masonred Posted January 24, 2021 Share Posted January 24, 2021 Using 1084 after quench tempered for 2 hours at 400 and blades turned blue. I didn't expect this and not sure if they are good or what to do next. Should I start over normalize, quench (harden) then temper? Of course this is new to me, only used salvaged springs and a sway bar before and that's just 3 knives. I've heard the term blue back but no experience with method or what it looks like. This is different correct? Quote Link to comment Share on other sites More sharing options...
Irondragon Forge ClayWorks Posted January 24, 2021 Share Posted January 24, 2021 Are you sure your oven is a true 400° F? Most oven thermostats can be off by quite a bit and require an accurate thermometer inside. Quote Link to comment Share on other sites More sharing options...
ThomasPowers Posted January 25, 2021 Share Posted January 25, 2021 Check the hardness and edge holding if its what you like or want then you are ok; Edges being thinner react more to the cycling of the oven. Quote Link to comment Share on other sites More sharing options...
rhitee93 Posted January 25, 2021 Share Posted January 25, 2021 If your oven temperature checks out OK, and you are sure that they didn't get over the setpoint as the oven was warming up, then you are probably OK. The oxide colors are not a great means of judging the temperature the steel reached. A lot can effect them other than the actual temperature. Quote Link to comment Share on other sites More sharing options...
D.IVO Posted February 12, 2021 Share Posted February 12, 2021 Oil residue will affect temper colors. Quote Link to comment Share on other sites More sharing options...
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