Refractory plate for a slide gate valve, use of a fused raw material as a material in such a plate and a melting vessel comprising such a plate

Patent metadata

Field	Value
Publication number	US-2020339479-A1
Application number	US-201816761157-A
Country	US
Kind code	A1
Filing date	Jul 17, 2018
Priority date	Nov 8, 2017
Publication date	Oct 29, 2020
Grant date	—

Abstract

The invention relates to a refractory plate for a sliding shutter for regulating a flow rate of liquid steel, to the use of a melt raw material as material in a plate of this kind and to a melt vessel for receiving liquid steel which has a plate of this kind for regulating a flow rate of liquid steel from the melt vessel.

First claim

1 . A refractory plate for a slide gate valve for controlling a flow rate of liquid steel, comprising a fused raw material, wherein the fused raw material comprises the following elements each in a proportion in the range of the following mass fractions:
aluminum: 46 to 55% by mass; oxygen: 42 to 49% by mass; carbon: 0.1 to 3% by mass; silicon: 0.1 to 4% by mass.

2 . Plate according to claim 1 , wherein the fused raw material comprises the phase Al 28 C 6 N 6 O 21 .

3 . Plate according to claim 1 , wherein the fused raw material comprises the phase Al 28 C 6 N 6 O 21 in a proportion in the range from 0.05 to 10% by mass.

4 . Plate according to claim 1 , wherein the fused raw material comprises the element nitrogen.

5 . Plate according to claim 1 , wherein the fused raw material comprises the element nitrogen in a proportion of at most 0.3% by mass.

6 . Plate according to claim 1 , wherein the fused raw material comprises the elements aluminum, oxygen, carbon, silicon and nitrogen in a total proportion of at least 98% by mass.

7 . Plate according to claim 1 , wherein the fused raw material comprises metallic silicon.

8 . Plate according to claim 1 , wherein the fused raw material comprises the phase SiC.

9 . Plate according to claim 1 , wherein the fused raw material comprises the phase corundum.

10 . Plate according to claim 1 , which comprises the fused raw material in a proportion in the range from 3 to 70% by mass.

11 . Plate according to claim 1 in the form of either an unfired or fired carbon bonded product.

12 . Plate according to claim 1 , which has at least one of the following physical values:
Thermal expansion coefficient <9.0*10−6 K −1 ; Dynamic modulus of elasticity (Young's modulus) at 1,400° C. in reducing atmosphere (sound travel time measurement) <65 GPa; Cold bending strength >15 MPa; Hot bending strength at 1,400° C. in reducing atmosphere >13 MPa; Work at break Gf at 1,400° C. in reducing atmosphere >250, in particular >300 J/m 2 ; Nominal notched tensile strength σNT at 1,400° C. in reducing atmosphere >5 MPa; Thermal shock parameter R according to Kingery at 1,400° C. >10 K; Thermal shock parameter R st according to Hasselmann at 1,400° C. >5.5 K*m 1/2 .

13 . A method comprising:
using a fused raw material as raw material in a plate for a slide gate valve, wherein the fused raw material comprises the following elements each in a proportion in the range of the following mass fractions: aluminum: 46 to 55% by mass; oxygen: 42 to 49% by mass; carbon: 0.1 to 3% by mass; silicon: 0.1 to 4% by mass.

14 . Melting vessel for receiving liquid steel, wherein the melting vessel comprises at least one plate for controlling a flow rate of liquid steel from the melting vessel, wherein the at least one plate comprises a fused raw material, wherein the fused raw material comprises the following elements each in a proportion in the range of the following mass fractions:
aluminum: 46 to 55% by mass; oxygen: 42 to 49% by mass; carbon: 0.1 to 3% by mass; silicon: 0.1 to 4% by mass.

15 . Melting vessel according to claim 14 in the form of a ladle or tundish in a continuous casting plant for casting steel.

Assignees

• Refractory Intellectual Property Gmbh & Co Kg

Inventors

• Grasset-Bourdel Renaud
• Wiesel Martin
• Meurillon Vincent
• Taferner Harald

Classifications

• B22D41/32

  characterised by the materials used therefor · CPC title

• C04B2235/5427

  millimeter or submillimeter sized, i.e. larger than 0,1 mm · CPC title

• C04B2235/96

  Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance · CPC title

• C04B2235/3248

  Zirconates or hafnates, e.g. zircon · CPC title

• C04B2235/349

  Clays, e.g. bentonites, smectites such as montmorillonite, vermiculites or kaolines, e.g. illite, talc or sepiolite · CPC title