Good Intensity Magnesia Carbon Refractory Bricks

Good Intensity Magnesia Carbon Refractory Bricks

Magnesia-carbon (MgO–C) bricks are un-fired refractories composed of mainly magnesia aggregates and fines, graphite flake and antioxidants additives. They possess much better corrosion resistance against steel-making slags as well as improved thermal shock/spalling resistance compared to fired carbon-free counterparts, thus have been and are still being used extensively to line key steel-making vessels such as converters and steel ladles.

Thermal spalling is generally identified as one of the main mechanisms responsible for the damage of a refractory during service. As mentioned above, compared to the fired carbon-free counterparts, unfired MgO–C bricks have much better thermal shock/spalling resistance. Nevertheless, upon subjection to cyclic thermal changes at steel-making temperatures, some cracks due to large thermal stress could still be generated and subsequently propagated, resulting in some damages on the refractories. Such damage usually is not instantaneous but develops progressively with time. To prevent this kind of damage so as to improve service lives of refractories and steel-making vessels, cracks generation and propagation in the refractories need to be investigated, along with quantitative evaluation on the affecting factors underpinning. Considering this, it is important to find out the relationship between thermal cycling and refractories failures based on the principle of fracture mechanics. Although thermal shock resistance itself has been qualitatively studied by many researchers, little work has been done on quantitative analysis of crack propagation in a refractory.

Magnesia carbon bricks

Brand	MgO （%）≥	C （%）≥	Apparent porosity A.P（%）≤	Bulk density B.D(g/cm3)≥	Compressive strength at room temperature C.C.S MPa≥
MT-10B	77	10	4	3	45
MT-12B	75	12	4	2.95	40
MT-10A	80	10	3.5	3.05	45
MT-12A	77	12	3.5	3	40
MT-14A	75	14	3	2.95	40
MT-16A	72	16	3	2.95	35

Alumina magnesia carbon bricks

Brand	MgO （%）≥	Al2O3 （%）≥	C （%）≥	Apparent porosity A.P（%）≤	Bulk density B.D(g/cm3)≥	Compressive strength at room temperature C.C.S MPa≥
AMT-60	16	57	12	4	2.92	50
AMT-65	17	62	10	4	2.95	50

Type	Magnesia Aluminum Carbon Brick				Magnesia calcium carbon brick
Index grade	MAC60	MAC70	MAC74		MGT5	MGT2	MGT13
MgO（%）≥	55	68	71		70	75	70
Al2O3（%）≥	23	8	6		-	-	-
C（%）≥	8	10	10		5	2	8
CaO（%）≥	-	-	-		-	-	-
B.D(g/cm3) ≥	3	2.9	3		2.9	2.85	3
Apparent porosity AP（%）≤	6	5	5		6	7	5
Compressive strength at room temperature CCS（Mpa）≥	30	35	40		30	30	35

Main applications:

Magnesia-carbon bricks have a wide range of uses, and can be used in key parts of thermal equipment such as steel-making converters, electric arc furnaces, ladles, and out-of-furnace refining furnaces. The aluminum-magnesium-carbon bricks made of high-quality bauxite clinker, fused corundum, and fused magnesia have low thermal conductivity, good thermal insulation, and appropriate residual expansion.

They are used for ladle, lower wall, bottom and free Good materials for the department. The performance of magnesia-aluminum-carbon bricks is between that of magnesia-carbon bricks and aluminum-magnesia-carbon bricks. Magnesia-calcium carbon bricks are made of high-quality magnesia, dolomite sand and synthetic magnesia dolomite sand as raw materials, and anhydrous resin as a binder. Good slag resistance, more stable under high temperature vacuum, and can clean molten steel. It is suitable for VOD furnace, AOD furnace and LF furnace of external scouring device.

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Product Categories : Magnesia Carbon Brick