The article dwells on the linguistic and extra-linguistic factors of phraseologization in scientific and technical texts. The phraseologism functions in technical texts are designated. The terminologization phenomenon of phraseologisms is identified. Interaction principles between phraseologism and its context are formulated. The main directions of contextualization in terms of discourse are determined. Idiomatic contexts are considered as mythological discourse components. Due to that point, the technique of analyzing and translating phraseologisms is defined. In the given article the terms phraseologism and idiom are considered as fully interchangeable. As nouns the difference between phrase and collocation is that phrase is a short written or spoken expression while collocation is (uncountable) the grouping or juxtaposition of things, especially words or sounds.