A high-strain steel plate for high-homogeneity l485 marine line pipe and its manufacturing method

Abstract

The invention provides a high-strain steel plate for high-homogeneity L485 marine line pipe and its manufacturing method. The composition of the steel plate is as follows by weight percentage: C 0.02%-0.08%, Si 0.10%-0.40%, Mn 1.40%-1.80% , Nb 0.02%~0.08%, V 0.01%~0.05%, Ti 0.01%~0.04%, Al 0.025%~0.045%, P≤0.010%, S≤0.005%, Cu 0.10%~0.50%, Mo 0.02~0.40 %, Cr 0.06% to 0.45%, Ni 0.10% to 0.50%, and the rest are Fe and unavoidable impurity elements. The manufacturing method includes molten steel smelting → out-of-furnace refining → casting → slab reheating → controlled rolling → controlled cooling → heat treatment → air cooling to room temperature; the application of the invention realizes the L485 high-homogeneity steel plate for marine pipes with excellent low-temperature toughness and high strain performance cost-effective production.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a high-strain steel plate for high-homogeneity L485 marine line pipe and a manufacturing method thereof. Background technique [0002] With the rapid development of the global economy, the consumption of oil and gas resources in various countries has increased sharply, and land resources have been gradually depleted, resulting in the focus of oil and gas exploitation shifting to the sea. As a country with a vast territorial sea, in order to safely and effectively utilize submarine oil and gas resources, especially deep-sea oil and gas resources, it is of great significance to develop steel materials for submarine oil and gas transportation. [0003] As we all know, the movement of ocean currents is complex and changeable, and the geological conditions of the seabed are harsh. Oil and gas pipelines serving under such working conditions need to have the characteristics of...

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