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Chlorine ion corrosion-resistant steel rail and preparation method

A chloride ion corrosion and rail technology, applied in the field of metal material production, can solve the problems of shortening rail replacement cycle, reducing rail support strength, increasing rail maintenance and inspection costs, etc., to ensure the safety of passenger production and property, and reduce maintenance and replacement costs , The effect of promoting the development of the railway industry

Active Publication Date: 2020-09-29
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

The amount of railway construction in offshore areas and undersea tunnels is increasing. Due to the proximity to the coastline, chloride ions in seawater settle on the rails in rainfall or with humid ocean atmosphere; Due to the infiltration of seawater, seawater is brought to the rails during train operation. Chloride ions in seawater (about 3.5% chloride ion content) are enriched on the surface of the rails for a long time, causing serious corrosion of the rails. The corrosion rate of rails caused by chloride ions is the inland Several times in the rural atmospheric environment, greatly reducing the life of the rail
At the same time, due to the corrosion of chloride ions, the thickness of the rail waist is rapidly reduced, which greatly reduces the support strength of the rail to the train during operation, and accidents of rail fracture are prone to occur, bringing great safety hazards to train operation.
Due to the serious corrosion of the rails, the maintenance and inspection costs of the rails are increased, and the replacement cycle of the rails is shortened, causing a lot of manpower and maintenance cost pressure on the railway industry

Method used

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  • Chlorine ion corrosion-resistant steel rail and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The components and weight percentages of the steel rails resistant to chloride ion corrosion include C: 0.68%, Si: 0.66%, Mn: 1.02%, P: 0.005%, S: 0.002%, Nb: 0.026%, Als: 0.002%, Cr: 1.28%, Cu: 2.7%, Co: 0.49%, H: 0.00005%, O: 0.0004%, and the rest are Fe and impurity elements.

[0031] 1) Carry out deep desulfurization of molten iron, use converter smelting, and control the tapping temperature at 1661°C;

[0032] 2) Add 46kg of active lime to each ton of molten steel to make white slag for deep deoxidation and desulfurization, then add 37kg of quartz sand to each ton of molten steel, control the slag basicity at 0.8, and LF furnace treatment time for 53min to turn inclusions in steel into plastic inclusions;

[0033] 3) RH vacuum dehydrogenation and oxygen treatment: use low vacuum degree, the treatment time is 26min with pressure ≤ 40Pa;

[0034] 4) For continuous casting of molten steel, the long nozzle of the large tank and the submerged nozzle of the crystallizer...

Embodiment 2

[0041] The components and weight percentages of steel rails resistant to chloride ion corrosion include C: 0.71%, Si: 0.58%, Mn: 0.95%, P: 0.003%, S: 0.002%, Nb: 0.023%, Als: 0.001%, Cr: 1.37 %, Cu: 2.7%, Co: 0.49%, H: 0.00005%, O: 0.0004%, and the rest are Fe and impurity elements.

[0042] 1) Carry out deep desulfurization of molten iron, use converter smelting, and control the tapping temperature at 1666°C;

[0043] 2) Add 48kg of active lime to each ton of molten steel to make white slag for deep deoxidation and desulfurization, then add 39kg of quartz sand to each ton of molten steel, control the slag alkalinity at 0.9, and LF furnace for 55 minutes to turn the inclusions in the steel into plastic inclusions;

[0044] 3) RH vacuum dehydrogenation and oxygen treatment: use low vacuum degree, the treatment time is 23min with pressure ≤ 40Pa;

[0045] 4) For continuous casting of molten steel, the long nozzle of the large tank and the submerged nozzle of the crystallizer are ...

Embodiment 3

[0052] The components and weight percentages of steel rails resistant to chloride ion corrosion include C: 0.73%, Si: 0.62%, Mn: 1.36%, P: 0.004%, S: 0.001%, Nb: 0.028%, Als: 0.002%, Cr: 1.78 %, Cu: 3.1%, Co: 0.51%, H: 0.000035%, O: 0.0002%, and the rest are Fe and impurity elements.

[0053] 1) Carry out deep desulfurization of molten iron, use converter smelting, and control the tapping temperature at 1669°C;

[0054] 2) Add 50kg of active lime to each ton of molten steel to make white slag for deep deoxidation and desulfurization, then add 41kg of quartz sand to each ton of molten steel, control the slag alkalinity at 1.0, and use the LF furnace for 55 minutes to transform inclusions in steel into plastic inclusions;

[0055] 3) RH vacuum dehydrogenation and oxygen treatment: use low vacuum degree, the treatment time is 25min with pressure ≤ 40Pa;

[0056] 4) For continuous casting of molten steel, the long nozzle of the large tank and the submerged nozzle of the crystalli...

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PUM

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Abstract

The invention discloses a chlorine ion corrosion-resistant steel rail and a preparation method. The steel rail comprises the following components of, in weight percentage, 0.66%-0.76% of C, 0.53%-0.73% of Si, 0.9%-1.7% of Mn, less than or equal to 0.012% of P, less than or equal to 0.005% of S, 0.020%-0.030% of Nb, less than or equal to 0.003% of Als, 1.2%-2.2% of Cr, 2%-4% Cu, 0.40%-0.65% of Co,less than or equal to 0.00006% of H, less than or equal to 0.0006% of O, and the balance Fe and impurity elements. By controlling the shape of inclusions and generating a layer of dense barrier layeron the surface layer of the steel rail when the steel rail is rolled, the steel rail is prevented from being corroded by chlorine ions; and when the steel rail is in service in an environment with thehigh chloride ion content (2.2%-3.5%), the relative corrosion resistance of the steel rail is improved to 4 times or more of that of a U75V steel rail and a U71Mn steel rail used by the railway in China.

Description

technical field [0001] The invention belongs to the technical field of metal material production, and in particular relates to a steel rail resistant to chloride ion corrosion and a preparation method thereof. Background technique [0002] With the high-speed construction and development of my country's railways, there are more and more railway history, and the environment for railway construction is becoming more and more complex. The amount of railway construction in offshore areas and undersea tunnels is increasing. Due to the proximity to the coastline, chloride ions in seawater settle on the rails in rainfall or with humid ocean atmosphere; Due to the infiltration of seawater, seawater is brought to the rails during train operation. Chloride ions in seawater (about 3.5% chloride ion content) are enriched on the surface of the rails for a long time, resulting in serious corrosion of the rails. The corrosion rate of rails caused by chloride ions is the inland Several tim...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/26C22C38/38C22C38/30C22C38/20C21C7/06C21C7/064C21C7/00C21C7/10C21D8/00
CPCC22C38/02C22C38/04C22C38/26C22C38/38C22C38/30C22C38/20C21C7/06C21C7/064C21C7/0087C21C7/10C21D8/005
Inventor 朱敏叶佳林庞涛郑建国费俊杰周剑华王瑞敏欧阳珉路赵国知
Owner 武汉钢铁有限公司
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