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Development Of Ultra-high Strength Linepipes With Dual-phase Microstructure For High Strain Application

机译：具有高应变应用的具有双相微结构的超高强度管道的开发

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摘要

Extensive studies have been conducted to develop high strength linepipes with higher deformability. One of the key technologies for improving deformability is dual-phase microstructural control. Steel plate with ferrite-bainite microstructure can be obtained by applying thermo-mechanical controlled processing (TMCP), a process of controlled rolling and accelerated cooling. Low carbon, boron-free steels were used to enable the ferrite formation during cooling after controlled rolling, and accelerated cooling with an ultimate cooling rate enhanced the strength up to the X120 grade. HOP~R (Heat-treatment On-line Process) was also applied after accelerated cooling in order to improve the Charpy energy of the base material. Trial production of X120 high deformability linepipe was conducted by applying dual-phase microstructural control. Microstructural and mechanical properties of X120 linepipe are introduced in this paper.
机译：已经进行了广泛的研究以开发具有较高可变形性的高强度管道。改善可变形性的关键技术之一是双相微结构控制。可以通过应用热机械控制处理（TMCP），控制轧制和加速冷却的过程来获得具有铁素体-贝氏体组织的钢板。低碳，无硼的钢被用于在受控轧制后的冷却过程中形成铁素体，并且以最终冷却速率进行的加速冷却将强度提高到X120级。加速冷却后还应用了HOP〜R（热处理在线工艺），以提高基材的夏比能量。 X120高变形管线管的试生产是通过应用双相微结构控制进行的。本文介绍了X120管道的显微组织和力学性能。

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