A kind of V-containing large deformation x80m pipeline steel plate and its manufacturing method

Abstract

The invention provides a V-containing large-deformation X80M pipeline steel plate and a manufacturing method thereof. The steel plate comprises the following components by weight in percentage: 0.02%-0.09% of C, 0.05%-0.40% of Si, 1.55%-1.95% of Mn, 0.05%-0.35% of Cu, 0.05%-0.35% of Cr, 0.05%-0.35% of Ni, 0.05%-0.35% of Mo, 0.036%-0.100% of Nb, 0.01%-0.07% of V, 0.010%-0.025% of Ti, 0.01%-0.04% ofAl, smaller than or equal to 0.010% of P, smaller than or equal to 0.005% of S and the balance Fe and a plurality of inevitable impurity elements. The manufacturing method comprises the steps of converter or electric furnace smelting, external refining, casting, reheating, controlled rolling and controlled cooling. The production cost is effectively reduced. Meanwhile, various mechanical propertyrequirements of the large-deformation X80M steel pipe can be met after the steel plate is manufactured into a steel plate. The low-temperature toughness is particularly good.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a hot-rolled steel plate for X80M grade oil and gas pipelines with V-containing large deformation and a manufacturing method thereof. 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. Since the production and consumption of oil and gas often need to pass through areas with harsh geological conditions such as permafrost zones and seismic zones, long-distance oil and gas pipelines are required to meet the requirements of strain-based design: the transverse performance of steel pipes meets the requirements of traditional stress-based design, Longitudinal properties are characterized by resistance to large deformations. The typical performance parameters characterizing the resistance to large deformation are low yield ratio (such as Rt0.5 / Rm≤0.80) and high ...

AI Technical Summary

Problems solved by technology

Under low temperature and high pressure, the load on the rolling mill is heavy, and there are many restrictions in the production of wide and thick plates

[0005] At present, there are few public documents on the production of large deformation pipeline steel by using TMCP method and adding V elements

Patent CN201410480781.9 provides an X80 grade anti-large deformation pipeline steel plate and its manufacturing method. This method uses two water-cooling processes with different cooling rates, and the water-cooling process is complicated

[0006] Invented "A Large Strain X80HD2 Pipeline Steel Pipe and Steel Plate for Pipeline Steel Pipe" (CN201610425241.X), "High Performance Large Deformation Resistance Pipeline Steel for Areas Based on Strain Design and Its Preparation Method" (CN201510674487.6) provided the steel plate production method for pipelines , requires 2 passes of not less than 20% of the rough rolling single pass reduction, the load of the rolling mill is large, it is not suitable for the production of wide and thick plates

[0007] Patents JP2009161824, JP2009174020, "A large deformation resistant pipeline steel with excellent aging resistance and its production method" (CN201110054270.7), "a large deformation resistant pipeline steel prepared by heat treatment method and its preparation method" (CN201010266539. 3) Invention of "X70 Large Deformation Resistant Pipeline Steel and Its Manufacturing Method" (CN201510338315.1), "X80 Large Deformation Resistant Pipeline Steel and Its Manufacturing Method" "CN201510336908.4" discloses the need for large deformation production technical solutions Using heat treatment method, the production efficiency is low and the production cost is high

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