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High Alumni Bricks forElectric ArcFurnace Roofs

　　　　　　　　　　　　Brand
Item		 Burned bricks Unburned bricks
DL-80 DL-75 DL-65 DLB-75 DLB-80
AL2O3% ≧80 ≧75 ≧65 ≧75 ≧80

Refractoriness ℃		 ≧1790 ≧1790 ≧1790 ≧1770 ≧1790


Refractoriness under load KD℃

 ≧1550 ≧1530 ≧1520 T3≧1500 T3≧1530
%
Permanent linear change on reheating %		 1550℃×2h
0-0.3 		1550℃×2h
0-0.4 		1500℃×2h
0-0.4		    

Apparent porosity %		 Roof brick % ≦21 ≦21 ≦23 ≦22 ≦24
Skew brick

Cold crushing strength MPa		 ≧78.5 ≧68.5 ≧58.8 ≧29.4 ≧34.3

Application

Steel making electric and furnace roofs
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