Bainite rail steel with ultra-low aluminium content and high strength and production method thereof

A production method and rail steel technology, applied in the field of rail steel, can solve problems such as hard alumina inclusions, alumina inclusions, and elevation, so as to improve fatigue resistance and service life, ensure the ability to remove inclusions, and improve purity Effect

Inactive Publication Date: 2018-12-18
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the total aluminum content is high, the aluminum content entering the steel with the ferroalloy will increase significantly, and a large amount of alumina inclusions will be formed. The alumina inclusions are hard and brittle, and they are broken into chains during the rolling process. Stress concentration is easy to form during use, which can turn into nuclear damage or even broken rail in severe cases, thereby reducing the fatigue resistance and service life of the rail

Method used

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  • Bainite rail steel with ultra-low aluminium content and high strength and production method thereof
  • Bainite rail steel with ultra-low aluminium content and high strength and production method thereof
  • Bainite rail steel with ultra-low aluminium content and high strength and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for producing high-strength bainite rail steel with ultra-low aluminum content, comprising the steps of:

[0034] 1) Desulfurization pretreatment: The blast furnace molten iron is desulfurized by spraying magnesium powder combined with slag removal. The desulfurization of molten iron is based on gas as a carrier to spray desulfurizer into molten iron through a spray gun to react with sulfur in molten iron. , so as to achieve the purpose of desulfurization, the reaction product floats into the slag, and the top slag is removed by mechanical equipment to ensure that the sulfur content of the molten iron entering the converter is ≤0.015%.

[0035] 2) Converter smelting: Converter top-bottom compound blowing is adopted, and the oxygen supply intensity is 18000-23000Nm 3 / h, the blowing time is 910s, the final slag basicity is controlled at 3.2, the carbon content at the end of blowing is 0.05%, the phosphorus content at the end is ≤0.012%, the tapping temperature is...

Embodiment 2～8

[0043] The implementation process is the same as Example 1 except for the following differences. Table 1 and Table 2 are the main process parameters of each example, and Table 3 is the chemical composition of steel and the control level of alumina inclusions in each example.

[0044] Table 1

[0045]

[0046] Table 2

[0047]

[0048] table 3

[0049]

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Abstract

The invention discloses bainite rail steel with an ultra-low aluminium content and high strength and a production method thereof. The rail steel comprises the chemical components of, by weight, 0.10%-0.25% of C, 1.50%-1.90% of Si, 1.40%-1.90% of Mn, less than or equal to 0.025% of P, less than or equal to 0.025% of S, 1.10%-1.50% of Cr, 0.40-0.70% of Mo, 0.40%-0.75% of Ni, 0.04%-0.15% of V, less than or equal to 0.004% of Alt and the balance Fe and unavoidable impurities. The production method adopts top-bottom combined blowing converter smelting, LF refining and RH vacuum treatment, the totalaluminum content of the bainite rail steel can be effectively controlled below 40*10<-4>%, and the harm of alumina inclusions in the steel is effectively reduced.

Description

technical field [0001] The invention relates to a rail steel suitable for application in the railway field, in particular to an ultra-low aluminum content high-strength bainitic rail steel and a production method thereof. Background technique [0002] my country has a vast territory and a large population. Railways are considered the most important means of transportation, and their transportation pressure is far greater than that of other countries. As the supporting material of the railway, the performance and service life of steel rails need to be continuously improved to meet the harsh transportation conditions. Bainitic rails have high strength and good toughness and plasticity, and can maintain extremely high toughness under the condition of ensuring high strength, which can reach up to 5 times that of pearlitic rail steel. It is an internationally recognized high-quality steel grade. [0003] The bainite rail steel adopts low-carbon high-alloy steel, the total alloy ...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/34C22C38/58C22C38/46C22C38/06C22C33/04C21C5/28C21C7/10
CPCC21C5/28C21C7/10C22C33/04C22C38/02C22C38/04C22C38/06C22C38/34C22C38/44C22C38/46C22C38/58
Inventor 郑建国周剑华朱敏王瑞敏费俊杰徐志东
Owner 武汉钢铁有限公司
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