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