Method for smelting non-oriented silicon steel by using molten iron containing vanadium and titanium

A technology of oriented silicon steel and molten iron, applied in the field of metallurgy, can solve the problems of large fluctuation of sulfur content, increase in sulfur, insufficient heat, etc., and achieve the effect of improving the purity of molten steel, high pourability of molten steel, and high purity of molten steel

Active Publication Date: 2015-10-21
HEBEI IRON AND STEEL
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Problems solved by technology

[0002] At present, iron and steel enterprises that use vanadium-titanium magnetite as the main raw material for production, because the content of vanadium in the molten iron they produce is between 0.100% and 0.500%, based on the characteristics of the vanadium-titanium molten iron, the sulfur content in the molten iron fluctuates greatly Moreover, it is unstable, which makes it difficult to desulfurize the vanadium-containing molten iron. The sulfur content in the molten steel exceeds the requirements of non-oriented silicon steel. The high sulfur content of the produced non-oriented silicon steel will increase the iron loss and affect the use of customers.
If the molten iron converter vanadium extraction and desulfurization process is adopted, the molten iron consumes a large amount of heat to extract vanadium in the converter, and there is a problem of insufficient heat in the desulfurization steelmaking converter, and the sulfur content at the end of the smelting cannot be controlled below 0.003%. % or less, there will be a phenomenon of sulfur increase in the process of adding ferrosilicon to the RH furnace, and the sulfur element in the ferrosilicon used due to the large amount of silicon supplementation will increase the sulfur content of molten steel to more than 0.008%, seriously deteriorating the performance of the coil , resulting in increased iron loss

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] For smelting CGW800A non-oriented silicon steel, the chemical composition weight percentage requirements are as follows: C≤0.006%, Si: 0.70~0.90%, Mn: 0.15~0.25%, P≤0.040%, S≤0.008%, V≤0.006%, Cr≤0.10 %, Cu≤0.20%, Ni≤0.15%, Ti≤0.003%, B≤0.0005%, Nb≤0.005%, N≤0.0040%.

[0028] (1) Converter vanadium extraction: Select vanadium-containing molten iron with a sulfur content of ≤0.030wt%, add vanadium to the low-sulfur coolant Australian ore, ensure that the temperature of the semi-steel is at 1330°C, and add 1 ton of vanadium to the semi-steel ladle before the semi-steel is discharged Calcium-based desulfurizer to obtain C: 4.30%, V: 0.050% vanadium-containing semi-steel; when tapping the vanadium-extracting converter, add heat-supplementing agent silicon-manganese alloy 400kg / furnace to the semi-steel;

[0029] (2) Desulfurization: The steel-making semi-steel is desulfurized, the injection time is 6 minutes, the amount of granular magnesium is 50Kg, and the steel-making se...

Embodiment 2

[0035] For smelting CGW800A non-oriented silicon steel, the weight percentage requirements of the chemical composition of the slab are as follows: C≤0.006%, Si: 0.70-0.90%, Mn: 0.15-0.25%, P≤0.040%, S≤0.008%, V≤0.006%, Cr≤0.10%, Cu≤0.20%, Ni≤0.15%, Ti≤0.003%, B≤0.0005%, Nb≤0.005%, N≤0.0040%.

[0036] (1) Converter vanadium extraction: Select vanadium-containing molten iron with a sulfur content of ≤0.030wt%, add vanadium to the low-sulfur coolant Australian ore, ensure that the temperature of the semi-steel is at 1337°C, and add 1.5 tons of iron to the semi-steel ladle before the semi-steel is discharged Calcium-based desulfurizer to obtain C: 4.35%, V: 0.042% vanadium-containing semi-steel; when tapping the vanadium-extracting converter, add heat supplement 400kg / furnace of silicon-manganese alloy to the semi-steel;

[0037] (2) Desulfurization: The steel-making semi-steel is desulfurized, the injection time is 15 minutes, the amount of granular magnesium is 100Kg, and the st...

Embodiment 3

[0043] For smelting CGW800A non-oriented silicon steel, the weight percentage requirements of the chemical composition of the slab are as follows: C≤0.006%, Si: 0.70-0.90%, Mn: 0.15-0.25%, P≤0.040%, S≤0.008%, V≤0.006%, Cr≤0.10%, Cu≤0.20%, Ni≤0.15%, Ti≤0.003%, B≤0.0005%, Nb≤0.005%, N≤0.0040%.

[0044] (1) Converter vanadium extraction: Select vanadium-containing molten iron with a sulfur content of ≤0.030wt%, add vanadium to the low-sulfur coolant Australian ore, and ensure that the temperature of the semi-steel is at 1344°C, and add 1.0 tons of semi-steel to the semi-steel ladle Calcium-based desulfurizer to obtain C: 4.22%, V: 0.053% vanadium-containing semi-steel; when tapping the vanadium-extracting converter, add heat-supplementing agent silicon-manganese alloy 400kg / furnace to the semi-steel;

[0045] (2) Desulfurization: The steel-making semi-steel is subjected to desulfurization treatment, the injection time is 20 minutes, the amount of granular magnesium is 200Kg, and ...

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Abstract

The invention relates to a method for smelting non-oriented silicon steel by using molten iron containing vanadium and titanium, and belongs to the technical field of metallurgy. The method comprises the steps of converter vanadium extraction of the molten iron containing vanadium and titanium, desulphurization, converter steelmaking, RH refining and slab continuous casting in order to obtain the non-oriented silicon steel. The method fully overcomes the disadvantages of poor top slag fluidity, poor desulphurization effect and many residual elements of the molten iron containing vanadium and titanium, reduces entrance of vanadium, titanium and other residual elements to the molten steel, and improves the purity of the molten steel; and the method adopting a double station RH refinery and continuous caster matching production mode guarantees the smelting cycle in a range of 35-40min. The technology has the characteristics of high purity of the molten steel, high castability of the molten steel, and short production cycle.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for smelting non-oriented silicon steel by using molten iron containing vanadium and titanium. Background technique [0002] At present, iron and steel enterprises that use vanadium-titanium magnetite as the main raw material for production, because the content of vanadium in the molten iron they produce is between 0.100% and 0.500%, based on the characteristics of the vanadium-titanium molten iron, the sulfur content in the molten iron fluctuates greatly Moreover, it is unstable, which makes it difficult to desulfurize the vanadium-containing molten iron. The sulfur content in the molten steel exceeds the requirements of non-oriented silicon steel. The high sulfur content of the produced non-oriented silicon steel will increase the iron loss and affect the use of customers. If the molten iron converter vanadium extraction and desulfurization process is ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/54C21C5/28C21C5/34C21C7/10
Inventor 方鸣张兴利高海高建国韩宇田鹏
Owner HEBEI IRON AND STEEL
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