Oxide film and corrosion-resistant steel rail and its preparation method
A corrosion-resistant and oxide-film technology, applied in rails, rails, manufacturing tools, etc., can solve the problems of high production cost and low efficiency of corrosion-resistant rails, and achieve the effects of easy control of rail component content, pollution reduction, and time saving.
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[0022] The present invention also provides a method for preparing a corrosion-resistant steel rail. The method includes the following steps: heating the steel billet containing the above-mentioned rail matrix components until the steel billet is easily deformed, descaling with high-pressure water until the surface scale area of the steel billet is less than 10%, and placing the steel billet in an open The billet machine is rolled into shape, and the steel rail is made into rough rolling, intermediate rolling and finishing rolling by the universal rolling mill. The intermediate rolling and rough rolling are rolled at low temperature and large reduction, and compressed air is used to accelerate cooling from the temperature of the austenite zone of the rail. , cooled to below 570°C, then naturally cooled to room temperature, and straightened with a small amount of deformation.
[0023] Wherein, in the preparation method of the above-mentioned corrosion-resistant steel rail, the ...
Embodiment 1
[0034] The chemical composition of the rail matrix in this embodiment consists of the following elements by weight percentage: C 0.80%, Si 0.75%, Mn 0.95%, Cr 0.50%, V 0.07%, and the balance is Fe and other unavoidable impurities.
[0035] In this embodiment, the chemical composition of the billet and the rail matrix is consistent.
[0036] The steel billet is heated to 1170°C in a heating furnace, kept for 3 hours, descaled to 95% by high-pressure water, placed in billet rolling for forming, rough rolled in a universal rolling mill, and then placed in a universal rolling mill at a temperature of 880°C , the relative reduction is 22%, and then rolled by a universal finishing mill, the rolling temperature is 850°C, and the relative reduction is 14.5%. After universal finish rolling, use compressed air to descale again until the oxide scale is completely removed. The descaling point is located within 6m from the entrance of the heat treatment unit, and the descaling pressure i...
Embodiment 2
[0039] The chemical composition of the rail matrix in this embodiment consists of the following elements by weight percentage: C 0.70%, Si 0.15%, Mn 0.75%, Cr 0.30%, V 0.10%, and the balance is Fe and other unavoidable impurities.
[0040] In this embodiment, the chemical composition of the billet and the rail matrix is consistent.
[0041] The steel billet is heated to 1150°C in a heating furnace, kept for 2.5 hours, descaled to 96% by high-pressure water, placed in billet rolling for forming, rough rolled in a universal rolling mill, and then placed in a universal rolling mill at a temperature of 850°C , the relative reduction is 19%, and then rolled by a universal finishing mill, the rolling temperature is 820°C, and the relative reduction is 16%. After universal finish rolling, use compressed air to descale again until the oxide scale is completely removed. The descaling point is located within 6m from the entrance of the heat treatment unit, and the descaling pressure i...
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Abstract
Description
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