Li-bolts tse 20 li etsoa nchrome ka sebopeho sa 32.5% nickel, 19% chromium, molybese, li-molybium le tšepe. Alloy 20 ke ainy-chromium-slybdenum steel allowe o ile a tsoela pele ho etsa likopo tse amang sesupo sa sulfuric. Ho hanyetsa ha eona ea Corrosance ho boetse ho fumana ts'ebeliso e meng ka k'hemilekeng, lijo, indasteri ea meriana. Onyetsana ea 20 o hanela ho omella le chorrode corrosion, 'me litaba tsa eona tsa koporo li li sireletsa ho silfuric acid. Alloy 20 ha se SS, empa Nickel Alloy (asst).