321 stainless hlau txiv ntoo yog siv nyob rau ntau hom ntawv thov. 321 cov khoom siv yog cov hlau ruaj khov stainless hlau. Lub caij no, Stainless Hlau Unu S32100 hex bolts yog ib pawg Austenitic alloy, tib yam li alloy 304, tab sis muaj tsawg kawg 5 zaug ntau titanium dua carbon. Cov khoom muaj 17% npib chromium, 9% npib tsib xee thiab titanium thiab ruaj khov nrog carbon, manganese, nitrogen, phosphorus, phosphorus, sulfur thiab silicon.