according to DIN EN 10305-2
Steel grade: E355
supplied in delivery condition: +C
Drawn inner surface
Tolerance H8 - H10

or according to previous DIN standard:
DIN 2393
Steel grade: St 52-3
supplied in delivery condition: BK
Tolerance H8 - H10

Range of dimensions:
Outer diameter: 16 to 132 mm
Wall thickness: 1.5 to 7.5 mm

Range of dimensions for welded cylinder tubes  (PDF file 37 kb)

* Grades and dimensions other than those listed here are
   available on request.