S31803 ndiye njira yolumikizirana yolumikizidwa (yopanda tanthauzo) ya chitsulo choyambirira. Dongosolo la Unili lidapangidwa ndi magulu ambiri amalonda m'ma 1970 kuti muchepetse chisokonezo pomwe alloyo yemwe yemweyo adatchedwa zinthu zosiyanasiyana, komanso mosemphanitsa. Chitsulo chilichonse chimayimiridwa ndi kalata yotsatiridwa ndi manambala asanu, pomwe kalatayo ikuyimira zitsulo, i.I. s ya chitsulo chosapanga dzimbiri.
Zolinga za mafakitale, m'mapaipi apakati, nthawi zambiri timafunikira kusintha njira yoperekera; Sungani madzi oyenda (mafuta ndi mpweya, madzi, matope); Tseki lotseguka kapena pafupi, motero, kuti mukwaniritse izi, zotchinga zachitsulo zidzagwiritsidwa ntchito.
The S31803 (ASTM F51) imathamangitsidwa kwambiri ndi S32205 (1.4462, Astm F60). Izi zikuwonetsa chikhumbo chawo chokulitsa zachilengedwe za Aloy Kuphatikiza apo, zimalola kukopa gawo la nayitrogeni osati kungokhala ngati chinthu choyambira. Therefore, the highest performing duplex grades seek to maximize the content of chromium (Cr), molybdenum (Mo) and nitrogen (N).