Thermomechanically treated…
voestalpine Tubulars GmbH & Co KG
Alpinestrasse 17, 8652 Kindberg-Aumuehl, Austria
T. +43/50304/23-0, F. +43/50304/63-532
[email protected], www.vatubulars.com
…seamless steel tubes…
…produced in one production step…
…with RAPID COOLING TECHNOLOGY…
…offer a wide range of opportunities!
www.toughtubes.com
•
•
improved weldability (low CEQ)
high strength (yield strength, tensile strength, hardness)
in combination with excellent toughness (high impact energy
absorption)
• good cold forming properties
• improved surface quality
• extremely fine grain size
microstructure
normalized rolling
normalized rolling with
rapid pipe cooling
The diagram demonstrates how material properties can be influenced
by the production process. Thermomechanical treatment in combination with rapid cooling technology offers a wide range of opportunities at lower CEQ and therefore improved weldability.
1000
ToughTubes
temperature controlled
rolling with rapid pipe
cooling
800
700
TM + RPC
600
500
400
TM
N
300
0,32
0,36
0,40
0,44
0,48
0,52
carbon equivalent CEQ (in wt.-%)
N = normalized rolled
TM = thermomechanically rolled
TM + RPC = thermomechanically rolled + rapid pipe cooling
Fields of application
Responding to customer’s material property requirements voestalpine
Tubulars can produce seamless steel tubes by one of the following
three production methods.
Possibilities to improve the strength
of steel - chemistry used contained
0.18%C, 1.4%Mn, 0.04%Nb, 0.08%V
900
200
Comparison of the results
applying different processes
1000
900
800
700
600
500
400
300
200
100
0
normalized
rolling
Yield strength Rp,0.2% [MPa](L)
Tensile strength Rm [MPa](L)
Elongation [%](R)
CHV450 - avarge value [J](L)
normalized
rolling with rapid
pipe cooling
ToughTubes
temperature controlled
rolling with rapid
pipe cooling
50
45
40
35
30
25
20
15
10
5
0
elongation [%]
The following high strength seamless steel tube requirements can be
achieved with ToughTubes:
How material properties are influenced by
the rolling process
strength [MPa], absorbed energy [J/cm2]
ToughTubes – thermomechanically treated seamless steel tubes –
offer a wide range of opportunities. High strength, excellent toughness, improved weldability. These are only a few desirable properties
which can be achieved with thermomechanical treatment.
Through accurate control of temperature and forming parameters
material characteristics can be generated, which are not achievable
with conventional production technologies, e.g. the optimal combination of high strength and excellent toughness.
Why ToughTubes?
Yield Strength RP,0,2% [MPa]
ToughTubes
ToughTubes is the right choice when improved weldability,
high strength in combination with excellent toughness, good
cold forming properties and improved surface quality are
required.
ToughTubes can be used as…
• High strength Line Pipe
• Mechanical Tubes
• Automotive products
ToughTubes’ product properties offer a wide range of
applications.
www.toughtubes.com