duck wrote:I worked in a fab shop for years we used all type of metal, the most workable metals are hot rolled 1050 series. Cold rolled has a better finish but not as workable and weldable as mild steel. Stainless has it's place but not for stove construction, we had a guy that wanted us to build small beach charcoal grills and demanded 1/4 stainless. We told him they'd warp with heat he claimed he had metalurgy experience, we made one for a trial, the remaining 19 were out of mild steel boiler plate.
Hot rolled sheet steel is not good for working in a pressbreak. Cold rold and hot rolled is the term for how they produce the sheet steel or stock you can still have cold rolled mild steel.
I remaid the stiffeners/heat shields in my WM out of 12 Gauge cold rolled mild steel. this is the most common alloy you will find in sheet metal shops. Hot rolled is harder to clean usually because of mill scale and more difficult to break in the break press without possible cracking . Less forgiving . But take it to the sheet metal shop and them do what they do as professionals.
The front shield is the old one out of the stock that has seen over 50 years of fire. The ones behind it are the new ones and have been in the stove the past week. And the stove is burning coal now . They are taking the heat cycles perfect. No warps . From 50 degrees to 900 degrees they have been .
And If this stove has refractory inside the sheet metal which I'm sure it does then the sheet metal will last virtually forever if well taken care of. Also think about having the new sheet metal parts you have made enameled .
I still work in a shop as a professional fabricator, welder , and backsmith. My previous company I was a sheet metal mechanic (not HVAC either) and before that a machinist / metals technology guy for the USAF .
And all of us here can give you as much suggestion and opinions as we have but if you trust this shop and their abilities just take it to them and let them do their thing.
Btw cre8tionist where are you located?