nˈɑːnmətˈælɪk ɪŋklˈuːʒənz, ðə pɹˈɛzəns ʌvwˈɪtʃ dᵻfˈaɪnz pjˈʊɹɹᵻɾi ʌv stˈiːl, ɑːɹ klˈæsᵻfˌaɪd baɪ kˈɛmɪkəl ænd mˌɪnɚɹɐlˈɑːdʒɪkəl kˈɑːntɛnt, baɪ stəbˈɪlᵻɾi ænd baɪ ˈɔːɹɪdʒˌɪn.
Non-metallic inclusions, the presence of which defines purity of steel, are classified by chemical and mineralogical content, by stability and by origin.