During the twentieth century, the US industry successively adopted the open up hearth furnace, then The essential oxygen steelmaking process. Since the American business peaked inside the 1940s and 1950s, the US industry has shifted to compact mini-mills and specialty mills, employing iron and steel scrap as feedstock, as an https://www.kooapp.com/koo/guest_DENCMG/5525e6c9-9101-4225-895b-c857532c2260