Tempering??

B

Bladesboy

Joined
Feb 5, 2013
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Once the knife has been quenched it is time for tempering correct? Well, with 1075 steel (the steel i am currently using), how does one know the temperature at which to temper it? and for how long does it need to be tempered??
 
How hard do you want your knife? From what I've read, 2 x 1 Hr tempers at 350 F for @ 57-58 HRc. That is if it came out of the quench @ HRc 60.
 
According to the charts, if all was done right in HT it should quench at Rc62-63. Temper at 350 for Rc60, 400 for Rc59, and 450 for Rc58.
 
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I would temper it @ 350 and then test the blade. If the edge doesn't chip out then you're fine. If it chips out, re-temper @ 400 and re-test. Keep moving the tempering temp. up until the blade performs the way you want. Re-tempering does no harm and you can always raise the temp. to make it softer but if you go tto far you will have to re-harden. Good luck and let us know how it turns out.
 
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