Steel for X52 longitudinal welded pipe for thick-wall anti-HIC oil and gas pipeline and manufacturing method

A technology for oil and gas pipelines and straight seam welded pipes, applied in the field of low-carbon micro-alloy steel production, can solve the problems of not being suitable for the production of thick steel plates for HIC-resistant oil and gas pipelines, improve the pass rate of flaw detection, reduce the level of central porosity, and increase the pressure The effect of lower volume

Active Publication Date: 2022-07-12
ANGANG STEEL CO LTD
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  • Claims
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Problems solved by technology

[0009] Although the steels disclosed in the above patent documents have high strength and toughness, they are either coiled plates or steels for natural gas pipelines, so they are not suitable for the production of thick gauge anti-HIC oil and gas Steel plates for pipelines, etc.

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  • Steel for X52 longitudinal welded pipe for thick-wall anti-HIC oil and gas pipeline and manufacturing method
  • Steel for X52 longitudinal welded pipe for thick-wall anti-HIC oil and gas pipeline and manufacturing method
  • Steel for X52 longitudinal welded pipe for thick-wall anti-HIC oil and gas pipeline and manufacturing method

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Embodiment Construction

[0040] The following embodiments are used to specifically illustrate the content of the present invention, and these embodiments are only general descriptions of the content of the present invention, and do not limit the content of the present invention.

[0041] Wherein Table 1 is the chemical composition of the embodiment steel, Table 2 is the smelting process system of the embodiment steel, Table 3 is the heating system of the slab of the embodiment steel and the high-pressure water descaling process before the continuous casting slab rolling; Table 4 is the implementation The rolling parameters of the example steel; Table 5 is the reduction amount of each pass in different rolling stages of the example steel; Table 6 is the main process parameters of the controlled cooling of the example steel; Table 7 is the transverse mechanical properties of the example steel.

[0042] Table 1 Chemical composition (wt, %) of the embodiments of the present invention

[0043] Exa...

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Abstract

The invention discloses steel for an X52 straight welded pipe for a thick-wall HIC-resistant oil and gas pipeline and a manufacturing method of the steel. The steel comprises the following chemical components in percentage by weight: 0.033%-0.045% of C, 0.12%-0.27% of Si, 0.40%-0.60% of Mn, 0.025%-0.04% of Zr, 0.15%-0.25% of Cu, less than or equal to 0.010% of P, less than or equal to 0.005% of S, 0.045%-0.065% of Nb, 0.015%-0.0250% of Ti, 0.015%-0.045% of Al, 0.025%-0.045% of Mo, 0.04%-0.06% of Ni, 0.004%-0.006% of N and the balance of Fe and impurities. The alloy has high strength and high toughness, 2-10 nm of Cu-rich, Nb-rich and Zr-rich nano precipitated phases are dispersed and distributed in the structure, and the alloy has good comprehensive performance.

Description

technical field [0001] The invention relates to the technical field of production of low-carbon microalloyed steel, in particular to a steel for X52 straight seam welded pipe for HIC oil and gas pipelines with thick-walled low yield strength ratio 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 recent years, with the rapid development of pipeline engineering, the production of pipeline steel has been greatly increased, and the production of pipeline steel has developed rapidly. Among them, X52 grade pipeline steel is a common steel grade for pipeline engineering, especially branch line engineering, and its production technology has been greatly developed. Increasing the transmission pressure of branch lines is an important measure to improve the efficiency of oil and gas transportation in urban pipelines; however, it must be pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/14C22C38/16C22C38/12C22C38/06C22C38/08C21D8/02C21C1/02C21C7/064C21C7/10
CPCC22C38/02C22C38/04C22C38/14C22C38/16C22C38/12C22C38/06C22C38/08C21D8/0226C21C1/02C21C7/064C21C7/10C21D2211/005C21D2211/009C21D2211/004
Inventor 徐海健沙孝春康超闵承鑫乔馨杨雨泽
Owner ANGANG STEEL CO LTD
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