Ntau cov khoom zoo pom nyob rau hauv tib yam khoom tsuas yog vim yog cov ntawv zoo dua. Cov no yog lub zog siab tensile, nto seem raug, hloov tau thiab ruaj, tiv taus cov kev tsim kho hnyav, muaj zog tsim thiab corrosion tsis kam. Kuj, kev nyuaj siab corrosion cracking, crevice corrosion cracking, oxidation \ / pitting corrosion ua rau nws haum rau ntau yam kev siv.