What causes the cracking in the furnace lining?Cold shockHigh melting temperatureLow pouring temperatureThermal shock

The cracking in the furnace lining can be caused by several factors, including cold shock, high melting temperature, low pouring temperature, and thermal shock. Let's break down each of these causes step by step:

1. Cold shock: When the furnace lining is exposed to sudden and extreme temperature changes, it can lead to cracking. This is known as cold shock. For example, if a hot furnace is suddenly cooled down rapidly, the thermal stress can cause the lining to crack.

2. High melting temperature: Furnace linings are designed to withstand high temperatures. However, if the temperature inside the furnace exceeds the melting point of the lining material, it can cause the lining to crack. This can happen if the furnace is operated at higher temperatures than it is designed for.

3. Low pouring temperature: During the process of pouring molten material into the furnace, if the temperature of the material is too low, it can cause thermal stress on the lining. This can lead to cracking as the lining tries to accommodate the temperature difference between the material and the furnace.

4. Thermal shock: Thermal shock occurs when there is a rapid and significant temperature difference between different parts of the furnace lining. This can happen, for example, if one part of the lining is exposed to high temperatures while another part is exposed to cold temperatures. The differential expansion and contraction can cause cracking in the lining.

In summary, the cracking in the furnace lining can be caused by cold shock, high melting temperature, low pouring temperature, and thermal shock. Understanding these causes can help in preventing and addressing the issue of cracking in furnace linings.