Item

Corundum castable for roof

Refractory pre-cast shapes for roof

Tap hole filler

Dry ramming mix for bottom

Gunning mix

Max. service temperature, ≥

1750^oC

-

-

-

-

Al₂O₃, % ≥

82

82

-

-

-

MgO, % ≥

-

-

50

80

86

CaO, % ≤

2.0

2.0

-

4~10

SiO₂, % ≤

-

-

35~40

2.0

-

Fe₂O₃, %

-

-

-

4~10

-

Cr₂O₃, %

-

2~5

-

-

-

Bulk density g/cm³, ≥

110^oC×24h

2.9

2.9

-

2.3
Apparent density

2.2

1600^oC×3h

2.9

-

-

-

CCS,MPa, ≥

110^oC×24h

30

30

-

-

60

1600^oC×3h

40

-

-

80

-

MOR MPa, ≥

110^oC×24h

6.0

6.0

-

-

-

1600^oC×3h

8.0

-

-

-

4.0(1500×3h)

Refractoriness, ,

-

-

1710~1750

-

-

Grain size distribution, %

-

-

>6mm,≤10

-

<3mm,≥90

>1mm,≥35

<0.074mm,≥20

Linear change after heating, %

0.2~+0.6
(1600^oC×5h)

-

-

-

0.0~0.4
(1500^oC×3h)

Application

Used for in situ casting or pre-cast for tri-angle area of UHP EAF roof

Used as fill the tap hole of EBT

Used as dry ramming of UHP EAF bottom

Used for slag zone gunning of EAF