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Steel rail and method for manufacturing steel rail

一种钢轨、钢坯的技术，应用在钢轨及其制造领域，能够解决不能够得到充分特性、高强度钢轨尚未被提供等问题

Active Publication Date: 2022-03-25
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high-strength steel rails disclosed in Patent Documents 3, 4, and 5 cannot obtain sufficient characteristics for use in severe rail environments that have been required in recent years, and further improvement of internal fatigue damage resistance has become a problem.
[0014] As described above, high-strength steel rails excellent in wear resistance and internal fatigue damage resistance that can be used in freight railroads with severe track environments have not yet been provided.

Method used

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  • Steel rail and method for manufacturing steel rail
  • Steel rail and method for manufacturing steel rail
  • Steel rail and method for manufacturing steel rail

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Experimental program
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Effect test

Embodiment

[0335] In order to confirm the effects of the present invention, experiments using the following procedure were performed.

[0336] The steel slabs having the chemical compositions recorded in Table 2-1 to Table 2-4 are heated, the heated steel slabs are hot rolled to form steel rails, and the steel rails are subjected to accelerated cooling and controlled cooling, thereby obtaining the steel slabs having the chemical composition shown in Table 3-1. ~ Rails with the metal structure, hardness, and V nitrides containing Cr listed in Table 3-4. In these tables, values ​​outside the scope of the invention are underlined. Unless otherwise stated in the remarks column of the table, the production conditions are as follows.

[0337] ·Slab heating rate: 4°C / min in the range of 1000-1200°C

[0338] ·End temperature of billet heating: 1250℃

[0339] ·Final rolling temperature: 950℃

[0340]・Final reduction (section reduction rate): 5 to 10%

[0341] The start temperature of acceler...

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Abstract

A steel rail containing C: 0.75-1.20%, Si: 0.10-2.00%, Mn: 0.10-2.00%, Cr: 0.10-1.20%, V: 0.010-0.200%, N: 0.0030-0.0200% in mass % . More than one species, the balance contains Fe and impurities, and the structure from the head outer surface to the depth of 25mm contains pearlite structure with an area ratio of 95% or more, and the hardness of the structure is in the range of Hv360-500, In the ferrite phase in the pearlite structure at a depth of 25 mm starting from the surface of the head outline, the number density of V nitrides containing Cr with a particle size of 0.5 to 4.0 nm is 1.0×10 17 ~5.0×10 17 cm ‑3 range.

Description

technical field [0001] The present invention relates to a steel rail, which is a high-strength steel rail used in freight transport railways, and has excellent wear resistance and internal fatigue damage resistance, and a method for manufacturing the same. [0002] This application claims priority based on Patent Application No. 2018-168799 filed in Japan on September 10, 2018, the contents of which are incorporated herein by reference. Background technique [0003] Along with economic development, new development of natural resources such as coal is advancing. Specifically, mining and excavation of natural resources in previously undeveloped regions with harsh natural environments is advancing. Accompanied by this, the track environment has become significantly harsher in the freight transport railways that transport resources. As a result, rails are required to have higher wear resistance than conventional ones. [0004] In addition, with regard to freight transport rai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C22C38/58C21D8/00C22C38/38
CPCC22C38/04C22C38/12C22C38/14C22C38/18C21D9/04C21D2211/009C21D2211/004C22C38/24C22C38/38C22C38/001C22C38/02C22C38/22C22C38/30C22C38/32C22C38/20C22C38/40C22C38/26C22C38/28C22C38/005C22C38/002C22C38/06C21D8/005C21D1/78C21D6/02C22C38/58C22C38/46C21D8/00B21B1/085C21D6/008C21D8/0226C22C38/34E01B5/02
Inventor 上田正治高桥淳宫崎照久棚桥拓也
Owner NIPPON STEEL CORP