Subsea pipeline steel plate coil with excellent low-temperature CTOD performance and production process thereof

Abstract

The invention discloses a subsea pipeline steel plate coil with an excellent low-temperature CTOD performance and a production process thereof, and belongs to correlation technique field of subsea oiland gas conveying pipelines. The subsea pipeline steel plate coil with the excellent low-temperature CTOD performance comprises the following chemical components in percentage by mass: 0.030 percentto 0.070 percent of C, 0.10 percent to 0.20 percent of Si, 1.10 percent to 1.60 percent of Mn, 0.020 percent to 0.050 percent of Nb, 0.020 percent to 0.040 percent of V, 0.010 percent to 0.030 percentof Ti, 0.10 percent to 0.20 percent of Mo, less than or equal to 0.06 percent of Alt, less than or equal to 0.008 percent of S, less than or equal to 0.018 percent of P, and the balance Fe and inevitable impurity elements. On the premise of meeting the performance requirements of subsea pipeline steel, through the design of corresponding technological steps and the design of relevant technological parameters, the subsea pipeline steel plate coil has the excellent CTOD performance.

Description

technical field [0001] The invention belongs to the technical field related to submarine oil and gas transmission pipelines, and in particular relates to a steel plate coil for submarine pipelines with excellent low-temperature CTOD performance and a production process thereof. Background technique [0002] Since the submarine pipeline has served in the complex ocean environment for a long time, it is not only subject to environmental loads such as wave flow outside the pipeline, seabed scouring and sedimentation, slip transition, etc., as well as corrosion and pressure of the fluid inside the pipeline, but also to accidents such as impacts from falling objects on the sea and dragging fishing nets. The effect of the load. Some pipelines have suspension, plane displacement, pipe body damage, etc. The hidden dangers of these pipelines pose a great threat to the environment and production. Therefore, steel for submarine pipelines is required to have higher low-temperature crack...

AI Technical Summary

Problems solved by technology

[0011] Aiming at the problem of poor CTOD performance of existing submarine pipeline steel coils, the present invention provides a submarine pipeline steel coil with excellent low-temperature CTOD performance, which greatly improves the CTOD performance on the premise of meeting the performance requirements of submarine pipeline steel

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