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Bainitic steel for frog core rail and manufacturing method thereof

A bainitic steel and frog technology is applied in the field of bainitic steel for frog core rail and its manufacturing, which can solve the problems of uneven structure, peeling off blocks, unstable performance, etc., and achieve stable structure and performance, Optimized composition, avoids the effect of uneven tissue

Active Publication Date: 2020-08-21
METALS & CHEM RES INST CHINA ACAD OF RAILWAY SCI +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the impact toughness at room temperature is 90J / cm 2 , but this kind of bainite steel is easy to form twin martensite due to its high C content, which makes its hardness and strength too high (hardness reaches 45HRC, tensile strength is 1550MPa), but sacrifices toughness and plasticity, which affects railway Frog service life
[0008] At present, my country mainly adopts the method of small furnace smelting-forging-heat treatment to manufacture bainitic steel frog rails. The advantage is that the ideal forging ratio range can be obtained; Unevenness, unstable performance, defects such as wear and peeling off blocks after being on the track, not only seriously affect the service life of the frog core rail, but also cause safety hazards to the train running, and cannot be mass-produced

Method used

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  • Bainitic steel for frog core rail and manufacturing method thereof
  • Bainitic steel for frog core rail and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1 A kind of bainitic steel for frog core rail and its preparation method

[0037] The chemical composition (wt%) of the bainite steel for the frog rail in this embodiment is: C 0.30, Mn 1.79, Si 1.61, Cr 0.98, Ni 0.36, Mo 0.41, Cu 0.01, Al 0.007, V 0.10 , Ti 0.005, and the rest are iron and unavoidable impurities.

[0038] The bainite steel for the frog core rail of this embodiment is prepared through the following steps:

[0039] ①Bloom continuous casting: according to the conventional process of rail bloom continuous casting, the raw materials are smelted in a converter-refining-vacuum treatment-bloom continuous casting to obtain a steel billet with a size of 380×280mm;

[0040] ②Rolling process: the heating rate of the billet is ≤120°C / h, heated to 1250°C, the starting rolling temperature is 1150°C, and the final rolling temperature is 850°C, and the billet obtained in step ① is rolled into a rectangular billet of 185×125mm;

[0041] ③Forging process: the ...

Embodiment 2

[0045] Example 2 A kind of bainitic steel for frog core rail and its preparation method

[0046] The chemical composition (wt%) of the bainite steel for the frog rail in this embodiment is: C 0.30, Mn 1.79, Si 1.61, Cr 0.98, Ni 0.36, Mo 0.41, Cu 0.01, Al 0.007, V 0.10 , Ti 0.005, and the rest are iron and unavoidable impurities.

[0047] The bainite steel for the frog core rail of this embodiment is prepared through the following steps:

[0048] ① Bloom continuous casting: according to the conventional process of rail bloom continuous casting, the raw materials are smelted in a converter-refining-vacuum treatment-bloom continuous casting to obtain a billet with a size of 380*280mm;

[0049] ②Rolling process: the heating rate of the billet is ≤120°C / h, heated to 1250°C, the starting rolling temperature is 1150°C, and the final rolling temperature is 850°C, and the billet obtained in step ① is rolled into a rectangular billet of 185×125mm;

[0050] ③Forging process: the heat...

Embodiment 3

[0054] Example 3 A kind of bainitic steel for frog core rail and its preparation method

[0055] The bainite steel for frog core rail in this embodiment has the following chemical composition (wt%): C 0.29, Mn 1.78, Si1.60, Cr: 0.98, Ni: 0.35, Mo: 0.41, Cu: 0.01, Al : 0.007, V: 0.10, Ti: 0.005, and the rest are iron elements and unavoidable impurities.

[0056] According to the same preparation method as Example 1, the bainite steel for frog rail of this embodiment was prepared. The mechanical properties of its service state are: R m =1353MPa, R p0.2 =1057Mpa, A=17%, Z=52%, A KU2 =85J, HRC=42.

[0057] The 500-fold and 1000-fold magnification microstructure images of the bainitic steel for frog core rails obtained in this example also show that the bainitic ferrite laths are evenly arranged (micrographs omitted).

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Abstract

The invention provides bainite steel for a frog point rail and a preparation method thereof. The bainite steel is prepared from the following components in percent by weight: 0.25-0.32% of C, 1.0-2.0%of Mn, 0.8-1.7% of Si, 0.5-1.5% of Cr, 0.1-0.6% of Ni, 0.1-0.7% of Mo, 0-0.1% of Cu, 0-0.1% of Al, 0-0.3% of V, 0-0.1% of Ti and the balance ferrum and inevitable impurities. The bainite steel provided by the invention is uniform in tissue and high in stability, has excellent contact fatigue resistance and wear resistance and is long in service life. The preparation process of a steel product isstable and the steel product can be produced in batches.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a bainitic steel for a frog core rail and a manufacturing method thereof. Background technique [0002] Bainitic steel has high strength and high toughness. Bainitic frog core rails exhibit good wear resistance and contact fatigue resistance, and have good weldability. They are used to manufacture frog cores for heavy-duty railways. One of the ideal materials for rails. [0003] At present, my country's railway operating mileage has exceeded 120,000 kilometers, and the number of turnouts in use has reached 190,000. With the continuous development of my country's railway industry in the direction of heavy load, the requirements for the performance of steel rails and turnouts are getting higher and higher. Frog rails are a key component of rail lines and one of the most damaged structures. Frog center rails must have appropriate mechanical properties in order to ensure driv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/58C22C38/34C22C38/44C22C38/42C22C38/46C22C38/50C22C38/06C21D8/00C21D1/26C21D1/28C21D1/20E01B7/10
CPCC21D1/20C21D1/26C21D1/28C21D8/005C21D2211/002C21D2211/005C22C38/02C22C38/04C22C38/06C22C38/34C22C38/42C22C38/44C22C38/46C22C38/50C22C38/58E01B7/10
Inventor 周清跃林云蕾张银花刘丰收李闯俞喆梁旭
Owner METALS & CHEM RES INST CHINA ACAD OF RAILWAY SCI
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