HT 1084 in oven

colu41

colu41

Joined
Dec 24, 2014
Messages
1,598
Usually I do 1084 with the good ole propane forge. But since I have an oven I want to use it.
So with 1084 in the oven. I put them in cold, and ramped it to 1500. This takes a good 10-15 minutes so, once it reaches temp, how long should I hold? Not sure how long it takes for the steel to reach oven temp.
In the forge, is easier to tell obviously from the color.
Any tips would be great.
 
First off, I don't have a ht oven but, from all the posts I have read on here, the ideal would be to heat the oven up, let it really stabilize for 20 mins or so, then put your blade in. Once it gets back up to temp, start your soak timer. For 1084, not much of a soak is needed. 2 mins is probably all you could ever need... Someone more experienced than me can probably tell you with more certainty than I. But I think im right... LOL!
 
Which oven are you using? 10-15 minutes to get to 1500˚ from cold? My Evenheat takes an hour or so to get that hot. How thick is the blade? 2-3 minutes is probably good for 1/8" stock. 5 minutes would be better for 1/4" thick blades.
 
i4Marc said:
Which oven are you using? 10-15 minutes to get to 1500˚ from cold? My Evenheat takes an hour or so to get that hot. How thick is the blade? 2-3 minutes is probably good for 1/8" stock. 5 minutes would be better for 1/4" thick blades.
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I built my oven. ID is only 6x6x15. So it heats up a bit quicker than the bigger guys. And it was more like 20 minutes once it got to temp. :rolleyes: And it wasn't a blade is was 2 pieces of .20" I am using to make a make shift file guide. I let it sit at 1500 for just under 5 minutes. Seems like it worked out ok.
Thanks

I'd also like to add, that when I'm HT'ing CPM154, from 1550 to 1950 it takes about 45 minutes. So from cold to 1950 it takes a little over an hour. I thought that seemed slow when I first starting running it, but, I've never had any experience with them so.
 
I built mine also and while I haven't timed it from cold to equalizing temp of 1400, I have timed it from 1400-1900 and it takes about 30 mins.
 
If this oven uses conventional electric heating coils, you're very likely overshooting your target temps at the steel through radiative energy. Your thermometer is reading the AIR temp inside the kiln, but your steel is catching both the heat of the atmosphere as well as the direct radiation from the heating elements. It's not uncommon for this to be a few hundred degrees hotter than the thermocouple may read. The reason to allow your kiln to ramp to temp and stabilize for a long time is to reduce this effect through having the entire interior of the kiln body close to target temp. Also, it's far better for ausgrain size to rapidly bring the steel to temp, like placing the steel in an already hot oven, rather than the slow ramp of the kiln.
I know the search feature on BF isn't it's strong suit, but there's quite a few posts discussing this. Many of us have gone as far as to make shrouds to deflect the radiative energy from directly 'beaming' at the steel.

Hope this helps!
 
Matthew Gregory said:
If this oven uses conventional electric heating coils, you're very likely overshooting your target temps at the steel through radiative energy. Your thermometer is reading the AIR temp inside the kiln, but your steel is catching both the heat of the atmosphere as well as the direct radiation from the heating elements. It's not uncommon for this to be a few hundred degrees hotter than the thermocouple may read. The reason to allow your kiln to ramp to temp and stabilize for a long time is to reduce this effect through having the entire interior of the kiln body close to target temp. Also, it's far better for ausgrain size to rapidly bring the steel to temp, like placing the steel in an already hot oven, rather than the slow ramp of the kiln.
I know the search feature on BF isn't it's strong suit, but there's quite a few posts discussing this. Many of us have gone as far as to make shrouds to deflect the radiative energy from directly 'beaming' at the steel.

Hope this helps!
Click to expand...

I didn't know about this. Thanks. I'll have to look into this some more.
 
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