quick question on tempering

[lanchie76]

hey guys

just a quick one, i've finished shaping and sanding my first knife and am getting ready for my first harding attempt. i have read all the stickys and a xxxx of a lot of posts on this forum.
the metal is/or was a old jackhammer tip of unknown metal type that i had to anneal to work and even then was pretty hard compared to a RR spike (the only carbon steel that i have really worked before).
now i know i have to heat to non-magnetic (should be about cherry red) and my first quench im trying oil and that doesn't work i'll try water

im planning to temper at 170c for 2 hours and depending on the hardness another for 1-2hrs at 200c.
now heres my question do i quench after tempering? i have read that people when tempering with Differential tempering they quench to stop the heat radiating. is that the same with normal tempering that i want to stop the effects of the heat after it?

thanks for reading
Ben
ps here a picture for you to look over too :)

[Steve Sells]

with most our blade steels it does not matter much if they are air cooled or fast cooled to get tempering temp to room temp.
There may be some that do matter, but I aint heard of them yet :)

[lanchie76]

thanks Steve

if you haven't heard of any then i think im pretty safe i think i might just let air cool

Ben