Subsea Structures



Subsea equipment and systems are often installed in cage-like steel frame structures for protection as well as for easy setup and maintenance of the system components. Systems and environments using subsea structures include

  • Processing and boosting systems
  • Manifolds
  • Trees
  • Active pipeline supports
  • ROV operated bending tools
  • Dynamically loaded key structural elements with 3-axial complex stress distribution



Construction materials used in subsea frame structures has to perform reliably under the demanding conditions of subsea applications. Mechanical, technological and geometric characteristics have to meet and even exceed defined standards to ensure the cost-effective construction, durability and safe operation of subsea systems.


Products and Solutions

Features of MSH sections that are highly relevant in the application environment of subsea structures include heavy wall thicknesses, extremely high yield strength, good impact toughness at low temperatures, tight tolerances and excellent welding properties.


Product Information

  • MSH sections standard grades according to EN 10210, EN 10225 and NORSOK STANDARD M-120
  • Standard and special grades for subsea and offshore equipment: S355G15+N, S355G14+N, S355G13+N, S355NH, Oceanfit® 690 ImpactFIT 50, Oceanfit® 770 ImpactFIT 50 and Oceanfit® 890 ImpactFIT 50 for the highest impact toughness at temperatures down to -50 °C


Product Properties

MSH Features and Advantages

  • A wide range of specific grades for an optimal strength/weight ratio
  • Hot finished solutions for sizes up to 500 x 300 and 400 x 400 mm including heavy wall thicknesses
  • High load capacity, high static values and impact toughness down to -50°C
  • Extremely high yield strength
  • Homogeneous material properties through the cross section: low internal stress and easy processing
  • Tight corner radii (up to 1 x T on request) for reduced welding material and processing requirements
  • Extremely tight tolerances
  • Multi-certified i.e. to NORSOK STANDARD M-120, EN 10210, EN 10225
  • Production, testing and third party inspection for customer specific solutions on request