In the twentieth century, the US industry successively adopted the open hearth furnace, then The essential oxygen steelmaking process. Considering that the American industry peaked within the 1940s and 1950s, the US industry has shifted to small mini-mills and specialty mills, utilizing iron and metal scrap as feedstock, rather than https://www.kooapp.com/koo/guest_DENCMG/5525e6c9-9101-4225-895b-c857532c2260