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Development, Specifications, and Application Experience with 80 ksi (552 MPa) Linepipe by J. Malcolm Gray Paper presented at the ABM Annual Congress Vitoria,

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Presentation on theme: "Development, Specifications, and Application Experience with 80 ksi (552 MPa) Linepipe by J. Malcolm Gray Paper presented at the ABM Annual Congress Vitoria,"— Presentation transcript:

1 Development, Specifications, and Application Experience with 80 ksi (552 MPa) Linepipe by J. Malcolm Gray Paper presented at the ABM Annual Congress Vitoria, Brasil 23 July 2007

2 Overview Introduction Application Metallurgical Approaches Chemical Compositions Specifications Weldability Fracture Control

3 Figure 1. Development periods for high strength linepipe

4 Figure 2. Increase in North American natural gas pipeline operating pressures 1)

5 Macro Trends Higher Pressures Thicker Wall Higher Toughness Lower Carbon Higher Alloy Contents Need for updated specifications. Cost pressures due to steel prices. Globalization of manufacture.

6 Figure 3. Progress in adopting X-80 Steel.

7 TypeCMnNbVTiMoCrOther Nb – V 0.05/ / Nb – Ti / Nb - Mo Cu + Ni Nb – Cr 0.03/ Cu + Ni Table III

8 Figure 4. Comparison of HAZ hardnesses for mechanized welds in Nb-Mo, Nb-Cr & Nb-V Steel.

9 Steel Type CMnSiNbVTiCrMoCuNiNPcm Nb-V Nb-Cr Nb-Mo Table IV Chemical Compositions of X-80 Pipe Use For Recent Projects

10 (a)No prior use of X-70/80 acicular ferrite steels. (b)Lack of knowledge or confidence. (c)Isolation. (d)Committee squabbling. (e)Copy and paste mentality at Engineering companies. (f)No platform for change. (g)Bureaucratic inertia. (h)Long term bad habits.

11 Table V Summary of EWI Microalloying Recommend Chemical Composition Limits

12

13 Figure 5. Comparison of limits for vanadium and niobium for different pipe grades.

14 Figure 6. HAZ hardness as a function of heat input and Pcm.

15 Figure 7. Comparison of mean hot rolling flow stress – X70 and X80 steels 8)

16

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18 Development of Blended Approach to Defect Acceptance Criteria (Shaded area was adopted by the project) Figure 15. Defect acceptance levels for Cheyenne Plains X-80 Girth Welds.

19 Figure 16. Fracture Arrest Predictions: Recent Analyses for X-100

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21 ProjectYearCompanyCountryProductGradeWall thickness (mm) Tons TCPL1972- Present IpscoCanadaCoil and Pipe X-70/ TCPL, Hearst Ontario 1982Algoma Steel Canadian Phoenix CanadaPlate Pipe Iroquois Project1990StelcoCanadaPipeX Cantarell1998Mittal Steel PMT MexicoSlab, Plate, Pipe X70 sour gas Cameron Highway, offshore 2003Azov Stal SteelUkrainePlateX WelspunIndiaPipeX Cheyenne Plains2004Oregon Steel Mills/Napa Pipe USAPlate, Coil, Pipe X st West-East Gas Pipeline 2004Bao SteelChinaPlate and Coil X70 Anshan SteelChinaPlateX70 Julong PipeChinaPipeX70 EuropipeGermanyPipeX Independence Trail, offshore 2005Azov Stal Welspun Ukraine India PlateX TCPL2005Azov Stal Welspun Ukraine India Plate Pipe X-75 (X- 80) Gulf South2006Nanjing SteelChinaPlate and Coil X-80 Rockies Express Oregon SteelUSACoilX70/X8014.3/15.9 Production History 0.10% Niobium HTP Steel

22 Figure 17

23 Figure 18. Relationship between maximum thinning strain e f and Charpy energy


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