I te United States i te tekau tau atu i 1930, ka kite nga kaihanga kaata waro i hangaia e etahi koranu rino he paparanga waikura, ina pa ana ki enei mea, e kore e pirau te rino, engari ka tiakina.
Ko te kanapa mauroa, te oneone, te karaka-parauri o enei koranu ka tino rongonui i waenga i nga kaitoi, ka mau tonu ki tenei ra.
Ko te maitai o Corten he ranunga o te maitai me te koranu e rereke ana i runga i te karaehe o te maitai corten. He rino me te ūkuikui, parahi, chromium me te nickel-molybdenum. I mua i te rongonga ki nga huānga, he ahua pouri te mata hina pouri, kua he te tukunga o te hua, engari ka roa te wa ka puta he patina e .
Ka rite ki te korero i mua ake nei, ko te maitai o Corten he rino aukati huarere ka taea hoki te kiia ko te 'Atmospheric Corrosion Resistant Steel', a ko ana mea whakauru o te parahi me te chromium e whakarato ana i tenei taumata o te aukati hau.
Ko te maitai o Corten ehara i te mea ataahua anake, engari he pai ano hoki te mahi: he roa, he huarere, he wera. Ma tenei wera ka tere te whakamaroke i te paopao ka mau ki roto i te gravy.A, ko te whaihua me te roa kaore e taea te patai.