Magnesia Carbon Refractories for Steel Ladle

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Magnesia Carbon Refractories for Steel Ladle, mainly refer to magnesia carbon bricks. The carbon content of mag carbon bricks depends on the conditions of use. Currently, the carbon content of magnesia carbon bricks conventionally produced in China is 10%, 14% and 18%. Magnesia carbon bricks with special carbon content need to be specially produced.

RS Magnesia Carbon Bricks Manufacturer
RS Magnesia Carbon Bricks Manufacturer

Application of magnesia carbon refractory bricks

Magnesia carbon refractory bricks are mainly used as lining materials for steel-making converters, electric furnaces, refining furnaces and ladle. It is one of the currently used magnesium composite refractory materials with a large amount. The promotion and application of magnesia-carbon bricks has made the life of steel-making industrial furnaces multiply increase, and some even increase tens of times. For example, before the converter lining in China used magnesia-carbon bricks, the lining life was only a few hundred furnaces. After the promotion of the use of magnesia-carbon bricks, especially after the converter slag splashing furnace protection technology was also applied in the late 1990s, the service life of the converter lining increased to tens of thousands of furnaces. For example, a Chinese steelmaking plant’s 1 # converter lining uses magnesia carbon bricks, combined with slag splashing furnace protection technology, in March 2003, a world record of 30368 furnace age was created.

magnesia carbon bricks
magnesia carbon bricks

Magnesia Carbon Refractories for Steel Ladle

Magnesia Carbon Bricks

Magnesia-carbon bricks have excellent corrosion resistance and anti-stripping properties. Magnesia carbon bricks are mainly used in the slag line on the ladle. Other refractory materials (castables, unfired bricks, etc.) are used instead of the slag line. This can not only obtain a higher service life, but also reduce the cost of refractory materials. The physical and chemical indexes of magnesia carbon bricks used in a steel plant’s ladle slag line are MgO 77.4%, C 16.75%, apparent porosity 3.1%, bulk density 2.90g / cm3, normal temperature compressive strength 38.6MPa. There are also many other successful cases of using magnesium-carbon bricks for reference.

  1. In September 1981, a steel-making plant was the first to use magnesia-carbon bricks in a 70t ladle slag line. The service life is 50 times, and the high aluminum bricks at the non-slag line are seriously damaged and are disabled.
  2. A 300t ladle slag line of a steel plant started to use MT-14A magnesium carbon brick in July 1989. The life of the slag line is maintained above 100 times.
  3. A 90tLF refining ladle slag line of a steel plant uses magnesium-carbon bricks with a carbon content of about 16%. The slag line life is 95 times.
  4. In some steel mills, the ladle is lined with full magnesium carbon brick. For example, the electric furnace of a steel factory uses 60tLF-VD refining ladle and full magnesium carbon brick lining, with an average life of 47 times and a maximum of 57 times.

Low carbon magnesium carbon brick

Magnesia carbon bricks are used in the ladle slag line, which has the problem of molten steel carbon increase. In recent years, some steel mills have cooperated with refractory manufacturers to develop low carbon steel slag line magnesia carbon bricks.

A 300t ladle slag line of a steel plant has tried low carbon magnesium carbon bricks with carbon content less than 7% and less than 5%. The service life can reach about 110 times, which is equivalent to ordinary magnesia carbon bricks, and can basically meet the requirements of 300t ladle. In addition, the ladle slag line of another steel plant also uses low-carbon cladding bricks with a carbon content of less than 5%, which has a good effect.

magnesia carbon bricks for sale
magnesia carbon bricks for sale

Magnesia Carbon Bricks Properties

As is known to all, magnesia-carbon bricks, as a composite refractory material, effectively utilize magnesia’s strong resistance to slag erosion, carbon’s high thermal conductivity and low expansion, compensating for the biggest shortcomings of poor resistance to magnesia. Its main features are: good high temperature resistance, strong slag resistance, good thermal shock resistance, and low high temperature creep.

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