Alloy 20 ma bolts amapangidwa kuchokera ku nichrome ndi kapangidwe ka 32.5% Nictumiya, kaboni, kaboni, Mkuwa, manganese, Siconi, Chitsulo. Alloy 20 ndi a Cromium-cromium-molybdenum osapanga dzimbiri cha chitsulo champhamvu chomwe chimapangidwa chifukwa chogwiritsa ntchito sulufuric acid. Kuzunzidwa kwake kumapezanso magwiridwe ena mu mankhwala, chakudya, mafakitale a mankhwala opangidwa ndi plastraceutical. Alloy 20 amakhazikitsa ndi chloride chiwonongeko, ndipo zokhuza zake zamkuwa zimaziteteza ku sulfuric acid. Alloy 20 sakhala SS, koma a Antoy (ASTM).