Method for reducing oxygen content of molten steel smelted in acidic electric arc furnace through controlling static boiling time
An electric arc furnace and oxygen content technology is applied in the field of acid electric arc furnace smelting to control the static boiling time and reduce the oxygen content of molten steel, which can solve the problems of increasing oxide inclusions, deteriorating the quality of molten steel, and reducing mechanical properties of steel.
Inactive Publication Date: 2015-11-25
ZHENJIANG YINUOWEI SHAPE MEMORY ALLOYS
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The increase of oxidized inclusions deteriorates the quality of molten steel and ultimately reduces the mechanical properties of steel
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[0014] ZG31Mn2Si steel is smelted in a 5T acid electric arc furnace. The composition control range is: C0.26-0.36wt%, Si0.5-0.9wt%, Mn1.1-1.6wt%, S, P≤0.05wt%.
[0015] The main process points are as follows.
[0016] Charging, melting, slagging should be made in time according to the melting situation at the end of melting, after melting: C0.3-0.45wt%, S, P≤0.04wt%; in the oxidation period, add 0.5wt% of iron ore with charge for oxidative decarburization When the carbon is reduced to 0.15-0.20wt%, part of the steel slag is flowed out, and 0.3wt% limestone of the charge is added for static boiling. The static boiling time (static boiling time is 3min, 4min, 6min, 8min, 10min, 12min, 13min) Smelting operation), the sign that the static boiling is done: the slag-like surface is brown; the temperature of the molten steel is 1620-1640 ℃; after the molten steel is fully statically boiling, add 0.3wt% limestone of the charge and 0.1wt% ferrosilicon powder of the charge for 5 minutes , F...
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The invention discloses a method for reducing the oxygen content of molten steel smelted in an acidic electric arc furnace through controlling the static boiling time, and belongs to the technical field of steel smelting. The method is characterized by controlling the static boiling time. The method comprises the following steps: filling raw materials, smelting, carrying out decarbonization; when the carbon content is reduced to 0.15 to 0.20%, discharging part of steel slag, adding a proper amount of limestone to carry out static boiling, wherein the static boiling is performed at time intervals: 3 minutes, 4 minutes, 6 minutes, 8 minutes, 10 minutes, 12 minutes, and 13 minutes, and when the slag surface turns brown, the static boiling is finished; after the sufficient static boiling of molten steel, adding a proper amount of limestone / dry quartz sand and a proper amount of silicone-iron powder, maintaining for 5 minutes to carry out reduction; when the temperature reaches 1660 to 1680 DEG C, adding manganese-iron, discharging the molten steel at a temperature of 1710 to 1730; and adding aluminum into the steel discharging tank during the process of steel discharging, wherein 1 kilogram of aluminum is added for each ton of steel. Before casting, a rare earth alterant is added into the casting small ladle.
Description
technical field [0001] The invention belongs to the technical field of iron and steel smelting, in particular to a method for controlling the static boiling time and reducing the oxygen content of molten steel in acid electric arc furnace smelting. Background technique [0002] Steelmaking is an important link in the production of steel castings. The quality of steel castings has a lot to do with molten steel. The mechanical properties of cast steel are largely determined by the chemical composition of molten steel. And many kinds of casting defects, such as: molten steel oxygen content, pores, hot cracks, etc. also have a great relationship with the quality of molten steel. Therefore, in order to ensure the quality of castings, high-quality molten steel must be smelted. As the oxygen content in the molten steel increases, the gas and oxidized inclusions in the molten steel increase. Such oxidized inclusions can be formed during ladle metallurgy or during pouring; in addi...
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Login to View More IPC IPC(8): C21C5/52C21C7/068B22D1/00
CPCY02P10/20
Inventor 杨嵩胡建军李晓薇张志敏
Owner ZHENJIANG YINUOWEI SHAPE MEMORY ALLOYS