I've worked with 52100 and I would recommend that you start out tempering at 400 degrees. I austemper my 52100 blades at 430 degrees for three hours. If I can overide the stop on my eletric roaster, I plan to change that to quench to 425-430 degrees for a few seconds and then up quench it in oil to 510 degrees for an hour. Both ways should produce a mixture of martinsite and lower bainite, hopefully with an HRC of about 59-60 but the data on the second method is more solid. I have a data sheet from ASM International on order. It only cost $20 and, hopefully, will give more information than I have now without paying $255 for the Heat Treater's Guide.
Doug Lester
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