steel tubes for precision applications technical delivery conditions partwelded cold sized tubes; German version EN PDF. Content Provider. Precision steel pipe, welded, DIN EN, E +N (normalized), inspection certificate acc. 1,  · This document specifies the technical delivery conditions for welded cold sized steel tubes of circular cross section with specified outside diameter D ≤,7 mm Precision steel pipe DIN EN (DIN /-2) Welded cold sized precision steel pipes. Find out how to get ANSI Membe