Just, no…
Everything else he’s done was fairly accurate. But this? Unless they are massively below sea level so the atmosphere is denser or this world has a high enough oxygen content in the air to give a normal human a migraine simply adding more air intakes isn’t enough. Coal under perfect circumstances burns at 2,372°F/1,300°C
You need use forced air to actually get the heat to the 2,800°F/1,538°C necessary to melt iron ore, plus he has the knowledge to know the result of that is going to be worthless for important machines because just melting the iron like that is going to result in a lot of air pockets that have to be forged out. It’s why despite manga claims Tamahagane is honestly horrible steel. Blast furnaces are easy to make if you have any sort of running water. Seriously they are so easy to make the first blast furnace on earth was created somewhere between 100 and 50 BC in Han Dynasty China- It was a basic furnace with a set of piston bellows driven by a waterwheel not unlike what they made in Dr. Stone. That’s literally the bare minimum needed to smelt iron ore into decent cast iron. Course while your melting down iron might as well skip straight to steel and toss in a handful of coal and a pinch of sand and you have good steel- for semi decent blade/spring steel you can get by on mixing by volume .6% coal, .1-.3% silicon (the sand), and the rest is iron. Heck modern spring steel isn’t much different just with some harder to source elements at the following ratios:
Carbon (C): 0.56-0.64%, Chromium (Cr): 0.70-0.90%, Manganese (Mn): 0.75-1.0%, Silicon (Si): 0.15-0.35%, Phosphorus (P): ≤ 0.035%, Sulfur (S): ≤ 0.04%
IsaEirias
Just, no…
Everything else he’s done was fairly accurate. But this? Unless they are massively below sea level so the atmosphere is denser or this world has a high enough oxygen content in the air to give a normal human a migraine simply adding more air intakes isn’t enough. Coal under perfect circumstances burns at 2,372°F/1,300°C
You need use forced air to actually get the heat to the 2,800°F/1,538°C necessary to melt iron ore, plus he has the knowledge to know the result of that is going to be worthless for important machines because just melting the iron like that is going to result in a lot of air pockets that have to be forged out. It’s why despite manga claims Tamahagane is honestly horrible steel. Blast furnaces are easy to make if you have any sort of running water. Seriously they are so easy to make the first blast furnace on earth was created somewhere between 100 and 50 BC in Han Dynasty China- It was a basic furnace with a set of piston bellows driven by a waterwheel not unlike what they made in Dr. Stone. That’s literally the bare minimum needed to smelt iron ore into decent cast iron. Course while your melting down iron might as well skip straight to steel and toss in a handful of coal and a pinch of sand and you have good steel- for semi decent blade/spring steel you can get by on mixing by volume .6% coal, .1-.3% silicon (the sand), and the rest is iron. Heck modern spring steel isn’t much different just with some harder to source elements at the following ratios:
Carbon (C): 0.56-0.64%, Chromium (Cr): 0.70-0.90%, Manganese (Mn): 0.75-1.0%, Silicon (Si): 0.15-0.35%, Phosphorus (P): ≤ 0.035%, Sulfur (S): ≤ 0.04%