expanded to other applications, such as power plants, the foodindustry,petrochemicalplants,refineries,heatexchangers,marinestructuresandmedicalprostheses(4,5). Commercially available titanium is classified depending on its purity and elemental composition. The main classification for titanium is provided by the American Society forTestingandMaterials(ASTM).Thefirst4ASTMgradesof titanium are referred to as "commercially pure" and are not alloyed but only present differences in terms of contents of impurities, especially oxygen (6): grade 1 contains a maxi-mumof0.18% oxygen whilegrade4hasamaximumof0.40%.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.