Oceanfit


 

For Challenging Offshore Applications

Vallourec's series of Oceanfit® grades is geared specifically to offshore applications where tubes are exposed to extreme environmental conditions. Besides outstanding mechanical properties and impact toughness at temperatures well below freezing point, these grades possess excellent welding properties. 

 

Applications

Oceanfit® grades are available in three different levels of yield strength/impact toughness combinations, with yield strengths between 690 and 890 MPa and impact toughness down to -50 °C. Depending on the harshness of conditions, Oceanfit® grades can be selected to precisely match application requirements in ship construction, superstructures, jack-up rigs, platform cranes, helicopter decks and housings specifically designed for long-term resistance in challenging project environments. 

 

Product Properties

  • Available in three different yield strength/impact toughness combinations
  • Outstanding mechanical properties with yield strength levels between 690 and 890 MPa
  • Impact toughness at low operating temperatures (down to -50 °C)
  • Weldable by all current manual or automatic methods.
  • Tailor-made to customer needs 

 

Chemical composition (in % by mass)​
​Steel grade C ​Si Mn ​P max. ​S max. ​Cr max. ​Mo ​Ni max. ​N max. ​V ​Al ​Cu max. ​Nb max. Ti max.
​Oceanfit® 690
ImpactFIT 50
​max. 0.20 max. ​0.60 ​​max. 1.70 0.025 0.015 1.50 max. 0.70 1.50 0.020 max. 0.14 ​max. 0.060 ​0.501) 0.05 0.05
​​Oceanfit® 770
ImpactFIT 50
​0.14 to 0.18 ​​0.20 to 0.50 1.20 to 1.70 ​0.025 0.015 max. 0.80 ​0.20 to 0.40 0.40 ​0.020 0.05 to 0.12 ​0.015 to 0.050 ​​0.25 0.05 0.05
​​Oceanfit® 890
ImpactFIT 50
max. 0.18 ​​max. 0.50 ​​​max. 1.50 0.020 0.010 max. 0.90 max. ​0.50 0.40 0.020 max. 0.08 ​​max. 0.050 ​0.35 0.06 0.05

1) If Cu > 0.30 %, Ni has to be at least half of Cu.

 

​Mechanical properties
​Steel grade​ ​Delivery condition1) ​Yield strength
ReH min in MPa2)
​Tensile strength Rm in MPa2) ​Elongation
Amin in %
​Min. average absorbed energy KV in J
long. transv.
​Oceanfit® 690
ImpactFIT 50
​QT 690 ​700 - 960 ​14 ​12 ​27 at -50 °C
​Oceanfit® 770
ImpactFIT 50
QT ​770 ​820 - 1000 ​15 ​13 ​27 at -50 °C
​Oceanfit® 890
ImpactFIT 50
​QT ​890 960 - 1110 ​14 ​12 ​27 at -50 °C

1) QT: quenched and tempered.
2) Valid for the smallest wall thickness range given in the respective material data sheets.

 

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