Material Standard and Size Tolerances for Precision Steel Pipe

　　Precision pipe is the carbon, alloy or stainless steel pipe with high precision sizes. Usually it has been made through hot rolling or cold drawn (cold rolling) processes. So precision pipe is a kind of seamless pipe.

　　Precision steel pipe material standard

　　International standard for precision pipe is DIN 2391, which is applied with European standard.

　　As a matter of fact, more steel pipe standard could applied for the precision pipe. Includes DIN2445, EN10305, DIN1630, DIN1629, ASTM A106, ASTM A179, JIS G3445

　　Materials available with 10#, 20#, 35, 45, 40Cr, 25Mn. 37Mn5, St35(E235), St37.4, St45(E255), St52(E355) and etc.

　　Size Tolerances

　　For hot rolling precision steel pipe, tolerance of OD is +/- 0.1%.

　　For cold drawn precision pipe, tolerance allowed in below conditions:

　　Diameters 6mm to 10mm, normal tolerance condition +/- 0.2%, premium tolerance condition +/- 0.15%.

　　10mm to 30mm, normal tolerance condition +/- 0.4%, premium tolerance condition +/- 0.2%.

　　30mm to 50mm, normal tolerance condition +/- 0.45%, premium tolerance condition +/-0.3%.

　　For outer diameters above 50mm, normal tolerance condition +/- 0.1%, premium tolerance condition +/- 0.8%.

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