Steel industry
In the ironmaking industry, refractory materials are mainly categorized into several types: those used for sintering, blast furnaces, tap-to-tap areas, torpedo cars, and molten iron pretreatment. Among these, the refractory materials paired with blast furnaces and sintering machines fall under the category of infrastructure-related materials, whereas those used in torpedo cars, tap-to-tap areas, and molten iron pretreatment are classified as consumable materials. For infrastructure kilns and furnaces, Kerryde primarily evaluates refractory materials based on their service life. As for these continuously consumed refractory materials, in addition to considering their service life, Kerryde also uses specific consumption rates to assess material quality and usage levels.
The slag generated in the ironmaking system is predominantly neutral or acidic and exhibits weak oxidizing properties. Based on the selection principle of materials with similar compositions and inertness to corrosive media, it is appropriate to use neutral refractory materials containing non-oxide components. In such areas, aluminum-silicon-based refractories containing silicon carbide, silicon nitride, and carbon are typically employed.
The refractory materials commonly used in the steelmaking industry fall into six major categories: magnesia/magnesia-calcium, chromomagnesia, siliceous, fireclay, high-alumina, and carbon-based. These refractory materials find wide-ranging applications, including linings for steelmaking furnaces and blast furnaces, insulating bricks for hot-air stoves in ironmaking, linings for ladles used to contain and transport molten metal and slag, furnace linings for heating steel billets in subsequent processing stages, as well as flue ducts that conduct hot gases and linings for the body of blast furnaces. Currently, even the tapping channels of small- and medium-sized blast furnaces are increasingly being lined with refractory materials that offer excellent resistance to erosion.
The core furnace type in the steelmaking process is the converter, whose primary function is to refine molten iron, scrap steel, and other raw materials into molten steel that meets specified chemical compositions while also endowing the molten steel with appropriate physicochemical and mechanical properties.
Refractory materials for the iron and steel industry
Refractory materials for steelmaking furnaces: Electric arc furnace roof—castables, precast blocks; LF furnace roof—castables, precast blocks.
Refractory Materials for Ladles & Tundishes: Dry-pressed Castables for Bottom of Electric Arc Furnaces, Dry-pressed Castables for Medium-Frequency Furnaces
Basic refractory materials for continuous casting: tundish lining castables, tundish shaped refractories, dry vibratory mixtures for intermediate ladles, and intermediate ladle coatings.
Continuous casting—long-life functional refractory materials: slag dams and impact pads; supporting equipment for continuous casting of billets, slabs, and thin slabs: shields, monolithic plugs, and immersion nozzles; supporting equipment for bloom continuous casting: zirconia metering nozzles.
Refractory materials for heating furnaces: refractory castables for working linings, plastic refractory materials, lightweight insulating castables; ladle and converter spray patching materials, precast chromic corundum blocks; refractory fiber products (felt, blankets, boards, modules).
Refractory materials for converters: magnesia-carbon bricks, threaded-hole blocks, and solid steel outlets; threaded-hole patching materials, magnesia-based patching materials, and converter refractories; converter tapping spout fillers, cold joint materials, and hot repair materials.
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