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Application of Nb in TMCP Steel Plates for Linepipe and Structural Applications Volker Schwinn Dillinger Htte GTS 1 Introduction Objective of the presentation To demonstrate the wide range of utilization of Nb in linepipe and structural

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Application of Nb in TMCP Steel Plates for Linepipe and Structural Applications

Volker Schwinn Dillinger Hütte GTS

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TMCP – The role of Nb, London, 10th July 2013

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Introduction

Objective of the presentation To demonstrate the wide range of utilization of Nb in linepipe and structural TMCP steel plates by presentation of 5 linepipe and structural projects of plate deliveries with bigger quantities General introductory remarks Starting from a CMn-steel, Nb is the very first element that is added in TMCP steel plates. Nb is well recognised to improve properties, but the addition has to be combined with proper plate process parameters in order to exploit the effect of Nb.

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Specification limits on Nb for TMCP steel plates (exemplarily)

0,02 0,04 0,06 0,08 0,1 0,12 0,14 0,16 EN10225 S355 (offshore structures) API 2W (offshore structures) EN10225 S420/460 (offshore structures) Linepipe offshore (common practise) Linepipe sour service (common practise) DNV-OS-F101 (offshore linepipe) API 5L (basic linepipe spec) max Nb in % no limit on Nb, only Nb+V+Ti is max 0.15% Project linepipe specs are much more restrictive than standards. Standard specs for structurals are most restrictive.

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Application of Nb in TMCP linepipe and structural grades at Dillinger Hütte GTS

300 400 500 600 700 20 40 60 80 100 120 140 plate thickness in mm YS class in MPa

X80 S550 S500 S420 S460 X70 X65 S355 X60 S620 S690

application-strength-thickness map

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Influence of Nb on the microstructure

CuNiCrTi steel, thickness 76.2 mm (grade API 2W 60)

0.02 % Nb 0.003 % Nb

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Influence of Nb on Rp0.2 and CVN impact energy

CuNiCrTi steel, thickness 76.2 mm (grade API 2W 60)

421 470 451 376 100 200 300 400 500 600 0.003 0.02 Nb in wt% Rp0.2 in MPa TMCP +PWHT (580°C, 4h) req. 242 232 180 165 100 200 300 400 0.003 0.02 Nb in wt% CVN at -80°C at t/2 in J

req. at -40°C

mid thickness position

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TMCP – The role of Nb, London, 10th July 2013

7 X80 S550

300 400 500 600 700 20 40 60 80 100 120 140 plate thickness in mm YS class in MPa

1st example: Application of Nb in TMCP linepipe grades

S500 S420 S460 X70 X65 S355 X60 S620 S690

K65 Bovanenkovo-Ukhta Project

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K65 for Bovanenkovo-Ukhta Project: much more than a X80

Bovanenkovo-Ukhta K65 t = 27.7 mm, 56” 1100 km long requirement K65 API X80 typical YS  555 MPa  555 MPa TS  640 MPa  625 MPa elongation A5  18 % A2“  20 % CVN  200 J (-40 °C)  68 J (-10 °C) BDWTT  85/75 %SA (-20 °C)  85/75 %SA (-10 °C) CEiiw  0.45  0.48 qualification burst test

plate width

4400 mm

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2nd example: Application of Nb in TMCP linepipe grades

300 400 500 600 700 20 40 60 80 100 120 140 plate thickness in mm YS class in MPa

X80 S550 S500 S420 S460 X70 X65 S355 X60 S620 S690

SAWL 485 IFD(U) Nord Stream Offshore Pipeline Project

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Nord Stream Offshore Pipeline

Baltic Sea 220 bar wall thickness 26.8 mm 30.9 mm 34.6 mm 41 mm 170 bar More than 1 mill. tons (> 50% of total volume) of plates are delivered by Dillinger Hütte. 1224 km

pipeline

source: www.enerigie-und-umwelt.at

Two parallel 48” pipelines 1224 km long, each Total capacity 55 bcm per year SAWL 485 IFD(U) t = 26.8, 30.9, 34.6 and 41 mm

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3rd example: Application of Nb in TMCP linepipe grades

300 400 500 600 700 20 40 60 80 100 120 140 plate thickness in mm YS class in MPa

X80 S550 S500 S420 S460 X70 X65 S355 X60 S620 S690

X70 plates for pipes for the compressor station (CS Portovaya) for the Nord Stream Offshore Pipeline Project

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12 Onshore arctic with BDWTT requirement at -67 °C on plates for pipes for CS Portovaya

API 5L X70

BDWTT at -67 °C Plate thickness 29 mm 32 mm 39 mm

The only compressor station for the whole Nord Stream gas pipeline.

The Portovaya CS is a unique gas transmission facility in terms of capacity (366 MW) and operating pressure (220 Ata) having no counterparts in the world.

source: www.gazprom.com

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13 BDWTT and YS for API 5L X70 for CS Portovaya, plate thickness 39 mm

10 20 30 40 50 520 530 540 550 560 570 580 590 600 Rt0.5, transverse in MPa frequency in % YS requirement min 485 MPa 10 20 30 40 50 60 70 80 70 75 80 85 90 95 100 %SA at -67 °C (single values) frequency in % BDWTT requirement min 75 %

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grain sizes in terms of EBSD* for different steel designs (exemplarily)

Offshore Onshore arctic RD

*EBSD = Electron Backscatter Diffraction

misorientation map: different color means  5° between different microstructures

Such very fine microstructures are only feasible by the addition of Nb combined with proper process parameters

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15 300 400 500 600 700 20 40 60 80 100 120 140 plate thickness in mm YS class in MPa

4th example: Application of Nb in TMCP structural grades

X80 S550 S500 S420 S460 X70 X65 S355 X60 S620 S690

BP Clair Ridge Offshore Platform Project

High variety of grades and dimensions CVN at -40°C in mid thickness position

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BP Clair ridge offshore platform, phase 2: 55 kt plate deliveries for jackets and topside

source: www.ingworldnews.com source: www.bp.com

location: north of UK

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17 300 400 500 600 700 20 40 60 80 100 120 140 plate thickness in mm YS class in MPa

5th example: Application of Nb in TMCP structural grades

X80 S550 S500 S420 S460 X70 X65 S355 X60 S620 S690

S355ML for London Array Windfarm Project

Heavyweight plates up to 26 t were delivered CVN at -50°C in quarter thickness position

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Offshore Wind - Project London Array: 42 kt TMCP plate deliveries for monopiles and transition pieces

Technical features Located in the outer Thames Estuary, area 245 km² Phase I: 175 turbines, 630 MW, fully operational on 8th April 2013 Phase II: 341 turbines, 1,000 MW Finally power up to 750,000 homes (1 quarter of Greater London) Water depth 5 – 23 m

source: www.spiegel.de

Monopile Weight: 200 – 650 t Length: 33 – 65 m  4.7 – 5.7 m Transition piece Weight 245 – 345 t Length 20 – 28 m

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Summary

Nb is established as the key element for all TMCP steels. Nb is effective also in thick wall TMCP steels. The utilization of Nb provides the basis to produce steel plates for high-