En10305-4 Cold Drawn Galvanized Steel Tube Pipe

En10305-4 Cold Drawn Galvanized Steel Tube Pipe

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Product Details

Chemical Composition

Steel gradeC
max.
Si
max.
Mn
max.
P
max.
S
max.
Altot
min.
NameNumber
E2151.02120.10 0.050.70.0250.0150.025
E2351.03080.17 0.351.20.0250.015--
E3551.0580 0.22 0.551.60.0250.015--




Tolerance

Outer DiameterAllowable tolerancespecial tolerance
GB/T3639DIN2391ODWT
4mm-20mm±0.10mm±0.08mm±0.05mm±0.05mm
20mm-30mm±0.10mm±0.08mm±0.08mm±0.08mm
31mm-40mm±0.15mm±0.15mm±0.10mm±0.08mm
41mm-60mm±0.20mm±0.20mm±0.15mm±0.15mm
61mm-80mm±0.30mm±0.30mm±0.20mm±0.20mm
81mm-120mm±0.45mm±0.45mm±0.30mm±0.30mm




Mechanical Properties

Steel gradeYield strengthaTensile strengthElongation
NameNumberReH RmA
min.min.min.
MPaMPa%
E2151.0212215290 to 43030
E2351.0308235340 to 48025
E3551.0580 355490 to 63022




Delivery Condition

DesignationSymbolDescription
Cold finished (hard)BK(+C)
Tubes do not undergo heat treatment following the final cold forming and, thus, have a rather high resistance to deformation

Cold finished (Soft)BKW
(+LC)

The final heat treatment is followed by cold drawing involving limited deformation. Appropriate further processing allows a certain degree of cold forming (e.g. bending, expanding)

Cold finished and stress-relievedBKS(+SR)
Heat treatment is applied following the last cold forming process. Subject to appropriate processing conditions, the increase in the residual stresses involved enables both forming and machining to a certain degree.

AnnealedGBK(+A)The last Cold forming process is followed by annealing in a controlled atmosphere.
NormalizedNBK(+N)The last cold forming process is followed by annealing above the upper transformation point in a controlled atmosphere.


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