Nbc nanoparticle reinforced X80 plastic pipe steel plate and production method thereof

Abstract

The invention provides an Nbc nanoparticle reinforced X80 plastic pipe steel plate and a production method of the Nbc nanoparticle reinforced X80 plastic pipe steel plate. The steel plate comprises, by weight percentage, 0.06%-0.12% of C, 0.10%-0.30% of Si, 0.60%-1.40% of Mn, 0.07%-0.15% of Nb, 0.001%-0.004% of N, 0.01%-0.04% of Ti, 0.025%-0.045% of Al, not larger than 0.010% of P, not larger than0.005% of S, not larger than 0.30% of Cu, not larger than 0.30% of Mo, 0.12%-0.30% of Cr, 0.12%-0.30% of Ni and the balance Fe and inevitable impurity elements. The production method comprises the steps of material preparation, converter or electric furnace smelting, secondary refining, casting, slab reheating, controlled rolling and controlled cooling. By the adoption of the produced steel plate, the safety of oil and gas transmission pipelines laid in geological complex areas is ensured, and the purposes of high-pressure transportation of natural gas and oil and the like are met.

Description

technical field [0001] The invention belongs to the field of metal materials, in particular to a steel plate for X80 plastic pipes 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 of the pipe; 2) increasing the volume fraction of the high plastic phase in the pipe...

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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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