Boilerplate?

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I've looked around and don't know just where to post this question.  I want to make a griddle for my two burner outdoor large camp stove, a griddle about 14"x26". I looked at a griddle in a store that was made of 3/16" steel (mild, I suppose) with two smaller 3/32" or 1/16" pieces attached underneath (I suppose for heat propagation) at the burner sites that cost $100.  I think I can make a better one for less.  I've been told to look for some boilerplate as it won't warp as mild steel will (the store versions were well reeinforced with flat stock welded around the edges to control warpage).  I called some steel suppliers about this and was told they couldn't respond to my question unless I had a specification (ASTM, I suppose) for the boilerplate steel I sought.  I've looked in this forum, other forums and online generally and have not found what I need.  Do you have a suggestion for the most efficient specification for 3/16' boilerplate for this purpose?  Or do you suggest I forget the boilerplate idea?Thanks
Reply:I really don't think there will be much difference, buckling is caused by heat on one side and the same heat will be there regardless of plate specs. As far as I can see the coefficient of linear exp. is the same for mild steel (59,000lb) and for boilerplate so buckling should be similar
Reply:Clive 's got it right. If you go to 1/4" plate it won't warp as badly but the thing will be heavy, around 27 or 28 pounds just for the plate. I've made several comals for the tortilla cookers out of 1/4", usually about 12" in diameter, and they stay flat.
Reply:Thanks for your replies.  I guess I'll just build a griddle out of mild steel and model it after the ones I see at the local store.  I've got some scrap 1/8" aluminum that I'm considering riveting to the bottom to spread the heat of the burners over the underside.
Reply:Unless you have some pretty thick aluminum and a way to get and keep the aluminum and steel in -intimate- contact (friction or explosive welding/bonding), skip the idea of 1/8 aluminum under the steel plate.  The benefits versus the efforts probably aren't worth it.IMHO.
Reply:'boiler plate' is a variety of materials, but A/SA516 is about the most common in low carbon.For this application, it makes no difference. Use A36 or whatever. There will be no significant difference in warpage in service. To control warpage, use the 1/4" recommended, or 3/8 if you feel the need, and weld an edge around it for stiffening. It will likely still pucker a bit with time. You can control this to a point by welding reinforcers across the bottom, But I wouldn't worry about it. Your burner will need to distribute the heat fairly well to avoid hot and cold spots.I agree that trying to use aluminum to spread heat won't help much if any. Most likely outcome: melted/burned aluminum all over the burners.