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为了适应英国北海油田钻井平台深海作业的需要,日本钢管公司(NKK)开发研制了一种大径、厚壁、长尺的X70级高强度UoE钢管,用于制作在深海中固定钻井平台的支柱,在实际应用中效果良好。该钢管的规格为:外径812.8mm,壁厚38.1mm、长15m。母材化学成分(wt％)为:C0.08、Si0.25、Mn1.24、P0.006、S0.001、Cu0.17、Ni0.40、Cr0.02、Mo0.05、V0.035、Ti0.008、酸溶A10.027及其他。主要生产工艺过程为钢的冶炼→钢板轧制→UO成形→埋弧焊(SWA)焊管→扩管→淬火回火热处理(QT)→校直→精整。为了能最大限度地抑制钢管变形,在QT热处
In order to meet the needs of deep-sea drilling operations of the North Sea oilfield in the UK, NKK developed a large-diameter, thick-walled and long-length X70-grade high-strength UoE steel pipe for the production of pillars for fixed drilling platforms in the deep ocean , The effect is good in practical application. The specifications of the steel pipe: diameter 812.8mm, wall thickness 38.1mm, length 15m. The base metal chemical composition (wt%) is: C0.08, Si0.25, Mn1.24, P.006, S0.001, Cu0.17, Ni0.40, Cr0.02, Mo0.05, V0.035, Ti0.008, Acid soluble A10.027 and others. The main production process for the smelting of steel → steel rolling → UO forming → submerged arc welding (SWA) pipe → pipe expansion → quenching and tempering heat treatment (QT) → straightening → finishing. In order to minimize the deformation of steel pipe, in the QT heat