Greg Steiger is the senior key account manager of Idemitsu Lubricants America for quench products. Submitted by Combustion Innovations. Poorly maintained quench oil can cost heat treaters in many areas. In today’s Technical Tuesday, we continue an intermittent series of posts drawn from the 101 tips. High molecular weight sludge or excessive water can create surface hardness issues. Everyone knows water in a quench oil can be have catastrophic safety and performance consequences. The graph below for Idemitsu Daphne Hi Temp A helps illustrate this point. Because of this difference, it is important to note that cooling curves and cooling rates between the methods should not be compared. Summary. Acid number vs kinematic viscosity for Daphne Hi Temp A. Having test parameters that work in conjunction with each other is only beneficial if sample frequencies are often enough. Without getting too technical, the cooling rate of quenching oil is directly related to its viscosity. A steel’s thermal conductivity does not typically change according to alloy composition or temperature. The answer depends on a variety of factors such as the quench oil used and all of the variables associated with a furnace atmosphere. Sludge reacts in an opposite manner of water. For instance, it is well known that a heavily oxidized oil may create surface stains that must be shot blasted to remove. Figure #4. Just as the level of carburization is influenced by the carbon potential of a carburizing atmosphere, the cooling speed of the oil influences microstructure formation and microstructure composition along with mechanical properties such as hardness as well as tensile and yield strength. The amount of oxygen in a quench oil cannot be measured without a sophisticated laboratory analysis. He is also a member of ASM International. All Rights reserved. In addition to the potential uneven cooling issues high water may create, a high level of water can also influence the rate of oxidation in an oil. For controlled cooling, use quenching oil instead of water to minimize cracking and distortion after heat treating parts and tools. In severe cases of oxidation staining may result. It's nonstaining and chlorine and sulfur free. The full range of management responsibilities, material handling, and equipment operations of the CQI-9 standard is beyond the scope of this paper. Such stains typically require post quench and temper processing such as shot blasting. If left unchecked, the decrease in flash point could result in a higher risk of fire.

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