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Rolling contact fatigue resistant steel rail for passenger and freight mixed transportation railway and production method of rolling contact fatigue resistant steel rail

A rolling contact fatigue, passenger and cargo mixed transportation technology, applied in the field of metallurgy, can solve problems such as rolling contact fatigue damage, achieve good matching, easy to popularize and apply, and improve comprehensive performance and service life.

Pending Publication Date: 2022-06-28
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The present invention aims at the problem that rolling contact fatigue damage is easy to occur on rails of passenger and cargo mixed transport lines at present, and provides a rolling contact fatigue-resistant high-strength toughness steel rail and a production method thereof. Good match between the yield ratio of the rail head and the impact toughness of the rail waist, thereby improving the comprehensive performance and service life of the rail and meeting the needs of railway development

Method used

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  • Rolling contact fatigue resistant steel rail for passenger and freight mixed transportation railway and production method of rolling contact fatigue resistant steel rail
  • Rolling contact fatigue resistant steel rail for passenger and freight mixed transportation railway and production method of rolling contact fatigue resistant steel rail

Examples

Experimental program
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Effect test

Embodiment 1

[0053] Hot metal desulfurization adopts magnesium powder desulfurization process; converter smelting adopts top-bottom re-blowing process, and the tapping temperature is controlled at 1660 °C; Vacuum treatment, the treatment time of vacuum pressure ≤50Pa is 18min, the bottom blowing argon pressure is 0.45MPa, and the soft blowing time is 10min; during the continuous casting process, the long nozzle of the large tank and the immersion nozzle of the crystallizer are used to protect the pouring, and the immersion depth is 60mm. The billet pulling speed is controlled at 0.45m / min, and the billet is slowly cooled; the billet is heated by a walking beam heating furnace, the heating temperature is 1230°C, and the holding time is 180min; the rolling temperature is 1110°C, and the compression ratio in the rough rolling stage is ≥5.8 , the final rolling temperature is 840 °C, the compression ratio in the finishing rolling stage is ≥2.2; the rail head is subjected to online accelerated co...

Embodiment 2

[0054] Example 2: The molten iron desulfurization adopts the magnesium powder desulfurization process; the converter smelting adopts the top-bottom re-blowing process, and the tapping temperature is controlled at 1680 ° C; ; RH adopts deep vacuum treatment, the treatment time of vacuum pressure ≤50Pa is 20min, the bottom blowing argon pressure is 0.50MPa, and the soft blowing time is 8min; the continuous casting process adopts large tank long nozzle and crystallizer immersion nozzle to protect the pouring, immersion depth At 65mm, the billet pulling speed is controlled at 0.50m / min, and the billet is slowly cooled; the billet is heated by a walking beam heating furnace, the heating temperature is 1220°C, and the holding time is 200min; the rolling temperature is 1090°C, and the rough rolling stage The compression ratio is ≥5.8, the final rolling temperature is 850 °C, and the compression ratio in the finishing rolling stage is ≥2.2; the rail head is subjected to online accelera...

Embodiment 3

[0055] Example 3: The molten iron desulfurization adopts the magnesium powder desulfurization process; the converter smelting adopts the top-bottom re-blowing process, and the tapping temperature is controlled at 1660 ° C; ; RH adopts deep vacuum treatment, the treatment time of vacuum pressure ≤ 50Pa is 16min, the bottom blowing argon pressure is 0.40MPa, and the soft blowing time is 11min; the continuous casting process adopts the long nozzle of the large tank and the immersion nozzle of the crystallizer to protect the pouring, the immersion depth At 65mm, the billet pulling speed is controlled at 0.55m / min, and the billet is slowly cooled; the billet is heated by a walking beam heating furnace, the heating temperature is 1240°C, and the holding time is 210min; the rolling temperature is 1120°C, and the rough rolling stage The compression ratio is ≥5.8, the final rolling temperature is 855℃, and the compression ratio in the finishing rolling stage is ≥2.2; the rail head is su...

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Abstract

The invention discloses a rolling contact fatigue resistant steel rail for a passenger and freight mixed transportation railway. The rolling contact fatigue resistant steel rail is characterized by comprising the following chemical components in percentage by weight: 0.75 to 0.88 percent of C, 0.10 to 0.60 percent of Si, 0.75 to 1.30 percent of Mn, 0.20 to 0.55 percent of Ni, 0.10 to 0.20 percent of V, 0.03 to 0.06 percent of Nb, less than or equal to 0.025 percent of P, less than or equal to 0.025 percent of S and the balance of Fe and inevitable impurities. The production process comprises the following procedures of molten iron desulphurization, converter smelting, LF refining, vacuum treatment, continuous casting, casting blank heating, rolling, accelerated cooling and straightening. By reasonably setting chemical components and smelting and rolling processes, the rail head, the rail web and the rail bottom of the rolled steel rail are subjected to accelerated cooling at different cooling speeds, so that the yield ratio of the rail head of the steel rail is well matched with the impact toughness of the rail web, the comprehensive use performance of the steel rail is improved, the service life of the steel rail is prolonged, and the development requirements of railways are met; the method is simple, high in operability and easy to popularize and apply.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a rolling contact fatigue-resistant steel rail for a passenger-cargo mixed railway and a production method thereof. Background technique [0002] With the rapid development of my country's railways in the direction of "high-speed passenger transportation and heavy-duty freight", the running speed, load capacity and running density of trains increase, and the rolling contact fatigue damage of rails increases significantly, especially in the small radius of mixed passenger and freight transportation. In the curved line, under the repeated action of wheel-rail contact stress, the rail is prone to rolling contact fatigue damage such as fish scale damage, peeling off blocks or even nuclear damage, which seriously affects the service life of the rail and the driving safety. [0003] In the process of wheel-rail contact, the rail is subjected to huge contact stress, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/08C22C38/12C22C33/04B21B1/085B21B37/74C21C7/10C21C7/00C21C7/064B22D11/00C21D11/00C21D8/00E01B5/02
CPCC22C38/02C22C38/04C22C38/08C22C38/12C22C33/04B21B1/085B21B37/74C21C7/10C21C7/0075C21C7/064B22D11/001C21D11/005C21D8/005E01B5/02C21D2211/009
Inventor 费俊杰周剑华刘芳鸣朱敏何文骥欧阳珉路
Owner 武汉钢铁有限公司