Refractory Technology
Magnesite chrome bricks are used in the

Roof lining of basic open hearth & other basic furnaces
Reheating furnaces
Soaking pits
All of these

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Refractory Technology
Natural silica

All of these
Is not stable at high temperature
Mainly contains quartz
Transforms to other allotropic forms i.e tridymite and cristoballite involving very high volume changes

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