Sandborn is a town in Vigo Township, Knox County, Indiana, United States. The population was 415 at the 2010 census. It is the home of the annual Black Creek Festival. Its only business is AKB oil, once known as the Blue Jay Junction.
Large furnaces melt the iron and stay at temperatures ranging 2,600 to 2,800 degrees Fahrenheit. Computerized systems constantly monitor temperature. As the iron travels down the molding line, the temperature gradually decreases from about 2,600 to 1,200 degrees. As the castings cool, they enter a shakeout process in which the molds are shaken off and the sand is recycled for reuse. When castings get below about 140 degrees, they are cleaned and finished.
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).