Method for deoxidizing and alloying molten steel in converter steel ladle

A technology of alloying and alloying elements, which is applied in the field of deoxidation and alloying in ladles, can solve the problems of increasing steel consumption, steel cost, and converter overoxidation, so as to improve efficiency, improve cleanliness, and avoid alloy burning damage effect

Active Publication Date: 2014-02-05
WUHAN IRON & STEEL ENG TECH GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At the same time, the oxygen content in steel depends on many factors. Even if the same steel type is smelted, the alloys required are different due to the different actual oxygen content. As described in the period), some converters have overoxidation phenomenon, which increases steel consumption and steel cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Using silicon as a chemical element for deoxidation and alloying;

[0048] The final chemical composition of the steel to be smelted is: C: 0.12-0.18%, Si: 0.2-0.4%, Mn: ~1.0-1.6%, P: 0.04-009%, S≦0.015%;

[0049] Then the Q of Si 1 0.3%, using ferrosilicon as deoxidizer material, its silicon content is 50%;

[0050] According to the composition setting, the Q of Si 2 0.03%; Known W 钢水 is 120000 kg;

[0051] According to the measured weight percent content of oxygen in molten steel is 0.026%, using the chemical equation of the reaction between ferroalloy and oxygen in molten steel, calculate the amount of silicon w required for deoxidation 脱氧 0.0133%;

[0052] Alloying steps in ladle:

[0053] 1) Converter smelting and tapping;

[0054] 2) During the tapping process of molten steel, silicon is added for deoxidation and alloying;

[0055] According to the calculation method when an alloying element is added to the ladle for deoxidation and alloying: perform the ...

Embodiment 2

[0067] Manganese and silicon are used as elements for deoxidation and alloying

[0068] The final chemical composition of the steel to be smelted is: C: ~ 0.06 ~ 0.12%, Si: 0.35%, Mn: 0.25 ~ 0.50%, P: 0.04 ~ 009%, S≦0.015%; The content is 0.03%.

[0069] Then the Q of Si 1 0.35%, 50% ferrosilicon containing silicon and 75% ferromanganese containing manganese are used as deoxidizing materials;

[0070] According to the composition setting, the Q of Si 1 0.35%, Q 2 0.03%, the Q of Mn 1 0.38%, Q 2 0.15%;

[0071] Known W 钢水 120000kg;

[0072] Among silicon and manganese, the deoxidation constant of silicon is the smallest, so it is calculated according to the calculation method when adding an alloying element for deoxidation and alloying, respectively using W 1脱氧 and W 1合金化 express;

[0073] According to the measured weight percent content of oxygen in molten steel is 0.03%, using the chemical equation of the reaction between ferroalloy and oxygen in molten steel, calc...

Embodiment 3

[0094] Elements for deoxidation and alloying with aluminum, silicon, and manganese

[0095] The final chemical composition of the steel to be smelted is: C: 0.050% - 0.090%, Si: 0.15%, Mn: 1.00% - 1.50%, P <0.013%, S<0.003% Als: 0.04% - 0.05%

[0096] Then the Q of Si 1 0.15%, 50% ferrosilicon containing silicon and 75% ferromanganese containing manganese are used as deoxidizing materials; pure aluminum is used for aluminum.

[0097] According to the composition setting, the Q of Al 1 0.045%, Q 2 is 0; Q of Si 1 0.15%, Q 2 0.03%; the Q of Mn 1 1.25%, Q 2 0.15%;

[0098] Known W 钢水 120000kg;

[0099] Alloying steps in ladle:

[0100] 1) Converter smelting and tapping;

[0101] 2) During the tapping process of molten steel, deoxidation alloying elements aluminum, silicon and manganese are added for deoxidation alloying;

[0102] According to the calculation method when an alloying element is added to the ladle for deoxidation and alloying: perform the following calc...

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Abstract

The invention relates to a method for alloying in a steel ladle. The method comprises the following steps of: smelting in a converter and tapping; adding alloying elements in the steel ladle for deoxidizing and alloying; adding alkaline covering slag on the surface of molten steel in the steel ladle; alloying in the steel ladle, comprising uniformly mixing chemical elements with the total weight of W required during deoxidizing and alloying with alkaline covering slag not less than 50% of the total weight W of the added chemical elements, inserting a blow pipe into the molten steel through an opening on an alloy cover, at the place 200-350mm away from the lower part of the steel-making tundish, blowing molten steel with nitrogen or inert gas until alloying is finished; standing for 3-5 minutes so that occluded substances in the molten steel float completely and enter the covering slag; and carrying out regular subsequent operation. By adding deoxidizer and covering slag in the molten steel, the deoxidizing and alloying efficiency can be improved, the alloy yield is improved by 5-8%, occluded substances in the molten steel can be reduced by 25-30%, and burning loss of alloy can be avoided.

Description

technical field [0001] The invention relates to deoxidation and alloying of molten steel, in particular to a method for deoxidation and alloying in a ladle. Background technique [0002] During the tapping process of the converter, in order to produce qualified steel products, it is necessary to deoxidize and alloy the molten steel. The total amount of ferroalloy required is composed of two parts: ferroalloy consumed by deoxidation and ferroalloy required for alloying. At present, the amount of alloy added does not calculate the amount required for deoxidation and alloying separately. Without considering the amount of deoxidation required, the empirical formula is used for calculation: [0003] Alloy addition amount = (middle limit of steel grade specification - end point residual composition %) ÷ (chemical element content % of ferroalloy x chemical element yield %) x molten steel amount (kg). [0004] In the actual production process, the oxygen content of each furnace of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06C21C7/076
CPCY02P10/20
Inventor 黄诚
Owner WUHAN IRON & STEEL ENG TECH GROUP
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