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Corrosion resistant spring steel for high-speed railway spring rods and production method thereof

A technology of high-speed railway and production method, applied in the field of metallurgy, can solve problems such as failure during overhaul, erosion, surface pitting of spring strips, etc., and achieve the effects of improved corrosion resistance, broad application prospects, and improved pitting resistance.

Inactive Publication Date: 2017-07-14
SHIJIAZHUANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the man-made damage caused by the brutal construction of the clip installation process, the direct discharge of dirt in the toilet of the high-speed railway, long-term exposure to the atmosphere and continuous rain and snow erosion, and in the humid environment underground such as tunnels and culverts, the surface of the high-speed rail clip is durable. The corrosion layer is very prone to local damage, resulting in local pitting on the surface of the spring, so that the life of the spring cannot reach the overhaul period of 8-12 years and early failure occurs

Method used

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  • Corrosion resistant spring steel for high-speed railway spring rods and production method thereof
  • Corrosion resistant spring steel for high-speed railway spring rods and production method thereof
  • Corrosion resistant spring steel for high-speed railway spring rods and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Corrosion-resistant spring steel for high-speed railway clips, see Table 1 for chemical composition and mass percentage.

[0040] The steel is rolled into Ф14mm spring steel, the hardness and mechanical properties are shown in Table 2.

[0041] The production method of corrosion-resistant spring steel for high-speed railway clips is as follows:

[0042] Converter smelting→LF refining→VD vacuum degassing→continuous casting→continuous casting slab heating→rolling;

[0043] Converter smelting: Converter smelting controls the C content at the end point of 0.09%, and the tapping temperature is controlled at 1640°C; during the tapping process, carburizers and alloy materials are added to make the chemical composition reach the lower limit of the target range; during the tapping process, pre-deoxidation is added and steel core is added Aluminum 1.0kg / ton of steel; slagging during tapping, adding lime 5.0kg / ton of steel and refining slag 4.0kg / ton of steel.

[0044] LF refini...

Embodiment 2

[0050] Corrosion-resistant spring steel for high-speed railway clips, see Table 1 for chemical composition and mass percentage.

[0051] The steel is rolled into Ф14mm spring steel, the hardness and mechanical properties are shown in Table 2.

[0052] The production method of corrosion-resistant spring steel for high-speed railway clips is as follows:

[0053] Converter smelting→LF refining→VD vacuum degassing→continuous casting→continuous casting slab heating→rolling;

[0054] Converter smelting: Converter smelting controls the C content at the end point of 0.11%, and the tapping temperature is controlled at 1650°C; during the tapping process, carburizers and alloy materials are added to make the chemical composition reach the lower limit of the target range; pre-deoxidation during tapping, adding steel core 1.5kg / ton of aluminum for steel; 5.5kg / ton of lime and 4.5kg / ton of refining slag for slagging during tapping.

[0055] LF refining: graphite electrode is heated, and 4...

Embodiment 3

[0061] Corrosion-resistant spring steel for high-speed railway clips, see Table 1 for chemical composition and mass percentage.

[0062] The steel is rolled into Ф14mm spring steel, the hardness and mechanical properties are shown in Table 2.

[0063] The production method of corrosion-resistant spring steel for high-speed railway clips is as follows:

[0064] Converter smelting→LF refining→VD vacuum degassing→continuous casting→continuous casting slab heating→rolling;

[0065] Converter smelting: Converter smelting controls the C content at the end point of 0.10%, and the tapping temperature is controlled at 1650°C; during the tapping process, carburizers and alloy materials are added to make the chemical composition reach the lower limit of the target range; during the tapping process, pre-deoxidation is added and steel core is added Aluminum 0.5kg / ton of steel; slagging during tapping, adding lime 3.5kg / ton of steel and refining slag 3.0kg / ton of steel.

[0066] LF refini...

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Abstract

The invention discloses a corrosion-resistant spring steel for high-speed railway spring bars and a production method thereof. The chemical composition and mass percentage of the corrosion-resistant spring steel are as follows: C: 0.50-0.60%, Si: 1.40-2.20%, Mn : 0.70~1.00%, Cr: 0.36~0.50%, Ni: 0.36~0.60%, Cu: 0.26~0.50%, P: 0.015~0.030%, S≤0.015%, and the balance is Fe and unavoidable impurity elements. The production method includes converter smelting, LF refining, VD vacuum degassing, continuous casting, continuous casting slab heating, and rolling processes; in the converter smelting process, the C content at the control end point is ≥0.08%, and the tapping temperature is controlled at 1640±30°C. The invention satisfies the requirements of the standard on the mechanical properties of the spring steel under the conventional production process conditions of the spring steel through proper component design. After the spring is made according to the existing high-speed railway spring production process, the corrosion resistance of the steel body is significantly improved, and it has broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a corrosion-resistant spring steel for high-speed railway spring bars and a production method thereof. Background technique [0002] With the rapid development of China's high-speed railway, the demand for spring steel for high-speed railway clips has increased sharply. The elastic strip is the most important part of the railway track fastener system. It mainly uses the energy stored during elastic deformation to reduce vibration and impact. Due to the high speed of the high-speed railway, the amplitude and load of the clips in use are larger than those of ordinary line clips, so they are more sensitive to small surface defects such as corrosion pits. [0003] The surface of the high-speed railway clip is sprayed before installation, that is, the surface is covered with a layer of organic matter to improve the corrosion resistance of the clip surface. Due to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/42C22C38/34C22C38/02C22C38/04C21D8/02
CPCC22C38/42C21D8/0205C21D8/0226C22C38/002C22C38/02C22C38/04C22C38/34
Inventor 李绍杰孙晓明戴观文张立良马学辉陈红卫张立刚樊一丁
Owner SHIJIAZHUANG IRON & STEEL
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