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Development of Niobium-alloyed large diameter pipes Sandrine Bremer, Volker Flaxa; Salzgitter Mannesmann Forschung GmbH Franz Martin Knoop; Salzgitter.

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Presentation on theme: "Development of Niobium-alloyed large diameter pipes Sandrine Bremer, Volker Flaxa; Salzgitter Mannesmann Forschung GmbH Franz Martin Knoop; Salzgitter."— Presentation transcript:

1 Development of Niobium-alloyed large diameter pipes Sandrine Bremer, Volker Flaxa; Salzgitter Mannesmann Forschung GmbH Franz Martin Knoop; Salzgitter Mannesmann Grossrohr GmbH London, 7 th July 2010

2 SZMF/ New Materials and Technologies, Bremer, Slide 2 Content Salzgitter Group Organisation & Structure Partners Motivation Large diameter line pipe From ore to pipe A novel, Nb-containing alloying concept Technical realisation Microstructure & properties Benefits of novel steel composition

3 SZMF/ New Materials and Technologies, Bremer, Slide : Crude steel production: 6.9 million tons; trading volume: 6.8 million tons Among the top 3 producers of beverage filling und packaging machinery Global Presence Salzgitter Group

4 SZMF/ New Materials and Technologies, Bremer, Slide 4 Total Sales: 4.3 billion External Sales: 3.0 billion Employees: 6,949 Steel Total Sales: 6.3 billion External Sales: 5.6 billion Employees: 1,983 Trading Total Sales: 1.3 billion External Sales: 0.5 billion Employees: 4,003 Services Total Sales: 1.0 billion External Sales: 1.0 billion Employees: 4,907 Technology Total Sales: 2.9 billion External Sales: 2.2 billion Employees: 5, 929 Tubes Group structure and key data FY 2008 Salzgitter AG Group External Sales cons.: 12.5 billion Internal Sales: 3.9 billion Employees: 23,915 All data about employees as per 31/12 Salzgitter Group

5 SZMF/ New Materials and Technologies, Bremer, Slide 5 The line pipe team Salzgitter AG Group (Holding) Motivation Steel Salzgitter Stahl GmbH Trading Services Salzgitter Mannesmann GmbH – Intermediate holding company Tubes Mannesmannröhren- Werke GmbH Tubes Mannesmannröhren- Werke GmbH Technology

6 SZMF/ New Materials and Technologies, Bremer, Slide 6 High-strength large diameter line pipe Motivation Transport of 51 mio. m 3 gas/day Total length: 2,120 km (1,322 mls) Start of operation segment 1: 01/2008 Start of operation: 06/2009 Total costs: approx. 4 bn. US$ Salzgitter supply: 168,500 t (ca. 420 km) 1,067 x 14,1 / 18,8 mm X70, FBE/EP, 18m

7 SZMF/ New Materials and Technologies, Bremer, Slide 7 High-strength large diameter line pipe Motivation

8 SZMF/ New Materials and Technologies, Bremer, Slide 8 Application of high-strength line pipe steels saves resources and costs! High-strength large diameter line pipe Motivation Increasing operating pressure (from 80 bar to 100 bar) for constant wall thickness (20 mm) efficiency Reduction of pipe wall thickness (from 20 mm to 18 mm) for constant operating pressure (80 bar) pipes` specific weight shipping investment costs for pipe laying Optimised in-field welding processes for girth welding time, material, testing and energy Strength [MPa] Weight [%] Steel grades accor. API 5L: X60 X70 X80 X

9 SZMF/ New Materials and Technologies, Bremer, Slide 9 From ore to pipe Large diameter line pipe Blast furnace Iron ore Pig iron Spiral pipe mill ø = 508 to 1676 mm t = 8 to 25 mm Continuous Casting Slab Steel works LD-Converter Ferro- Niobium Alloying stations Alloyed steel Hot-coiled strip Hot rolling mill Finishing train Roughing mill t = 1.5 to 25 mm w = 900 to 1,880 mm l = 100 to 2,000 m Furnace

10 SZMF/ New Materials and Technologies, Bremer, Slide 10 audio on this VT Do not play the Do not Play the audio on this clip!

11 SZMF/ New Materials and Technologies, Bremer, Slide 11

12 SZMF/ New Materials and Technologies, Bremer, Slide 12 audio on this VT Do not play the Do not Play the audio on this clip!

13 SZMF/ New Materials and Technologies, Bremer, Slide 13

14 SZMF/ New Materials and Technologies, Bremer, Slide 14 Steel making The cooking recipe Basic ingredients Carbon Manganese Silicon Large diameter line pipe Tramp elements Phosphorus Nitrogen Sulphur Microalloys Niobium Titanium Vanadium Add-ons Nickel Copper Chromium Molybdenum Spiral pipes API X70 Basic ingredientsMicroalloysAdd-ons CMnSiNbVTi Σ Ni + Cu + Cr + Mo Standard Novel alloy > 0.10

15 SZMF/ New Materials and Technologies, Bremer, Slide 15 A novel alloying concept: Microstructure & Properties Standard line pipe Large diameter line pipe Novel line pipe Effect of high niobium, low carbon addition Grain refinement if ferrite is present Two phases (acicular ferrite + lower bainite) Elimination of pearlite Many homogenuous distributed precipitations Change of dissolution (re-heating) temperature Conclusions Predominately bainitic microstructure with many precipitations (for example NbC)

16 SZMF/ New Materials and Technologies, Bremer, Slide 16 A novel alloying concept: Microstructure & Properties Large diameter line pipe Strength (Tensile testing) Standard Novel Standard Novel Standard Novel Standard Novel p Conclusions novel strip 30° = novel pipe hoop novel pipe > standard pipe Hot rolling direction

17 SZMF/ New Materials and Technologies, Bremer, Slide 17 A novel alloying concept: Microstructure & Properties Large diameter line pipe Toughness (Impact testing) Hot rolling direction Conclusions novel strip & pipe impact energy > standard strip & pipe impact energy

18 SZMF/ New Materials and Technologies, Bremer, Slide 18 Conclusions for … … the steel producer (less costs) Application of more expensive alloys (for example niobium) Very smooth processing (increased processing temperatures, less wear) Shorter production times leading to capacity increase Benefits of novel steel composition … the spiral pipe mill(competitive advantage) Comparable welding and seam properties Optimised strip quality resulting in less repair work on pipes … the pipe layer (less costs) Less pipe laying equipment necessary Saving of welding material and energy … the gas supplier (increase of efficiency & transmission volume) Higher operating pressures for similar wall thickness Light-weight line pipe design possible Cost reduction

19 SZMF/ New Materials and Technologies, Bremer, Slide 19 Many thanks to our excellent line pipe team from all the divisions involved for their support and help.


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