Application of Nb in TMCP Steel Plates for Linepipe and Structural Applications Volker Schwinn Dillinger Hütte GTS 1
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. TMCP – The role of Nb, London, 10th July 2013 2 ED/Schwinn
Specification limits on Nb for TMCP steel plates (exemplarily) API 5L (basic linepipe no limit on Nb, only Nb+V+Ti is max 0.15% spec) DNV-OS-F101 (offshore linepipe) Linepipe sour service (common practise) Linepipe offshore (common practise) EN10225 S420/460 Project linepipe specs are much (offshore structures) more restrictive than standards. API 2W (offshore Standard specs for structurals are most restrictive. structures) EN10225 S355 (offshore structures) 0 0,02 0,04 0,06 0,08 0,1 0,12 0,14 0,16 max Nb in % TMCP – The role of Nb, London, 10th July 2013 3 ED/Schwinn
Application of Nb in TMCP linepipe and structural grades at Dillinger Hütte GTS 700 S690 application-strength-thickness map S620 600 YS class in MPa X80 S550 500 S500 X70 S460 X65 X60 S420 400 S355 300 0 20 40 60 80 100 120 140 plate thickness in mm TMCP – The role of Nb, London, 10th July 2013 4 ED/Schwinn
Influence of Nb on the microstructure CuNiCrTi steel, thickness 76.2 mm (grade API 2W 60) 0.02 % Nb 0.003 % Nb TMCP – The role of Nb, London, 10th July 2013 5 ED/Schwinn
Influence of Nb on Rp0.2 and CVN impact energy CuNiCrTi steel, thickness 76.2 mm (grade API 2W 60) 600 TMCP 400 +PWHT (580°C, 4h) mid thickness position 500 470 451 421 300 req. CVN at -80°C at t/2 in J 400 376 242 Rp0.2 in MPa 232 300 200 180 165 200 100 100 req. at -40°C 0 0 0.003 0.02 0.003 0.02 Nb in wt% Nb in wt% TMCP – The role of Nb, London, 10th July 2013 6 ED/Schwinn
1st example: Application of Nb in TMCP linepipe grades 700 S690 K65 Bovanenkovo-Ukhta Project S620 600 YS class in MPa X80 S550 500 S500 X70 S460 X65 X60 S420 400 S355 300 0 20 40 60 80 100 120 140 plate thickness in mm TMCP – The role of Nb, London, 10th July 2013 7 ED/Schwinn
K65 for Bovanenkovo-Ukhta Project: much more than a X80 API X80 requirement K65 typical Bovanenkovo-Ukhta 555 MPa 555 MPa K65 YS t = 27.7 mm, 56” 1100 km long 640 MPa 625 MPa TS A5 18 % A2“ 20 % elongation 200 J (-40 °C) 68 J (-10 °C) CVN 85/75 %SA 85/75 %SA BDWTT (-20 °C) (-10 °C) 0.45 0.48 CE iiw qualification burst test - plate width 4400 mm TMCP – The role of Nb, London, 10th July 2013 8 ED/Schwinn
2nd example: Application of Nb in TMCP linepipe grades 700 S690 SAWL 485 IFD(U) S620 Nord Stream Offshore 600 Pipeline Project YS class in MPa X80 S550 500 S500 X70 S460 X65 X60 S420 400 S355 300 0 20 40 60 80 100 120 140 plate thickness in mm TMCP – The role of Nb, London, 10th July 2013 9 ED/Schwinn
Nord Stream Offshore Pipeline Two parallel 48” pipelines Baltic 1224 km long, each Sea Total capacity 55 bcm per year SAWL 485 IFD(U) pipeline source: www.enerigie-und-umwelt.at t = 26.8, 30.9, 34.6 and 41 mm 1224 km wall thickness 26.8 mm 30.9 mm 34.6 mm 41 mm 170 bar 220 bar More than 1 mill. tons (> 50% of total volume) of plates are delivered by Dillinger Hütte. TMCP – The role of Nb, London, 10th July 2013 10 ED/Schwinn
3rd example: Application of Nb in TMCP linepipe grades 700 S690 X70 plates for pipes for the compressor station (CS Portovaya) S620 for the Nord Stream Offshore 600 Pipeline Project YS class in MPa X80 S550 500 S500 X70 S460 X65 X60 S420 400 S355 300 0 20 40 60 80 100 120 140 plate thickness in mm TMCP – The role of Nb, London, 10th July 2013 11 ED/Schwinn
Onshore arctic with BDWTT requirement at -67 °C on plates for pipes for CS Portovaya The only compressor station for the whole Nord Stream gas pipeline. API 5L X70 BDWTT at -67 °C Plate thickness 29 mm 32 mm 39 mm 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 TMCP – The role of Nb, London, 10th July 2013 12 ED/Schwinn
BDWTT and YS for API 5L X70 for CS Portovaya, plate thickness 39 mm 80 50 YS BDWTT 70 requirement min 485 MPa requirement min 75 % 40 60 frequency in % frequency in % 50 30 40 20 30 20 10 10 0 0 70 75 80 85 90 95 100 520 530 540 550 560 570 580 590 600 %SA at -67 °C (single values) Rt0.5, transverse in MPa TMCP – The role of Nb, London, 10th July 2013 13 ED/Schwinn
grain sizes in terms of EBSD* for different steel designs (exemplarily) *EBSD = Electron Backscatter Diffraction misorientation map: different color means 5° between different microstructures Onshore arctic Offshore RD Such very fine microstructures are only feasible by the addition of Nb combined with proper process parameters TMCP – The role of Nb, London, 10th July 2013 14 ED/Schwinn
4th example: Application of Nb in TMCP structural grades BP Clair Ridge 700 S690 Offshore Platform Project High variety of grades and S620 dimensions 600 CVN at -40°C in mid YS class in MPa thickness position X80 S550 500 S500 X70 S460 X65 X60 S420 400 S355 300 0 20 40 60 80 100 120 140 plate thickness in mm TMCP – The role of Nb, London, 10th July 2013 15 ED/Schwinn
BP Clair ridge offshore platform, phase 2: 55 kt plate deliveries for jackets and topside source: www.ingworldnews.com location: north of UK source: www.bp.com TMCP – The role of Nb, London, 10th July 2013 16 ED/Schwinn
5th example: Application of Nb in TMCP structural grades S355ML for London 700 S690 Array Windfarm Project Heavyweight plates up to 26 t S620 were delivered 600 CVN at -50°C in quarter YS class in MPa thickness position X80 S550 500 S500 X70 S460 X65 X60 S420 400 S355 300 0 20 40 60 80 100 120 140 plate thickness in mm TMCP – The role of Nb, London, 10th July 2013 17 ED/Schwinn
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: source: www.spiegel.de 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 Monopile Weight: 200 – 650 t Length: 33 – 65 m 4.7 – 5.7 m Transition piece Weight 245 – 345 t Length 20 – 28 m TMCP – The role of Nb, London, 10th July 2013 18 ED/Schwinn
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- grade linepipe and structural applications. This was demonstrated by examples. TMCP – The role of Nb, London, 10th July 2013 19 ED/Schwinn
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