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Refractories business

What is a refractory material?

A material that can withstand the heat of one thousand and several hundreds degrees Celsius

Refractory = Fire-resistant Materials such as iron, steel, cement, and glass used for things all around us are produced through manufacturing processes at high temperatures ranging from hundreds of degrees to one thousand and several hundreds degrees Celsius.
In furnaces for making iron/steel, glass, etc., the channels through which the molten iron/steel, or glass pass and pans receiving them must be made of materials that can withstand high heat as well as chemical erosion.

Example of facility


The temperature of molten iron/steel, is
about 1,600 to 1,800°C!
Material that can withstand the heat
is indispensable!!

Now, material that can withstand such high heat is “refractory.” This material is resistant to fire and it is generally said that the heat resistance level is about 800 to 2,000°C.

Support High-quality Iron/steel-making

Refractories produced by Krosaki Harima

Refractories are indispensable for industries involving high-temperature manufacturing processes, but those manufactured by Krosaki Harima are mainly for iron/steel-making and feature very high heat resistance of about 1,400 to 1,700°C as required by the iron/steel-making industry and the severe environment where they are used. There are other properties required, and the research and development and the manufacturing of refractories call for advanced technological know-how.

Required Properties

・Resistance to chemical erosion
・Resistance to heavy flow of molten metal
・Resistance to drastic heat changes, etc.

In addition, the shape and type required differ depending on the application, and therefore many types of refractories exist under the classification of “refractory materials for iron/steel-making.” In terms of shape, for example, they can be roughly divided into the following two types.
・Shaped refractories
・Unshaped refractories* such as powders and pastes

*Unshaped refractories contribute to the reduction of CO2 emissions because there is
 no process of firing and hardening and the manufacturing ratio of these materials
 is thus steadily increasing.

Variety of refractories

Unshaped refractories

Shaped refractories

Applications:All channels for molten iron/steel

The following figure shows processes for making iron and steel. Since hot molten iron/steel passes through the facility until the iron/steel is hardened, refractories are required at all places with which the molten iron/steel is brought into contact. Though the facility appears to be made of iron/steel only from the outside, the facility can only withstand high heat when refractories are used inside.


Total solution only Krosaki Harima can provide

In addition to the manufacturing and sales of refractories, Krosaki Harima provides various services.
・Refractory engineering of kiln equipment for iron and steel making
 (lining design, manufacturing, sales, installation work, maintenance, etc.)
・Engineering of refractory peripheral equipment for iron and steel making
 (apparatus design, manufacturing, installation work, maintenance, etc.)
・Engineering of various industrial furnaces
 (design, manufacturing, installation work, maintenance, etc.)
We will provide the best solution for your needs by making the most, not only of our refractories, but also of our technologies.

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