Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for inhibiting blockage of rare earth molten steel pouring nozzle through pulse currents

A technology of pulse current and molten steel, which is applied in the direction of manufacturing tools, casting molten material containers, metal processing equipment, etc., can solve the problems of nozzle nodulation and blockage, and achieve the effect of inhibiting blockage

Active Publication Date: 2020-11-10
UNIV OF SCI & TECH BEIJING
View PDF5 Cites 15 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for inhibiting blockage of rare earth molten steel pouring nozzle through pulse currents
  • Method for inhibiting blockage of rare earth molten steel pouring nozzle through pulse currents
  • Method for inhibiting blockage of rare earth molten steel pouring nozzle through pulse currents

Examples

Experimental program
Comparison scheme
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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
lengthaaaaaaaaaa
current densityaaaaaaaaaa
Login to View More

Abstract

The method includes the steps that an electrode is inserted into rare earth molten steel, the pulse currents are applied to the electrode through a power supply device, the erosion reaction between the inner wall of the nozzle and an interface of the rare earth molten steel is intervened through the pulse currents, the rare earth molten steel corrosion resistance of the inner wall of the nozzle isimproved, and inclusions in the molten steel are further prevented from adhering to the inner wall of the nozzle. The method for inhibiting blockage of the rare earth molten steel pouring nozzle through the pulse currents is provided in order to solve the problems that rare earth metal elements in the molten steel erode the nozzle and rare earth inclusions adhere to the nozzle to cause nodulationand blockage of the nozzle in rare earth steel smelting and pouring, so that a rare earth steel smelting and continuous casting process is stabilized, and the quality of continuous casting billets isimproved. The invention discloses a method for inhibiting blockage of a rare earth molten steel pouring nozzle through pulse currents, and relates to the field of rare earth steel smelting and casting.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/10B22D41/50
CPCB22D11/10B22D41/505
Inventor 张新房闫龙格
Owner UNIV OF SCI & TECH BEIJING
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com