Low-cost anti-HIC oil and gas pipeline L290 hot-rolled steel plate and manufacturing method thereof

Abstract

The invention discloses a low-cost anti-HIC L290 hot-rolled steel plate for an oil and gas pipeline and a manufacturing method of the low-cost anti-HIC L290 hot-rolled steel plate. The low-cost anti-HIC L290 hot-rolled steel plate comprises the following chemical components in percentage by weight: 0.03%-0.042% of C, 0.10%-0.20% of Si, 0.30%-0.50% of Mn, 0.08%-0.15% of Cu, less than or equal to 0.010% of P, less than or equal to 0.005% of S, 0.035%-0.055% of Nb, 0.015%-0.0250% of Ti, 0.015%-0.045% of Al, 0.004%-0.006% of N and the balance of Fe and inevitable impurities. The manufacturing method is used for manufacturing the L290 steel-grade longitudinal welded pipe for the HIC-resistant oil and gas pipeline with the diameter of 10-25 mm and the diameter phi of 914 mm or below. And 2-10 nm Cu-rich and Nb-rich nano precipitated phases are distributed in the structure in a dispersed mode, the comprehensive performance is good, and the service safety of oil and gas pipelines is guaranteed.

Description

technical field [0001] The invention relates to the technical field of low-carbon microalloy steel production, in particular to a low-cost HIC-resistant L290 hot-rolled steel sheet for oil and gas pipelines and a manufacturing method. Background technique [0002] Pipeline transportation is the most economical, most convenient and most important way of transporting natural gas over long distances. In order to reduce the construction investment, operation and maintenance costs of long-distance natural gas transmission pipelines and improve the transmission efficiency, long-distance oil and gas transmission pipelines are developed in the direction of large diameter and high pressure; at the same time, in order to ensure their service economy and safety, some branch line projects The strength of the steel pipe is gradually decreasing, and the thickness is gradually increasing. The corresponding pipeline steel plate must meet the requirements of wall thickness (10-25mm), pipe di...

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Problems solved by technology

[0006] Although the steels disclosed in the above patent documents have high strength and toughness, they are either coiled plates, or have high Mn content, or are aimed at conventional natural gas pipeline steels, so they are not suitable for the production of steel plates for HIC-resistant pipelines, etc.

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