I asked the guys on the metal working forum what kind of material to use for a high heat environment. I chose 304 stainless .25 x .5 inch flat bar based on their recommendations. Now I'm ready to weld. I have welded alot of 304 sheet but none lives in this kind of environment. ( the grill gets to about a 1000 degrees) Is there any kind of special pre or post weld precautions I need to make because of the high heat environment?
Here is the original thread:
Wow that is not the metal I would choose for a sustained 1000 degF.
304L would be a LOT better, but 321 is the best economical choice. Haselloys and Inconels are designed for that kind of heat.I suspect your 304 is going to start rusting. The sustained heat is going to cause Chromium Carbide formation which will depress the rust resistance of the base metal.
The grate that is being replaced was cast iron. (see original thread) That would rust too, no? It will see alot of grease just from cooking wouldn't that halt the rust? My original thought was 321, but the guys on the other forum said 304 would be fine.
I don't think thore are any pre or post weld treatments that will affect how long the grate lasts. If you have not already bought the welding rod, I think that you might do better using something other than 304L rod. Not an expert here, but I think a rod with higher chrome and nickle would ensure that the welds don't fail before the rest of the grate. May not be necessary.
Dan
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