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I use cast iron, a lot. But I've got a problem, whenever I do something that requires high heat or really anything over medium (which is somewhere around 450-500F on my stove according to my IR thermometer), the seasoning burns off my pan! There's smoke and all that and then by the end of the cooking, large parts (mostly in the middle outward where its hottest) of the pan don't have any seasoning left and I can see the bare cast iron. Above 600-700F, I definitely expect it but it happens just above/around 500F for me.

Am I doing something wrong? Is this normal? Is there a way to season the pan that keeps this from happening? I've just been using canola oil.

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What are you cooking? –  TFD Feb 15 '12 at 21:24
    
I'll turn it up to do tortillas or pizza or such that helps to have really high temps. –  rfusca Feb 15 '12 at 21:29

4 Answers 4

up vote 3 down vote accepted

No, this isn't normal. A little flaking, perhaps, when you go over 600°F, but 500°F shouldn't do anything. It shouldn't even smoke.

Something is wrong with the seasoning on your pan. From the fact that its smoking, I'd guess its not sufficiently baked on. Alternatively, maybe the pan wasn't clean when you applied it.

If its just not baked on, I'd remove all the flaking bits (with some harsh scrubbing, sand paper even), clean it thoroughly, then bring it to around 300°F (stovetop or oven). This will make sure it is completely dry. Spread a thin layer of high-iodine value oil (flax seed is great, soy is pretty good and cheap and easy to find: look for the bottle that just says vegetable oil and check the ingredients, it's probably soy). Spreading is easy with a paper towel.

Next, toss into a very hot oven, 400–500, smoking is expected. Bake for 90 minutes, then turn the oven off. Allow pan to cool with oven. Once its cool, touch it. If its at all tacky, put it back in the oven, and bake for another hour (once again, allowing to cool with oven). It should be a shiny black at this point, and not at all tacky.

You can repeat the process to add more layers. Two should be reasonably non-stick to start cooking on.

If it still peels off after this, you're probably going to need to strip the seasoning and re-season the pan, after stripping it to bare metal. See What's the best way to season a cast iron skillet? to season it from bare metal.

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Hmmm... I'll give a shot. I've already set off the smoke alarm once tonight, so I'll have to wait a few days ;) –  rfusca Feb 15 '12 at 7:38
    
@rfusca If you have a grill that you can control the heat on to get it into that 400–500-ish range, you could use that. –  derobert Feb 15 '12 at 7:42
    
Seasoning a pan takes minutes on the high heat setting of your stove top, not hours in the oven. This is totally over the top –  TFD Feb 15 '12 at 10:30
    
@TFD see sherylcanter.com/wordpress/2010/01/… and sherylcanter.com/wordpress/2010/02/… ; the long hot oven works better (especially since OP has bare iron showing, also, the quick stovetop seasoning is not working for him, since he has it keep flaking off). –  derobert Feb 15 '12 at 11:19
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Because we don't know if the problem is in the seasoning itself, or on the interface between seasoning and pan, I would combine multiple cleaning methods, probably even strip the old seasoning completely, before reseasoning. I would go for scrubbing - lye bath - acid - weaker base - lots of (filtered) water - stovetop drying. Lots of work, but should ensure shiny metal to bind with the seasoning. –  rumtscho Feb 15 '12 at 14:58

Hmm..Normal? well it happens to me regularly as well, but I'm not sure I am good standard for 'normal'. What I always do is after cleaning my cast iron (by de-glazing as discussed here: Can deglazing a cast iron skillet remove the seasoning?) is to rub down the pan with a light coat of olive oil and then return that pan to the now cooling element on the stove. I doubt this is the same as the layers of hydrocarbons that are normally thought of as 'seasoning' but I never have a problem with food sticking to my cast iron.

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My problem isn't related to food sticking or how to re-oil the pan after it happens - but really to if I can keep it from happening. –  rfusca Feb 15 '12 at 7:14

You are using the wrong sort of oil

Use an oil with a strong and dry polymerisation effect, e.g. Flax (Linseed) oil, tung, even soy oil

Canola, olive etc do not form very hard polymers, and often remain tacky

If you have a pan with layers of flaky soft oil, just leave it on the high heat until a metal scraper can easily remove the old layers. Let it cool, and then season like this

Scrub your pan clean, wipe on a decent layer of oil over the cooking surfaces with a paper towel, place pan on stove top on hottest element, and heat until oil just stops smoking, remove from heat

If you keep it on the heat you will break down the oil polymer layer, and have to start again

This should take only a few minutes, not hours

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Canola doesn't remain tacky if you bake it long enough. Stovetop, possibly it does. –  derobert Feb 15 '12 at 11:21
    
@derobert it's polymer never goes very hard, hence seasoning is normally done with other oils –  TFD Feb 15 '12 at 12:57
    
agreed, flax seed and soy are better choices. Flax is apparently amazing, Cooks Illustrated tried that procedure I linked to in my other comment (on my answer) and found it survives the dishwasher (!). –  derobert Feb 15 '12 at 13:40

For starters, I think this very normal. My pans also start looking like "bare cast iron" in the middle when I heat them up really hot. They will smoke too if I had any oil on them from previous use.

It has never been a problem however. I just do a quick seasoning of oil on that piping hot pan, give it a minute to smoke down & set in & it's ready to go. Not a problem with food sticking or anything... Not even eggs or fish.

I have tried (repeated times) Sheryl Cantor's Flax Seed Oil seasoning method - Fail. The oil is a "dry oil" alright. So dry, it ends up flaking off almost immediately. And, I have tried so, so many methods and different types of fats/oils without any miraculous success. I stopped worrying about it and just heated it up on my stove, seasoned it off for a minute and cooked with it. That has been the best method so far.

I'm beginning to think it is really the heat over time that seasons the pan and not so much the oil.

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it's a mix of the oil + heat ... you're baking the oil into a plastic coating on the pan ... but you want build up a thick enough layer. –  Joe Jul 22 at 23:06

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