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A method of suppressing the clogging of rare earth molten steel pouring nozzle by using pulse current

A technology of pulse current and molten steel, which is applied in the direction of manufacturing tools, casting molten material containers, casting equipment, etc., and can solve problems such as nodulation and blockage of nozzles

Active Publication Date: 2021-11-30
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of this, the present invention aims at proposing a method of suppressing rare earth molten steel pouring nozzles by using pulse currents to solve the problems of rare earth metal elements in molten steel eroding nozzles and rare earth inclusions adhering to nozzles causing nodules and blockages during rare earth steel smelting and pouring. Blocking method to stabilize the rare earth steel smelting continuous casting process and improve the quality of continuous casting slabs

Method used

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  • A method of suppressing the clogging of rare earth molten steel pouring nozzle by using pulse current
  • A method of suppressing the clogging of rare earth molten steel pouring nozzle by using pulse current
  • A method of suppressing the clogging of rare earth molten steel pouring nozzle by using pulse current

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Effect test

Embodiment 1

[0052] Step 1: Cut the nozzle for industrial application into a rectangular strip sample of 5×10×300. The sample was polished with 2000-grit sandpaper to make the surface smooth. Under the protection of an inert gas atmosphere, the samples were preheated to above 1000 °C in a resistance furnace.

[0053] The second step: use pure iron as the electrode, the size of the iron rod electrode The iron rods are respectively connected with the positive and negative poles of the electric pulse power supply, and the connecting wires are copper wires with good conductivity.

[0054] Step 3: The bearing steel is polished with sandpaper, and the surface oil is cleaned with acetone. Heat 1kg of bearing steel in a resistance furnace to 1550°C and keep it warm for 60 minutes to make the temperature inside the molten steel uniform. Add lanthanum and cerium rare earth metals into the molten steel, wherein the Ce composition ranges from 60% to 65%, the lanthanum La composition ranges from 30...

Embodiment 2

[0060] Step 1: Cut the nozzle for industrial application into a rectangular strip sample of 5×10×300. The sample was polished with 2000-grit sandpaper to make the surface smooth. Under the protection of an inert gas atmosphere, the samples were preheated to above 1000 °C in a resistance furnace.

[0061] The second step: use pure iron as the electrode, the size of the iron rod electrode The iron rods are respectively connected with the positive and negative poles of the electric pulse power supply, and the connecting wires are copper wires with good conductivity.

[0062] Step 3: The bearing steel is polished with sandpaper, and the surface oil is cleaned with acetone. Heat 1kg of bearing steel in a resistance furnace to 1550°C and keep it warm for 30 minutes to make the temperature inside the molten steel uniform. Lanthanum and cerium rare earth metals are added into molten steel, wherein the composition range of Ce is 60%-65%, the range of lanthanum La composition is 30%...

Embodiment 3

[0068] Step 1: Cut the nozzle for industrial application into a rectangular strip sample of 5×10×300. The sample was polished with 2000-grit sandpaper to make the surface smooth. Under the protection of an inert gas atmosphere, the samples were preheated to above 1000 °C in a resistance furnace.

[0069] The second step: use pure iron as the electrode, the size of the iron rod electrode The iron rods are respectively connected with the positive and negative poles of the electric pulse power supply, and the connecting wires are copper wires with good conductivity.

[0070] Step 3: The bearing steel is polished with sandpaper, and the surface oil is cleaned with acetone. Heat 1kg of bearing steel in a resistance furnace to 1550°C and keep it warm for 10 minutes to make the temperature inside the molten steel uniform. Add lanthanum and cerium rare earth metals into the molten steel, wherein the Ce composition ranges from 60% to 65%, the lanthanum La composition ranges from 30...

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Abstract

A method for suppressing the clogging of a rare earth molten steel pouring nozzle by using a pulse current, which relates to the field of rare earth steel smelting and casting. The corrosion reaction of the rare earth liquid steel interface improves the corrosion resistance of the inner wall of the nozzle to the rare earth molten steel, and further prevents the inclusions in the molten steel from adhering to the inner wall of the nozzle. Aiming at the problem that the rare earth metal elements in molten steel corrode the nozzle in rare earth steel smelting and pouring, and the rare earth inclusions adhere to the nozzle to cause nodules and blockage, the invention aims to propose a method for suppressing the blockage of the rare earth molten steel pouring nozzle by using pulse current. To stabilize the continuous casting process of rare earth steel smelting and improve the quality of continuous casting slabs.

Description

technical field [0001] The invention relates to the field of rare earth steel smelting and casting, in particular to a method for suppressing the clogging of a pouring nozzle of rare earth molten steel by using pulse current. Background technique [0002] As social demands become more demanding on steel properties, rare earth metals are commonly known as industrial vitamins. Adding rare earth metals in steel smelting can significantly improve the overall performance of steel materials. The chemical properties of rare earth metals are very active, and they are even called the strongest deoxidizers in the steelmaking process. Therefore, the addition of rare earths to steel has a variety of beneficial effects, including purification, modification, microalloying, and hydrogen capture. In addition, due to the strong activity of rare earth metals, rare earth metals are easy to combine with phosphorus, oxygen, and sulfur in molten steel, and have a metamorphic effect on inclusions...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/10B22D41/50
CPCB22D11/10B22D41/505
Inventor 张新房闫龙格
Owner UNIV OF SCI & TECH BEIJING
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