I-Alloy 20 Bolts yenziwa nge-nichrome enokwakhiwa kwe-32.5% nickel, i-19% i-chromium, i-carbon, yethusi, i-molybdenum, manganese, silicon, i-columbium ne-iron. I-Alloy 20 iyi-nickel-chromium-molybdenum esingenacala athuthukiselwe izinhlelo ezibandakanya i-sulfuric acid. Ukumelana kwayo kokugqwala nakho kuthola okunye ukusetshenziswa kumakhemikhali, ukudla, amakhambi namapulasitiki. I-Alloy 20 imelana nokugqwala okukhohlisayo ne-chloride, futhi okuqukethwe yithusi kwayo kukuvikela ku-sulfuric acid. I-Alloy 20 akuyona i-SS, kepha i-nickel alloy (ASTM).