Can I place a cast iron skillet on a gas grill and heat it to 600 degrees without destroying the cast iron?
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yes- heat away! Cast iron can be heated to wickedly hot temperatures..Those woks used at chinese restaurants are cast iron...they can take the heat & hold the heat for a really long time...just be sure not to submerge it in ice water when you're done.
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As long as it doesn't begin to glow red you are probably okay. But how are you going to get it that hot in the first place? That's a lot of BTUs!