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A method for producing ultra-low manganese steel by utilizing high manganese molten iron converter
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A technology for ultra-low manganese steel and molten iron, which is applied in the field of iron and steel metallurgy to achieve the effects of good stability, easy understanding and control, and high smelting rate.
Active Publication Date: 2021-11-30
BAOTOU IRON & STEEL GRP
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[0007] In order to overcome the deficiency that the existing converter production process cannot use high-manganese molten iron with a manganese content higher than 0.40% to smelt ultra-low manganese steel, the present invention provides a method for producing ultra-low manganese steel using a high-manganese molten iron converter. Developed the "two controls and one increase" deep demanganization operation process of converter, which can smelt molten steel with manganese content less than 0.03% by using high manganese molten iron as raw material without adding other auxiliary equipment and raw materials
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Embodiment 1
[0036] Using molten iron with a manganese content of 0.406% as the raw material, it is smelted using the "two controls and one increase" smelting process of the converter. The TSC temperature of the converter is 1566.8°C, the carbon content of the TSC sample is 0.315%, the manganese content is 0.096%, and the amount of lime ash added after TSC is 1181kg , calcined dolomite 1177kg, iron ball 9894kg, dolomite 316kg, converter end point temperature is 1607°C, oxygen content is 1089ppm, end point manganese content is 0.028%,
Embodiment 2
[0038] Using molten iron with a manganese content of 0.411% as raw material, it is smelted using the "two controls and one increase" smelting process of the converter. The TSC temperature of the converter is 1563.0°C. The carbon content of the TSC sample is 0.395%, and the manganese content is 0.082%. The amount of feed after TSC is calcined Baiyun Stone 2675kg, iron ball 8619kg, converter end point temperature is 1616°C, oxygen content is 1300ppm, end point manganese content is 0.019%,
Embodiment 3
[0040] Using molten iron with a manganese content of 0.434% as raw material, it is smelted using the "two controls and one increase" smelting process of the converter. The TSC temperature of the converter is 1559°C. The carbon content of the TSC sample is 0.469%, and the manganese content is 0.073%. The amount of feed after TSC is calcined Baiyun Stone 1925kg, iron ball 6530kg, dolomite 392kg, converter end point temperature 1607°C, oxygen content 1163ppm, end point manganese content 0.023%.
[0041] One key point of the present invention is that: after blowing the TSC in the later stage, the ratio of the total amount of non-metallic slagging materials (lime, calcined dolomite, dolomite) to the added amount of iron balls is greater than 1:1.5.
[0042] In the above three embodiments, the content of manganese in the furnace molten iron exceeds 0.40%, and the manganese content is lower than 0.03% after the demanganization of the converter, which reaches the smelting standard. It ...
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Abstract
The invention discloses a method for producing ultra-low manganese steel using a high-manganese molten iron converter, comprising: S1. Adjusting the smelting conditions of the converter, selecting a furnace with a high carbon-oxygen product for smelting, adjusting the bottom blowing control mode according to the carbon-oxygen product, Adjust the ratio of molten iron and steel scrap into the furnace to create conditions for slagging, and use a reasonable oxygen lance control mode; S2. Control the converter smelting process in stages. In the early stage of converter blowing, add the first batch of materials after the ignition is normal, and carefully observe Reactions in the furnace to prevent splashing; control the melting of slag and the temperature of the molten pool in the mid-stage of blowing, and use the sub-lance to measure the temperature and carbon content of the molten pool in the middle and late stages of blowing; replenish materials according to the measurement of TSC in the later stage of blowing Operation, control the end point temperature and oxygen content. The invention provides a method for producing ultra-low manganese steel using a high manganese molten iron converter, and develops a "two controls and one increase" deep demanganization operation process for the converter, which can use high manganese molten iron as raw material to smelt molten steel with a manganese content lower than 0.03%. .
Description
technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to a method for producing ultra-low manganese steel using a high manganese molten iron converter. Background technique [0002] Industrial pure iron is an important basic steel material, mainly used for smelting various high-temperature alloys, heat-resistant alloys, precision alloys, aerospace, military alloys, etc. Baotou Steel's current molten iron is in poor condition, with high manganese and phosphorus content and large fluctuations. The current production process can no longer meet the requirements of market customers for steel grades. Industrial pure iron is a special type of steel, and the mass fraction of elements contained in the steel is required to be as low as possible. Different from conventional special steel grades, only the manganese element is calculated in the percentile, while the other elements are calculated in the thousandth percentile in the current ...
Claims
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Application Information
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