Stopper refractory products for steel teeming from ladle

Stopper tubes

SHST-32

SHST-35

MLST-63

MKST-73

MKSTT-73

MKBST-75

GOST R 53066-2008

Mass fraction, %:

Al₂O₃, no less

Fe₂O₃, no more

32

-

35

-

63

1,3

73

1,1

73

1,5

75

2,2

Refractory property, °C, no low than

1690

1710

-

-

-

- 

Open porosity, %, in the limit of:

- semidry pressing

- soft mud shaping

15-26

19-26

16-21

-

16-20

-

no more
24

-

17-22

-

Residual changes in the sizes during heating, %, no more than, at the temperature:

1350 °C

1400 °C

0,3

-

-

0,1

-

0,1

-

0,3

-

0,1

Thermal resistance, thermal cycling , no less

1

2

2

3

2

Stopper pocket brick

SHSG-32

MLSG-62

GOST R 53066-2008

Mass fraction, %:

Al₂O₃ no less

32

over
62

Fe₂O₃, no more

-

1,5

Refractory property, °C, no low

1690

-

Open porosity, %, no more

23

24

Compressive resistance, N/mm², no less

15

25

Onset temperature of softening, °C, no low

-

1450

Residual change in dimensions at the temperature 1500°C, no more

-

0,4

Stopper head

SHSP-32

SHSP-34

GOST R 53066-2008

Mass fraction, %:

Al₂O₃, no less

32

34

Refractory property, °C, no low

1690

1710

Open porosity, %, in the limit of:

- semidry pressing

- soft mud shaping

15-20

18-23

15-20

18-22

Onset temperature of softening, °C, no low

- semidry pressing

- soft mud shaping

1320

1350

Thermal resistance, thermal cycling , no less

1

3

Stopper nozzle

SHSS-32

SHSS -34

MLSS-62

GOST R 53066-2008

Mass fraction, %:

Al₂O₃, no less

Fe₂O₃, no more

32

-

34

-

over 62

1,5

Refractory property, °C, no low

1690

1710

-

Open porosity, %, no more

22

20

24

Onset temperature of softening, °C, no low

1350

-