soak time for 1080 during HT?

soakign is one of those things that withought a kiln is more luck till you do it a hole lot of times
get theose test blocks cut when youb get your steel and do the testing (like i told you last night)
your steel is cheap when you look at the big picture so jsut do it
the experince is worth way more then the foot or 2 of 1080 it takes
 
For hamon development I would soak 5-10 min but you must be able to control the temp and atmosphere.For tempering I start at 365 and do a brass rod test from there.I'll end up anywhere from 365 to 400 something.You will find there is a lot of fluctuation in tempering temps to reach the ideal edge that flexes and returns to true while not chipping out.
 
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