All tool steels are made for a definite quenching medium - air, oil or water. In liquid baths, sufficient quenching fluid must be used so that the liquid will not get too hot and be ineffective. Generally speaking, the tool should be removed from the quench when it is approximately 150 degrees Fahrenheit and then be allowed to cool to room temperature after which it should be placed in the tempering oven. Approximately one gallon of oil or water should be provided for every pound of steel quenched per hour.