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

A technology of anti-large deformation and pipeline steel, applied in the field of pipeline steel, which can solve the problems of high band structure level and large difference in performance of the same plate

Active Publication Date: 2018-08-31
ANGANG STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 be

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

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Embodiment Construction

[0043] The invention relates to an X80 steel for large-deformation-resistant pipelines, wherein the mass percentages of chemical components in the steel are C 0.04%-0.09%, Si 0.15%-0.55%, Mn 1.50%-1.75%, Nb 0.04%-0.10%, V 0.02%-0.08%, Ti0.01%-0.03%, Cu 0.15%-0.55%, Ni 0.15-0.55%, Cr 0-0.15%, Mo 0.15%-0.45%, Al0.025%-0.045%, N 0.0002%-0.011%, P≤0.015%, S≤0.005%, the rest are Fe and other inevitable impurity elements.

[0044]The target structure of the large deformation-resistant pipeline steel plate in the present invention is composed of two phases with obvious differences in hardness, wherein the soft phase is ferrite, including polygonal ferrite, quasi-polygonal ferrite, or any mixture thereof; the hard phase is ferrite Tensite, MA component, martensite, or any mixture thereof; the volume fraction of ferrite is 40%-60%; the average diameter of ferrite grains is 4-10um.

[0045] The TMCP hot-rolled steel sheet used in the X80 anti-large deformation pipeline steel in the pre...

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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...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C33/04C21D8/00
Inventor 刘文月任毅张禄林高红王爽张帅应传涛刘浩岩
Owner ANGANG STEEL CO LTD
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