A na-eji ihe mejupụtara Alloy 20 bols na 32.5% neckel, 19% Chromium, carbon, ọla kọpa, silicumbium na iron. Alloy 20 bụ Nickel-Chromium-molybbims nchara alloy etolite maka ngwa metụtara sulfuric acid. Ntugide ya corrosion na-ahụkwa ndị ọzọ na kemịkal, nri, ọgwụ ọgwụ na ụlọ ọrụ plastik. Alloy 20 na-egbochi na corrosion chloride, na ihe ọla kọpa ya na-echebe ya site na sulfuric acid. Alloy 20 abụghị ss, mana nickel alloy (ASTM).