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Bainite/martensite steel rail with 1,500 Mpa level of high toughness and manufacturing method thereof

A bainite and martensite technology, applied in the field of bainite/martensitic rail and its manufacturing, can solve the problem of difficulty in realizing the rail, and achieve the effect of excellent plasticity

Inactive Publication Date: 2012-07-04
METALS & CHEM RES INST CHINA ACAD OF RAILWAY SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, it is difficult for the steel rails of the above reference documents to achieve this effect

Method used

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  • Bainite/martensite steel rail with 1,500 Mpa level of high toughness and manufacturing method thereof
  • Bainite/martensite steel rail with 1,500 Mpa level of high toughness and manufacturing method thereof
  • Bainite/martensite steel rail with 1,500 Mpa level of high toughness and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The following table 1-1 is the chemical composition and corresponding process conditions (cooling and heat treatment conditions) of the embodiment 1 of the rail of the present invention and the comparison rail, wherein the chemical composition refers to the composition and content of each element of the steel, and the balance is Fe and unavoidable impurities. The tempering heating temperature and tempering heating time in Example 1 refer to the tempering temperature and holding time of the entire section of the rail head after heating and cooling.

[0057] Chemical composition and process conditions of the steel rail of Table 1-1 embodiment 1 and the steel rail of comparative example

[0058]

[0059] The comparison of the test results of the examples and the comparative examples are respectively shown in the following figures. Wherein, Table 1-2 is the full-section tensile test result of the steel rail of the present invention; Table 1-3 is the full-section impact ...

Embodiment 2

[0077] Similar to the above-mentioned Example 1, Table 2-1 shows the chemical composition and corresponding process conditions of the rail of the present invention in Example 1 and the comparison rail. In Example 2, the rail head was austenitized by reheating before accelerated cooling, and the tempering temperatures for Example 2 shown in Table 2-1 refer to when the rail head is heated, the rail waist and rail The tempering temperature range to which the bottom is heated at a speed of 3-10°C / s.

[0078] Table 2-1 The chemical composition and process conditions of the steel rail of the present invention and the comparative steel rail

[0079]

[0080] Similarly, table 2-2 is the tensile test result of the rail full section of embodiment 2; Table 2-3 is the rail full section impact performance test result of embodiment 2; Table 2-4 is the rail of embodiment 2 and pearlescent Comparison of the rail head tensile test results of the comparative example of the body shape; Table...

Embodiment 3

[0092] Similar to the above-mentioned embodiment, through multiple tables and combining Figure 8 and 9 To illustrate the improvement of Example 3 of the present invention compared to the rail of the comparative example. Table 3-1 shows the chemical composition and process conditions (heat treatment and cooling conditions) of the rails of Example 3 and the rails of Comparative Example. Table 3-2 shows the rail head tensile test results of Example 3. Table 3-3 shows the test results of the rail head impact performance of Example 3. Table 3-4 is the comparison of the rail head tensile test results of the rail of Example 3 and the rail head of the pearlitic comparative example. Table 3-5 is the comparison of the rail head impact performance of the rail of Example 3 and the rail head of Comparative Example. Figure 8 Shown is the result of the hardness test of the cross-section of the rail head in Example 2. Figure 9 The metallographic structure diagram of the rail head of E...

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Abstract

The invention provides a bainite / martensite steel rail and a manufacturing method thereof. The steel rail is formed by performing steel hot rolling on the following components in percentage by weight: 0.10 to 0.40 percent of C, 0.80 to 2.00 percent of Si, 1.20 to 2.40 percent of Mn, 0.50 to 1.20 percent of Cr, 0.20 to 0.60 percent of Mo, and the balance of Fe and inevitable impurities. The steel rail comprises a rail head, a rail waist and a rail bottom, wherein the rail head is subjected to accelerated cooling at a cooling speed of higher than 1 DEG C / s and lower than and equal to 5 DEG C / s to an accelerated cooling stop temperature of lower than 300 DEG C and higher than 200 DEG C.

Description

technical field [0001] The present invention generally relates to the field of steel rails, in particular to bainite / martensitic steel rails and a manufacturing method thereof. Background technique [0002] In recent years, with the increase of train speed, axle load and transportation density, rail damage has become increasingly serious, especially on small radius curves or switch point rails or wing rails, rail wear, peeling and abrasion are very serious. In particular, on small-radius curves, some rails have been used for less than a year and have passed a total weight of less than 100 million tons, so they have to be replaced due to excessive wear on the side of the rail head; The stripping of the rail surface of the strand rail is also very serious. Some rails have not been on the track for a long time, and the stripping of the rail surface reaches several millimeters, and even induces fatigue and serious injury, causing the rail to fracture horizontally. In addition, ...

Claims

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Application Information

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IPC IPC(8): C22C38/22C22C38/34C22C38/38C22C38/24C22C38/58C22C38/46C22C38/44C21D9/04E01B5/02
Inventor 周清跃张银花陈朝阳刘丰收李闯俞喆梁旭
Owner METALS & CHEM RES INST CHINA ACAD OF RAILWAY SCI
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