Andalusite Bricks

Andalusite bricks have a low impurity content and exhibit a very small decrease in high-temperature strength. They feature excellent resistance to rapid cooling and heating, high mechanical strength, strong thermal shock resistance, strong slag resistance, and high refractoriness under load. Additionally, they possess extremely high chemical stability and strong resistance to chemical corrosion. They are widely used in torpedo cars, steel ladles, hot blast stoves, and carbon baking furnaces.

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Physical and Chemical Indicators

Item	RH155	RH150	RH145	RH140	RH135
Al₂O₃ (%)	≥ 69	≥ 65	≥ 61	≥ 57	≥ 53
Fe₂O₃ (%)	≤ 1.0	≤ 1.0	≤ 1.2	≤ 1.2	≤ 1.5
TiO₂ (%)	≤ 0.5	≤ 0.5	≤ 0.5	≤ 0.6	≤ 0.6
Apparent Porosity (%)	≤ 20	≤ 20	≤ 20	≤ 20	≤ 20
Bulk Density (g/cm³)	2.55~2.70	2.50~2.65	2.45~2.60	2.40~2.55	2.35~2.50
Cold Crushing Strength (MPa)	≥ 55	≥ 55	≥ 50	≥ 50	≥ 40
Refractoriness Under Load (0.2MPa, ℃)	≥ 1700	≥ 1700	≥ 1650	≥ 1600	≥ 1520
Permanent Linear Change (%)	± 0.2 (1500℃×2h)	± 0.2 (1500℃×2h)	± 0.2 (1500℃×2h)	± 0.2 (1450℃×2h)	± 0.2 (1450℃×2h)
Creep Rate (0.2MPa, 0~50h, %)	≤ 0.8 (1550℃)	≤ 0.8 (1500℃)	≤ 0.8 (1450℃)	≤ 0.8 (1400℃)	≤ 0.8 (1350℃)

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