Brian Dougherty Posted January 20, 2021 Share Posted January 20, 2021 I will need to heat treat some non-knife related parts in a couple of weeks that are machined from 440C. (I agreed to help out a student team at the college I work for so this is a shoe-string budget job) I've never worked with 440C, but according to the datasheets I found it can be air hardened with forced air, or interrupted quenched in oil. I had planned to wrap the parts up in foil to keep the scale minimized. This makes me a little concerned about air hardening since the foil will slow things down a bit. However, I think what the TTT curve is saying is that I have over 6 minutes to get below 1200F. Am I reading that correctly? (PDF attached) These parts are all lathe turned from 1/2" diameter stock, and only a couple inches long. It would seem to me that even wrapped in foil, such small parts will easily cool from 1900F to 1200F in less than 6 minutes without the stress of oil quenching. Their target hardness is around 54C, so I don't need to eek out every bit of performance with this. Would anyone care to weigh in on air as opposed to oil in this case? Thanks in advance... Data Sheet 440c.pdf -Brian Link to comment Share on other sites More sharing options...
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