Desulfurization method of medium and low grade cold rolling non-oriented molten silicon steel
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A technology of oriented silicon steel and low grade, which is applied in the field of desulfurization of cold rolled non-oriented silicon steel of medium and low grades. The effect of improving, improving quality and improving service life
Active Publication Date: 2011-04-06
SHANXI TAIGANG STAINLESS STEEL CO LTD
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[0021] (2), RH desulfurization, resulting in a significant decrease in the life of the RH insertion tube
[0022] (3) The S of
Method used
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Example Embodiment
[0049] Embodiment one
[0050] What this embodiment deals with is the molten steel of medium grade 50TW470 cold-rolled non-oriented silicon steel. The ladle capacity is 80 tons.
[0051] The weight percentage of the composition of the middle grade 50TW470 cold-rolled non-oriented silicon steel is:
[0052] C≤0.004%; Si 1.50-1.70%; Mn 0.20-0.40%; P≤0.030%; S≤0.005%; Al 0.20-0.40%; the rest is Fe and unavoidable impurities.
[0053] I Deoxidation after tapping from converter
[0054] Pour 82 tons of pretreated molten iron with S content of S=0.0024% by weight and 8 tons of steel scrap into the converter. =0.046%, the temperature is 1690°C, and the weight percentage of the composition of the molten steel reaches the following values:
[0055] C 0.046%; Si 0.01%; Mn 0.02%; P 0.007%; S 0.0065%; the rest is Fe and unavoidable impurities.
[0056] Add 200kg of lime, 100kg of pre-melted slag, and 300kg of aluminum and iron to the ladle during tapping; add 300kg of lime, 200kg of ...
Example Embodiment
[0072] Embodiment two
[0073] What this embodiment deals with is low-grade 50TW600 cold-rolled non-oriented silicon steel molten steel, with a ladle capacity of 80 tons.
[0074] The composition percentage of low-grade 50TW600 cold-rolled non-oriented silicon steel is:
[0075] C≤0.005%; Si 1.25-1.50%; Mn 0.2-0.4%; P≤0.020; S≤0.005%; Al 0.20-0.32%; the rest is Fe and unavoidable impurities.
[0076] This embodiment is the following sequential steps:
[0077] I Deoxidation after tapping from converter
[0078] Pour 82 tons of pretreated molten iron with S content of S = 0.0022% in the molten iron into the converter. %, the temperature is 1680-1700°C, and the weight percentage of the composition of molten steel reaches the following values:
[0079] C 0.03%; Si 0.01%; Mn 0.03%; P 0.011%; S 0.0052%; the rest is Fe and unavoidable impurities.
[0080] Add 200kg of lime, 100kg of pre-melted slag, and 300kg of aluminum and iron into the ladle during tapping; add 300kg of lime,...
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Abstract
The invention relates to a desulfurization method of medium and low grade cold rolling non-oriented molten silicon steel, which comprises the following steps of: (1) deoxidizing after tapping of a rotary furnace, pouring pretreated hot metal into the rotary furnace, smelting, tapping, adding lime, premelted slag and aluminum iron during the tapping process, adding lime, premelted slag and aluminum pills into steel ladles after tapping, blowing argon gas and deoxidizing while strongly agitating; (2) low-frequency desulfurizing at low frequency station, sampling, analyzing that carbon in molten steel is not greater than 0.05%, delivering power, blowing argon gas from bottom, agitating, cutting off power, blowing argon gas while strongly agitating, sampling and analyzing; and (3) relative-humidity decarburizing at relative humidity station, vacuumizing, sampling and analyzing carbon content and aluminum content in molten aluminum, wherein the blowing oxygen content is O<2>(Nm<3>)=molten steel quantity (ton)*0.4+{[C]%+[Al]}*10<3>; circulating in vacuum, sampling after adding aluminum when the carbon content [C] in molten steel is not greater than 0.0020%, and IVRH alloying when the C content in molten steel is not greater than 0.0025%. Sulfur in the medium and low grade cold rolling non-oriented molten silicon steel can be reduced to below 20 ppm.
Description
technical field [0001] The invention relates to a desulfurization method in the smelting process of low- and medium-grade cold-rolled non-oriented silicon steel. Background technique [0002] Cold-rolled non-oriented silicon steel requires S≤0.0050% in the finished product. Sulfur content is reduced, and the iron loss is significantly reduced. The reduction in iron loss can not only save a lot of electric energy, but also prolong the working time of motors and transformers, and simplify the cooling device. The annual electricity loss caused by the iron loss of electrical steel plates in various countries accounts for about half of the total. The annual power generation is 2.5-4.5%, so the iron loss value is the most important index to evaluate the magnetic properties of cold-rolled non-oriented silicon steel products, and it is also used as a basis to classify the products. [0003] The general smelting process of cold-rolled non-oriented silicon steel is: [0004] Hot met...
Claims
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