 |
Typical
Product Specification of Indian Refractories - Castables
& Monolithics
Some typical specifications of Indian refractories
commonly used in the furnaces and kilns in steel,
cement, non-ferrous metals and glass industries are
given below. These are illustrative and do not cover the
full range of products and some of the improved items
which have been recently developed.
|
CONVENTIONAL CASTABLES
|
|
CHEMICAL
PROPERTIES |
|
|
|
|
Al2O3(%) |
60
- 65
|
90
Min
|
95
- 97
|
|
SiO
2 (%) |
25-30
|
0
|
0.2
|
|
Fe
2 O3 (%) |
0.7
|
0.8
|
0.15
|
|
PHYSICAL
PROPERTIES |
|
|
|
|
Hot
Face Temp. (°C) (Max) |
1650
|
1750
|
1800
|
|
Grain
Size (mm) (Max) |
3
|
5
|
6
|
|
B.D.
Dried (g/cc) |
2.2
- 2.4
|
2.9
|
2.6
- 2.8
|
|
C.C.S.
(Kg/cm²) |
|
|
|
|
Dried
at 110°C |
350
- 550
|
1000
Min
|
550
- 650
|
|
Fired
at 1000°C |
200
- 250
|
0
|
450
- 550
|
|
Fired
at 1100°C |
0
|
550
Min
|
0
|
|
Fired
at 1300°C |
0
|
850
Min
|
0
|
|
Fired
at 1450°C |
300
- 400
|
0
|
700
- 900
|
|
PLC
(%) |
|
|
|
|
Dried
at 110°C for 3hrs |
0
|
0
|
0
|
|
Fired
at 1000°C for 3hrs |
-0.2
|
0
|
±0.2
|
|
Fired
at 1450°C for 3hrs |
-0.4
|
0
|
±0.5
|
|
Fired
at 1550°C for 3hrs |
0
|
±0.7
|
0
|
Recomended
water addn. (%)
by weight (Legend
1550°C) |
9
- 11
|
4
- 5
|
8
- 10
|
|
LOW CEMENT CASTABLES
|
|
CHEMICAL
PROPERTIES |
|
|
|
|
|
Al2O3(%)
(Min) |
45.0
|
70.0
|
90.0
|
94.0
|
|
Fe
2 O3 (%) (Max) |
0.8-1.0
|
1.5
|
1.0
|
0.3
|
|
PHYSICAL
PROPERTIES |
|
|
|
|
|
Refractoriness
(Orton) (Min) |
32
|
36
|
37
|
+40
|
|
at
temp (°C) |
1717
|
1804
|
1820
|
1900
|
|
Maximum
Service temp. (°C) |
1550
|
1600
|
1700
|
+1800
|
|
B.D.
Dry (gm/cc) (Min) at 110°C |
2.3
|
2.7
|
3.05
|
3.1
|
|
C.C.S.
(Kg/cm²) |
|
|
|
|
|
at
110°C |
700
|
750
|
950
|
1000
|
|
at
800°C |
800
|
800
|
1100
|
1050
|
|
at
1100°C |
900
|
900
|
1150
|
1100
|
|
at
1500°C |
1000
|
0
|
0
|
0
|
|
at
1550°C |
0
|
1000
|
1200
|
1250
|
|
PLC
(%) (Max) |
|
|
|
|
|
at
800°C |
±0.2
|
±0.2
|
±0.2
|
±0.2
|
|
at
1100°C |
±0.3
|
±0.3
|
±0.3
|
±0.3
|
|
at
1500°C |
±1.0
|
0
|
0
|
0
|
|
at
1550°C |
0
|
±1.0
|
±0.6
|
±0.5
|
|
% Water
required for casting |
4.5
- 5.0
|
4.0
- 4.6
|
3.5
- 4.0
|
3.8
- 4.3
|
|
Maximum
grain size (mm) |
6
|
6
|
6
|
6
|
|
|
