S31803 bụ usoro na - adịghị mma (enweghị ego) maka ndozi nke Duplex ahụ. E mepụtara usoro azụmaahịa site na ọtụtụ ndị otu azụmaahịa na 1970 iji belata oge na-asụ otu alloy otu ihe dị iche iche, na nke ọzọ. Otu akwụkwọ ozi na-anọchi anya ya na ọnụọgụ ise sochirinụ, ebe akwụkwọ ozi na-anọchi anya usoro, I.e. s maka igwe anaghị agba nchara.
N'ihi na akwụkwọ igwe mpịa ngwa chọrọ akara niile na-enweghị ike na-enweghị nguzogide nguzogide nguzogide. Dabere na ọdịnaya Chromium 22%, ha nwere obodo ukwu: micronitic nke na-enye ike ka ukwuu, nguzogide na arụmọrụ-arụmọrụ.
S31803 (ASTM F51) A na-ekwupụta nkọwa nke ukwuu site na S32205 (1.4462, ASTM F60). Nke a na-egosi na ha ga-emeli ihe mgbochi Allonoon, ekele maka mmepe nke usoro aid na-enye ohere maka ịchịkwa njikọta. Na mgbakwunye, ọ na-ekwe ka emetụta nkọ na-enweghị ọkwa kama ịbụ naanị ịnọ dị ka ihe ndabere. Ya mere, kacha elu na-eme akara use na-achọ ime ka ọdịnaya nke Chromium (cr), molybdemum (molybdenum (m) na nitrogen (n).