Basic Info.

Product Description

Cold drawn seamless precision steel tubes din 2391 nbk in grade st-35 / 37.4, for automobile industry and oleohydraulic and pneumatic systems. this standard applies to seamless precision steel tubes; and, in compliance with iso/dis 3304, those tube dimensions have een selectied from the range of manufactura le tu e dimensions which are mainly used as design elements if tubes having the tolerances and are produced according to the technical conditions of deivery as specified in this standard are to e used as pipelines, then the dimensions specified in din 2448 may from time to time be used. these tubes must be ordered according to quality grade c. executive tube standard : din2391 cold drawn or cold rolled precision seamless steel tube product particular communication: 1) size:4 - 127 mm (od) x 0.89 - 15mm (wt) ; 2) tight tolerance, smooth surface, uniform mechanical property(mechanical properties equilibrium) ; 3) heat treatment: bk, bks, gbk, nbk,stress relief, normalizing, spheroidize