Anyone have trouble with 321 stainless heat treat foil?

Kentucky

Kentucky

Joined
Dec 13, 2008
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First yea I know, 309 is what we use too before you say anything..:thumbup: Problem is we had 309 on order and for some reason the USPS decided that we don't need it:rolleyes: and its been setting in limbo somewhere without moving towards us for some odd reason.Yea tracking # hasn't updated since it was picked up by the usps.Well I can get access to the 2000° 321 foil fast but Im concerned that it might not hold up with 1975° aust temps with 30 minute hold times...
Have you tried the 321 or would it just be a waste of time? Im afraid Im just asking for it to be welded on the blade..
 
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What is the temp rating on the 309?
Kentucky said:
First yea I know, 309 is what we use too before you say anything..:thumbup: Problem is we had 309 on order and for some reason the USPS decided that we don't need it:rolleyes: and its been setting in limbo somewhere without moving towards us for some odd reason.Yea tracking # hasn't updated since it was picked up by the usps.Well I can get access to the 2000° 321 foil fast but Im concerned that it might not hold up with 1975° aust temps with 30 minute hold times...
Have you tried the 321 or would it just be a waste of time? Im afraid Im just asking for it to be welded on the blade..
Click to expand...
 
I can tell you that the regular "low temp foil" will hold together for ONE welding pass. The second pass, it convenient flakes right off of the billet. ;)
 
309 and 321 foil temp rating depends on who makes it.
Generally 309 can handle up to 2300, some to 2400F
321 can usually handle up to 1800F to 1950F (again, depending on who makes it) but prefers tool steel range in the 1500's.
I probably wouldn't use any 321 at 1975F since it gets pretty crunchy at that range.
 
I have been using this at 1950 for 30-45 mins. I haven't had any problems and have done maybe 8 batches.
 
Try "The Duffy Company" that I use in my machine shop. Also to prevent welding at high temps coat the steel with liquid milk of magnesia, any flavor, and let dry. Steel must be clean or you will have adhesion problems. The milk of magnesia contains a little sodium hypochlorite, also known as Chlorox, and will cause a little rust so heat treat soon after drying. This is not a miracle but it works for me when hardening CPM 10V parts. Not my origional idea. Good luck.
 
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