Manganese is not magnesium, but it is equally astonishingly "light" - here "light" refers to its low-key and efficient presence in steel. Put the manganese carbonate powder into the leaching tank, dance a "waltz" with sulfuric acid, and then purify, electrolyze, and peel off. A silver gray, shiny and rough electrolytic manganese sheet is born. There are four grades from DJMnA to DJMnD, with a melting point of 1244 ℃, making it the "monosodium glutamate" in special steel smelting - only 60 g per ton of steel is needed, but it can simultaneously improve strength, toughness, and corrosion resistance by one level. If electrolytic manganese flakes are detached and enter the alloy ring, they will have a different CP composition from iron, silicon, and carbon. High carbon manganese iron is like a tough guy, mainly focusing on wear-resistant steel and track steel; Low carbon manganese iron transforms into a warm-hearted man, tightening the grain size and enhancing the ductility of stainless steel. Silicon manganese alloy is a golden partner: the ratio of Mn ≈ 60% and Si ≈ 14% results in a melting point of only 1270 ℃ for the deoxidation product MnSiO ∝, with large particles that are prone to floating. The steelmaking burn rate drops from 46% to 29%, saving 3-5 yuan per ton of steel cost. Don't underestimate these few dollars, a group with an annual output of millions of tons can earn an extra sports car in a year. Raise the perspective even higher, and the manganese based alloy is dancing with the "dual carbon". After the mainstream steel mills in China changed the blast furnace converter process to electric furnace continuous casting, the manganese recovery rate increased by 6% and dust emissions decreased by 40%. The more advanced "hydrogen metallurgy" test line has attempted to reduce manganese ore with hydrogen gas, with only water vapor as a byproduct. It can be imagined that in the future, manganese will wear a green coat and continue to protect the "hardcore" romance of steel.