Nope Ni200 is ANSI rated for service up to 600F in boilers and pressure vessels.
fixed I totally misunderstood what you were trying to say.
There's theory, and there's practice. OCC
coils work fine at over 500F average. they just do. they don't "break down." the exposed legs don't reach 800F which would melt the insulators. ni200 only embrittles when dry burned or with real hot (glowing) legs. even if they did the only concern would be coil failure. but ni201 might be good to try.
You have absolutely no way of knowing what the temperature of the legs are in this situation or what is happening to them metallurgically.
Correct me if I'm wrong, but kanthal
coils graphitize in use due to high temperatures and eventually embrittle because of it.
Seriously? Are you just making stuff up as you go? A1 Kanthal doesn't oxidize until 2550F, which is it's max continuous operating temperature, and it doesn't melt until 2730F. I think it's safe to say that is no where near the operating temperature of an ecig coil, even one with hot legs. I'm not sure why you brought Kanthal up, but I'll take advantage of the opportunity to tell you you're wrong.
it might, but unless it does something, it doesn't matter, does it? the graphitization supposedly happens at 800F-1200F, and it can't be getting that hot or the insulators would start melting. but even if it did embrittle, if the coil doesn't break, it's moot ... which is sort of the point of prebuilt heads, you don't have to mess with them.
The 600 degree operating limit recommendation takes into account an appropriate margin that encompasses this differential ... and since the boards are programmed to run at 600 or below it's fine.
Are you kidding me? There is no "appropriate margin", and it's not a recommendation. 600F is the known temperature where things start to happen in Ni200. It's not some theory, it's scientific fact. And where did you get 800-1200? That's not accurate. Things do start to happen at 600 degrees, just not what I originally thought. Ni200 starts to "creep" at 600 degrees, which is a structural concern, but most likely is of no concern for our application except possibly explaining why coils seem to relax, and move around during use.
I have 3 heat treat furnaces in my shop that are used on a daily basis. We don't guess at an approximate temperature for anything, and the information supplied by the steel manufacturer is not a recommendation. We don't use temperatures provided by one steel manufacturer when working with the same material from another manufacturer. At 2,000F, 25 degrees either way can spell disaster with extremely expensive consequences.
Personally, I don't really care if my Ni200 corrodes a little. After spending most of my life in a Tool & Die shop, I literally have metal in my blood, so what's a little more going to hurt. I dry burn my coils regularly no matter which material they're made of. I'm betting it's still safer than smoking.
BUT, I would never recommend someone else do it, or talk like I know what I'm saying and downplay the possible health risks involved with any of the things we are dealing with. The goal of TC in vaping is to make it safer. If we have a product like these where the temperature is no where near what we think it should be, then how can anyone say it's safer? How can we assume what those hot legs are doing to our juice? How can we assume we even have hot legs at all?
