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Method for increasing contents of carbon, silicon and manganese in medium and high carbon liquid steel through molten iron

A medium-high carbon and molten steel carbon technology, applied in the field of smelting technology, can solve the problems of molten steel temperature loss, increase of deoxidized products, high alloying cost, etc., and achieve the effect of reducing alloying cost, controlling the consumption of steel materials, and saving alloy resources

Inactive Publication Date: 2018-03-13
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All kinds of raw materials added in the alloying process cause the temperature loss of molten steel after tapping, increase the deoxidation products in molten steel, and the cost of alloying is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 1. Prepare a can of molten iron, the temperature of the molten iron is 1360°C, the content of C in the molten iron is 4.5%, Si 0.50%, Mn 0.20%, P0.065%, S 0.040%.

[0016] 2. Carry out the slag removal operation on the selected molten iron, and the liquid level of the molten iron is exposed to more than 90%.

[0017] 3. The waiting time from molten iron after slag removal to turning over is 18 minutes

[0018] 4. Select U75V steel grade, and the finished steel grade has C 0.78%, P 0.025%, and S 0.020%. Smelting steel C 0.48%, P 0.016%, S 0.015%.

[0019] 5. The alloy added in the alloying of U75V steel increases carbon by 0.025-0.03%, and the difference between the amount of silicon and manganese added by the alloy and the target upper limit of the steel type is 0.05-0.10%.

[0020] 6. After the converter is tapped, lift the selected molten iron to the top of the molten steel tank and fold 5 tons of molten iron into it.

[0021] 7. Control the tapping temperature at ...

Embodiment 2

[0024] 1. Prepare a can of molten iron, the temperature of the molten iron is 1390°C, and the molten iron contains 4.0% C, 0.80% Si, 0.10% Mn, 0.055% P, and 0.029% S.

[0025] 2. Carry out the slag removal operation on the selected molten iron, and the liquid level of the molten iron is exposed to more than 90%.

[0026] 3. Wait for 10 minutes from molten iron after slag removal to turning over

[0027] 4. Select 80 steel grades, and the finished steel grades are C 0.85%, P 0.025%, and S 0.025%. Smelting steel C 0.35%, P0.018%, S 0.015%.

[0028] 5. The alloy added in the alloying of 80 steel increases carbon by 0.015-0.025%, and the difference between the amount of silicon and manganese increased by the alloy and the target upper limit of the steel type is 0.10-0.20%.

[0029] 6. After the converter is tapped, lift the selected molten iron to the top of the molten steel tank and fold 10 tons of molten iron into it.

[0030] 7. Control the tapping temperature at 1655°C and ...

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Abstract

The invention provides a method for increasing contents of carbon, silicon and manganese in medium and high carbon liquid steel through molten iron. The molten iron with the temperature being higher than 1350 DEG C is selected; the molten iron is composed of 4.0%-4.5% of C, 0.30-1.0% of Si, less than 0.30% of Mn, less than or equal to 0.070% of P and less than or equal to 0.070% of S; deslagging operation is conducted before application of the molten iron, surface residuals are removed, the molten iron level is exposed to 90% or above, and the waiting time of the molten iron after deslagging to iron turning is no longer than 20 min; medium and high carbon steel ball of which a finished product comprises greater than 0.30% of C, less than 0.025% of P and greater than 0.010% of S is selected, and the difference value between the tapping steel content of the medium and high carbon steel and the target upper limit of the steel ball is controlled to be within 0.35%; after converter tappingis completed, no more than 10 tons of the molten iron is added into ladles; and the melt of the molten iron is added into the ladles, the converter tapping temperature and the ladle hanging temperature are increased by 5-10 DEG C on the basis of process parameter requirements. Steel and iron consumption in the steelmaking process can be effectively controlled, and steel alloying cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of smelting technology, and in particular relates to a method for increasing the content of carbon, silicon and manganese in medium and high carbon steel molten steel by using molten iron. Background technique [0002] The alloying and carbon matching process of molten steel in converter smelting is generally carried out with various carburizers and various alloys containing corresponding metal elements. All kinds of raw materials added in the alloying process cause the temperature loss of molten steel after tapping, increase the deoxidation products in molten steel, and the cost of alloying is relatively high. Contents of the invention [0003] The invention provides a method for increasing the content of carbon, silicon and manganese in medium and high carbon steel by using molten iron, and aims at reducing the loss of steel materials in the steelmaking process and reducing the alloying cost of steel typ...

Claims

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Application Information

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IPC IPC(8): C22C33/04
CPCC22C33/04
Inventor 徐延浩王宏明高学忠常丽芬
Owner ANGANG STEEL CO LTD
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