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々 Classification and designation of the steel grades
| Delivery condition | Classification in accordance with EN 10020 | Steel name | Steel number |
| Normalized or normalizing formed | non-alloy quality steel | L245NB | 1.0457 |
| L290NB | 1.0484 | ||
| L360NB | 1.0582 | ||
| alloy special steel | L415NB | 1.8972 | |
| Quenched and tempered | non-alloy quality steel | L360QB | 1.8948 |
| alloy special steel | L415QB | 1.8947 | |
| L450QB | 1.8952 | ||
| L485QB | 1.8955 | ||
| L555QB | 1.8957 | ||
| Thermomechanically rolled | non-alloy qualiy steel | L245MB | 1.0418 |
| L290MB | 1.0429 | ||
| L360MB | 1.0578 | ||
| alloy special steel | L415MB | 1.8973 | |
| L450MB | 1.8975 | ||
| L485MB | 1.8977 | ||
| L555MB | 1.8978 |
々 Requirements for the result of tenile and bend test for wall thickness T≤25 mm a and for the hydrostatic test
| Steel grade | Pipe body b(seamless and welded pipes) | Weld seam(SAW and COW pipe) | Entire pipe | ||||
| Steel name | Steel number | Yield strength Rt0.5 MPA |
Tensile strength Rm MPA min. |
Rt0.5/Rmc max. | Elongation d A % min. | Diameter of the mandrel for bend test e (see 9.4.5) | Hydrostatic test(see 9.4.8) |
| L245NB | 1.0457 | 245 to 440 | 415 | 0.80 | 22 | 3T | Each length of pipe shall withstand the test without showing leakage or visible deformation |
| L245MB | 1.0418 | 0.85 | |||||
| L290NB | 1.0484 | 290 to 440 | 415 | 0.85 | 21 | 3T | |
| L290MB | 1.0429 | 0.85 | |||||
| L360NB | 1.0582 | 360 to 510 | 460 | 0.85 | 20 | 4T | |
| L360QB | 1.8948 | 0.88 | |||||
| L360MB | 1.0578 | 0.85 | |||||
| L415NB | 1.8972 | 415 to 565 | 520 | 0.85 | 18 | 5T | |
|
L415QB |
1.8947 | 0.88 | |||||
| L415MB | 1.8973 | 0.85 | |||||
| L450QB | 1.8952 | 450 to 570 | 535 | 0.90 | 18 | 6T | |
| L450MB | 1.8975 | 0.87 | |||||
| L485QB | 1.8955 | 485 to 605 | 570 | 0.90 | 18 | 6T | |
| L485MB | 1.8977 | 0.90 | |||||
| L555QB | 1.8957 | 555 to 675 | 625 | 0.90 | 18 | 6T | |
| L555MB | 1.8978 | 0.90 | |||||
|
a Mechanical properties of pipes with pipes with greater wall thickness up to 40 mm are to be agreed. b The same Rm values apply for the weld seam of HFW,SAW and COW pipe. c The values for the yield strength ratio apply to the priduct pipe.They cannot be require for the starting material. d These values apply ti transverse specimens taken from the pipe body.When longitudinal specimens are tested (see Table 18),the values of elongation shall be 2 units higher. e T=specified wall thickness of the pipe. |
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々 Tolerances on wall thickness
| Wall thickness T mm | Permissible toterance |
| Seamless pipe a | |
| T≤4 | +0.6mm/-0.5mm |
| 4＜T ＜25 | +15%/-12.5% |
| T≥25 | +3.75 mm/-3.0mm or ± 10%(whichever is the greater) |
| Welded pipe | |
| T≤10 | +1.0mm/-0.5mm |
| 10＜ T＜20 | +10%/-5% |
| T＞20 | +2.0mm/-1.0mm |
|
a For outside diameters D≥355.6 mm,it is permitted to exceed the upper wall thickness locally by further 5% of the specified wall thickness.However,the mass tolerance in 8.6.6 applies. |
|
々 Requirements for random length groups
| Length group | Length range for 90% of order item a | Minimun average length of order item | Shortest length of order ietm |
| r1 | 6 to 11 | 8 | 4 |
| r2 | 9 to 14 | 11 | 6 |
| r3 | 10 to 16 | 13 |
7 |
| r4 | 11 to 18 | 15 | 8 |
| a The upper limit applies as an absolute maximun value for the length of each individual pipe. | |||
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