Refractories for the blast furnace cast house, converter, electric arc furnace, ladle and tundish. The range covers magnesia-carbon bricks, gas-purging plugs, taphole clay, trough mixes, hot-repair gunning masses, dry vibration mixes and flow-control shapes.
03.01
Magnesia-carbon bricks
Magnesia-carbon and alumina-magnesia-carbon brick grades for iron- and steelmaking refractory applications. The table compares composition, apparent porosity, bulk density and mechanical strength.
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Magnesia-carbon and alumina-magnesia-carbon bricks
Porous plugs for continuous-casting and refining ladles. The range offers high strength, erosion and corrosion resistance, with the gas-flow characteristics shown below.
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Porous plugs
Property
HD-TQZ1
HD-TQZ2
Al₂O₃ + Cr₂O₃ (%)
95
93
Bulk density (g/cm³)1500°C × 3h
3.2
3.0
Modulus of rupture (MPa)1500°C × 3h
15
12
Cold crushing strength (MPa)110°C × 24h
40
45
Cold crushing strength (MPa)1500°C × 3h
100
90
Permanent linear change (%)1500°C × 3h
±0.5
±0.5
Gas flow rate (NL/min)at 0.2~0.8 MPa gas pressure
300~800
300~800
Chemical composition is given as combined Al₂O₃ + Cr₂O₃ content.
Typical values from the product data sheets. Properties for a specific order are confirmed in the quotation.
Alumina-silicon-carbide-carbon ramming mixes, vibration castables, self-flowing castables and precast blocks. Castables serve large blast furnaces; drying-free ramming mixes and precast shapes serve medium and small furnaces.
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Al₂O₃-SiC-C trough materials
Property
HD-TD1Ramming mix
HD-TD2Ramming mix
HD-TJ1Castable
HD-TJ2Castable
HD-TZ1Self-flowing castable
HD-TZ2Self-flowing castable
Al₂O₃ (%)
50
65
60
70
55
65
SiC + C (%)
10
10
10
8
25
17
Bulk density (g/cm³)110°C × 24h
2.2
2.4
2.5
2.6
2.5
2.6
Modulus of rupture (MPa)110°C × 24h
2.0
2.0
4.0
5.0
4.5
5.0
Modulus of rupture (MPa)1450°C × 3h
3.0
3.0
5.0
6.0
8.0
7.0
Cold crushing strength (MPa)110°C × 24h
10
10
15
15
25
25
Cold crushing strength (MPa)1450°C × 3h
13
15
35
25
35
35
Permanent linear change (%)1450°C × 3h
±0.5
±0.5
±0.5
±0.5
±0.5
±0.5
Typical values from the product data sheets. Properties for a specific order are confirmed in the quotation.
Magnesia-calcium dry repair material using a carbon-ceramic binder system. Intended for hot repair of electric arc furnace hearths, with short sintering time and good flow.
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MgO-CaO hearth repair mass
Property
HD-DB-1
HD-DB-2
HD-DB-3
HD-DB-4
MgO (%)
38
45
55
70
CaO (%)
10
8
8
5
C (%)
5
6
5
5
Bulk density (g/cm³)100°C
2.4
2.2
2.5
2.55
Cold crushing strength (MPa)
30
25
35
30
Typical values from the product data sheets. Properties for a specific order are confirmed in the quotation.
Magnesia-based material for hot repair of converter linings, trunnion areas and steel-tapping zones. Pitch- and resin-bonded grades provide high-temperature flow and erosion resistance.
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Converter hot-repair gunning mass
Property
HD-RX1Pitch-bonded
HD-RX2Pitch-bonded
HD-RX3Resin-bonded
HD-RX4Resin-bonded
Binder type
Pitch
Pitch
Resin
Resin
MgO (%)
65
70
75
80
C (%)
10
12
8
5
Bulk density (g/cm³)1500°C × 3h
2.2
2.2
2.1
2.1
Modulus of rupture (MPa)1500°C × 24h
5
6
5
6
Max. service temperature (°C)
1750
1750
1750
1750
Typical values from the product data sheets. Properties for a specific order are confirmed in the quotation.
Inorganically bonded basic gunning material for tundish linings. Developed for continuous-casting service and control of phosphorus and carbon contamination.
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Tundish gunning mass
Property
HD-TPB85
HD-TPB70
HD-TPB60
HD-TPB50
MgO (%)
85
70
60
50
Modulus of rupture (MPa)200°C × 3h
3
3
2.5
2
Modulus of rupture (MPa)1550°C × 24h
3
3
3
3
Bulk density (g/cm³)200°C × 3h
2.2–2.5
2.2–2.4
2.0–2.3
2.0–2.1
Typical values from the product data sheets. Properties for a specific order are confirmed in the quotation.
Inorganically bonded basic dry mix for continuous-casting tundishes. Designed for quick installation, long service life and reduced phosphorus and carbon contamination.
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Basic tundish dry vibration mix
Property
HD-JZ80
HD-JZ70
HD-JZ60
HD-JZ50
MgO (%)
80
70
60
50
Modulus of rupture (MPa)200°C × 3h
3
3
2.5
2
Modulus of rupture (MPa)1550°C × 24h
3
3
3
3
Bulk density (g/cm³)200°C × 3h
2.2–2.5
2.2–2.4
2.0–2.3
2.0–2.2
Typical values from the product data sheets. Properties for a specific order are confirmed in the quotation.
Impact plates, flow stabilizers and slag weirs with high strength, erosion and corrosion resistance, and thermal-shock stability. The shapes stabilize molten-steel flow and encourage separation of nonmetallic inclusions.
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Tundish impact plates, flow stabilizers and slag weirs
Property
HD-ZW1Impact plate / flow stabilizer
HD-ZW2Impact plate / flow stabilizer
HD-DY1Slag weir
HD-DY2Slag weir
Al₂O₃ + MgO (%)
70
80
80
85
Bulk density (g/cm³)110°C × 24h
2.7
2.8
2.8
2.9
Modulus of rupture (MPa)110°C × 24h
7
8
8
10
Modulus of rupture (MPa)1500°C × 3h
10
12
12
12
Cold crushing strength (MPa)110°C × 24h
40
40
40
40
Cold crushing strength (MPa)1500°C × 3h
50
60
50
60
Typical values from the product data sheets. Properties for a specific order are confirmed in the quotation.
