High heat Stainless commercial grill grate

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joebass - 30 Mar 2005 23:17 GMT

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:
http://groups-beta.google.com/group/rec.crafts.metalworking/browse_thread/thread
/68ecf47742e6d044/d5ff7e63072d7710

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Ernie Leimkuhler - 31 Mar 2005 06:16 GMT

> 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
[quoted text clipped - 8 lines]
> http://groups-beta.google.com/group/rec.crafts.metalworking/browse_thread/thre
> ad/68ecf47742e6d044/d5ff7e63072d7710

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.

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joebass - 31 Mar 2005 19:08 GMT

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.

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dcaster@krl.org - 01 Apr 2005 17:46 GMT

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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Craft Forum / Wood/Metal / Welding / April 2005

High heat Stainless commercial grill grate