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 Roller-hearth furnaces

Roller-hearth furnace is a continous-action through-type furnace, the hearth of which consists of a great number of rollers moved by a special drive. These rollers are made of heat-resistant steel or are water-cooled. Roller-hearth furnaces are used for thermal treatment of metal products or for metal heating prior to applying the hot-rolling method. Rollers are the most critical elements of roller-hearth furnaces. Furnaces with the gas temperature of 800–1000 °C are equipped with uncooled rollers; with the temperature of 1.000–1.200 °C—rollers with a water-cooled drive shaft.

In a vast majority of cases, rollers are designed water-cooled; with a smooth roll made of heat-resistant chrome-nickel steel.

Our lining systems guarantee quick and easy installation, good heat insulation, and overall savings on power costs. The wide range of heat insulation materials allows us to perform successful repairs on roller furnaces.

Keralit specialists developed CERALIT heat insulation blocks for the lining of skid pipes. These blocks are characterized by installation simplicity and rapidness, as well as high inter-repair stability.

CERALIT insulation blocks have a good track record at a variety of iron and steel plants of Russia and the CIS countries. One may provide in-situ installation of the roller lining into pre-cast formwork using dense refractory concretes (castables).

Furnace wall lining is multi-layered:

  • Calcium silicate slab CERABOARD SILICATE 1000, CERABOARD SILICATE 1100.
  • Insulation bricks of such brands asFL 26-08, FL 24-06.
  • Working layer: gunned castable CERALIT GUN HK70070, CERALT GUN CR57009 or blown-in concrete CERALIT CAST HL60140.
  • Tamping of burner tunnels is provided with plastic mixture CERALIT PLAST BK70008.

The furnace roof lining is multi-layered:

  • Insulation layer: ceramic fiber CERAWOOL, insulation concrete CERALIT LWCAST VR32026.
  • Working layer: concrete CERALIT CAST HL60140, CERALIT LWCAST CR40059.

The lining of the exhaust gas system, recuperator, and chimney stack are made of various lightweight gunned castables, as well as insulation fire-clay grog concretes.