ITEM	Firebricks for Steel Ladle
INDEX	CN-40	CN-42
Al2O3 %≥	40	42
Refractoriness，℃≥	1730	1750
0.2MPa refractoriness under load，℃≥	1400	1430
Linear change after heating，%1400℃  2h	0 -0.3	0 -0.3
Apparent Porosity，%≤	19	18
Cold Crushing Strength，MPa≤	34.3	39.2