Wearproof and tough quasi bainite points and rails and their production

A high-strength toughness, production technology technology, applied in the field of railway turnout rails, can solve the problems that the comprehensive performance index of the rail is not optimal, flashing occurs, and the short one is only more than 2 months, etc., to achieve excellent wear resistance and anti-stripping The effect of uniform performance and hardness and good wheel-rail matching relationship

Inactive Publication Date: 2004-07-07
ANGANG STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The average service life of the curved point rail is no more than 200 days, and the shortest is only more than 2 months, all of which are replaced due to crushing and lateral wear exceeding the limit
[0005] 2. When the point rail is used for 1 to 3 months, flashing will appear. If it is not polished in time, it will continue to fall off, and the length of the continuous falling block can be nearly hundreds of millimeters
After the rail tip flashes, it is generally polished with a portable grinding wheel, which not only brings a lot of work to the site maintenance, but also affects the safety of driving
[0006] 3. Both the tip rail and the frog center (made of M13 steel) are made of high carbon steel, so welding is very difficult and the quality is not stable
[0009] Document CN1175980A introduces the chemical composition and post-rolling cooling method of a bainitic steel rail, but does not put forward specific requirements for the control of smelting and rolling process in the production process and the process or details of controlled cooling after hot rolling. Performance indicators are not optimal

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  • Wearproof and tough quasi bainite points and rails and their production
  • Wearproof and tough quasi bainite points and rails and their production
  • Wearproof and tough quasi bainite points and rails and their production

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Embodiment Construction

[0046] The high-strength and toughness meta-bainite turnout rail we invented with excellent wear resistance does not use the forced cooling process after rolling. Under this process condition, boron should not be used as an alloying element. This is because the rail head section of the switch rail is larger. When air-cooled after rolling, the cooling rate of the rail head is slow. This cooling condition is not enough to inhibit the segregation of boron in the grain boundary. The boron in the steel will form boride and precipitate along the grain boundary. figure 1 , The boride phase precipitated along the grain boundary deteriorates the mechanical properties of the steel, especially the plastic toughness drops sharply (see 1 in Table 1 # Composition and properties of steel). The safety of use of the turnout rails cannot be guaranteed.

[0047] As attached figure 2 Shown: when the pseudo-bainitic steel is alloyed with Al or deoxidized with aluminum, if the nitrogen content in the s...

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Abstract

A high-strength and high-toughness antiwear quasi-bainite rail for switch contains C (0.1-0.4 wt.%), Si (0.8-2.0), Mn (0.8-3.3), Cr (0-2.0), Mo (0.1-0.8), N (10-150 ppm), Al (0-0.005) and Fe (rest), and is made up through smelting in converter, reinfing, treating with RE, vacuum degassing, conticasting, rolling, air cooling to 400 deg.C, slow cooling to 200 deg.C and natural cooling. Its advantages are uniform hardness in cross section, high strength, toughness and stability, and high antiwear performance.

Description

Technical field [0001] The invention relates to a railway turnout steel rail, in particular to a quasi-bainite turnout steel rail with wear resistance, high strength and toughness, and a production process thereof. Background technique [0002] Turnout is one of the weak links of line equipment. With the increase and improvement of the total weight and speed of the passing switch year by year, the impact and wear between the wheel and the rail when the train passes through the turnout are becoming more and more serious, especially when the train passes through the switch part of the turnout, the sharp rolling injury and lateral wear problem Especially prominent. The AT point rail processed by the switch rail is one of the important parts of the frog. It guides the running direction of the train, bears the squeeze, impact and wear of the moving wheels, and its performance is directly related to the safety and efficiency of railway operations. [0003] At present, domestic railways...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C22C38/22C22C38/34C22C38/38E01B7/00
Inventor 赵素华张绪平王立来栗荣全宁东王道远潘玲杨玉
Owner ANGANG STEEL CO LTD
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