|
Brand
Item
|
Fireclay Brick
|
||||
|
N-1
|
N-2a
|
N-3a
|
N-4
|
||
|
Al2O3 %
|
≥42
|
≥40
|
≥40
|
|
|
|
Refractoriness ℃
|
≥1750
|
≥1730
|
≥1710
|
≥1690
|
|
|
Refractoriness under Load ℃
|
≥1400
|
≥1350
|
≥1320
|
≥1300
|
|
|
Reheat linear change %
|
1400℃×2h
|
+0.1～-0.4
|
+0.1～-0.5
|
|
|
|
1350℃×3h
|
|
|
+0.2～-0.5
|
+0.2～-0.5
|
|
|
Apparent porosity %
|
≤22
|
≤24
|
≤24
|
≤24
|
|
|
Cold crushing strength Mpa
|
≥29.4
|
≥24.5
|
≥19.6
|
≥19.6
|
|
