European-standard R320Cr steel rail and producing method thereof

A production method and technology of r320cr, applied in the field of metallurgical materials, can solve the problems of low output, high energy consumption cost and poor rail quality of the rail production method, so as to reduce energy consumption production costs, improve wear resistance, and reduce the amount of deformation. Effect

Inactive Publication Date: 2018-08-07
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is that the quality of the rails in t...

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment

[0045] Embodiment, 75kg / m 100m online heat treatment rail production method, comprises the following steps:

[0046] 1) Hot metal pretreatment: the sulfur content in the hot metal is 0.013%;

[0047] 2) Converter smelting: control the C content of 0.08% in the tapping process, the tapping temperature is 1640°C, add lime, silicon calcium barium and fluorite after tapping to modify the slag, ensure the argon blowing effect during the tapping process, and the molten steel is refined When the top slag is in place, avoid the phenomenon of clumping;

[0048] 3) Refining in LF furnace: Add high-carbon ferromanganese, low-aluminum ferrosilicon and high-carbon ferrochrome during LF refining, control the slag basicity to 2.2, heating time for 34min, and off-site temperature at 1605°C;

[0049] 4) VD vacuum degassing: the deep vacuum degassing time is 15 minutes, and the soft blowing is 18 minutes after vacuum degassing. The flow of argon gas is stable during the soft blowing process, a...

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PUM

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Abstract

The invention discloses a European-standard R320Cr steel rail. The steel rail is prepared from the following ingredients by weight percent: 0.73 to 0.78% of C, 0.75 to 0.85% of Si, 0.95 to 1.05% of Mn, 0.90 to 0.95% of Cr, smaller than or equal to 0.020% of P, smaller than or equal to 0.025% of S and smaller than or equal to 0.004% of Al. The invention further discloses a producing method of the European-standard R320Cr steel rail. The European-standard R320Cr steel rail producing method disclosed by the invention improves a steel rail producing efficiency and reduces energy consumption and production cost; the obtained European-standard R320Cr steel rail has good straightness, small residual stress and high quality; abrasion resistance is improved, service life is prolonged, rail transportation safety is improved, and a requirement of railway speed increasing development is favorable for being met.

Description

technical field [0001] The invention relates to the technical field of metallurgical materials, in particular to a European standard R320Cr steel rail and a production method thereof. Background technique [0002] With the continuous and rapid development of society, more and more rail transport applications are used. The volume of freight railways and the load capacity of trains are increasing year by year, and the construction of tracks is accelerating. , especially on small-radius curves, the wear of the rails is very serious. The original 880MPa and 980MPa-strength steel rails can no longer meet the needs of railway transportation. In sections with small curve radii, many curves, and heavy loads, problems such as serious wear and tear appear . Therefore, higher requirements are put forward for the strength and hardness of the rail, and higher requirements are also put forward for the quality of the deformation, straightness and joint of the rail. In addition, the curre...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/18E01B5/02
CPCC22C38/02C22C38/04C22C38/18E01B5/02
Inventor 王嘉伟高明星赵桂英郑瑞苏航周彦薛虎东董捷
Owner BAOTOU IRON & STEEL GRP
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