Control method of aluminum content of heavy rail steel
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A control method and aluminum content technology, applied in the manufacture of converters, etc., can solve problems such as unqualified steel composition, change steel types, and reduce product refining rates, so as to achieve the effect of reducing economic losses
Inactive Publication Date: 2013-01-09
ANGANG STEEL CO LTD
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Problems solved by technology
Since the alloy and slag added to the heavy rail steel can easily cause the aluminum content of the steel to exceed the standard, it is not only difficult to control aluminum
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Embodiment 1
[0020] Steel U71Mn, its chemical composition mass percentage is:
[0021] C 0.62-0.80%, Si 0.15-0.58%, Mn0.70-1.20%, P≤0.030%, S≤0.025%, Cr≤0.15%, V≤0.03%, Al≤0.004%.
[0022] 1. The process route adopted is: converter smelting - post-converter alloy adjustment - LF furnace alloy fine-tuning - VD furnace vacuum degassing - continuous casting.
[0023] 2. Add 300kg recarburizer during the tapping process of the converter, and control the carbon content of the tapping at 0.035wt%.
[0024] 3. After tapping, the temperature of the molten steel is controlled at 1585°C; the grade is FeMn68Si18 manganese-silicon alloy to adjust the manganese and silicon components; then add 350kg of deoxidizer to adjust the manganese content in the steel to 1.12 wt%. At this time, the silicon content is 0.31 wt%.
[0025] 4. After the ladle is transported to the LF furnace, the temperature of the molten steel entering the LF furnace is 1545°C, according to CaO / Al 2 o 3 =4 ratio to add active lim...
Embodiment 2
[0030] Steel U75V, its chemical composition mass percentage is:
[0031] C 0.71-0.80%, Si 0.50-0.70%, Mn0.75-1.05%, P≤0.030%, S≤0.025%, Cr≤0.15%, V0.04-0.12%, Al≤0.004%.
[0032] 1. The process route adopted is: converter smelting - post-converter alloy adjustment - LF furnace alloy fine-tuning - VD furnace vacuum degassing - continuous casting.
[0033] 2. Add 400kg of recarburizer during the tapping process of the converter, and control the carbon content of the tapping at 0.022wt%.
[0034] 3. After tapping, the temperature of the molten steel is controlled at 1600°C; the grade is FeMn67Si23 manganese-silicon alloy to adjust the manganese and silicon components; then add 200kg of deoxidizer to adjust the manganese content in the steel to 0.88 wt%, at this time the silicon content is 0.33 wt%.
[0035] 4. After the ladle is transported to the LF furnace, the temperature of the molten steel entering the LF furnace is 1552 ° C, according to CaO / Al 2 o 3 =5 ratio to add act...
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Abstract
The invention provides a control method of aluminum content of heavy rail steel. Carbon content of tapping steel of a converter is controlled, and an carburetant is added in a tapping process; manganese and silicon ingredient adjustment is carried out by using manganese-silicon alloy, and deoxidier-2-3.5kg/ton of steel is added; active lime and bauxite are added in an LF (ladle furnace), an iron sheet ball is added in slag after top slag is completely melted; manganese alloy content fine tuning is carried out by using the manganese-silicon alloy, and the carbon content is adjusted to be 0.68-0.75wt%; and temperature is raised to 1570-1585 DEG C, a liquid steel tank is moved into a vacuum degassing (VD) furnace from the LF to conduct vacuum treatment, pouring is carried out on a continuous casting machine, and a tundish water feeding port is closed to conduct argon blowing in a pouring process. With the adoption of the control method, adding quantity of high price alloy can be substantially reduced, the aluminum content in steel in the LF is prevented from increasing and mass production is achieved under a condition that the aluminum content in the steel is lower than 0.004%; and average aluminum content can achieve lower than 0.0026%, and a melting rate of the heavy rail steel is 0.033%.
Description
technical field [0001] The invention belongs to the technical field of smelting technology, in particular to a method for controlling aluminum content in the production process of heavy rail steel. Background technique [0002] Heavy rail steel has higher requirements on aluminum content. In the industry standard TBT3276-2011 "Steel Rails for High-speed Railways", the required aluminum content is less than 0.004%. Since the alloy and slag added to the heavy rail steel can easily cause the aluminum content of the steel to exceed the standard, it is not only difficult to control aluminum, but also easily leads to the problem of unqualified steel composition and changing the steel grade, thus greatly reducing the refining process of the product. success rate. Contents of the invention [0003] The invention aims to provide a method for controlling the aluminum content of heavy rail steel, so as to realize the smelting of heavy rail steel meeting the requirements of aluminum ...
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