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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%.

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