EN 10208 carbon steel pipes are designed for transporting gas, oil, and other combustible fluids under specific pressures in industries such as mining, chemical processing, and power engineering.
Steel grades used requirement class A
L210GA
L235GA
L245GA
L290GA
L360GA
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 |
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Hot rolling and cold finishing |
Normalization |
N |
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Heat treatment |
Q |
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High frequency welding (HFW) |
Normalized rolled strips |
Cold forming |
Normalization of the weld area |
N |
Thermomechanically rolled strips |
Heat treated weld area |
M |
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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 |
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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 |
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Rolled sheets or strips |
Normalization plastic forming |
- |
M |
|
Normalized or normalized rolled sheets or strips |
N |
Chemical composition according to the ladle analysis for the wall thickness of < or= 25mm
Steel designation |
Maximum content, % |
CEV max. |
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Steel symbol |
C |
Si |
Mn |
P |
S |
V |
Nb |
Ti |
Other |
|
Steels for seamless and welded pipes |
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L245NB |
0,16 |
0,40 |
1,1 |
0,025 |
- |
- |
- |
- |
|
0,42 |
Steels for seamless pipes |
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L360QB |
0,16 |
0,45 |
1,4 |
0,025 |
0,020 |
0,05 |
0,05 |
0,04 |
|
0,42 |
Steels for welded pipes |
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L245MB |
0,16 |
0,45 |
1,5 |
0,025 |
0,020 |
0,04 |
0,4 |
- |
|
0,40 |
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 |
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HFW, SAW, COW |
SAW, COW |
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Steel symbol |
Plastic limit R 10,5N/mm 2 |
Tensile strength R mN/mm 2min. |
R10,5/RmMax |
Elongation A% min. |
Tensile strength R mN/mm 2min |
Diameter of the bending mandrel bar in the bending test |
Pressure water test |
L245NB |
245 to 440 |
415 |
0,80 |
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 |
290 to 440 |
415 |
0,85 |
21 |
3T |
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L360NB |
360 to 510 |
460 |
0,85 |
20 |
4T |
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L415NB |
415 to 565 |
520 |
0,85 |
18 |
5T |
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L450QB |
450 to 570 |
535 |
0,90 |
18 |
6T |
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L485QB |
485 to 605 |
570 |
0,90 |
18 |
6T |
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L555QB |
555 to 675 |
625 |
0,90 |
18 |
6T |