Fused cast alpha alumina block ---DF-Reftek-A

DF-Reftek-A has been successfully used as skid rails as well as soaking zone bottom of heavy duty pusher-type furnaces reheating ingots due to its excellent abrasion resistance.  It is available in many shapes & sized, and is produced with and without casting voids.

Typical Application:

1.Walking beam furnace
2.Soaking pit furnace
3.Pusher furnace

Instruction:

1.The block is a rigid material by nature containing some glassy phase.Impact of the blocks against each other should be avoided during the process of moving on rollers and turning over the edges and corners.Otherwise it is easily to split off.
 2.The blocks shall be kept in a dry, covered place. Water absorbed by the shrinkage cavity and the open pores may cause blocks to shatter when heated up or to burst if exposed to frost.
 3.The temperature of fused cast rails or bottom should not change more quickly than 60 °C / hour,preferably 40-50 °C / hour
 4.There are three phases when heating up the furnaces int iron and steel industry
a.drying
b.pre-heating
c.heating to the operating temperature.
The length of each phase is subject to the quality of the refractory material, their expansion and the thickness of the furnace wall. Depending on the thickness of mortar or ramming mass, the prepared furnace bottom should be dried.
 5.When the temperature of 600 ℃ is reached, the heating up is continued with the main burners instead of the auxiliary ones at a constant rate of max. 60℃/h. It is imperative to avoid local overheatings. Fused cast materials should not be exposed to jet flame, and also the flow in of cold air should be avoid.
 6.When scale removal is necessary, the furnace should be cooled down below 800℃. Rapid cooling with compressed air or water spray may cause the fused cast blocks to shatter. Scraping slabs or hand tools are generally used for scaling.