A Amurka a cikin shekarun 1930, masana'antun kera kwal sun lura cewa wasu sinadarai na karafa sun samar da tsatsa wanda idan aka fallasa su, ba zai lalata karfen ba, amma zai kare shi.
Daukewar, earthy, orange-brown sheen na waɗannan gami da sauri ya zama sananne a tsakanin masu gine-gine kuma yana ci gaba har wa yau.
Corten karfe cakude ne na karfe da gami wanda ya bambanta gwargwadon darajar karfen corten. Karfe ne wanda aka kara da sinadarin phosphorus, jan karfe, chromium da nickel-molybdenum. Kafin bayyanar da abubuwan ba su da kyau, saman launin toka mai duhu zai iya nuna cewa an kawo samfurin da ba daidai ba, amma bayan lokaci zai samar da patina wanda .
Kamar yadda aka ambata a baya, Corten karfe karfe ne mai jure yanayin yanayi wanda kuma ana iya kiransa da ‘Atmospheric Corrosion Resistant Steel’, kuma shi ne abubuwan da suka hada da jan karfe da chromium wanda ke samar da wannan matakin juriya na yanayi.
Karfe na Corten ba wai kawai ya dace da kyau ba, amma kuma ya dace da aiki: mai dorewa, mai jure yanayi da zafi. Wannan zafi zai yi sauri ya narke naman nama kuma ya kulle a cikin miya. Kuma amfaninsa da ƙarfinsa ba su da tabbas. Saboda ƙarfin zafi mai zafi, ana iya amfani da karfen yanayi don barbecues na waje ko murhu.