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 /  /  /  / Hot-rolled coils for the manufacture of large-diameter pipes

Hot-rolled coils for the manufacture of large-diameter pipes

Usage

Salzgitter Flachstahl supplies hot-rolled wide coil for the manufacture of large-diameter pipes. Large-diameter pipes are predominantly used for carrying gas and liquids under high pressure and as piling pipes. There are different manufacturing processes.

The technological values of the finished pipe are laid down in the standards API 5L and EN 10208-2. Salzgitter Flachstahl warrants the hot-rolled wide coil standards. When ordering hot-rolled wide coil for pipe manufacturing, the necessary technical key data have to be coordinated. Information about pipe diameter and welding process allow an estimation of the pipe data.

Standards1)

International Europa Material No. Europa Material No. D USA Material No. USA Material No. FK2)
ISO 3183 EN 10208-2 DIN 17172 (†) API 5L
Sweet gas Sour gas Sweet gas Sour gas
L245NB/NE L245NB/NE 1.8790/1.0457 - - StE 240.7 Grade BN 1.8790 - - A
L290NB/NE L290NB/NE 1.8791/1.0484 - - StE 290.7 X42N 1.8791 - - B
L320NB L320NB 1.8792 - - - X46N 1.8792 - - C
L360NB L360NB 1.8793 - - StE 360.7 X52N 1.8793 - - C
L390NB L390NB 1.8970 - - - X56N 1.8970 - - D
L245MB/ME L245MB/ME 1.8746/1.0418 - - StE 240.7 Grade BM - - B
L290MB/ME L290MB/ME 1.8747/1.0429 - - StE 290.7 X42M - - B
L320MB L320MB 1.8729/1.0430 L320MS 1.1032 - X46M 1.8748 X46MS 1.1032 C
L360MB/ME/MS L360MB/ME 1.8749/1.0578 L360MS 1.1033 StE 360.7 X52M 1.8749 X52MS 1.1033 C
L390MB/ME/MS L390MB 1.8971 L390MS 1.1034 StE 385.7 X56M 1.8971 X56MS 1.1034 D
L415MB/ME/MS L415MB 1.8752/1.8973 L415MS 1.8766 StE 415.7 X60M 1.8725 X60MS 1.8766 D
L450MB/ME/MS L450MB/ME 1.8754/1.8975 L450MS 1.8767 StE 445.7 X65M 1.8726 X65MS 1.8767 D
L485MB/ME L485MB/ME 1.8756/1.8977 - - StE 480.7 X70M 1.8727 - - D

Chemical composition in percent by weight [%] (Heat analysis)

Grade C Si Mn P S Ti V Nb Sonstige CE1)
EN 10208-2 max. max. max. max. max. max. max. max. max.
L245NB 0.162) 0.40 1.10 0.025 0.020 - - - 3) 0.42
L290NB 0.172) 0.40 1.20 0.025 0.020 0.04 0.05 0.05 3) 0.42
L360NB 0.202) 0.45 1.60 0.025 0.020 0.04 0.10 0.05 3), 4) 0.45
L245MB 0.162) 0.45 1.50 0.025 0.020 - 0.04 0.04 3) 0.40
L290MB 0.162) 0.45 1.50 0.025 0.020 - 0.04 0.04 3) 0.40
L360MB 0.162) 0.45 1.60 0.025 0.020 0.04 0.05 0.05 3) 0.41
L415MB 0.162) 0.45 1.60 0.025 0.020 0.06 0.08 0.05 3), 4) 0.42
L450MB 0.162) 0.45 1.60 0.025 0.020 0.06 0.10 0.05 3), 4) 0.43
L485MB 0.162) 0.45 1.70 0.025 0.020 0.06 0.10 0.06 3), 4) 0.43
API 5 L
Gr. B 0.265) - 1.20 0.030 0.030 - - - 4), 6) -
X 42 0.265) - 1.30 0.030 0.030 - - - 4) -
X 46 0.265) - 1.40 0.030 0.030 - - - 4) -
X 52 0.265) - 1.40 0.030 0.030 - - - 4) -
X 56 0.265) - 1.40 0.030 0.030 - - - 4) -
X 60 0.265) - 1.40 0.030 0.030 - - - 7) -
X 65 0.265) - 1.45 0.030 0.030 - - - 7) -
X 70 0.265) - 1.65 0.030 0.030 - - - 7) -

Mechanical properties1) according to pipe standards (EN 10208-2 and API 5 L)

Grade Yield strength Rt 0,5 Min. tensile strength Rm Min. elongation A5 Min. notch impact energy at 0°C Drop weight tear test min. amount
of fracture by shear stress at 0°C
MPa MPa % J %
EN 10208–2
L245NB 245 - 440 415 22 - 2)
L245MB 245 - 440 415 22 - 2)
L290NB 290 - 440 415 21 - 2)
L290MB 290 - 440 415 21 - 2)
L360NB 360 - 510 460 20 - 2)
L360MB 360 - 510 460 20 - 2)
L415MB 415 - 565 520 18 - 853)
L450MB 450 - 570 535 18 - 853)
L485MB 485 - 605 570 18 - 853)
API 5 L
Gr. B min. 245 415 29,54) 685) 605)
X 42 min. 290 415 29,54) 685) 605)
X 46 min. 320 435 28,54) 685) 605)
X 52 min. 360 460 27,04) 685) 605)
X 56 min. 390 490 25,54) 685) 605)
X 60 min. 415 520 24,04) 685) 605)
X 65 min. 450 535 23,54) 685) 605)
X 70 min 485 570 22,54) 685) 605)

Drop weight test

According to prior agreement, the steel grades can be supplied as per DIN EN 10274, while also ensuring DWTT values.

Hot-forming properties

The normalized rolled steel grades L245NB - L415NB are suitable for hot forming. Hot forming of the thermomechanical rolled steel grades L245MB - L485MB above 580°C may cause a decrease of yield point and tensile strength and should therefore be avoided. If the pipes are intended for manufacturing inductive bends, this has to be coordinated with the producer.

Heat treatment

Normalized and stress relief annealing of the normalized rolled steel grades is possible. Since normalized and stress relief annealing above 580 °C of the thermomechanical rolled steel grades may cause a decrease of yield point and tensile strength, both heat treatment methods should be avoided.

Welding

Observing the general technical directions, the steel is weldable by hand as well as mechanically according to all electric processes. A preheating of the steel for welding purposes is not necessary if normal laying conditions prevail. It has to be taken into account that the behaviour of this steel during welding and thereafter depends not only on the material but also on the conditions of welding the pipeline and may thus be impaired.

The filler metals to be used for these tensile strengths are welding rods and electrodes approved accordingly.

Condition of delivery, scope of testing and certificate

Delivery and test can be agreed to be made similar to EN 10208-2 and API 5 L. Especially at spiral-welded pipes, the customer has to consider the Bauschinger effect when ordering hot-rolled coils. By agreement, hot-rolled steels of a thickness of up to 24mm can be delivered.

Certificates according to DIN EN 10204 can be supplied as follows: IT, DUN, FAX, e-mail, paper.

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