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Production method for X80 grade pipeline steel resistant to hydrogen-induced cracking (HIC)

A technology of anti-hydrogen-induced cracking and production method, which is applied in the field of metal materials, can solve the problems of increased susceptibility to hydrogen-induced cracking of X80 pipeline steel, and achieve the effect of improving HIC resistance and good mechanical properties

Active Publication Date: 2018-05-01
武汉钢铁有限公司
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Problems solved by technology

[0008] The disadvantage of the above two invention patent applications is that in order to compensate for the reduction in the strength of the steel caused by ultra-low carbon, the manganese content is relatively high. Therefore, it has brought about the technical problem of increased hydrogen-induced cracking (HIC) sensitivity of X80 pipeline steel

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  • Production method for X80 grade pipeline steel resistant to hydrogen-induced cracking (HIC)
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  • Production method for X80 grade pipeline steel resistant to hydrogen-induced cracking (HIC)

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Embodiment Construction

[0040] In order to better explain the present invention, the main content of the present invention is further clarified below in conjunction with specific examples, but the content of the present invention is not limited to the following examples.

[0041] The production method of X80 grade pipeline steel resistant to hydrogen-induced cracking of the present invention comprises the technological process of converter smelting, vacuum Si-Ca treatment, pouring into slab, heating of slab, rough rolling, finish rolling, cooling and crimping, among which It is characterized in that: the composition and mass percentage of the cast slab are: C: 0.02-0.04%, Si: 0.20-0.23%, Mn: 0.60-0.80%, Cu: 0.20-0.30%, Cr: 0.30-0.45% , Mo: 0.20~0.25%, Nb: 0.03~0.05%, V: 0.02~0.03%, Ti: 0.01~0.02%, P≤0.005%, S≤0.002%, the balance is Fe and unavoidable impurities;

[0042] The heating temperature of the slab is 1200-1250°C;

[0043] The starting temperature of rough rolling is 1000-1050°C, and the end...

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Abstract

The invention discloses a production method for X80 grade pipeline steel resistant to hydrogen-induced cracking (HIC), and belongs to the technical field of metal materials. The production method forthe X80 grade pipeline steel resistant to HIC includes the technical processes of converter smelting, vacuum Si-Ca processing, casting into ingot blanks, ingot blank heating, rough rolling, precisionrolling, cooling and curling. The components of the ingot blanks include, by mass percentage, 0.02-0.04% of C, 0.20-0.23% of Si, 0.60-0.80% of Mn, 0.20-0.30% of Cu, 0.30-0.45% of Cr, 0.20-0.25% of Mo,0.03-0.05% of Nb, 0.02-0.03% of V, 0.01-0.02% of Ti, 0.005% or less of P, 0.002% or less of S, and the balance Fe and unavoidable impurities. The ingot blank heating temperature, rough rolling temperature, precision rolling temperature and cooling mode are controlled, and the X80 grade pipeline steel with low cost and good HIC resistance is prepared.

Description

technical field [0001] The invention relates to pipeline steel, which belongs to the technical field of metal materials, in particular to a production method of X80 grade pipeline steel resistant to hydrogen-induced cracking and corrosion. Background technique [0002] Since the beginning of the 21st century, with the adjustment of the global energy structure, the demand for oil and natural gas has increased day by day. at the same time. Long-distance pipelines for oil and natural gas are also developing in the direction of high-grade steel, high pressure, and large diameter. Steel for long-distance pipelines not only requires high strength, high toughness and good weldability, but also requires good resistance to hydrogen-induced cracking (HIC). [0003] Hydrogen-induced cracking refers to the metal material containing H 2 In the medium environment of S, because the hydrogen atoms precipitated during the electrochemical corrosion process enter the interior of the materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/20C22C38/22C22C38/26C22C38/24C22C38/28C21D8/02C21C7/064
Inventor 郎丰军黄先球庞涛王辉徐锋李安平李利巍崔雷彭浩
Owner 武汉钢铁有限公司
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