VC nanoparticle-strengthened X90 steel plate for plastic pipe, and manufacturing method thereof

Abstract

The invention provides a VC nanoparticle-strengthened X90 steel plate for a plastic pipe, and a manufacturing method thereof. The steel plate comprises the following components in percentage by weight: 0.06%-0.12% of C, 0.10%-0.30% of Si, 0.60%-1.40% of Mn, 0.07%-0.15% of V, 0.001%-0.004% of N, 0.01%-0.04% of Ti, 0.025%-0.045% of Al, not greater than 0.010% of P, not greater than 0.005% of S, 0.10%-0.30% of Cu, 0.10%-0.30% of Mo, 0.10%-0.30% of Cr, 0.10%-0.30% of Ni and the balance Fe and inevitable impurity elements. The manufacturing method comprises the following steps: material preparation, converter or electric furnace smelting, external refining, casting, plate blank reheating, controlled rolling and controlled cooling. The steel plate produced by the manufacturing method meets the various mechanical property requirements of the X90 steel plate for the plastic pipe, and is especially high in low-temperature toughness and anti-HIC property.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a steel plate for an X90-grade oil-gas transport plastic pipe using VC nanoparticles as a reinforcing phase 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 tundra, seismic zone, and desert, long-distance oil and gas pipelines are required to have good plastic deformation capabilities. The typical performance parameters that characterize the plastic deformation ability of pipes are low yield ratio (such as Rt0.5 / Rm≤0.80) and high uniform elongation (such as uEL≥10%). [0003] In order to obtain good plastic deformation ability, two methods are usually adopted: 1) increasing the wall thickness ...

AI Technical Summary

Problems solved by technology

Patents CN101456034A and WO2009125863 provide X70 and X80 pipeline steels based on strain design requirements and their preparation methods. Although they can all obtain high plastic deformation capacity, their organizational structure is F-B type dual-phase structure, which is similar to the single-phase structure of the present invention. significant difference

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