Gunnig mix

Item

1

2

3

4

5

6

Chemical Composition %

Al2O3

≥30

42

45

48

≥60

66

SiO2

≥40(SiC)

40

42

43

24

27

Fe2O3

≤1.2

1.4

2.2

0.9

1.2

1.8

Compressive strength MPa

110°C

35

29

29

26

35

58

600°C

-

40

27(700°C)

28

-

34(800°C)

1000°C

30

31

14

38

30

-

1200°C

≥55

(1500°C)

-

15

-

≥55

(1500°C)

24

Bending Strength MPa

1000°C

-

7.0

3.1(700°C)

9

-

-

Reheating linear change %

1000°C

±0.4

-0.2

-0.12

-0.2

±0.41

-0.3

(1200°C)

Refractoriness under load °C 

4%

1320

-

1314

-

-

1300

Apparent porosity %

15.1

23.0

17.6

18.0

18.0

22.0

Bulk density g/cm3

2.35

2.06

2.14

2.32

≥2.34

2.52

Item

1

2

3

4

Chemical Composition %

MgO

80

96

76

93

CaO

3

-

10

5

SiO2

4

1.6

2.3

-

Bending Strength MPa

1000°C

7

6.4

7.8

4.2

1500°C

6.4

8.0

9.8

5.6

Bonding strength

1400°C

2.0

-

-

3.4

Bulk density g/cm3

2.45

2.70

2.66

2.58

Item

Al2O3-SiC-C based gunning mixes

Chemical Composition %

Al2O3

67

70

22

SiC

14

10

60

SiO2

-

-

15

CaO

-

-

1.4

F.C

3

3

-

Bulk density g/cm3

2.56(110°C)

2.75(110°C)

2.5(816°C)

2.62(1450°C)

2.73(1450°C)

Apparent porosity %

18.5(110°C)

21.6(110°C)

16.0(816°C)

9.6(1450°C)

20.0(1450°C)

Strength Mpa

Bending Strength

16.0(110°C)

19.6(1450°C)

Bending Strength

2.5(110°C)

6.7(1450°C)

Compressive strength MPa

83(816°C)

Reheating linear change %

-0.50(1450°C)

＋0.11

-0.1(816°C)

water content to mixture %

6

6

6