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Smelting method for producing sulfur-containing steel from low-sulfur molten iron
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A smelting method and technology for low-sulfur molten iron, applied in the field of metallurgy, can solve the problems of immature sulfur content control technology, poor production quality and cost control, unfavorable control of molten steel purity, etc. The effect of maintaining low sulfur capacity and reducing sulfur loss
Active Publication Date: 2022-07-12
JIANGSU SHAGANG GROUP HUAIGANG SPECIAL STEEL CO LTD +1
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Problems solved by technology
[0002]
With the rapid development of my country's iron and steel smelting industry, many sulfur-containing special steels have been developed. However, the production technology for special sulfur-containing steels is still in the exploratory stage, especially the control technology of sulfur content in molten steel is not mature and stable enough. Poor quality and cost control
[0003]
For example, patent CN201510358287 discloses a method for controlling sulfur content in steel and patent CN201510158044 discloses a method for smelting sulfur-containing steel. High-sulfur molten iron is selected, and the sulfur-feeding line in the refining production process increases sulfur in molten steel, and VD removes slag to reduce Desulfurization, the process of this kind of production method is limited by molten iron, the refining process increases sulfur and removes slag, which affects the production operation and the purity of steel
Patent CN201510095647 discloses a series of gear steel smelting process containing aluminum and sulfur. The production process first desulfurizes and then increases the sulfur. The production cost increases. The sulfur increase in the later stage of refining is also not conducive to the control of the purity of molten steel.
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Embodiment 1
[0021] Using this method to smelt SAE1117, the mass percentage of chemical composition is: C 0.15%~0.22%, Si 0.15%~0.45%, Mn1.10%~1.55%, Cr ≤ 0.40%, Al ≤ 0.040%, P ≤ 0.020%, S 0.080%~0.130%, Ni≤0.20%, Cu≤0.20%, V≤0.20%, Ti≤0.030%, the rest is Fe. It specifically includes the following steps:
[0022] 1) The sulfur content of molten iron is 0.025% to 0.040%, smelted in the primary furnace, and the end of molten steel w ([S])=0.015%~0.035%. When the tapping volume is 10t~30t, according to the free oxygen content at the end of molten steel, add 1.1kg / t~1.7kg / t aluminum block for deoxidation; when the tapping volume is 20t~40t, add 2.0kg / t~4.0kg / t sulphur iron alloy kg / t, refined to the station w ([S])=0.100%~0.120%.
[0023] Before the end of tapping, add quartz sand → pre-melting refining slag → lime into the ladle in the order of 1:2:4, and the amount of quartz sand is 1.8kg / t ~ 2.0kg / t.
[0024] Composition of LF pit slag (mass percentage): w (CaO)=45%~50%, w (SiO 2 )=...
Embodiment 2
[0033] Using this method to smelt C38N2+BY, the chemical compositionmass percentages are: C 0.32%~0.42%, Si 0.40%~0.70%, Mn1.20%~1.70%, Cr 0.05%~0.25%, Al ≤0.025%, P≤ 0.025%, S 0.045%~0.070%, Ni≤0.20%, Cu≤0.20%, V 0.02%~0.10%, Ti 0.005%~0.035%, and the rest are Fe. It specifically includes the following steps:
[0034] 1) The sulfur content of molten iron is 0.020% to 0.035%, smelted in the primary furnace, and the end of molten steel w ([S])=0.015%~0.030%. When the tapping volume is 10t~30t, according to the free oxygen content at the end of molten steel, add 1.1kg / t~1.7kg / t aluminum block for deoxidation; when the tapping volume is 20t~40t, add 0.85kg / t~2.5kg / t sulphur iron alloy kg / t, refined to the station w ([S])=0.060%~0.075%;
[0035] Before the end of tapping, add quartz sand → pre-melting refining slag → lime into the ladle in the order of 1:2:4, and the amount of quartz sand is 1.2kg / t ~ 1.5kg / t.
[0036] Composition of LF pit slag (mass percentage): w (CaO)=4...
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Abstract
The invention discloses a smelting method for producing sulfur-containing steel from low-sulfur molten iron, which comprises the following steps of: performing aluminum deoxidation on molten steel in the tapping process of a primary smelting furnace (electric furnace / converter), adding alloys such as sulfur and iron for alloying, and adding quartz sand, pre-melted refining slag and lime to prepare low-alkalinityslag; and performing slag surface composite diffusion deoxidation operation in the LF refining process. The sulfur content of the molten steel is increased by adding ferroussulfide in the tapping process, the problem that the initial sulfur content of the molten steel is low due to the low sulfur content of the molten steel is solved, meanwhile, aluminum is adopted for strong deoxidation, low-alkalinity slag is made, and the desulfurization amount in the LF refining process is 1t; the stability of the sulfur content of the molten steel is ensured.
Description
technical field [0001] The invention belongs to the field of metallurgy, in particular to a smelting method for producing sulfur-containing steel from low-sulfur molten iron. Background technique [0002] With the rapid development of my country's iron and steel smelting industry, many special sulfur-containing steels have been developed. At present, the production process technology for sulfur-containing special steels is still in the exploratory stage, especially the control technology of sulfur content in molten steel is not mature and stable enough. Poor quality and cost control. [0003] For example, a method for controlling sulfur content in steel disclosed in patent CN201510358287 and a smelting method for sulfur-containing steel disclosed in patent CN201510158044, high-sulfur molten iron is selected, the sulfur feeding line in the refining production process increases the sulfur in the molten steel, and the VD is removed by slag removal. Desulfurization, the formulat...
Claims
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Application Information
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