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.
Kwa mapulogalamu ogwiritsa ntchito pepala amafuna magiredi a Anoy omwe alibe zokwanira kuwonongeka. Kutengera ndi zikhalidwe 22%, ali ndi austetitic: microptuction microstructuctunce yomwe imapereka mphamvu zazikulu, kukana ndi kuchuluka kwa mtengo wake.
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).