Oxide film, corrosion-resistant rail and rail preparation method
A corrosion-resistant and oxide film technology, which is applied in the field of corrosion-resistant steel rails and the preparation and oxidation film of the corrosion-resistant steel rails, can solve the problems of high cost and low efficiency in the preparation of corrosion-resistant steel rails, and achieve easy control of the content of steel rail components and reduce pollution , the effect of saving time
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[0024] The present invention also provides a method for preparing a corrosion-resistant steel rail. The method includes the following steps: heating the steel slab containing the above-mentioned rail matrix components in an oxidative atmosphere until the oxide scale on the surface of the rail is easy to fall off; Rolling 5 to 7 passes in the billet mill. The first and third passes of the billet mill are rolled with a large reduction, and then enter the universal rolling mill. After rough rolling, intermediate rolling and finish rolling in the universal rolling mill After cooling, the finished rails are made through straightening and flaw detection.
[0025] Wherein, in the preparation method of the above-mentioned corrosion-resistant steel rail, the billet is prepared from molten iron in a blast furnace through converter smelting, LF refining, electric heating and continuous casting; the scale is iron oxide scale on the surface of the billet.
[0026] Wherein, in the preparati...
Embodiment 1
[0037] The chemical composition of the rail matrix in this embodiment consists of the following elements by weight percentage: C 0.72%, Si 0.32%, Mn 1.08%, and the balance is Fe and other unavoidable impurities.
[0038] In this embodiment, the chemical composition of the billet and the rail matrix is consistent.
[0039] Put the steel billet in the heating furnace to heat, control the ratio of air gas to 1:0.91~1:0.86, heat to 1210°C, keep warm for 2 hours, and descale the steel billet with high-pressure water, the descaling pressure is 19.5MPa, the steel billet after descaling The area of residual iron oxide scale on the upper surface and both sides is less than 10%. The billet is rolled 6 times by the billet mill, the relative reduction of the first pass is 30%, the relative reduction of the third pass is 26%, and the relative reduction of the second, fourth, fifth and sixth passes is The amount is 23%, 25%, 25% and 28%, respectively, and the residual area of scale i...
Embodiment 2
[0042] The chemical composition of the rail matrix in this embodiment consists of the following elements by weight: C 0.63%, Si 0.26%, Mn 0.90%, and the balance is Fe and other unavoidable impurities.
[0043] In this embodiment, the chemical composition of the billet and the rail matrix is consistent.
[0044] Put the steel billet in the heating furnace to heat, control the ratio of air and gas at 1:0.96~1:0.90, heat to 1160°C, keep warm for 2.5 hours, and descale the steel billet with high pressure water, the descaling pressure is 19.5MPa, after descaling The area of residual oxide scale on the upper surface and both sides of the billet is less than 10%. The billet is rolled 6 times by the billet mill, the relative reduction of the first pass is 35%, the relative reduction of the third pass is 24%, and the relative reduction of the second, fourth, fifth and sixth passes is The amount is 24%, 26%, 25% and 28% respectively, and the residual area of scale is less than 2%...
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Abstract
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