'Supper Hot' Wood Stove

blackfish

I want to build a metal wood stove that has much higher thermal conductivity than steel.
I want to find a metal/alloy that will not melt with a roaring wood fire, is available in 'plate'
for riviting or welding, will not emit toxic fumes and hopefully affordable? There are so many metal/alloys out there that I am overwhelmed. Help me find the best metal! *Thanks - KB