Summary. Most heat treaters make weekly quench oil additions to their quench tanks. Here are three things to consider regarding your quench: Photo credit: Heat Treat Today FNA 2018; Super Systems, Inc. All Rights reserved. Such stains typically require post quench and temper processing such as shot blasting. For example, air has an approximate H value of 0.01 cm-1 and water has an approximate H value of 0.4 cm-1 compared to oil with an approximate H value of ___ cm-1. Houghton Facts Slide Graphic: Follow graphic wave template for PowerPoint in Houghton Style Guide Other Graphics: Images of fluids, metalworking, people (culturally diverse), R&D, steel, technology, 1. 2. Be hyper-vigilant that no one attempts to recycle fluids that collect on the charge car. Keep water out of your oil quench. A few pounds of water at the bottom of an I quench trank can cause a major fire. Required flow velocity through the workload. These changes can have an impact on the microstructure, case depth, core hardness, and surface hardness on the quenched parts. The proper care of a quench is simple and straight forward. As the oil oxidizes it will begin to increase in viscosity until it reaches the point of forming an insoluble sludge. As the TAV increases so will the levels of oxidation, and in turn, the amount of sludge will also increase. Unfortunately, in many cases these reports are not well understood or, worse yet, filed to be used merely as ISO documents. In addition to comparing the cooling curve against the standard for the quench oil used, the Grossman H value should also be calculated and used as an indicator of cooling performance. Is it up to spec? 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 this reason, and also because water is much heavier than oil, it is imperative the oil be under agitation. Rapid cooling can cause cracking in the metal due to uneven stresses. Likewise, as the flash point decreases the amount of thermal cracking is increasing, which should reduce the viscosity and thereby increase the H value and the overall cooling speed of the quench oil. JIS K 2242 Silver probe 10mm x 30 mm. The Total Acid Value, or TAV, is a measure of the level of oxidation in a quench oil. The answer depends on a variety of factors such as the quench oil used and all of the variables associated with a furnace atmosphere. In this Heat Treat Today Technical Tuesday feature, Greg Steiger, senior key account manager at Idemitsu Lubricants America, shares how costly quench oil issues can be addressed through proper adherence to the CQI-9 quench oil testing protocols. An increase in flash point, along with no change in TAV, and an increase in viscosity could indicate a contamination issue between oils has occurred. The cooling rate of a particular oil can be varied by adjusting its initial pre-quench temperature too. As an oil is subjected to the high temperatures of a quenching operation, oxidation is a natural occurrence in the oil. Quenching is a vital part of the heat treating process in manufacturing. Utilizing a compliant CQI-9 analysis and the supplier provided operating parameters for the CQI-9 required tests is the first step in the proper care of a quench oil. Sludge reacts in an opposite manner of water. In a two-stage filter, the cheaper 50 micron filter will be replaced more often than the 25 micron filter in the second stage. For example, costs associated with part rejects, or rework and downstream costs for shot blasting, or third-party inspection are often the cause of poor quench oil maintenance. The category for this post is Quenching, and today’s tips–#8, #38, and #81–are from three different sources: Dan Herring,  “The Heat Treat Doctor®”, of The Herring Group; Combustion Innovations; and Super Systems, Inc. Dan Herring,  “The Heat Treat Doctor®”, of The Herring Group. Rikki Homma, K. Ichitani, M. Matsumoto, and G. Steiger, “Evaluation and Control Technique of Cooling Unevenness by Quenching Oil,” 2017 ASM Heat Treat Expo. Heat Treating — Choosing & Using Polymer Quenchants, Heat Treating: The How and Why of Quenching Metal Parts, Annealing , normalizing , quenching , martensitic transformation (1), Impact of SCAQMD Rule 1144 on Metalworking & Manufacturing Companies, Advantages & Disadvantages of Low-VOC Vegetable-Based Metalworking Fluids, Customer Code: Creating a Company Customers Love, Be A Great Product Leader (Amplify, Oct 2019), Trillion Dollar Coach Book (Bill Campbell). However, they differ in one basic item. The full range of management responsibilities, material handling, and equipment operations of the CQI-9 standard is beyond the scope of this paper. ltd.), Sr. R&D EXECUTIVE at Gulf Oil Corporation Limited. All of these standards measure the same basic property, the ability of an oil to reach martensite formation. Each quenchant, whether it is oil, water, aqueous solutions of polymer and water, or water-salt solutions, exhibits similar quenching characteristics. Finally, as the sludge increases, the cooling property of the quench oil should decline as indicated in the lower H value. If you have any questions, feel free to contact the expert who submitted the Tip or contact Heat Treat Today directly. You can change your ad preferences anytime. As you can see there is lots of different oils that you can use. This special edition is available in a digital format here. Simply adding enough fresh virgin oil to replace the oil that is being dragged out through normal operations should replenish the oxidation protection and quench speed to within the normal operating parameters.

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