-16JFE STEEL CORP
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
JFE STEEL CORP
Publication Date
2010-06-16

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Abstract

An internal high hardness type pearlitic rail has a composition containing 0.73% to 0.85% by mass C, 0.5% to 0.75% by mass Si, 0.3% to 1.0% by mass Mn, 0.035% by mass or less P, 0.0005% to 0.012% by mass S, 0.2% to 1.3% by mass Cr, 0.005% to 0.12% by mass V, 0.0015% to 0.0060% by mass N, and the balance being Fe and incidental impurities, wherein the value of ¢% Mn! / ¢% Cr! is greater than or equal to 0.3 and less than 1.0, where ¢% Mn! represents the Mn content, and ¢% Cr! represents the Cr content, and the value of ¢% V! / ¢% N! is in the range of 8.0 to 30.0, where ¢% V! represents the V content, and ¢% N! represents the N content, and wherein the internal hardness of a rail head is defined by the Vickers hardness of a portion located from a surface layer of the rail head to a depth of at least 25 mm and is greater than or equal to 380 Hv and less than 480 Hv.
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Description

technical field

[0001] The present invention relates to an internal high hardness type pearlitic rail excellent in wear resistance and rolling contact fatigue (RCF) resistance and a manufacturing method thereof, specifically, It relates to the realization of use under severe high-axle load conditions such as overseas mine railways (mininig railways) that are heavy in weight of freight cars and have many high curve lines An internal high-hardness pearlitic steel rail excellent in wear resistance, fatigue damage resistance, and delayed fracture resistance (delayed fracture property) for longer operating life of the rail, and a manufacturing method thereof. Background technique

[0002] On the high-axle load railway (high-axle load railway) mainly transporting mineral ore, the load imposed on the axle (axle) of the freight car is much larger than that of the passenger car (passenger car), the use environment of the rail (use environment) also becomes harsh. Rails used in such...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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