Carbon dioxide corrosion resistant pipeline steel and manufacturing method thereof

Abstract

The invention provides carbon dioxide corrosion resistant pipeline steel and a manufacturing method thereof. The carbon dioxide corrosion resistant pipeline steel comprises the chemical components of,by mass, 0.02%-0.04% of C, 0.10%-0.50% of Si, 0.90%-1.65% of Mn, 0-0.015% of P, 0-0.003% of S, 0.5%-2.0% of Cr, 0.10%-0.50% of Mo, 0.03-0.08% of Nb, 0.01-0.05% of Ti, 0-0.06% of V, 0-0.50% of Cu, 0-0.50% of Ni, 0-0.22% of Pcm, and the balance Fe and unavoidable impurities. According to the carbon dioxide corrosion resistant pipeline steel and the manufacturing method thereof, the requirement of conventional pipeline steel for the Cr element is broken, the condition is matched with optimization design of other alloy elements at the same time, under the condition of little adding of microalloyelements, through corresponding control of smelting and rolling technology, the pipeline steel with good carbon dioxide corrosion resistance and small anisotropism is obtained, and compared with performance of common X65, the carbon dioxide corrosion rate is lowered by 40% or above.

Description

technical field [0001] The invention relates to the technical field of steel production, in particular to a carbon dioxide corrosion-resistant pipeline steel and a manufacturing method thereof. Background technique [0002] In recent years, with the increasing demand for oil and gas resources, the exploitation of offshore oil and gas fields is increasing. For CO 2 The proportion of oil and gas reservoirs is gradually expanded, containing CO 2 The corrosion of oil and gas to oil and gas wells and pipelines is also becoming more and more prominent. Due to the high cost of laying submarine pipelines, the economic losses caused by accidents and damages are huge. Ordinary carbon steel in high temperature and high pressure CO 2 Under corrosive conditions, the corrosion rate is relatively fast, which cannot meet the needs of use. for CO 2 Corrosion problems, the main protective measures include the use of corrosion-resistant materials, injection of corrosion inhibitors and the...

AI Technical Summary

Problems solved by technology

[0003] Existing research is mostly focused on oil casing, the carbon content of which is above 0.1%, this type of pipe is mostly seamless pipe, heat treatment is required after pipe making, and the production cost is relatively high

In addition, due to the high carbon equivalent of the material itself, it cannot be connected and laid by welding, so the oil casing is connected and laid by thread, which cannot adapt to and meet the requirements of the pipeline

[0004] For steels for low-chromium delivery pipes, more Cu and Ni elements are added, which increases the cost of the alloy, and its applicable conditions are only CO at room temperature and normal pressure. 2 Corrosion, not suitable for CO under high temperature and pressure conditions 2 Corrosion Service Conditions

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