EN 10208-1

EN 10208-1,2 Steel pipes are used for transporting gas, oil, combustible fluids with specific pressure in the mining, chemical, and power engineering industry.

EN 10208-1 Steel pipes are manufactured with the diameters between 21,3 – 660 mm and with the wall thickness of up to 40 mm in the case of hot rolled seamless pipes, and with the diameters between 10,2 – 108 and with the wall thickness of up to 10 mm in the case of cold drawn seamless pipes.

Standard description Steel pipes for pipelines for combustible fluids. Pipes of requirement class A.
Manufacturing Manufactured as seamless pipes and as welded pipes.
Details: Table 1
Steel grades used Requirement class A
L210GA, L235GA, L245GA, L290GA, L360GA
Details: Table 2
Dimensions and tolerances For the outside diameter of welded pipes
For D<60mm +/-0,75% or +/- 0,5 mm depending on which value is greater.
For 60<D<610 +/-0,75% or +/- 0,5 mm depending on which value is greater.
For 610<D<1410 +/-0,5% or +/- 4,0 mm depending on which value is greater.
For D>1410 to be negotiated
Tightness Pipes should be subject to water testing (7Mpa) or electromagnetic testing.
Straightness < 0,0015 of pipe length (below 3 mm per every meter of pipe length)
Tests Details: Table 3
Table 1

Pipe types and the manufacturing process (original material, plastic forming and thermal processing state)

Pipe type Original material Plastic forming of the pipe1) Thermal processing state Thermal processing symbol
Seamless (S) Ingot or block Hot rolling Normalization or normalization plastic forming N
Heat treatment Q
Hot rolling and cold finishing Normalization N
Heat treatment Q
High frequency welding (HFW) Normalized rolled strips Cold forming Normalization of the weld area N
Thermomechanically rolled strips Heat treated weld area M
Hot rolled strips or normalized rolled strips Cold forming and reduction with hot tensioning at controlled temperature so as to achieve a normalized state Normalization (whole pipe) N
N
Submerged arc welding (SAW) -longitudinal (SAWL) -spiral (SAWH) or combined welding (COW) -longitudinal (COWL) –spiral (COWH_ Normalized or normalized rolled sheets or strips Cold forming N
Thermomechanically rolled sheets or strips
Rolled sheets or strips Normalization plastic forming M
Normalized or normalized rolled sheets or strips N
Table 2

Chemical composition according to the ladle analysis for the wall thickness of < or= 25mm

Steel designation Maximum content, % CEV max.
Steel symbol Steel number C Si Mn P S V Nb Ti Other
Steels for seamless and welded pipes
L245NB
L290NB
L360NB
L415NB
0,16
0,17
0,20
0,21

0,40
0,40
0,45
0,45

1,1
1,2
1,6
1,6

0,025
0,025
0,025
0,025


0,05
0,10
0,15


0,05
0,10
0,15


0,05
0,05
0,05


0,04
0,04
0,04

0,42
0,42
0,42
0,45
to be negotiated
Steels for seamless pipes
L360QB
L415QB
L450QB
L485QB
L555QB
0,16
0,16
0,16
0,16
0,16
0,45
0,45
0,45
0,45
0,45
1,4
1,6
1,6
1,7
1,8
0,025
0,025
0,025
0,025
0,025
0,020
0,020
0,020
0,020
0,020
0,05
0,08
0,09
0,10
0,10
0,05
0,05
0,05
0,05
0,06
0,04
0,04
0,06
0,06
0,06
0,42
0,43
0,45
0,45
to be negotiated
Steels for welded pipes
L245MB
L290MB
L360MB
L415MB
L450MB
L485MB
L555MB
0,16
0,16
0,16
0,16
0,16
0,16
0,16
0,45
0,45
0,45
0,45
0,45
0,45
0,45
1,5
1,5
1,6
1,6
1,6
1,7
1,8
0,025
0,025
0,025
0,025
0,025
0,025
0,025
0,020
0,020
0,020
0,020
0,020
0,020
0,020
0,04
0,04
0,05
0,08
0,10
0,10
0,10
0,4
0,4
0,5
0,5
0,5
0,6
0,6


0,04
0,06
0,06
0,06
0,06
0,40
0,40
0,41
0,42
0,43
0,43
to be negotiated

Required tension and bending test results for the wall thickness of < or = 25mm and of the pressure water test

Steel designation Pipe body (seamless pipe and welded pipe) Spiral weld Whole pipe
HFW, SAW, COW SAW, COW
Steel symbol Plastic limit R 10,5 N/mm 2 Tensile strength R m N/mm 2 min. R10,5/Rm Max Elongation A% min. Tensile strength R m N/mm 2 min Diameter of the bending mandrel bar in the bending test Pressure water test
L245NB
L245MB
245 to 440 415 0,80
0,85
22 The same values as for the pipe body apply 3T Every pipe should be subject to the test and it should be free of any leaks or deformations
L290NB
L290MB
290 to 440 415 0,85
0,85
21 3T
L360NB
L360QB
L360MB
360 to 510 460 0,85
0,88
0,85
20 4T
L415NB
L415QB
L415MB
415 to 565 520 0,85
0,88
0,85
18 5T
L450QB
L450MB
450 to 570 535 0,90
0,87
18 6T
L485QB
L485MB
485 to 605 570 0,90
0,90
18 6T
L555QB
L555MB
555 to 675 625 0,90
0,90
18 6T
Table 3
Tests and requirements
1 2 3 4 5
Nr Requirements provided in columns 3 to 8 apply to pipes 1) Test or requirement type Test status Test scope
S HFW SAW, COW welded
longitudinal spiral
A1 X X X X Ladle analysis M 1 analysis/ladle
A2 X X X X Check analysis M 1 analysis/ladle
B1 X X X X Tensile test –for pipe body M With the exception of the weld joining two strip ends, the tested unit should include only pipes -from the same ladle –of the same thermal processing state –with the same dimensions and a)for the diameter of < 508mm not more than 100 pipes b)otherwise, not more than 50 pipes. In the case of testing the weld joining two strip ends, the tested unit for every order number should not include more than 50 pipes. One pipe should be selected for testing out of every tested unit Samples from the tested pipe 1
B2 X X X -for the joint (D>or= 210mm) M 1
B3 X -for the weld joining two strip ends (D>or= 210mm) M 1
C1 X X X X Chrapy-V notch impact test (for T>or= mm)
-for pipe body
M 3
C2 X X X -for the joint M 3
C3 X – for the weld joining two strip ends M 3
D X X X X Drop weight tear test (DWTT) of pipe body O 2
E1 X X Bending test
-for the joint
M 2
E2 X – for the weld joining two strip ends M 2
f X Flattening test M 4 tests per one coil; plus 2 tests in the case of welding break
Nr Requirements provided in columns 3 to 8 apply to pipes 1) Test or requirement type Test status Test scope
S HFW SAW, COW welded
longitudinal spiral
G1 X X Macroscopic and metallographic test
-macroscopic
M Once per irregularity or if the pipe dimensions change
G2 X -metallographic M Once per irregularity or if the pipe dimensions or steel grade change
H1 X X X Hardness test M For cold formed pipes every hardened place with the length of more than 50 mm should be tested in any direction
H2 X O
I X X X X Pressure water test M After negotiation, the test is performed on HFW pipes with heat treated welds
J X X X X Surface inspection M Every pipe should be examined
K1 X X X X Dimension verification –outside or inside diameter and ovalness at pipe ends M The dimensions of every pipe should be examined
K2 X X X X -wall thickness at pipe ends M
K3 X X X X -other characteristic dimensions M Random testing, details to be determined by the person performing the test
K4 X X X -welded joint M
L X X X X Weighing M The mass of every pipe or of every batch should be determined
M X X X X Non-destructive testing See table D.1