The most efficient degassing techniques are carried out on metal which has been put into maximum temperature and when the temperature is falling
Undercertain conditions, the components of molten iron such as silicon, manganese,iron and in case of nodular iron, magnesium, are prone to form oxides and othernon-metallic compounds. These compounds may also be formed during desulphurising,refining and alloying treatments. The non-metallic compounds are insoluble iniron tending to remain suspended in the melt. They have the tendency of floatingtothesurfacewhen a number ofparticles havecoalesced.
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