| Download |
 pdf-document (160 kb) |
|
| Summary |
TUNCAST is a low-density, monolithic, spray that forms
the working lining in the tundish. |
|
| Description |
TUNCAST is a chemically basic, sprayable lining material
combining magnesia filler of selected granulometry, specific
bonding materials and fibrous constituents to form a
mass with optimum rheological properties when mixed with
the correct amount of water. On curing, the sprayed lining
develops a chemical bond, which is supplemented by a
ceramic bond in contact with liquid steel. |
|
| Application |
The TUNCAST powder is first mixed with a predetermined
amount of water in a continuous ‘kneader’ mixer
with an Archimedean screw, and then sprayed onto the
tundish permanent refractory lining using purpose designed
spraying equipment. A variable speed controller permits
the slurry mix to be delivered to the tundish at up to
70Kg per minute. After installation, the lining is cured
by heating it over a predetermined curing cycle. The
cured lining can then be used as either a cold start
or hot tundish system after full preheating to around
1000°C. |
|
| Function |
The insulating properties of a TUNCAST spray tundish
lining ensure that a good temperature profile is maintained
during casting, and being a basic material, steel cleanliness
is not impaired. The product is designed to provide a
friable residue between the skull and the permanent lining
after the casting is over, to facilitate smooth deskulling. |
|
| Benefits |
 |
Monolithic construction reduces the chances of
metal penetration. |
|
Lower density provides insulating properties superior
to other monolithic lining systems.
|
|
TUNCAST can be used with or without preheat after
curing.
|
|
Lining thickness can be selectively varied at critical
tundish areas like slag line and ladle stream
impact zones to facilitate long sequence casts.
|
|
More than thirty hours of casting can be achieved
under the right conditions.
|
|
