A new material for large offshore structures was developed. The new process involves hollow-input making, forging, normalizing/tempering, and final machining. Tests were conducted using full-size models measuring 48 inches in outside diameter (00), 4 inches in wall thickness (WT), and 220 inches in length. Test results show that the new heavywall forged pipe improved the reliability of node cans for offshore structures, such as oil exploration and production platforms.With offshore structures becoming larger and larger in size, the reliability of their structural members, particularly nodes, takes on increased signif icance. The heavywall forged pipe made from newly developed hollow steel ingots will contribute to the construction of large offshore structures, especially because hollow ingots can be produced in large unit weights of up to 140 tons.
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