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Method for producing Nb-containing high-speed train wheel steel

A production method and high-speed train technology, applied in the field of metal materials, can solve problems such as low impact and fracture toughness, insufficient ferrite ratio, uneven structure, etc., and achieve the goal of improving toughness, overcoming uneven structure, and refining structure Effect

Inactive Publication Date: 2012-07-04
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0016] The present invention adds Nb microalloy elements to the composition design of traditional high-speed train wheel steel, combined with appropriate heat treatment process, solves the main problems of high-speed train wheel steel, including: ① coarse grain; ② uneven structure; ③ iron Insufficient body ratio; ④The impact and fracture toughness values ​​are too low, etc.

Method used

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  • Method for producing Nb-containing high-speed train wheel steel
  • Method for producing Nb-containing high-speed train wheel steel
  • Method for producing Nb-containing high-speed train wheel steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The composition percentage of carbon steel in this microalloy is: C: 0.46%, Mn: 0.80%, Si: 0.40%, Cr: 0.23%, Nb: 0.03%, P: 0.006%, S: 0.0088%, and the rest The amount is Fe and unavoidable elements.

[0035]After smelting and forging, the steel is heated to 900°C, held for 1 hour to fully austenitize it, then air-cooled to room temperature, and the average cooling rate is controlled to 1°C / s through measurement and monitoring. According to the mechanical performance test, the yield strength is 450MPa, the tensile strength is 750MPa, the elongation after fracture is 23.0%, and the impact energy (Akv) at low temperature (-20°C) is 16.7J. Metallographic structure such as figure 1 As shown, the structure at room temperature is ferrite + pearlite, and the proportion of ferrite is 23%. The Nb-containing medium-carbon steel obtained under this process has a fine and uniform structure and stable performance, which can meet the testing requirements of high-speed train wheel w...

Embodiment 2

[0037] The composition percentage of carbon steel in this microalloy is: C: 0.47%, Mn: 0.80%, Si: 0.41%, Cr: 0.24%, Nb: 0.06%, P: 0.013%, S: 0.0089%, and the rest The amount is Fe and unavoidable elements.

[0038] After smelting and forging, the steel is heated to 900°C, held for 1 hour to fully austenitize it, then air-cooled to room temperature, and the average cooling rate is controlled to 1°C / s through measurement and monitoring. According to the mechanical performance test, the yield strength is 455MPa, the tensile strength is 745MPa, the elongation after fracture is 22.3%, and the impact energy (Akv) at low temperature (-20°C) is 19.0J. Metallographic structure such as figure 2 As shown, the structure at room temperature is ferrite + pearlite, and the proportion of ferrite is 24%. The Nb-containing medium-carbon steel obtained under this process has a fine and uniform structure and stable performance, which can meet the testing requirements of high-speed train wheel ...

Embodiment 3

[0040] The composition percentage of carbon steel in this microalloy is: C: 0.47%, Mn: 0.80%, Si: 0.41%, Cr: 0.24%, Nb: 0.06%, P: 0.013%, S: 0.0089%, and the rest The amount is Fe and unavoidable elements.

[0041] After smelting and forging, the steel is heated to 900°C, held for 1 hour to fully austenitize it, and then cooled to room temperature by spraying water, and the average cooling rate is controlled to 12°C / s through measurement and monitoring. According to the mechanical performance test, the yield strength is 530MPa, the tensile strength is 840MPa, the elongation after fracture is 21.1%, and the impact energy (Akv) at low temperature (-20°C) is 19.5J. Metallographic structure such as image 3 As shown, the structure at room temperature is ferrite + pearlite, and the proportion of ferrite is 15%. The Nb-containing medium carbon steel obtained under this process has a fine and uniform structure and stable performance, which can meet the testing requirements of high-...

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Abstract

The invention relates to a method for producing Nb-containing high-speed train wheel steel, and belongs to the field of metal materials. The wheel steel comprises the following components in percentage by weight: 0.40 to 0.70 percent of C, 0.70 to 0.80 percent of Mn, 0.30 to 0.60 percent of Si, 0.015 to 0.110 percent of Nb, 0.20 to 0.35 percent of Cr, less than or equal to 0.020 percent of P, less than or equal to 0.015 percent of S and the balance of Fe and inevitable elements. The method comprises the following steps of: smelting, forging to obtain a steel billet, performing normalization and heat preservation at the temperature of between 850 and 900 DEG C for 1 hour, performing air cooling or water spray cooling to room temperature, and ensuring that cooling speed is controlled in therange of 1 to 15 DEG C / s and a room temperature structure is ferrite and pearlite. The high-speed train wheel steel produced by the method has the tensile strength of 740 to 900MPa, the yield strength of 450 to 570MPa, the breaking elongation of 15 to 25 percent and the low temperature (-20 DEG C) impact work (Akv) of 15 to 20J, and a uniform structure with 10 to 25 percent of ferrite can be obtained at room temperature. The Nb-containing high-speed train wheel steel has mechanical properties of high strength and toughness, and overcomes the defect of a low toughness value of the conventionalhigh and medium carbon wheel steel.

Description

[0001] technical field [0002] The invention belongs to the field of metal materials, and relates to a medium-high carbon wheel steel material, in particular to a composition design and production method of a medium-high carbon steel containing Nb; it is a medium-high carbon steel containing alloy elements such as Nb, Mn, Si, and Cr, and is suitable for It is mainly used in the production of high-strength, high-toughness and performance ratio medium-high carbon high-speed train wheel steel. Background technique [0003] The railway transportation industry has become an important basic industry for the economic development of many countries. All countries have invested a lot of manpower, material and financial resources in the research of developing a higher speed, more stable and safer railway transportation system. The increase in the speed and load of railway trains greatly affects the transportation efficiency of railway traffic. At the same time, it also puts forward h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/26C21D8/00
Inventor 尚成嘉吴斯李秀程贺飞王学敏
Owner UNIV OF SCI & TECH BEIJING
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