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Molten salt is salt which is solid at standard temperature and pressure (STP) but enters the liquid phase due to elevated temperature. A salt that is normally liquid even at STP is usually called a room temperature ionic liquid, although technically molten salts are a class of ionic liquids.
The Basics of Molten Salt Quenchants. Taken from Heat Treating Progress magazine, August 2003 edition. Molten salt is an ideal medium for interrupted quenching processes. Nitrate-based salt, the most widely used, blankets the quench temperature range of 150 to 595 degrees C (300 to 1100 degrees F).