A kind of high-strength low-hardness hydrogen sulfide corrosion-resistant steel and its preparation method

A hydrogen sulfide-resistant, low-hardness technology, applied in the field of steel preparation, can solve the problems of increased hardness, low hardness, and high strength of hydrogen sulfide-resistant steel, so as to achieve low hardness, improve service life and safety, and excellent Effect of Hydrogen Sulfide Corrosion Resistance

Active Publication Date: 2022-04-19
SHOUGANG CORPORATION
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  • Claims
  • Application Information

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Problems solved by technology

The strength and hardness of the material are related. To obtain high strength, the hardness will increase to a certain extent.
[0005] At present, the domestic hydrogen sulfide corrosion-resistant steel cannot meet the requirements of high strength, low hardness and excellent hydrogen sulfide corrosion resistance at the same time.

Method used

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  • A kind of high-strength low-hardness hydrogen sulfide corrosion-resistant steel and its preparation method
  • A kind of high-strength low-hardness hydrogen sulfide corrosion-resistant steel and its preparation method
  • A kind of high-strength low-hardness hydrogen sulfide corrosion-resistant steel and its preparation method

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preparation example Construction

[0048] According to another typical embodiment of the present invention, the present invention also provides a preparation method of the high-strength low-hardness hydrogen sulfide corrosion-resistant steel, the preparation method comprising:

[0049] obtaining the cast slab of the high-strength, low-hardness hydrogen sulfide corrosion-resistant steel, the total compression ratio of the cast slab is ≥10;

[0050] The slab is heated before rolling, rolled and cooled after rolling to obtain high-strength and low-hardness hydrogen sulfide corrosion-resistant steel,

[0051] The rolling includes rough rolling, intermediate billet cooling, intermediate rolling and finish rolling,

[0052] The total compression ratio of the stretching stage in the rough rolling is ≤30%, and the total compression ratio of the longitudinal rolling after the stretching is ≥45%;

[0053] The intermediate billet is cooled at a cooling rate of 1-5°C / s;

[0054] The intermediate rolling and finishing rol...

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Abstract

The invention discloses a high-strength and low-hardness hydrogen sulfide corrosion-resistant steel. The chemical composition of the steel is: C: 0.01-0.05%, Si: 0.05-0.35%, Mn: 1.10-1.40%, P : ≤0.006%, S: ≤0.0005%, Alt: 0.01~0.05%, Nb: 0.01~0.05%, V: 0.01~0.05%, Ti: 0.005~0.02%, Ni: 0.00~0.20%, Cr: 0.00~ 0.20%, Cu: 0.00~0.20%, the rest is Fe and unavoidable impurities; and carbon equivalent CE IIW : 0.30~0.33%, CE Pcm : 0.12-0.14%. The invention also discloses a preparation method, and the prepared steel has high strength, low hardness and excellent hydrogen sulfide corrosion resistance.

Description

technical field [0001] The invention relates to the technical field of steel preparation, in particular to a high-strength, low-hardness hydrogen sulfide corrosion-resistant steel and a preparation method thereof. Background technique [0002] Hydrogen sulfide is one of the most corrosive and harmful media in oil and natural gas. In the process of natural gas transportation, hydrogen sulfide accounts for a large proportion of stress corrosion of pipelines. When used in a wet hydrogen sulfide environment, the intrusion of hydrogen generated by corrosion into the steel can lead to hydrogen bubbling (HB), hydrogen induced cracking (HIC) and sulfide stress corrosion cracking (SSCC) in the material. [0003] For hydrogen sulfide, the risk of corrosion mainly comes from corrosion cracking (SSCC, HIC, etc.) caused by the penetration of hydrogen atoms in hydrogen sulfide into the material matrix. All H2S corrosion resistant steel selections focus on how to select materials resistan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/48C22C38/46C22C38/50C22C38/42C21D8/02
CPCC22C38/02C22C38/04C22C38/06C22C38/48C22C38/46C22C38/50C22C38/42C21D8/0226C21D2211/005
Inventor 李少坡丁文华王志勇张海李战军李群樊艳秋马长文田士平周德光
Owner SHOUGANG CORPORATION
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