Nbc nano-particle reinforced steel plate for X90 plastic pipes and manufacturing method of steel plate

Abstract

The invention provides an Nbc nano-particle reinforced steel plate for X90 plastic pipes and a manufacturing method of the steel plate. The steel plate comprises, 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 Nb, 0.01-0.004% 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, 010-0.30% of Cr, 0.10-0.30% of Ni and the balance being Fe and other inevitable impurity elements. The manufacturing method includes the steps of preparing of materials, smelting in converter or electric furnace, external refining, casting, reheating of plates, controlled rolling and controlled cooling. The steel plate produced by the method has good plastic deformation capacity, and can guarantee safety of oil and gas transmission pipelines laid in zones with complex geological conditions.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a steel plate for X90 grade oil and gas transportation plastic pipes using NbC 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 th...

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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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