Rare-earth-containing low-carbon high-alloy anticorrosion oil casing steel and preparation process thereof

Abstract

The invention discloses rare-earth-containing low-carbon high-alloy anticorrosion oil casing steel comprising the following chemical components of, by mass, 0.08%-0.12% of C, 0.15%-0.28% of Si, 0.40%-0.60% of Mn, 1.8%-2.2% of Cr, 0.35%-0.45% of Mo, 0-0.02% of P, 0-0.015% of S, 0.05%-0.07% of V, 0.015%-0.025% of Al and 0.01%-0.02% of RE. A preparation process of the rare-earth-containing low-carbonhigh-alloy anticorrosion oil casing steel is further disclosed. The invention provides a chemical component design method of the high-strength high-toughness H2S / CO2-corrosion-resistant steel for anoil casing, and the material has high hydrogen sulfide corrosion resistance and a match between high strength and high toughness with the reasonable chemical components.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a rare earth-containing low-carbon high alloy 80psi anti-H 2 S / CO 2 Preparation process of corroded oil well pipe. Background technique [0002] h 2 S / CO 2 Corrosion is a common type of corrosion in the world's oil and gas industry, and it is also an important research topic in the field of corrosion and protection. With the CO 2 Corrosion and H 2 The gradual and in-depth study of S corrosion and the gradual solution of corrosion problems in engineering CO 2 and H 2 Corrosion under the coexistence of S has become quite prominent, and the corresponding research on corrosion materials is on the agenda. for H 2 S / CO 2 The protective measures taken for corrosion mainly include the use of corrosion-resistant materials, the addition of corrosion inhibitors and the use of anti-corrosion coatings. However, due to the high long-term investment of corrosion inhibitors and the...

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Problems solved by technology

However, due to the high long-term investment of corrosion inhibitors and the hidden dangers of local corrosion caused by damage to the coating layer during use, the safest protective measure is to use corrosion-resistant materials, so 13Cr and super 13Cr are widely used in corrosion control However, the one-time investment of 13Cr is too large, and the oil and gas fields with low production have defects such as economic benefits and low investment ratio, and the SSC resistance of 13Cr materials in H2S-containing corrosive media still has great shortcomings.

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