Steel Plate/Sheet for Oven Mounting - What Grade to Use

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The discussion clarifies the distinction between steel plate and steel sheet, primarily based on thickness. Steel sheets are generally considered to be 1/8" or thinner, while plates are thicker, with 7 gauge steel measuring 3/16". For mounting bearings on an oven at 525°F, common stainless steel grades such as 302, 304, 316, and others are suitable, as they can withstand temperatures above 1000°F. A specific product mentioned is a 6" x 6" x 3/16" stainless steel plate available from McMaster Carr for approximately $20.
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What is the difference between steel plate and steel sheet.I need to buy a piece that is 7ga and 6"long/6" wide to mount 2 -4"bearings on that will be on top of a oven at 525degF.What grade steel to use and plate or sheet?
 
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The difference (between plate and sheet) is primarily related to the thickness, and is not of much importance either way. I think a sheet is usually 1/8" or thinner, but then I've heard of 1/4" plates also referred to as sheet metal. 7ga steel is 3/16". Most common stainless steels (302/304/316/317/410/420/430/440) can be used at working temperatures which are typically above 1000F.

McMaster Carr sells a 6" X 6" X 3/16" plate of stainless for $20 or thereabouts.

http://www.mcmaster.com/#stainless-steel-sheets/=5y3c56
 
I need to anneal 5052 aluminum for a home project. Google has given me mixed results on how to do this. Short version is that I'm doing some heavy forming on a piece of 5052-H32 and I'm running into issues with it work hardening. I've tried the Sharpie trick with a propane torch. But I'm not sure this is doing anything. I'm also seeing conflicting opinions whether to quench or air cool. So I'm looking for some expert opinions. (Oven heating is not an option due to size.) Thanks. edit: The...

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