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Refractory


Slagging Briquette for converter maintenance

MgO                  CaO               SiO2               H2O                          Size

≥68%               ≤3%             ≤3%             ≤2%          5-70,  30-80mm 90% min.

≥66%               ≤3%             ≤3%             ≤2%

≥64 %              ≤3%             ≤3%             ≤2%

Magnesium Carbon Briquette for converter maintenance

MgO                C                   IL                  SiO2               H2O                   Size

≥60%         10-15%        ≤25%              ≤6%              ≤2%          10-40mm 90% min.

≥55%         8-12%          ≤30%              ≤6%              ≤2%

≥40 %        8-12%          ≤25%              ≤6%              ≤2%

≥38 %        ≥28%           ≤28%             ≤6%              ≤2%

Caustic Calcined Magnesite

MgO                    SiO2                  CaO                   IL

≥96%                ≤0.5%              ≤1.0%              ≤3.0%

≥95%                ≤1.0%              ≤1.5%              ≤3.0%

≥94%                ≤2.0%              ≤2.0%              ≤4.0%

≥92 %               ≤3.0%              ≤2.0%               ≤5.0%

≥90%                ≤4.0%              ≤2.5%              ≤6.0%

≥87%                ≤5.0%              ≤3.5%               ≤7.0%

≥85 %               ≤6.0%              ≤4.0%               ≤8.0%

Size:  -0.125mm,  -0.3mm,  -1.5mm,  0.3-2mm,  -100mesh,  -120mesh

Gunning mix for electric furnace

Max. service temperature

1750℃

Usage amount during construction (MT/m3)

2.3

Specific Gravity after construction (MT/m3)

110℃

2.35

1000℃

2.30

Crushing Strength ( kg/cm3)

110℃

7

1000℃

20

1300℃

25

1500℃

60

Thermal conductivity (Kcal/m-h-℃)

0.65+

0.0003+

Drying thermal refractory for big surface of converter

MgO+CaO              C                 Fe2O3                    BD. g/cm3                       Strength (MPa)

  ≥80                 6~8%              ≤2%              ≥2.4 (1000℃×3h)            ≥15 (1000℃×3h)

Basic tundish gunning and coating material

　

MgO  %

≥83

≥80

≥82

CaO  %

 

≥6

 

Bulk density , 110℃×12h, (g/cm3)

≥2.0

≥2.3

≥1.7

Strength (Mpa)

110℃×12h

≥5

≥5

≥3

1500℃×3h

≥10

≥10

≥6

Rate of linear change, 1500℃×3h

-2.0-0

-2.0-0

-2.0-0

Water addition during construction

15-18

18-20

18-20

Max. service temperature, ℃

1750

1750

1750

　

Ramming material for electric furnace bottom

MgO               CaO             Fe2O3                  SiO2                  IL

≥82%            6-9%             5-7%                  ≤1.5%            ≤0.5%

Size: 0-6mm 90% min.

Ladle refractory castable

Al2O3               Fe2O3               MgO                 Bulk Density

75-80%            ≤3%                 9-11%       ≥2.60 g/cm3

Iron ditch refractory castable

Al2O3  %

≥72

≥70

≥60

SiC + C  %

≥15

≥12

≥12

Bulk density, (g/cm3)

110℃×12h

≥3.10

≥2.80

≥2.25

1450℃×3h

≥3.05

≥2.75

≥2.50

Bending Strength (Mpa)

110℃×12h

≥6

≥5

≥5

1450℃×3h

≥10

≥8

≥8

Crushing Strength (Mpa)

110℃×12h

≥40

≥40

≥40

1450℃×3h

≥50

≥50

≥50

Rate of linear change, 1500℃×3h

±0.5

±0.5

±0.5

Water addition during construction, %

3.7-4.5

5-6

6-7

Magnesia Carbon Brick

Item No.

MgO

≥ %

C

≥ %

Bulk Density,

≥ g/cm3

Apparent Porosity,

≤ %

Cold crushing strength,

≥ MPa

Hot bending strength 

(1450℃×0.5h)

≥ MPa

MC-10A

82

10

3.10

3

45

10

MC-10B

80

10

3.00

4

40

8

MC-10C

78

10

3.00

4

40

6

MC-14A

78

14

2.98

3

40

14

MC-14B

76

14

2.95

4

40

10

MC-14C

74

14

2.95

4

35

8

MC-18A

74

18

2.95

3

35

12

MC-18B

72

18

2.95

4

35

10

MC-18C

70

18

2.90