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PRODUCT
tunbish coating

tunbish coating features:low thermal coefficient 、erosion-resistance、purify molten steel 、翻包率高等特点,used in tunbish working liner。

tunbish coating index:

item 

index 

magnesia 

magnesia calcium

magnesia chrome

CZT - 1

CZT - 2

CZT - 3

CZT - 4

CZT - 4

chemical composition

MgO

83

81

88

72

66

Cr 2 O 3

10

Al 2 O 3

4.0

2.9

1.1

1.54

2.5

Fe 2 O 3

1.2

1.7

1.0

12.3(CaO)

3.3

compressive strength MPa

110 ℃

27

8

9

6.4

1500 ℃

20

4(1300 ℃ )

13

18.5

folding strength MPa

110 ℃

3.7

3.1

2.5

0.7

1500 ℃

4.7

4.0(1400 ℃ )

5.1

9.6

3.1(1550 ℃ )

linear change rate after burning %

1500 ℃

- 1.73

- 1.82

± 1.5

thermal conduction  W/m·k

1000 ℃

1.5 ( 1200℃ )

0.93

0.83

volume density g/cm 3

2.46

2.98

2.25

2.10

2.68

usage 

tunbish working lining,can be operated by person daubing or machine gunning

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