Fire clay brick
Item
General clay firebricks
Firebricks for blast furnace
Firebricks for hot-blast stove
Firebricks for pouring
Firebricks for the lining of temming ladle
Firebricks for steel pouring
Low pore firebricks
Brand
N-2a
GN-42
RN-42
JZN-40
CN-40
SN-40
XN-40 KN-40 ZN-40
DN-40
Al2O3, % min
42
40
Fe2O3, % max
--
1.7
Refractoriness
(℃) min
1730
1750
1710
Refractoriness under load of 0.2Mpa(℃) min
1350
1430
1400
1370
(SN-40, KN-40)
1390
Apparent porosity, % max
24
16
17-25
19
15-23 (SN-40)
22 (KN-40)
15-25(XN-40)
23(ZN-40)
15
Linear change on reburning, %
+0.1
-0.5
1400℃X 2h
0
-0.3
1450℃ X 2h
-0.4
1450℃X 2h
1350℃ X 2h
1400℃ X 2h
(XN-40)