Monel 400 yog npib tsib xee-tooj liab, tsuas yog muaj ntawm tsib xee (kwv yees li 63%), thiab muaj ib qho me me ntawm cov hlau, manganese, carbon thiab silicon. Qhov no alloy tau dav siv hauv ntau thaj chaw muaj kev lag luam vim nws cov khoom lag luam zoo heev thiab cov khoom siv tshuab.