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Rolled steel rail with high low-temperature impact performance and production method thereof

A low-temperature impact and production method technology, applied in the field of steelmaking, can solve the problems of low yield and surface quality, high production cost of heat-treated rails, and achieve high yield and rail surface quality, good promotion value, and good tensile strength. Effect

Inactive Publication Date: 2020-04-21
BAOTOU IRON & STEEL GRP
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  • Claims
  • Application Information

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Problems solved by technology

However, the production cost of heat-treated rails is high, and the yield and surface quality are low

Method used

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  • Rolled steel rail with high low-temperature impact performance and production method thereof
  • Rolled steel rail with high low-temperature impact performance and production method thereof

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Embodiment Construction

[0009] Objectively existing environmental conditions require that the low-temperature performance of rails be more prominent, especially in alpine regions where the operating capacity is enhanced, and the performance requirements for rails working in low-temperature environments are significantly increased, including higher requirements for tread hardness and toughness. The object of the present invention is to provide a steel rail with high strength, wear resistance and high impact toughness, which is suitable for alpine regions and its preparation method.

[0010] When the present invention produces rolled steel rails with high low-temperature impact performance, the iron and steel materials used contain the following chemical components in mass percentages: C 0.60-0.75; Si 0.45-0.80; Mn0.85-1.20; Cr0.15-1.0; V0. 02~0.10; P≤0.025; S≤0.025; the amount of RE alloy added is 0.002~0.01%; the rest is Fe and unavoidable impurities.

[0011] The main alloying elements Si, Mn, Cr, a...

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Abstract

The invention discloses a rolled steel rail with high low-temperature impact performance. The raw material of the rolled steel rail contains the following chemical components of, in percentage by mass, 0.60%-0.75% of C, 0.45%-0.80% of Si, 0.85%-1.20% of Mn, 0.15%-1.0% of Cr, 0.02%-0.10% of V, less than or equal to 0.025% of P, less than or equal to 0.025% of S, 0.002%-0.01% of the adding amount ofthe RE alloy, and the balance Fe and inevitable impurities. The mechanical properties of the rolled steel rail with the high low-temperature impact property are as follows, the yield strength is greater than or equal to 580 MPa, the tensile strength is greater than or equal to 1029 MPa, the yield ratio is less than or equal to 0.58, the elongation is greater than or equal to 14.5%, the Brinell hardness is greater than or equal to 302 HB, and the impact energy at minus 40 DEG C is greater than or equal to 13.5 J; and the rolled steel rail has good tensile strength, tread hardness, low-temperature toughness and impact energy.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to a rolled steel rail with high low-temperature impact performance and a production method thereof, in particular to a rolled steel rail with high low-temperature impact performance for alpine regions and a production method thereof. Background technique [0002] According to the white paper "China's Transportation Development", as of the end of 2016, the operating mileage of China's railways reached 121,000 kilometers. With such a high-speed growth, the service environment of rails will inevitably become more complicated. Among them, the winter in most parts of my country is cold and long, and the winter temperature in some areas is sometimes lower than -40 ℃. The rails may be brittle and broken if they serve in low temperature environment for a long time, which directly affects the safety of railway transportation. This requires research and attempts to improve t...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/24B23P15/20C21D8/00C21D9/04
CPCB23P15/20C21D8/005C21D9/04C22C38/005C22C38/02C22C38/04C22C38/24
Inventor 薛虎东
Owner BAOTOU IRON & STEEL GRP
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