steeliksi

Steeliksi is not a standard Finnish word. In ordinary Finnish, the noun for the metal is teräs, and the grammatical form used to express change into that material is the translative teräksiksi. The form “steeliksi” does not appear in normative Finnish and is generally considered nonstandard, a calque from English or a creative spelling rather than an accepted word.

In Finnish grammar, the translative case with the suffix -ksi expresses becoming or changing into something. With the stem teräs, the correct form is teräksiksi. For example, the sentence Materiaali muuttuu teräksiksi means “The material becomes steel.” The spelling “steeliksi” would be viewed as incorrect in formal writing and most dictionaries would not recognize it as a separate word.

Possible usages and notes: you may encounter “steeliksi” in brand names, fictional or stylistic texts, or in discussions by learners who imitate Finnish morphology without following standard orthography. In normal communication, however, it is safer to use teräksiksi or to rephrase to avoid the issue altogether. Effective alternatives include describing the material as made of steel or using teräksestä valmistettu for “made of steel.”

See also: teräs, translative case, Finnish grammar, word formation in Finnish.