Quoting Removed, click Modern View to seeStainless steel can be either straight chrome (400 series) or chrome nickel (300 series). There are some other categories, but they are more expensive and less available. The straight chrome grades have slightly lower thermal expansion than carbon steels and the thermal conductivity is a little better than CrNi and lower than carbon steels.
409 stainless is used for exhaust systems. It has only 11% Cr and it will rust some, so it isn't decorative, but it does last in exhaust systems. Any polished stainless will have low emissivity, but 409 won't stay pretty. As for conductivity, I can see where it would make more of a difference in a thick section, but for sheet, I have my doubts. Doubts and facts are not always closely related.
A good high temperature coating like the ones used for exhaust manifolds should protect the metal and increase thermal radiation. It should help with either plain carbon or 409 stainless steel.
The only reason I can think of for medium carbon vs low or high carbon steel is that the thermal conductivity around 0.5% C is slightly higher than the higher or lower carbon grades. It may be the peak of a rounded curve, but not that much different from lower and higher carbon plain carbon steel. Whatever you can get locally should suffice. I wouldn't be surprised to find that any plain carbon steel will eventually settle out at about the same carbon content. An oxidizing flame will remove carbon and a reducing flame will increase it. It may eventually depend on the temperature and atmosphere inside the stove.
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