They were not always stainless. I have a black smokette, have had it for 12 years maybe, never and issue until a few months ago, think I am going to need a new stat. I love the think wish I had bought a larger one at the time.
There are many different grades (alloys) of "stainless steel." The trade-off is resistance to corrosion (i.e., "rust") vs hardness and durability. 300-series (austenitic) stainless is very corrosion resistant but softer compared to higher-series martensitic (400 - 600) which are harder and usually more heat resistant. I'd suspect CS goes more for strength, at least for hinge and door structures that need to be weldable. Maybe someone who knows CS design can chime in.
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