EN 10297 Mechanical seamless Tubes

EN 10297 Seamless circular steel tubes for mechanical and general engineering purposes. Technical delivery conditions. Non-alloy and alloy steel tubes.
Standard: BS EN 10297-1:2003

Applications of  EN10297:

Alloy and non-alloy steel pipes, with circular section for mechanical and engineering applications.
Process: Seamless

Tolerance and size range :

Outside diameter:
D<=219.1mm: +/-1%(Min+/-0.5mm)
D>219.1mm:+/-1%
Thickness:
D<=219.1mm:+/-12.5%(min +/-0.4mm)
D>219.1mm: itchanges according to the ratio thickness/ diameter
Tolerance on thickness related to t/CD:
<=0.0250.025<T<=0.050>0.050
 +/- 20% +/-15% +/-12.5%
Size range: According to DIN_EN_10220-2003 unless differently spcified by the customer

Straightness

D<33.7mm :not specified
D>=33.7mm :0.15% on the total length
Note:
D: Outside diameter
T: Nominal thickness (mm)

Out of proundness

Included in the outside diameter tolerance

Standard and Steel grade:

  • EN 10297 E235
  • EN 10297 E355
  • EN 10297 C35E
  • 20MnV6

Certification: UNI EN10204.3.1

Chemical analysis [%] of  EN 10297:

Steel gradeCSiMnPS
E235≤0,17≤0,35≤1,20≤0,040≤0,045
E355≤0,22≤0,55≤1,60≤0,040≤0,045
C35E0,32 – 0,39≤0,400,50 – 0,800,035≤0,035
20MnV60,16 – 0,220,10 – 0,501,30 – 1,70≤0,035≤0,040

Mechanical properties of EN 10297:

Steel gradeSupply condtionReH min [MPa]Rm min [MPa]A [%]
T≤1616<T≤25T≤1616<T≤25
E235AR23522536036025
E355AR35534549049020
C35EN30028052050017
20MnV6AR47045065062017

Condition on delivery:

TermSymbolExplanation
Cold-finished/hard
(cold-finished as-drawn)
BKNo heat treatment after the last cold-forming process. The tubes therefore have only low deformability.
Cold-finished/soft
(lightly cold-worked)
BKWAfter the last heat treatment there is a light finishing pass (cold drawing) With proper subsequent processing, the tube can be cold-formed (e.g. bent, expanded) within certain limits.
AnnealedGBKAfter the final cold-forming process the tubes are annealed in a controlled atmosphere or under vacuum.
NormalizedNBKThe tubes are annealed above the upper transformation point in a controlled atmosphere or under vacuum.

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