US2005280192A1PendingUtilityA1

Zirconia refractories for making steel

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Assignee: CARSON GRAHAMPriority: Jun 16, 2004Filed: Jun 16, 2004Published: Dec 22, 2005
Est. expiryJun 16, 2024(expired)· nominal 20-yr term from priority
Inventors:Graham James CarsonRobert Gerard Nooning, Jr.David J. Sosinsky
B22D 41/54B22D 11/0622B22D 11/06B22D 41/02B22D 11/064C04B 35/48B22D 11/10
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Claims

Abstract

A refractory material for steelmaking is comprised of 50 to 95% zirconia (ZrO 2 ), 0 to 35% of silica (SiO 2 ), 5 to 35% carbon (C), less than 5% alumina (Al 2 O 3 ) and anti-oxidant such as silicon (Si) metal and a carbide. The anti-oxidant may be in amounts up to about 10% by weight. The refractory material has application in making delivery nozzles and transition pieces. Disclosed also is a method of continuous casting steel strip comprising the steps of assembling a pair of casting rolls having a nip between them; assembling a delivery system for delivering molten steel to form a casting pool comprised of at least some refractory material for contacting the molten steel comprised of 50 to 95% zirconia, 0 to 35% silica, 5 to 35% carbon, less than 5% alumina and anti-oxidant and carbides, and rotating the casting rolls to form thin steel strip delivered downwardly through the nip.

Claims

exact text as granted — not AI-modified
1 . A refractory for molten metal delivery in making steel comprising 50 to 85% by weight zirconia, 0 to 35% by weight silica, less than 5% alumina, 5 to 35% carbon and an anti-oxidant.  
   
   
       2 . The refractory for molten metal delivery in making steel as claimed in  claim 1  wherein the percent by weight of zirconia is between 60 and 85% by weight.  
   
   
       3 . The refractory for molten metal delivery in making steel as claimed in  claim 1  wherein the percent by weight of zirconia is between 70 and 80% by weight.  
   
   
       4 . The refractory for molten metal delivery in making steel as claimed in  claim 1  wherein the percent by weight of carbon is between 8 and 30% by weight.  
   
   
       5 . The refractory for molten metal delivery in making steel as claimed in  claim 1  wherein the percent by weight of carbon is between 10 and 20% by weight.  
   
   
       6 . The refractory for molten metal delivery in making steel as claimed in  claim 1  wherein the refractory material is stabilized with lime, magnesium oxide or a combination thereof.  
   
   
       7 . The refractory for molten metal delivery in making steel as claimed in  claim 1  wherein the anti-oxidant comprises up to about 10% by weight.  
   
   
       8 . A refractory for molten metal delivery in making steel by continuous casting steel strip comprising 50 to 85% zirconia, 0 to 35% silica, less than 5% alumina, 5 to 35% carbon and an anti-oxidant.  
   
   
       9 . The refractory for molten metal delivery in making steel by continuous casting strip as claimed in  claim 8  wherein the percent by weight of zirconia is between 60 and 85% by weight.  
   
   
       10 . The refractory for molten metal delivery in making steel by continuous casting strip as claimed in  claim 8  wherein the percent by weight of zirconia is between 70 and 80% by weight.  
   
   
       11 . The refractory for molten metal delivery in making steel by continuous casting strip as claimed in  claim 8  wherein the percent by weight of carbon is between 8 and 30% by weight.  
   
   
       12 . The refractory for molten metal delivery in making steel by continuous casting strip as claimed in  claim 8  wherein the percent by weight of carbon is between 10 and 20% by weight.  
   
   
       13 . The refractory for molten metal delivery in making steel by continuous casting strip as claimed in  claim 8  wherein the refractory material is stabilized with lime, magnesium oxide or a combination thereof.  
   
   
       14 . The refractory for molten metal delivery in making steel by continuous casting strip as claimed in  claim 8  wherein the anti-oxidant comprises up to about 10% by weight.  
   
   
       15 . A delivery nozzle for making steel by continuously casting steel strip having a composition comprising 50 to 85% zirconia, 0 to 35% silica, less than 5% alumina, 5 to 35% carbon, and an anti-oxidant.  
   
   
       16 . The delivery nozzle for making steel by continuous casting strip as claimed in  claim 15  wherein the percent by weight of zirconia is between 60 and 85% by weight.  
   
   
       17 . The delivery nozzle for making steel by continuous casting strip as claimed in  claim 15  wherein the percent by weight of zirconia is between 70 and 80% by weight.  
   
   
       18 . The delivery nozzle for making steel by continuous casting strip as claimed in  claim 15  wherein the percent by weight of carbon is between 8 and 30% by weight.  
   
   
       19 . The delivery nozzle for making steel by continuous casting strip as claimed in  claim 15  wherein the percent by weight of carbon is between 10 and 20% by weight.  
   
   
       20 . The delivery nozzle for making steel by continuous casting strip as claimed in  claim 15  wherein the refractory material is stabilized with lime, magnesium oxide or a combination thereof.  
   
   
       21 . The delivery nozzle for making steel by continuous casting strip as claimed in  claim 15  wherein the anti-oxidant comprises up to about 10% by weight.  
   
   
       22 . A transition piece nozzle block for flow control in making steel by continuously casting steel strip having a composition comprising 50 to 85% zirconia, 0 to 35% silica, less than 5% alumina, 5 to 35% carbon and an antioxidant.  
   
   
       23 . The transition piece nozzle block for making steel by continuous casting strip as claimed in  claim 22  wherein the percent by weight of zirconia is between 60 and 85% by weight.  
   
   
       24 . The transition piece nozzle block for making steel by continuous casting strip as claimed in  claim 22  wherein the percent by weight of zirconia is between 70 and 80% by weight.  
   
   
       25 . The transition piece nozzle block for making steel by continuous casting strip as claimed in  claim 22  wherein the percent by weight of carbon is between 8 and 30% by weight.  
   
   
       26 . The transition piece nozzle block for making steel by continuous casting strip as claimed in  claim 22  wherein the percent by weight of carbon is between 10 and 20% by weight.  
   
   
       27 . The transition piece nozzle block for making steel by continuous casting strip as claimed in  claim 22  wherein the refractory material is stabilized with lime, magnesium oxide or a combination thereof.  
   
   
       28 . The transition piece nozzle block for making steel by continuous casting strip as claimed in  claim 22  wherein the anti-oxidant comprises up to about 10% by weight.  
   
   
       29 . A method of continuously casting steel strip comprising the steps of: 
 a. assembling a pair of cooled casting rolls having a nip between them and with confining closure adjacent the ends of the nip;    b. assembling a metal delivery system for delivering a molten steel between the casting rolls to form a casting pool supported therebetween comprised of at least some refractory material for contacting the molten steel comprised of 50 to 85% zirconia, 0 to 35% silica, less than 5% alumina, 5 to 35% carbon and anti-oxidant; and    c. counter-rotating the casting rolls to form metal shells on the surfaces of the casting rolls and solidified thin steel strip delivered downwardly through the nip between the casting rolls.    
   
   
       30 . The method of continuously casting steel strip as claimed in  claim 29  wherein the percent by weight of zirconia is between 60 and 85% by weight.  
   
   
       31 . The method of continuously casting steel strip as claimed in  claim 29  wherein the percent by weight of zirconia is between 70 and 80% by weight.  
   
   
       32 . The method of continuously casting steel strip as claimed in  claim 29  wherein the percent by weight of carbon is between 8 and 30% by weight.  
   
   
       33 . The method of continuously casting steel strip as claimed in  claim 29  wherein the percent by weight of carbon is between 10 and 20% by weight.  
   
   
       34 . The method of continuously casting steel strip as claimed in  claim 29  wherein the refractory material is stabilized with lime, magnesium oxide or a combination thereof.  
   
   
       35 . The method of continuously casting steel strip as claimed in  claim 29  wherein the anti-oxidant comprises up to about 10% by weight.

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