Smelting method of steel for raw material pure iron
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The technology of raw material pure iron and smelting method is applied in the field of smelting raw material pure iron and steel, and can solve the problems of poor control level and excessive thickness of top slag.
Active Publication Date: 2012-10-10
SHANXI TAIGANG STAINLESS STEEL CO LTD
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The smelting method of the existing raw material pure iron steel adopts the process route of primary smelting furnace (converter or electric arc furnace) + vacuum furnace, and desulfurization and dephosphorization are mainly carried out in the...
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Embodiment 1
[0032] The operation of this embodiment is the following sequential steps:
[0033] Ⅰ The converter is smelted according to the composition of YT01, the tapping temperature of the converter is 1620°C, and the slag ball is used to block the slag during the tapping process. After tapping, the slag thickness on the top of the ladle is 40mm, the binary alkalinity of the slag is 3.5, and the weight of the molten steel is 81t .
[0034] The composition weight percentage of molten steel after converter tapping is:
[0035] C=0.026%, P=0.004%, S=0.0066%
[0036] The rest are unavoidable impurities of iron and iron.
[0037] Ⅱ Initial dephosphorization
[0038] Add 280kg of red mud balls (with a TFe content of 35% to 45%) into the ladle when the converter is tapping, connect to the bottom blowing argon, the flow rate of the bottom blowing argon is 500L / min, stir for 3 minutes, and hang it to the LF ladle refining furnace;
[0039] Ⅲ deep dephosphorization
[0040] Add 350kg of li...
Embodiment 2
[0054] Ⅰ The converter is smelted according to the composition of YT01. The tapping temperature of the converter is 1613°C. The slag ball is used to block the slag during the tapping process. After tapping, the slag thickness on the top of the ladle is 30mm, the binary alkalinity of the slag is 3.8, and the weight of the molten steel is 81t .
[0055] The composition weight percentage of molten steel after converter tapping is:
[0056] C=0.033%, P=0.005%, S=0.0063%
[0057] The rest are unavoidable impurities of iron and iron.
[0058] Ⅱ Initial dephosphorization
[0059] Add 320kg of red mud balls (with a TFe content of 35% to 45%) into the ladle when the converter is tapping, connect to the bottom blowing argon, the flow rate of the bottom blowing argon is 500L / min, stir for 3 minutes, and hang it to the LF ladle refining furnace;
[0060] Ⅲ Deep dephosphorization:
[0061] Add 350kg of lime during the LF refining process to make the slag alkalinity reach 4.7, adjust th...
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Abstract
The invention relates to a smelting method of steel for raw material pure iron, comprising the following steps of: I, tapping by a converter: tapping when P is less than or equal to 0.006%, S is less than or equal to 0.07% and C is 0.02-0.04% in liquid steel; and binary alkalinity of furnace slag is 3-4; II, primarily dephosphorizing: in the process of tapping by the converter, adding a liquid steel dephosphorizing agent into a steel ladle and powerfully agitating by argon; III, deeply dephosphorizing: adding lime after an LF (Low Frequency) furnace arrives, wherein the binary alkalinity of the furnace slag is 4-5; powerfully agitating by the argon and slagging off; adding the lime by the LF furnace and adjusting the slag by fluorite, wherein the alkalinity is 7-8; raising the temperature and adding aluminum powder to adjust the slag and powerfully agitating by the argon; IV, decarbonizing: conveying the steel ladle to an RH and arriving at the station and vacuumizing oxygen, wherein the vacuum degree is less than or equal to 4 mbar; and decarbonizing at the vacuum degree for 10-15 minutes; and V, desulfurizing: after decarbonizing, making the oxygen content after decarbonizing; adding aluminum according to a constant oxygen amount and adjusting; and adding a desulfurization agent, wherein the mass percentages of components in the liquid steel are as follows: the C is less than or equal to 0.002%, the S is less than or equal to 0.005%, the P is less than or equal to 0.002% and Al is less than or equal to 0.03%; and the others are Fe and unavoidable impurities. The smelting method of the steel for the raw material pure iron improves the purity of the liquid steel.
Description
technical field [0001] The invention relates to a method for smelting raw material pure iron steel. Background technique [0002] Ultra-low phosphorus, ultra-low sulfur and high-purity raw material pure iron is the basic material for the production of NdFeB magnetic materials, electrothermal alloys, precision alloys, low-carbon stainless steel, powder metallurgy, amorphous alloys and other special metal materials. [0003] Patent No. 02115419.8 discloses "a method for controlling phosphorus in the production of ultra-low phosphorus steel", which mainly produces killed steel, but does not elaborate on the dephosphorization of boiling steel. Due to the extremely low carbon content of high-purity raw material pure iron, undeoxidized tapping is used in the converter, and the thermodynamic conditions for dephosphorization and desulfurization are different. The smelting method of the existing raw material pure iron steel adopts the process route of primary smelting furnace (conve...
Claims
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