X52 seamless pipeline tube having HIC resistance and manufacturing method thereof

Abstract

The invention provides an X52 seamless pipeline tube having HIC resistance and a manufacturing method thereof. The X52 seamless pipeline tube comprises the following components in percentage by weight: 0.08-0.16% of C, 0.2-0.4% of Si, 1.0-1.6% of Mn, 0.01-0.04% of Ti, 0.03-0.08% of V, 0.20-0.30% of Cu, 0.15-0.25% of Ni, less than or equal to 0.015% of P, less than or equal to 0.010% of S and the balance of iron and unavoidable impurities. The manufacturing method comprises the following steps: heating a tube billet obtained by hot rolling to 1200 DEG C-1300 DEG C by virtue of an annular furnace, carrying out continuous rolling method by virtue of an MPM, carrying out quenching and tempering heat treatment and carrying out strip temperature straightening at a temperature not less than 400 DEG C. By screening and matching alloying elements and carrying out heat treatment method of quenching and tempering, the HIC resistance of the tube is improved, the grain structure is uniform, good impact toughness is achieved and the manufacturing method is easily implemented.

Description

technical field [0001] The invention belongs to the field of corrosion-resistant materials and seamless steel pipes, and in particular relates to an X52 seamless line pipe with HIC resistance and a manufacturing method thereof. Background technique [0002] Pipeline transportation is a large-scale transportation method of oil and natural gas. The characteristics of pipeline transportation are economical, efficient, safe and uninterrupted. Seamless line pipe is mainly used to transport high-pressure oil and gas near the wellhead of oil well or gas well. It is a steel pipe without weld seam manufactured by seamless pipe production method. Hydrogen sulfide (H2S) contained in petroleum and natural gas products in my country 2 S) concentration is higher, the hydrogen sulfide produced is more corrosive, and it is one of the most corrosive and harmful media in oil and natural gas. h 2 Hydrogen-induced cracking (HIC) in pipes caused by S corrosion is one of the main causes of pi...

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Problems solved by technology

[0005] "High-strength stainless steel pipe with excellent corrosion resistance for line pipe and its manufacturing method" (publication number: CN1875121), this patent introduces that the pipe is cooled to room temperature at a cooling rate higher than the air cooling rate after rolling, and adopts quenching + tempering Heat treatment method, the line pipe has a yield strength above 413MPa, good thermal workability and corrosion resistance in harsh environments, the disadvantage is that it is mainly aimed at 2 and Cl - It is used in a corrosive environment with a high temperature of 150°C, and it is a stainless steel tube

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