![]() The blue line is the normal time vs temperature curve, and the orange line is the “instantaneous cooling rate” at each position. The inconel probe test is similar but the probe can measure the temperature of itself during quenching to generate more information about the quenching process rather than just generating a time in seconds. This seems to be because the nickel ball test is outdated and has mostly been replaced by the inconel probe test. I found a study on 1045 steel where they found canola to quench more rapidly than motor oil so I am going to stick with canola as my “cheap” quenching option to test.ĭespite quite a few studies that looked at canola oil I did not find any nickel ball measurements. Knifemakers looking for oils to use that are cheaper than those available commercially most commonly use canola from the grocery store. If you have a supplier that regularly sells 5 gallon containers of Houghton oils those are worth looking at as well.Ĭanola, Motor Oil, and the Inconel Probe Test There are other products available, of course, notably Houghton makes a range of oils at different speeds. So the ratings of the oils are not quite as simple as I might have liked. Jantz lists the oil as “14-16 seconds” on their sheet, but the datasheet from Citgo lists the oil as 16.1 seconds, which looks oddly specific when the other products have ranges. Of course giving them the McMaster-Carr order number just gave an error in the system. The buckets say Reladyne oil but contacting Reladyne led to nothing the person I spoke to on the phone didn’t seem to have any information on the products whatsoever and kept asking me for an order number. In fact, for some reason the datasheet calls Quenchall a 26 second oil instead. I asked McMaster-Carr for more information on the oils but the sheet they sent me ( hosted here) doesn’t have any more specific information on the nickel ball test ranges. Quenchfast and Quenchall are offered by McMaster-Carr as “11 second” (Quenchfast) and “28 second” (Quenchall) oils. I bought my oils from Maxim but since then DuBois has an easy online store available for these oils. Parks AAA is a medium-fast oil, taking 9-11 seconds with the nickel ball test. Parks 50 is a 7-9 second oil, clearly in the “fast oil” category. Parks 50 and AAA are quite commonly known oils among knifemakers. A general ranking of different quenchants is found below: At that point the test is stopped and the time taken. The nickel ball is held on a string and a magnet placed outside of the beaker so that when the nickel ball becomes magnetic it is attracted to the side of the beaker. Nickel reaches the Curie point at 670☏ at which point it is attracted to a magnet. A 12 mm nickel ball is heated to 1620☏ and then quenched into 200 ml of oil. One common rating method for quench oils is the quenchometer “nickel ball” test.
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