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Casting speed directly determines the casting time, and every fused cast azs block has its own best casting time. Unreasonable casting time can cause many defects in the casting.

High casting speed
If the casting speed of fused cast azs block is too fast, the liquid flows become wide which bring a great impact on the casting mold of fused cast azs block, then part of casting mold is broken through or melted which can make the this part of mold risen up. In addition, when the wide liquid flow is casted into mold, some air is may brought into casting mold and rising to the top cover of the mold rapidly. Meanwhile, liquid touched top cover has already formed thin shell, so when air rises to the top cover that so-called shell is formed. What is more, it is easy to form air bubbles inside the mold when air is brought in mold. Except for the air, wide liquid flows caused by high casting speed may also brings the raw material which is in furnace mouth into molten liquid of fused cast azs block.

Low casting speed
If the casting speed of fused cast azs block is too slow, defects such as corner loose, knot, sand inclusion and Insufficient casting will be produced. Low casting speed leads to thin liquid flows, when the thin liquid flow is casted into the mold of fused cast azs block, solidified to a small ball and move to the side corner which will result in loose of edge angle. If the first poured liquid flow has solidified into a thin shell which will inward contraction, then poured liquid flows will get into the gaps between the thin shell and the mold which form scar on the surface of fused cast azs block. Meanwhile, if the liquid flows are too thin, before reaching the side corner the liquid flow will be solidify which will lead to Insufficient casting. In addition, low casting speed will also lead to long time casting which means that mold baking time will be increased, that the mold cover is easy peeling off into the molten liquid and cause sand inclusion.

Zhengzhou Sunrise Refractory Co., Ltd. is mainly engaged in the research and development of refractory products. Sunrise can provide excellent fused cast AZS block which has passed the ISO international certified. Over 30 years producing and marketing experience, with reliable quality, competitive price and prompt delivery, Sunrise has established long-term business and cooperation relationship with many customers in different countries and regions. For any further information, Contact us, we will do our best to help you.

source link: http://fusedcastazs.com/fused-cast-azs-block/