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DIN 2391-81 SEAMLESS PRECISION STEEL TUBES (DIN2391-81) 1.Field of application 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.
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