DIN 2391-81 SEAMLESS PRECISION STEEL TUBES

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pseamless-03 p2391-01zd02







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.
































Grade


Mfg. Process



Chemical composition



C


Si


Mn


P


S


Ni


Cr


Mo


Others


a


b


c


d


St30Si


S


0.10Max


0.30Max


÷0.55


0.040Max


0.040Max


-


-


-


-


a


b


c


d


St30A1


S


0.10Max


0.05Max


÷0.55


0.040Max


0.040Max


-


-


-


Al deoxydized


a


b


c


d


St35


S


0.17Max


0.35Max


∶0.40


0.050Max


0.050Max


-


-


-


-


a


b


c


d


St45


S


0.21Max


0.35Max


∶0.40


0.050Max


0.050Max


-


-


-


-


a


b


c


d


St52


S


0.22Max


0.55Max


∶1.60


0.050Max


0.050Max


-


-


-


-


a


b


c


d


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