Low Cement and Ultra-Low Cement Castables

Low and ultra-low cement castables feature small pore size, high density, good volume stability, high strength, and low water addition. They overcome the characteristic of significant strength reduction of ordinary castables at 800~1200℃; instead, their strength increases with rising temperature. They possess excellent thermal shock resistance, slag resistance, and corrosion resistance.

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Low Cement and Ultra-Low Cement Castables

Physical and Chemical Indicators

Item		Clay-based	High Alumina	Corundum-based
Al₂O₃ (%)		≥ 45	≥ 75	≥ 98
CaO (%)		＜ 1.8	＜ 1.5	＜ 1.0
Bulk Density (g/cm³)	110℃×24h	≥ 2.3	≥ 2.6	≥ 3.1
Bulk Density (g/cm³)	1350℃×3h	≥ 2.26	≥ 2.61	/
Bulk Density (g/cm³)	1550℃×3h	/	/	≥ 3.00
Cold Crushing Strength (MPa)	110℃×24h	≥ 70	≥ 75	≥ 85
Cold Crushing Strength (MPa)	1350℃×3h	≥ 85	≥ 90	/
Cold Crushing Strength (MPa)	1550℃×3h	/	/	≥ 100
Cold Modulus of Rupture (MPa)	110℃×24h	≥ 6	≥ 8	≥ 9
Cold Modulus of Rupture (MPa)	1350℃×3h	≥ 8	≥ 9	/
Cold Modulus of Rupture (MPa)	1550℃×3h	/	/	≥ 11
Permanent Linear Change (%)	1000℃×3h	-0.3	-0.2	-0.2
Permanent Linear Change (%)	1350℃×3h	± 0.3	± 0.5	/
Permanent Linear Change (%)	1550℃×3h	/	/	± 0.5
Max Operating Temperature (℃)		1450	1600	1800

Phosphate Bonded Castables

Compared with calcium aluminate cement bonded castables, phosphate bonded castables have better cold crushing strength and thermal shock resistance.

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Physical and Chemical Indicators

Item		Clay-based	High Alumina 1	High Alumina 2
Al₂O₃ (%)		≥ 45	≥ 60	≥ 75
Bulk Density (g/cm³) at 110℃×24h		≥ 2.23	≥ 2.34	≥ 2.60
Cold Crushing Strength (MPa)	110℃×24h	≥ 26	≥ 28	≥ 34
Cold Crushing Strength (MPa)	1400℃×3h	≥ 32	≥ 31	≥ 41
Thermal Shock Resistance (Cycles, 800℃ water cooling)		≥ 50	≥ 50	≥ 50

Alumina Silicon Carbide Carbon Castables

Alumina silicon carbide carbon castables feature strong resistance to molten iron and slag corrosion and erosion, good thermal shock resistance, and good oxidation resistance. They are easy to construct, can be baked quickly without bursting, do not adhere to iron slag during use, and have a long service life.

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Physical and Chemical Indicators

Item		Main Runner Slag Line	Main Runner Iron Line	Branch Iron Runner	Slag Runner
Al₂O₃ (%)		56~60	75~70	70~72	65~68
SiC (%)		15~30	12~15	12~15	15~18
Bulk Density (g/cm³)	110℃×24h	2.9~3.0	2.9~3.0	2.75~2.8	2.65~2.7
Bulk Density (g/cm³)	1450℃×3h	2.85~2.9	2.85~2.95	2.7~2.75	2.6~2.65
Cold Crushing Strength (MPa)	110℃×24h	35~40	35~40	30~35	25~30
Cold Crushing Strength (MPa)	1450℃×3h	50~60	45~65	35~40	35~40
Cold Modulus of Rupture (MPa)	110℃×24h	4~8	4.5~3.5	5~6	6~7
Cold Modulus of Rupture (MPa)	1450℃×3h	6~7	5.5~7.0	8~10	7~8
Hot Modulus of Rupture (MPa) at 1450℃×0.5h		＞ 1.5	＞ 2.5	＞ 3	＞ 1.5
Permanent Linear Change (%) at 1450℃×3h		+(0.1~0.2)	+(0.1~0.3)	+(0.1~0.2)	+(0.1~0.2)

Wear-Resistant Refractory Castables

Wear-resistant refractory castables have good volume stability, high strength, high wear resistance, good thermal shock resistance, and good corrosion resistance. They exhibit good resistance to cracking and spalling during use.

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$Wear-Resistant Refractory Castables$

Physical and Chemical Indicators

Item		NM-1	NM-2	NM-3	NM-4
Al₂O₃ (%)		≥ 70	≥ 75	≥ 80	≥ 85
Bulk Density (g/cm³) at 110℃×24h		≥ 2.6	≥ 2.75	≥ 2.8	≥ 2.9
Cold Crushing Strength (MPa)	110℃×24h	≥ 60	≥ 65	≥ 70	≥ 75
Cold Crushing Strength (MPa)	1400℃×3h	≥ 90	≥ 95	≥ 105	≥ 110
Cold Modulus of Rupture (MPa)	110℃×24h	≥ 8.5	≥ 9	≥ 10	≥ 11
Cold Modulus of Rupture (MPa)	1400℃×3h	≥ 13	≥ 14	≥ 15	≥ 16
Cold Abrasion Amount (cm³)		＜ 9.6	＜ 8.5	＜ 7.3	＜ 6
Refractoriness Under Load (0.2MPa, ℃)		＞ 1450	＞ 1490	＞ 1530	＞ 1560
Thermal Shock Resistance (Cycles, 900℃ water cooling)		＞ 20	＞ 20	＞ 20	＞ 20
Max Operating Temperature (℃)		1550	1550	1600	1600
Permanent Linear Change (%)		＜ -0.3	＜ -0.3	＜ -0.2	＜ -0.2

Steel Fiber Reinforced Castables

Steel fiber reinforced castables feature high strength, good toughness, good thermal shock resistance, and strong anti-spalling and wear resistance. They are suitable for areas with large temperature gradients and areas prone to spalling and damage.

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Physical and Chemical Indicators

Item		GNM60	GNM70	GNM75	GNM80	GNM90
Al₂O₃ (%)		≥ 60	≥ 70	≥ 75	≥ 80	≥ 90
Bulk Density (g/cm³) at 110℃×24h		2.3~2.4	2.4~2.5	2.5~2.6	2.6~2.8	2.9~3.1
Linear Change Rate (%) at 1100℃×3h		± 0.5	± 0.5	± 0.3	± 0.3	± 0.3
Cold Modulus of Rupture (MPa)	110℃×24h	≥ 6	≥ 7	≥ 8	≥ 9	≥ 11
Cold Modulus of Rupture (MPa)	1100℃×3h	≥ 8	≥ 10	≥ 11	≥ 11	≥ 11
Cold Crushing Strength (MPa)	110℃×24h	≥ 35	≥ 45	≥ 50	≥ 55	≥ 70
Cold Crushing Strength (MPa)	1100℃×3h	≥ 50	≥ 60	≥ 70	≥ 80	≥ 100

Lightweight Insulating Castables

Lightweight insulating castables have the advantages of low thermal conductivity, excellent heat insulation performance, energy saving and consumption reduction, and convenient construction. They can reduce the thermal energy consumption of industrial kilns and reduce the weight of the furnace lining.

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Physical and Chemical Indicators

Item		LW0.6	LW0.8	LW1.0	LW1.1	LW1.3
Bulk Density (g/cm³) at 110℃×24h		0.6~0.7	0.8~0.9	1.0~1.1	1.1~1.2	1.3~1.4
Modulus of Rupture (MPa)	110℃×24h	≥ 0.5	≥ 1.0	≥ 1.5	≥ 2	≥ 2.5
Modulus of Rupture (MPa)	1100℃×3h	≥ 0.5	≥ 1.0	≥ 1.0	≥ 2	≥ 2.5
Crushing Strength (MPa)	110℃×24h	≥ 2.0	≥ 2.5	≥ 5	≥ 6.5	≥ 7.5
Crushing Strength (MPa)	1100℃×3h	≥ 1.5	≥ 2.0	≥ 3	≥ 5.5	≥ 10
Thermal Conductivity (W/(m·K)) at 350℃±25℃		≤ 0.2	≤ 0.25	≤ 0.28	≤ 0.35	≤ 0.4
Max Operating Temperature (℃)		1000	1100	1150	1200	1250

Alumina Magnesia Castables

Alumina magnesia castables are mainly hydrated bonded and coagulated bonded, used for the lining of ladles, tundishes, etc. They have high resistance to slag penetration and corrosion, good overall structural anti-spalling properties, and good volume stability.

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Physical and Chemical Indicators

Item		AMC70	AMC80	AMC85	AMC95
Al₂O₃ + MgO (%)		≥ 70	≥ 80	≥ 85	≥ 95
Bulk Density (g/cm³)		≥ 2.6	≥ 2.8	≥ 2.85	≥ 2.95
Cold Crushing Strength (MPa)	110℃×24h	≥ 20
Cold Crushing Strength (MPa)	1000℃×3h	≥ 30
Cold Crushing Strength (MPa)	Test Temp × 3h	≥ 50 (1500℃)	≥ 50 (1550℃)	≥ 60 (1550℃)	≥ 60 (1600℃)
Permanent Linear Change (%) (℃×3h)		-0.5~+1.5 (1500℃)	-0.5~+1.8 (1550℃)	-0.2~+1.8 (1550℃)	0~+1.0 (1600℃)

Related Products

Phosphate-Bonded High Alumina Bricks

Based on their characteristics, phosphate-bonded high alumina bricks are mainly classified into phosphate-bonded high alumina bricks, phosphate-bonded wear-resistant bricks, and special phosphate bricks.

Mullite Bricks

Mullite bricks possess excellent high-temperature performance, high strength, high refractoriness under load, superior thermal shock resistance, and good chemical stability. They exhibit good corrosion resistance against acidic and low-alkaline slags.

Corundum Bricks

Corundum bricks feature high refractoriness under load and excellent chemical stability. They have strong resistance to acidic or alkaline slags, liquid metals, and molten glass, along with a dense structure.

Corundum Mullite Bricks

Corundum mullite bricks are characterized by high-temperature resistance, erosion resistance, chemical corrosion resistance, high cold crushing strength, high refractoriness under load, and good thermal shock stability.

Sillimanite Bricks

Sillimanite bricks feature a low thermal expansion rate, excellent resistance to corrosion from metallurgical slag and various molten glasses, and good high-temperature wear resistance. They have good high-temperature thermal stability, minimal pollution to molten glass, and high refractoriness under load.