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The development of low alloy steels for offshore applications has generally led to the selection of increasingly “leaner” chemistries which are tailored to meet specific design requirements. Low carbon, low alloy, copper bearing steels based on the ASTM A707 grade system have attracted considerable interest for applications combining high strength and toughness with good weldability. Forgemasters Steel and Engineering has been intimately involved in the development of A707 variants which has led to contracts for the production of forged components for the Auger and Mars platforms. A thorough review of structure property relationships with regard to the role of copper precipitation during ageing, has been undertaken. Comparisons have been drawn with conventional low carbon, low alloy steels where similar properties are achieved with tempered bainitic microstructures.
copper bearing steels, offshore, tension leg platform, weldability, low alloy steel
Product Metallurgist, Forgemasters Steel and Engineering, Sheffield,
Technical Director (Designate), Forgemasters Steel and Engineering, Sheffield,