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A kind of corrosion-resistant bainite steel, steel rail and preparation method

A bainitic steel and bainite technology, applied in the field of rail and preparation, low-carbon 1300MPa grade high-strength corrosion-resistant bainitic steel, to improve corrosion resistance, increase toughness, improve plasticity and atmospheric corrosion resistance. Effect

Active Publication Date: 2018-10-19
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this patent focuses more on both the high strength and corrosion resistance of the rail, and there is a lot of room for improving the toughness level of the rail for protection. At the level of strength 1350MPa, the impact energy at room temperature is only A ku2 ≥40J, the highest impact toughness in the examples is 60J

Method used

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  • A kind of corrosion-resistant bainite steel, steel rail and preparation method
  • A kind of corrosion-resistant bainite steel, steel rail and preparation method
  • A kind of corrosion-resistant bainite steel, steel rail and preparation method

Examples

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Effect test

Embodiment 1

[0049] The corrosion-resistant bainitic steel rail is made of corrosion-resistant bainitic steel, wherein the content of each component of the corrosion-resistant bainitic steel is shown in Table 1. In the CCT curve of the steel, martensitic transformation occurs The critical cooling rate is above 10°C / s. The preparation method of this steel rail is as follows:

[0050] 1) According to the formula of this embodiment in Table 1, adopt conventional steelmaking process, carry out smelting and refining by converter or electric furnace, adopt the mode of continuous casting to carry out casting again, obtain slab;

[0051] 2) Heating the billet to 1250°C, keeping it warm for 2 hours, and then going through billet opening, rough rolling, and finish rolling to obtain the rail prototype, wherein the final rolling temperature of the finish rolling is 900°C;

[0052] 3) The rail prototype is continuously cooled to room temperature by means of strong fog cooling at an average cooling rat...

Embodiment 2

[0056] The corrosion-resistant bainitic steel rail is made of corrosion-resistant bainitic steel, wherein the content of each component of the corrosion-resistant bainitic steel is shown in Table 1. In the CCT curve of the steel, martensitic transformation occurs The critical cooling rate is above 10°C / s. The preparation method of this steel rail is as follows:

[0057] 1) According to the formula of this embodiment in Table 1, adopt conventional steelmaking process, carry out smelting and refining by converter or electric furnace, adopt the mode of continuous casting to carry out casting again, obtain slab;

[0058] 2) Heating the billet to 1200°C, keeping it warm for 2 hours, and then going through billet opening, rough rolling, and finish rolling to obtain a rail prototype, wherein the final rolling temperature of finish rolling is 950°C;

[0059] 3) The rail prototype is cooled continuously to room temperature with an average cooling rate of 5°C / s by means of strong air c...

Embodiment 3

[0062] The corrosion-resistant bainitic steel rail is made of corrosion-resistant bainitic steel, wherein the content of each component of the corrosion-resistant bainitic steel is shown in Table 1. In the CCT curve of the steel, martensitic transformation occurs The critical cooling rate is above 10°C / s. The preparation method of this steel rail is as follows:

[0063] 1) According to the formula of this embodiment in Table 1, adopt conventional steelmaking process, carry out smelting and refining by converter or electric furnace, adopt the mode of continuous casting to carry out casting again, obtain slab;

[0064] 2) Heating the billet to 1200°C, keeping it warm for 2.5 hours, and then going through blanking, rough rolling, and finish rolling to obtain a rail prototype, wherein the final rolling temperature of the finish rolling is 950°C;

[0065] 3) The rail prototype is cooled continuously to room temperature with an average cooling rate of 4°C / s by means of fog cooling;...

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Abstract

The invention discloses a corrosion-resistant bainitic steel. The corrosion-resistant bainitic steel comprises, by weight percentage, 0.15-0.45% of C, 1.80-3.00% of Mn, 0.50-1.20% of Cr, 0.35-0.7% of Mo, 0.50-0.80% of Ni, 0.50-1.50% of Si, 0.3-0.8% of W, less than or equal to 0.020% of Ca, less than or equal to 0.030% of Ce, less than or equal to 0.010% of S, less than or equal to 0.015% of P and the balance Fe and inevitable impurity elements. The microstructure is mainly a bainite / martensite complex phase structure, wherein the weight percentage sum of W and Mo is greater than or equal to 0.9%, and the weight percentage of Ca or S is greater than or equal to 1.5%. The invention further discloses a steel rail prepared from the corrosion-resistant bainitic steel and a preparation method of the steel rail. The steel rail is excellent in comprehensive performance and high in toughness, plasticity and atmosphere corrosion resistance.

Description

technical field [0001] The invention relates to the field of low-alloy high-strength steel. More specifically, it relates to a low-carbon 1300MPa grade high-strength corrosion-resistant bainitic steel with high strength, high toughness, good atmospheric and environmental corrosion resistance, a steel rail and a preparation method. Background technique [0002] With the development of high-speed and heavy-duty railways, the existing pearlitic steel rails cannot meet the needs of railway development, and new bainitic steel rails have become a research hotspot both at home and abroad. At present, a large number of researches on bainitic rails focus on the improvement of mechanical properties, and do not fully consider the different requirements for the service performance of rails in different environments. However, in humid areas in southern my country, coastal high-salt areas, long-distance tunnels and other environments with high humidity and marine climate areas, the exist...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/58C22C38/44C22C38/02C22C33/04C21D8/00C21D9/04
CPCC21D8/005C21D9/04C22C33/04C22C38/002C22C38/005C22C38/02C22C38/44C22C38/58
Inventor 谭谆礼李季苗俊浩高博白秉哲
Owner BEIJING JIAOTONG UNIV
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