In the game, click the Help "?" up top. On the left you will see a bunch of "?" symbols, some of which are market Product. Click "Products (S-Z)" and you can see all the information on Steel:
It is made in a factory
It does not sell in any retail stores (so only to players)
It gets reserached at a Chemical RC
and it uses:
2 kg Iron Ore
5 kg Coal
.5 kg Chemicals
200 kWh power
Steel
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