Intsimbi engatyiwayo ayidleki lula, irusile okanye ingcoliswe ngamanzi njengentsimbi eqhelekileyo. Nangona kunjalo, ayibubo ubungqina obupheleleyo kwi-oxygen ephantsi, ityuwa ephezulu, okanye i-air-circulation engafanelekanga. Kukho amabanga ahlukeneyo kunye nokugqitywa komphezulu wensimbi engenasici ukuhambelana nokusingqongileyo i-alloy kufuneka inyamezele. Insimbi engenasici isetyenziselwa apho zombini iipropati zetsimbi kunye nokuxhatshazwa kwe-corrosion zifunekayo.

Intsimbi engatyiwayo yohluka kwintsimbi yekhabhoni ngobungakanani bechromium ekhoyo. I-carbon steel engakhuselekanga iyarusa ngokulula xa ibonakaliswe emoyeni kunye nokufuma. Le filimu ye-iron oxide (umhlwa) iyasebenza kwaye ikhawulezisa ukubola ngokwenza i-iron oxide engaphezulu[ingcaciso efunekayo]; kwaye, ngenxa yomthamo omkhulu we-iron oxide, oku kuthanda ukugqabhuka kunye nokuwa. Iintsimbi ezingenazintsimbi zinechromium eyaneleyo ukuze zenze ifilim yechromium oxide, ethintela ukubola komphezulu ongaphezulu ngokuthintela ukusasazwa kweoksijini kumphezulu wentsimbi kwaye ithintele ukubola ukuba unganwenweli kulwakhiwo lwangaphakathi lwesinyithi. Ukugqithiswa kwenzeka kuphela xa umlinganiselo wechromium uphezulu ngokwaneleyo kwaye ioksijini ikhona.