A kind of x80 anti-large deformation pipeline steel and its manufacturing method

Abstract

The invention discloses X80 large deformation resisting pipeline steel and a manufacturing method. The steel comprises the following chemical components in percentage by mass: 0.04-0.09% of C, 0.15-0.55% of Si, 1.50-1.75% of Mn, 0.04-0.10% of Nb, 0.02-0.08% of V, 0.01-0.03% of Ti, 0.15-0.55% of Cu, 0.15-0.55% of Ni, 0-0.15% of Cr, 0.15-0.45% of Mo, 0.025-0.045% of Al, 0.0002-0.011% of N, P not more than 0.015%, S not more than 0.005%, and the balance of Fe and inevitable impurity elements. The manufacturing method adopts the process route of: material preparation-converter or electric furnace smelting-furnace external refining-casting-plate blank reheating-control rolling-control cooling; and the tempering process is adopted or not adopted after two-phase area quenching. Compared with the prior art, the steel has such advantages as lower yield ratio, higher uniform ductility, better toughness matching, low identical plate performance difference of steel plates, high thickness direction structure uniformity and low belt-shaped grade.

Description

technical field [0001] The invention belongs to the technical field of pipeline steel, relates to an X80 large deformation resistant pipeline steel and a manufacturing method, in particular to an X80 large deformation resistant pipeline wide and thick plate prepared by a two-phase zone quenching method and a preparation method thereof. The wide and thick plates for pipelines prepared by applying the invention can be applied to the manufacture of large-diameter longitudinally submerged arc welded pipes for areas based on strain design. Background technique [0002] With the increasing demand for oil and gas resources, the investment and construction of new oil and gas fields are gradually increasing. Because the production and consumption areas of oil and gas often need to pass through areas with harsh geological conditions such as permafrost and seismic zones, long-distance oil and gas pipelines need to meet the requirements of strain-based design: the lateral performance of...

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Problems solved by technology

[0008] The object of the present invention is to provide a kind of X80 anti-large deformation pipeline steel and its preparation method, in order to solve the deficiencies in the production of large deformation resistance pipeline steel by the current TMCP process, such as large difference in performance between the same plate and high band structure level, etc. At the same time, we will further produce wider and thicker plates for strain-based design areas with higher thickness specifications to meet the requirements of wider and thicker plates for large-deformation-resistant pipeline steels of X80 and above

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