Strain design region based high-performance pipeline steel with high-deformation resistance and preparation method

Abstract

The invention discloses strain design region based high-performance pipeline steel with high-deformation resistance and a preparation method and belongs to the technical field of high-strength pipeline steel. The chemical composition of the pipeline steel comprises components in percentage by weight as follows: 0.04%-0.07% of C, 0.02%-0.05% of Nb, 0.10%-0.30% of Si, 1.00%-1.60% of Mn, 0.01%-0.05% of Alt, 0.015%-0.025% of Ti, 0.15%-0.40% of Ni, 0.10%-0.30% of Cr, 0.10%-0.30% of Cu, smaller than or equal to 0.012% of P, smaller than or equal to 0.003% of S, smaller than or equal to 0.005% of N, smaller than or equal to 0.002% of O, smaller than or equal to 0.004% of B and the balance of Fe and inevitable impurities, wherein the content of C and Nb is 0.08%-0.10%, the content of Cr and Cu is 0.20%-0.40%, and the content of P, S, N, O and B is smaller than or equal to 0.016%. The high-performance pipeline steel has the advantages of excellent high-deformation resistance, low-temperature toughness, CTOD (crack tip opening displacement) fracture toughness and acid resistance.

Description

technical field [0001] The invention belongs to the technical field of high-strength pipeline steel, and in particular relates to a high-performance large-deformation-resistant pipeline steel for strain-based design areas and a preparation method, which has excellent large-deformation resistance, low-temperature toughness, CTOD fracture toughness, and acid resistance. As well as large deformation resistant pipeline steel with excellent weldability, it is suitable for oil and gas pipeline construction in strain-based design areas. Background technique [0002] With the rapid development of oil and natural gas resources, the exploitation of oil and gas fields in the world is developing in harsh environments such as remote deserts, seismic zones, polar tundra and oceans, and the pipelines are inevitably subjected to complex and changeable geological disaster environments. Seriously affected the safe operation of the pipeline. In order to ensure the economy and safety of pipeli...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a high-performance large-deformation-resistant pipeline steel for strain-based design areas and its preparation method. The product has excellent large-deformation resistance and low-temperature toughness, and solves the CTOD fracture toughness of the existing large-deformation-resistant pipeline steel. , acid resistance and weldability, suitable for on-site girth weld welding of semi-automatic flux cored self-shielded welding process

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