1. Development of Niobium-alloyed large diameter pipes
Titel
27/03/17
Development of Niobium-alloyed large diameter pipes
Sandrine Bremer, Volker Flaxa; Salzgitter Mannesmann Forschung GmbH Franz Martin Knoop; Salzgitter Mannesmann Grossrohr GmbH
London, 7th July 2010
Autor/Bereich

2. Large diameter line pipe
Titel
27/03/17
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
Autor/Bereich

3. Among the top 3 producers of beverage filling und packaging machinery
Titel
27/03/17
Global Presence
Salzgitter Group
The Salzgitter Group is a mid-sized but international company.
Our production facilities for rolled steel are concentrated in Germany, whereas our tube mills and especially the trading activities are located in all relevant areas of the globe.
With the recent acquisition of Klöckner-Werke we expanded our global presence, since Klöckner operates plants in for example India and China!
To say it very clearly: The Salzgitter Group does not go for size in terms of tonnage or turnover.
Our motto is: big enough to serve the needs of international markets, but small enough to react quickly to customer demands.
We are convinced that this philosophy is the basis for the superior performance of our company!
2008: Crude steel production: 6.9 million tons; trading volume: 6.8 million tons
Among the top 3 producers of beverage filling und packaging machinery
Autor/Bereich

4. Group structure and key data FY 2008
Titel
27/03/17
Group structure and key data FY 2008
Salzgitter Group
Salzgitter AG Group
External Sales cons.: € 12.5 billion
Internal Sales: € 3.9 billion
Employees: 23,915
Steel
Tubes
Trading
Services
Technology
Total Sales: € 4.3 billion
External Sales: € 3.0 billion
Employees: 6,949
Total Sales: € 2.9 billion
External Sales: € 2.2 billion
Employees: 5, 929
Total Sales: € 6.3 billion
External Sales: € 5.6 billion
Employees: 1,983
Total Sales: € 1.3 billion
External Sales: € 0.5 billion
Employees: 4,003
Total Sales: € 1.0 billion
External Sales: € 1.0 billion
Employees: 4,907
All data about employees as per 31/12
Autor/Bereich

5. Salzgitter AG Group (Holding)
Titel
27/03/17
Motivation
The line pipe team
Salzgitter AG Group (Holding)
Salzgitter Mannesmann GmbH – Intermediate holding company
Trading
Technology
Steel
Salzgitter Stahl GmbH
Tubes Mannesmannröhren-
Werke GmbH
Tubes Mannesmannröhren-
Werke GmbH
Services
This chart depicts our group structure with five divisions under the roof of a very lean management holding. The operating management is carried out within the individual companies.
In our Steel Division and also the Tubes Division each single company focuses on the production of one product category.
The Trading Division is our link to small and mid-sized domestic customers on the one hand and to the world markets on the other hand. It comprises a complex warehousing trade organization in Europe and a global trading network.
Our Services Division mainly provides the necessary support activities for our producing steel and tubes companies.
Finally, with Klöckner Werke we established the new Technology Division which was expanded recently by the acquisition of the Klöckner PET Technology (the former SIG Beverages Group).
Autor/Bereich

6. High-strength large diameter line pipe
Titel
27/03/17
High-strength large diameter line pipe
Motivation
FBE=Fusion bonded epoxy
EP=Internal epoxy coating
Transport of 51 mio. m3 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
Autor/Bereich

7. High-strength large diameter line pipe
Titel
27/03/17
High-strength large diameter line pipe
Motivation
Autor/Bereich

8. High-strength large diameter line pipe
Titel
27/03/17
Motivation
High-strength large diameter line pipe
Application of high-strength line pipe steels saves resources and costs!
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 [%]
100
Steel grades accor. API 5L:
X X X X90 75 50 25
Autor/Bereich

9. From ore to pipe Large diameter line pipe Steel works Blast furnace
Titel
27/03/17
Large diameter line pipe
From ore to pipe
Continuous Casting
Slab 
Steel works
LD-Converter
Ferro-
Niobium
Alloying
stations 
Alloyed
steel
Blast furnace
 Iron ore
Pig iron 
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
Spiral pipe mill
ø = 508 to 1676 mm
t = 8 to 25 mm
Hochofen (Schachtofenbauweise) zugaben: Reduktion von Eisenerz zu Eisen. Energieträger und Reduktionsmittel=Koks, für Schlakcebildung und Senkung Schmelztemperatur werden Zuschläge (Quarzsand, Kalk) zugegeben.
Autor/Bereich

10. Do not Play the audio on this clip!
Titel
27/03/17
Do not play the
audio on this VT
Do not Play the audio on this clip!
Autor/Bereich

11. Titel
27/03/17
Autor/Bereich

12. Do not Play the audio on this clip!
Titel
27/03/17
Do not play the
audio on this VT
Do not Play the audio on this clip!
Autor/Bereich

13. Titel
27/03/17
Autor/Bereich

14. Steel making „The cooking recipe“
Titel
27/03/17
Steel making „The cooking recipe“
Large diameter line pipe
Basic ingredients
Carbon
Manganese
Silicon
Add-ons
Nickel
Copper
Chromium
Molybdenum
Tramp elements
Phosphorus
Nitrogen
Sulphur
Microalloys
Niobium
Titanium
Vanadium
Spiral pipes
“API X70”
Basic ingredients
Microalloys
Add-ons C Mn Si Nb V Ti
Σ Ni + Cu +
Cr + Mo
Standard
0.11
1.75
0.30
0.05
0.10
0.00
≤ 0.10
Novel alloy
1.80
0.02
> 0.10
Autor/Bereich

15. A novel alloying concept: Microstructure & Properties
Titel
27/03/17
A novel alloying concept: Microstructure & Properties
Large diameter 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
Standard line pipe
Conclusions
Predominately bainitic microstructure with many precipitations (for example NbC)
Novel line pipe
Autor/Bereich

16. A novel alloying concept: Microstructure & Properties
Titel
27/03/17
A novel alloying concept: Microstructure & Properties
Large diameter line pipe
Strength (Tensile testing) p
Standard
Novel
Hot rolling
direction
Standard
Novel
Standard
Novel
Standard
Novel
Conclusions
novel strip 30° = novel pipe hoop
novel pipe > standard pipe
Autor/Bereich

17. A novel alloying concept: Microstructure & Properties
Titel
27/03/17
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
Autor/Bereich

18. Cost reduction … the steel producer (less costs)
Titel
27/03/17
Conclusions for …
Benefits of novel steel composition
… 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
Cost reduction
… 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
Autor/Bereich

19. Titel
27/03/17
Many thanks to our excellent line pipe team from all the divisions involved for their support and help.
Autor/Bereich