High-strength and high-toughness steel rail and preparation method thereof

A high-strength toughness, rail technology, applied in the field of rail manufacturing, can solve the problem of poor toughness and plasticity of heavy-duty rails, achieve excellent strength and toughness, and improve the effect of toughness and plasticity of rails

Inactive Publication Date: 2021-11-12
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Aiming at the problem of poor toughness and plasticity of heavy-duty rails, the invention provides a rail with high strength and toughness and a preparation method thereof

Method used

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  • High-strength and high-toughness steel rail and preparation method thereof
  • High-strength and high-toughness steel rail and preparation method thereof
  • High-strength and high-toughness steel rail and preparation method thereof

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preparation example Construction

[0032] A first aspect of the present invention provides a method for preparing a high-strength toughness steel rail, the method comprising the following steps:

[0033] (1) Low-S molten iron is put into the furnace, and the molten steel is softly blown with argon under the protection of high-alkalinity refining slag to homogenize the alloy composition. The argon blowing time is 5 minutes to 10 minutes.

[0034](2) The molten steel after argon blowing in step (1) is refined by electric heating in the LF furnace and the main alloy components are precisely regulated. After the LF refining is completed, the RH vacuum cycle degassing treatment is performed, and the obtained molten steel is passed through the continuous casting process. A rail billet is formed. The composition of the rail billet needs to meet the following requirements in terms of mass percentage: C: 0.65-0.85%, Si: 0.3-0.8%, Mn: 0.5-1.0%; Cr: 0.5-1.2%; V: 0.05-0.13%, S≤ 0.008%, P≤0.025%, the balance is Fe and unav...

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Abstract

The invention discloses a preparation method of a high-strength and high-toughness steel rail. The method comprises the following steps: preparing a steel rail casting blank; the steel rail casting blank is heated to 1230-1280 DEG C, and the soaking time is 2-4 h; the heated steel rail casting blank is rolled into the steel rail, the initial rolling temperature ranges from 1120 DEG C to 1180 DEG C, the final rolling temperature ranges from 900 DEG C to 950 DEG C, and the final rolling deformation ranges from 10% to 15%; and the rolled steel rail is subjected to online heat treatment through waste heat, the steel rail with the waste heat is placed in air to be cooled, when the center temperature of the top face of the steel rail is smaller than or equal to 800 DEG C, a cooling medium is sprayed to a rail head of the steel rail, the rail head of the steel rail is cooled to 400-500 DEG C in an accelerated mode, and then the steel rail continues to be cooled to the room temperature in the air. The invention further discloses the high-strength and high-toughness steel rail prepared through the method. Through steel rail component optimization and controlled rolling and controlled cooling processes, the pearlite lamellar refinement of the steel rail is realized, so that the toughness and plasticity of the steel rail are improved.

Description

technical field [0001] The invention belongs to the technical field of rail manufacturing, and specifically relates to a high-strength toughness rail and a preparation method thereof. Background technique [0002] With the rapid development of my country's heavy-duty line transportation, the axle load of trains is gradually upgrading from the current general 27t to 30t, and at the same time, more stringent requirements are put forward for the strength and hardness of the rails. Therefore, in order to meet the needs of railways for the wear resistance of rails, the strength and hardness of rails are constantly improving. For example, the Daqin heavy-duty line has gradually transitioned from the original 1180MPa U75V rails to 1280MPa U78CrV rails, and some lines are being trial-laid with 1330MPa U95Cr rails. Eutectic rails. However, increasing the strength and hardness of the rails is often accompanied by a decrease in the toughness and plasticity of the rails, which will bri...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/24C21D8/00B21B1/085B21B37/74
CPCC22C38/02C22C38/04C22C38/24C21D8/005B21B1/085B21B37/74C21D2211/009
Inventor 李晓煜袁俊汪渊陈崇木
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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