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Home > Products > Hot-rolled products > Steel grades > Hot-rolled coils for the manufacture of large-diameter pipes
Hot-rolled coils for the manufacture of large-diameter pipes

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

Usage

Salzgitter Flachstahl supplies hotrolled 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.

The large diameter pipe qualities (according to API 5L through X70 or according to EN 10208 through L485MB) of Salzgitter Flachstahl have been tested and approved by the Technischer Überwachungsverein (TÜV) for application in longdistance pipelines (incl. DIN 2470, part 2).

Standards1)

Europa Material no. D USA FK2)
EN 10208-2   DIN 17172 API 5L  
L245NB 1.0457 StE 240.7 Gr. B A
L290NB 1.0484 StE 290.7 X 42 A
L360NB 1.0582 StE 360.7 X 52 B
L245MB 1.0418 StE 240.7 Gr. B A
L290MB 1.0429 StE 290.7 TM X 42 A
L360MB 1.0578 StE 360.7 TM X 52 B
L415MB 1.8973 StE 415.7 TM X 60 C
L450MB 1.8975 StE 445.7 TM X 65 C
L485MB 1.8977 StE 480.7 TM X 70 D

1) Other standards or specifications by agreement
2) FK = Tensile strength class, Dimensions

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

Grade C Si Mn P S Ti V Nb Other 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) - 1.302) 0.030 0.030 - - - 4) -
X 46 0.265) - 1.402) 0.030 0.030 - - - 4) -
X 52 0.265) - 1.402) 0.030 0.030 - - - 4) -
X 56 0.265) - 1.402) 0.030 0.030 - - - 4) -
X 60 0.265) - 1.402) 0.030 0.030 - - - 7) -
X 65 0.265) - 1.452) 0.030 0.030 - - - 7) -
X 70 0.265) - 1.652) 0.030 0.030 - - - 7) -


1) A max. carbon equivalent
    CE = C + Mn/6 + (Cr + Mo + V)/5 + (Cu + Ni)/15
   can be agreed upon. CE is determined for the check analysis only.
2) For a reduction by 0.01 % each below the max. carbon content an increase of the manganese content by 0.05 % above the max. value is permissible, the increase being limited to 0.2%
3) 0.015 ≤ Altotal< 0.060; N = 0.012; Al/N = 2;
    Cu = 0.25; Ni = 0.30; Cr = 0.30; Mo = 0.10
4) The total V, Nb, and Ti - contents must not exceed 0.15 %.
5) For a reduction by 0.01 % each below the max. carbon content an increase of the manganese content by 0.05 % above the max. content is permissible, the increase being limited to 1.65 % for steel grades = X 52, to 1.75 % for steel grades < X 70, and 2.00% for steel grade X 70. 
6) Unless otherwise agreed upon, the total Nb, and V - contents must not exceed 0.06 %.
7) Unless otherwise agreed upon, the total V, Nb, and Ti - contents must not exceed 0.15 %.

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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)

1) Values for pipe circumference tests
2) Not applicable
3) Mean value of two tests
4) Elongation on a 2-inch test specimen for a coil thickness of ≥ 8,42 mm, for smaller thicknesses correspondingly lower minimum elongations apply
5) Mean value of all heats

Drop weight test

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

The normalised rolled steel grades L245NB - L415NB are suitable for hotforming. Hot forming of the thermomechanically 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

Normalised and stress relief annealing of the normalised rolled steel grades is possible. Since normalised and stress relief annealing above 580 °C of the thermomechanically 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 strenghts 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.

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

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