Corrosion-resistant high-strength pearlitic steel rail and preparation method thereof
A pearlitic steel rail, high-strength technology, applied in the field of metallurgy, can solve problems such as corrosion resistance of steel rails that are not involved, and achieve the effect of improving service performance and service life
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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
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