according to DIN EN 10305-1
Steel grade: E355
supplied in delivery condition: +SR
Roller-burnished or honed inner surface
Tolerance H8 - H11

or according to previous DIN standard:
DIN 2391
Steel grade: St 52
supplied in delivery condition: BKS

Range of dimensions:
Outer diameter: 25 to 330 mm
Wall thickness: 2.5 to 22.5 mm

Range of dimensions for seamless, cold-drawn cylinder tubes (PDF file 44 kb)

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