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Corrosion-resistant high-strength pearlite steel rail and preparation method thereof

A pearlite rail, high-strength technology, applied in the field of metallurgy, can solve problems that do not involve the corrosion resistance of rails, and achieve the effect of improving service performance and service life

Active Publication Date: 2020-09-01
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

[0018] However, the above-mentioned application only improves the strength and hardness of the steel rail through the heat treatment process, and does not involve the corrosion resistance of the steel rail.

Method used

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  • Corrosion-resistant high-strength pearlite steel rail and preparation method thereof
  • Corrosion-resistant high-strength pearlite steel rail and preparation method thereof
  • Corrosion-resistant high-strength pearlite steel rail and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] Example 1: Hot metal desulfurization adopts magnesium powder desulfurization process, converter smelting adopts top-bottom combined blowing process, and controls the tapping temperature at 1670°C; the slag alkalinity of LF refining outside the furnace is controlled at 1.7, and the vacuum treatment time is 28 minutes; RH adopts Deep vacuum treatment, the treatment time of pressure ≤ 50Pa is 17min; the continuous casting process adopts the long nozzle of the large tank and the submerged nozzle of the crystallizer to protect the pouring, prevent contact with air, the immersion depth is 70mm, and the temperature of the tundish is controlled at 16℃ above the liquidus line , the billet casting speed is controlled at 0.4m / min, and the cast billet should be slowly cooled, the cooling rate is controlled at 0.1°C / s, and water spraying on the billet surface is strictly prohibited; the billet is heated by a walking beam heating furnace, and Carry out heat preservation treatment, the...

Embodiment 2

[0086] Example 2: Hot metal desulfurization adopts magnesium powder desulfurization process, converter smelting adopts top-bottom combined blowing process, and controls the tapping temperature at 1680°C; the slag alkalinity of LF refined outside the furnace is controlled at 1.8, and the vacuum treatment time is 30 minutes; RH adopts Deep vacuum treatment, the treatment time is 20 minutes when the pressure is less than or equal to 50Pa; the continuous casting process adopts the long nozzle of the large tank and the submerged nozzle of the crystallizer to protect the pouring, prevent contact with air, the immersion depth is 75mm, and the temperature of the tundish is controlled at 20°C above the liquidus line , the billet casting speed is controlled at 0.5m / min, and the cast billet should be slowly cooled, the cooling rate is controlled at 0.3°C / s, and it is strictly forbidden to spray water on the billet surface; the billet is heated by a walking beam heating furnace, and Carry ...

Embodiment 3

[0087] Example 3: Hot metal desulfurization adopts magnesium powder desulfurization process, converter smelting adopts top-bottom combined blowing process, and controls the tapping temperature at 1685°C; the slag alkalinity of LF refined outside the furnace is controlled at 2.1, and the vacuum treatment time is 32 minutes; RH adopts Deep vacuum treatment, the treatment time of pressure ≤ 50Pa is 18min; the continuous casting process adopts the long nozzle of the large tank and the immersed nozzle of the crystallizer to protect the pouring, prevent contact with air, the immersion depth is 72mm, and the temperature of the tundish is controlled at 18℃ above the liquidus line , the billet casting speed is controlled at 0.6m / min, and the cast billet should be slowly cooled at a rate of 0.2°C / s, and it is strictly forbidden to spray water on the billet surface; Carry out heat preservation treatment, the heating temperature is 1230°C, the heat preservation time is 200min, the rolling ...

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Abstract

The invention discloses a corrosion-resistant high-strength pearlite steel rail and a preparation method thereof, and belongs to the technical field of metallurgy. The steel rail comprises the following chemical components of, in percentage by mass, 0.65%-0.80% of C, 0.45%-0.85% of Si, 1.0%-1.5% of Mn, less than or equal to 0.020% of P, less than or equal to 0.020% of S, 0.68%-0.95% of Cr, 0.03%-0.06% of Nb, 0.8%-1.6% of Cu, 0.002%-0.006% of B, the balance Fe and unavoidable impurities. The steel rail is prepared through the processes of molten iron pretreatment, converter smelting, refining,vacuum treatment, continuous casting, rolling, online heat treatment and the like. According to the the steel rail designed by the preparation method, the room-temperature structure is fine lamellar pearlite and a small amount of ferrite, the lamellar spacing of the pearlite is 90-120nm, the tensile strength Rm is 1280-1350 MPa, the elongation A is 11%-13%, the tread hardness is 360-390 HB, and the room-temperature impact energy AKU is greater than 20 J.

Description

technical field [0001] The invention relates to a steel rail and a preparation method thereof, belonging to the technical field of metallurgy, in particular to a corrosion-resistant high-strength pearlitic steel rail and a preparation method thereof. Background technique [0002] The different environments of the rails lead to complex corrosion environments, which put forward extremely high requirements for the corrosion resistance of the rail materials. At the same time, the rail is mainly used to carry the weight of the train and guide the direction. It has strict requirements on its mechanical properties such as strength, hardness, and toughness. In addition, due to the need for seamless line construction, the rail is required to have good welding performance. At present, the rail products generally use medium-high Carbon design, resulting in very prone to corrosion, greatly reducing rail life. Due to corrosion, the thickness of the rail waist is rapidly thinned, which g...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/20C22C38/26C22C38/32C22C33/04C21D9/04C21D8/00C21C7/10C21C5/35C21C1/02
CPCC22C38/02C22C38/04C22C38/002C22C38/26C22C38/20C22C38/32C22C33/04C21C1/025C21C5/35C21C7/10C21D8/005C21D9/04C21D2211/009C21D2211/005
Inventor 费俊杰朱敏叶佳林周剑华叶途明王俊郑建国王瑞敏
Owner 武汉钢铁有限公司
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