I Make Steel for Guan Yu: I Melt Down the Green Dragon Crescent Blade from the Start

He transmigrates into the son-in-law of Guan Yu, and from the start he's faced with a broken blade, battered armor, an army out of food, and Xu Huang and Lü Meng attacking from both sides. A Baosteel engineer by trade, he takes up a hammer and improves the blast furnace, forging steel blades that can slice through armor! Watch as I use modern metallurgy to rewrite the Martial Sage's fate against all odds!