Product and method for carrying out magnesium or magnesium-calcium treatment on molten steel

A magnesium-calcium and molten steel technology, applied in the field of metallurgy, can solve the problems of molten steel explosion, large aluminum loss, and nitrogen increase.

Pending Publication Date: 2021-08-20
MAANSHAN XINGDA METALLURGICAL NEW MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. In the existing magnesium treatment methods, magnesium alloys with higher magnesium content are added to molten steel for magnesium treatment. However, since the melting point of magnesium alloys is still very low and the thermal conductivity is very good, when the heat of molten steel passes through the cored wire shell When it is imported, it will heat up and melt quickly, and the explosive magnesium evaporation will still occur at a very high melting rate.
[0005] 2. In the existing magnesium treatment methods, metal alloys such as aluminum-magnesium, calcium-magnesium or calcium-silicon-magnesium with low magnesium content are added to molten steel for magnesium treatment. Although this method reduces the vapor pressure of magnesium to a certain extent, it does not The magnesium content of the alloys used is mostly above 15%. In the microscopic molten pool after the rapid melting of the magnesium alloy, the accumulation of the contained magnesium element will make the partial pressure of the vapor still high, at least above 0.35Mpa. The high temperature and static pressure cannot effectively suppress the occurrence of violent evaporation and escape of magnesium at all.
[0006] 3. In the existing magnesium treatment methods, calcium and magnesium alloys

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] The present embodiment is magnesium treatment, adopts the magnesium oxide (MgO) of purity 90%, according to the molar ratio of 0.3, 0.2 and 0.5 times of oxygen in calcium or aluminum and magnesium oxide respectively: 1) Calcium, silicon content are respectively 30 % and 55% silicon calcium powder, 2) aluminum and silicon content of 22% and 35% silicon aluminum iron and 3) pure aluminum powder. The material is fully mixed to make a cored wire with an outer diameter of 10mm. The ratio of total metal silicon to magnesium in magnesium oxide in the core material ratio is 1.26, and the particle size of each material is not greater than 1.0mm. The cored wire shell is made of low-carbon steel The tape thickness is 0.55mm. The cored wire is fed into the ladle with a liquid steel volume of 118 tons at a speed of 1.5m / sec in the late stage of ladle furnace refining. The wire feeding process is basically stable, and there is no obvious phenomenon of molten steel churning and ladle ...

Embodiment 2

[0071] This embodiment carries out magnesium treatment, adopts the magnesia (MgO) of purity 90%, according to the molar ratio of 0.5 and 0.5 times of oxygen in calcium and aluminum and magnesium oxide respectively, mixes 1) Calcium, silicon content is respectively 30% and 55% % silicon-calcium powder and 2) aluminum powder with an aluminum content of 99%, fully mixed to make a cored wire with an outer diameter of 10mm, the ratio of total silicon to magnesium in magnesia in the core material ratio is 1.51, each material The particle size is not more than 1.0mm, and the thickness of the cored wire low-carbon steel strip is 0.7mm. The cored wire is fed into the ladle with a molten steel volume of 120 tons at a speed of 1.2m / sec in the late stage of ladle furnace refining. The wire feeding process is basically stable, and there is no obvious phenomenon of molten steel churning and ladle top slag being involved. After weak stirring by argon blowing in the ladle, 19ppm of magnesium ...

Embodiment 3

[0075] This embodiment carries out magnesium-calcium treatment, adopts the magnesia (MgO) of purity 90%, according to the molar ratio of 0.2 and 1.0 times of oxygen in calcium and aluminum and magnesium oxide respectively, mixes and mixes and mixes 1) Calcium, silicon content is respectively 30 % and 55% calcium calcium powder and 2) aluminum powder with an aluminum content of 99%, and calcium silicon powder for calcium treatment according to 1.8 times the weight of magnesium oxide powder, silicon content of 30% and 55% respectively, After fully mixing, make a cored wire with an outer diameter of 10 mm. The molar ratio of total silicon to magnesium in magnesium oxide in the core material ratio is 2.4. The particle size of each material is not greater than 1.5 mm. The inner layer of the cored wire is low-carbon steel strip. The thickness is 0.5mm, and the thickness of the outer steel strip is 0.5mm. In the late stage of ladle furnace refining, the cored wire is fed into the lad...

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Abstract

The invention discloses a product and a method for carrying out magnesium or magnesium-calcium treatment on molten steel, and belongs to the technical field of metallurgy. The product for carrying out the magnesium or magnesium-calcium treatment on the molten steel is composed of a sealed shell and an alloying material packaged in the shell, the alloying material comprises magnesium oxide, a composite reducing agent and a stable diluent, wherein the composite reducing agent is used for reducing magnesium in the magnesium oxide, and the stable diluent is used to provide a substance that forms a miscible alloy melt with magnesium. According to the technical method of the invention, the product is inserted into the deep position of molten steel, a reduction reaction of magnesium oxide is excited through the energy of the molten steel, magnesium metal is stabilized, diluted and dispersed by forming the magnesium alloy miscible melt through gradual reduction, rapid evaporation of magnesium in the magnesium modification treatment process of inclusions in steel can be effectively inhibited, the gasification and oxidation loss of magnesium is reduced, the yield of the magnesium element in the steel is improved and stabilized, and the purity of the molten steel after magnesium treatment is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and more specifically relates to a product and a method for treating molten steel with magnesium or magnesium-calcium by using magnesium oxide instead of magnesium alloy. Background technique [0002] Magnesium or magnesium-calcium composite treatment of molten steel to improve the performance of steel is a new process for modifying and denaturing inclusions in steel that has attracted more and more attention from metallurgists after the previous calcium treatment and is constantly exploring. method. Adding magnesium to molten steel can carry out composite deoxidation with oxygen-controlling elements such as aluminum and calcium more deeply, and generate magnesium spinels with smaller size and more dispersed distribution. These spinels will become the core of subsequent MnS-MgS precipitation, The inclusions formed by the package are also highly dispersed, miniaturized and have a certain resis...

Claims

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Application Information

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IPC IPC(8): C21C7/00C22B5/04C22B26/22
CPCC21C7/0006C21C7/0056C22B5/04C22B26/22
Inventor 乌力平李国安邱艳生
Owner MAANSHAN XINGDA METALLURGICAL NEW MATERIAL
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