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Method for improving susceptibility of flake formation of wheel steel by using second phase in steel

A steel white spot and sensitivity technology, applied in the direction of improving process efficiency, can solve the problems of several hours or even tens of hours, affecting the production cycle of the wheel, and consuming large energy, so as to achieve less alloying elements and reduce white spot sensitivity Sexuality, the effect of increasing production costs

Inactive Publication Date: 2012-02-29
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The other is to further reduce the hydrogen concentration in the steel through heat treatment. Due to the large cross-section of the wheel, it takes several hours or even ten hours to diffuse most of the hydrogen through heat treatment, which not only consumes a lot of energy, but also affects the production cycle of the wheel.

Method used

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  • Method for improving susceptibility of flake formation of wheel steel by using second phase in steel
  • Method for improving susceptibility of flake formation of wheel steel by using second phase in steel
  • Method for improving susceptibility of flake formation of wheel steel by using second phase in steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: adopt general smelting equipment, press the component and content of label 1 of table 1, adopt common smelting process to smelt, and continuously cast into round billet; heat treatment. The performance test results are shown in Table 2.

Embodiment 2

[0017] Example 2: Repeat the method of Example 1 according to the components and contents of the number 2 in Table 1, respectively, and process it, and see Table 2 for performance testing.

Embodiment 3

[0018] Example 3: Repeat the method of Example 1 according to the components and contents of No. 3 in Table 1, respectively, and process it, and see Table 2 for performance testing.

[0019] The tensile properties at room temperature obtained by testing according to GB7314-1987 are shown in Table 2. Table 2 also lists the critical hydrogen concentration at which white spots appear for different materials. It can be seen from the table that compared with Example 1, the critical hydrogen concentration at which white spots appear in the samples of Examples 2 and 3 is significantly increased, and the tensile properties are basically unchanged.

[0020] In summary, the present invention can significantly reduce the white spot sensitivity of the wheel steel, and has no adverse effect on the mechanical properties of the wheel steel.

[0021] Table 1

[0022]

[0023] Table 2

[0024]

[0025]

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Abstract

The invention discloses a method for improving susceptibility of flake formation of wheel steel by using a second phase in steel, and belongs to the technical field of new material metallurgy. The method mainly comprises the following steps of: separating fine dispersive second-phase particles in the steel through a controlled rolling process by selecting and adding a proper trace alloy element; after degassing molten steel through VD (Vacuum Distillation), increasing acid-soluble aluminum Als in the steel to 0.025-0.030 percent by weight before continuous casting; stirring and then increasing Ti to 0.015-0.025 percent by weight and increasing alloy element V to 0.015-0.025 percent by weight by adding the alloy element; then, performing controlled rolling on the wheel steel at the temperature of 1,180-1,250 DEG C to further react N with Ti and V to separate produced nano-scale TiN and VN so as to form a hydrogen trap; meanwhile, refining crystal grains, increasing grain boundary proportion and suppressing flake formation. By using the method, critical hydrogen concentration of flake formation of the wheel steel is increased, and the susceptibility of flake formation is reduced. The mechanical property of the wheel steel is not reduced.

Description

technical field [0001] The invention relates to the improvement of wheel steel structure, in particular to the use of second phase precipitation as a trap for residual hydrogen in the steel to improve its white spot sensitivity comprehensive performance, and belongs to the technical field of new material metallurgy. Background technique [0002] Wheels are an important part of train operation. The performance and quality of wheels are related to the safety of train operation. Especially with the rapid development of railway transportation towards high speed and heavy load, higher requirements are put forward for the quality and performance of wheels and tires. Require. The white spot in the wheel steel is one of the defects that endanger the safe operation of the wheel, and it is not allowed to appear in the wheel and tire. White spots are caused by residual hydrogen in steel. It is traditionally believed that when the hydrogen concentration in steel is lower than 2ppm, whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C22C33/04C21D8/00
CPCY02P10/20
Inventor 任学冲李高洋高克玮宿彦京
Owner UNIV OF SCI & TECH BEIJING