RR105 - Review of the performance of high strength steels used offshore
High strength steels are increasingly being used in offshore
structural applications including production jack-ups with
demanding requirements. They offer a number of advantages over
conventional steels, particularly where weight is important. This
review considers the types of steel used offshore, their mechanical
properties, their weldability and their suitability for safe usage
offshore in terms of fracture, fatigue, static strength, cathodic
protection and hydrogen embrittlement performance. It also
addresses the performance of high strength steels at high
temperatures and at high strain rates and outlines the difficulties
in working with the very limited published codes and standards
discussing performance in the field. Current design restrictions
such as limits on yield ratios, susceptibility to hydrogen cracking
including the influence of sulphate reducing bacteria (SRBs) and
the management of the behaviour of such steels in seawater under
cathodic protection conditions are discussed. Makes recommendations
to encourage the wider use of high strength steels in the future
and identifies areas where further study is required.
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