The concepts of heating and boiling black oxide are not so bad when you think about what is going on in a tank. Water boils at 212 F at sea level. To get it to boil at a higher temp you can put salt into it. If you put the right amount of blackening salts into the water (6#/gal) it will boil at 285F.
Boiling is different than just heating something to a set temperature. There must be extra heat from steam, gas flame or electric to get to temperature of 285F temperature, and then cause the phase change from liquid water to steam in the tank and boil. Once at the boil if there is too much heat it can boil over. So, adjust the heat by turning down the flame for a constant steady rolling boil, if the tank is boiling too violently. If it is barely boiling you may need to turn the flame up slightly. If you would like more info on the heating and temperature control of a black oxide tank in your business, please contact info@hubbardhall.com
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