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High-strength and low-hardness hydrogen sulfide corrosion resistant steel and preparation method thereof

A technology of anti-hydrogen sulfide and low hardness, applied in the field of steel preparation, can solve the problem that anti-hydrogen sulfide corrosion steel cannot satisfy high strength, increased hardness and low hardness at the same time, and achieve excellent anti-hydrogen sulfide corrosion performance, low hardness, high Effects on service life and safety

Active Publication Date: 2021-01-08
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • High-strength and low-hardness hydrogen sulfide corrosion resistant steel and preparation method thereof
  • High-strength and low-hardness hydrogen sulfide corrosion resistant steel and preparation method thereof
  • High-strength and low-hardness hydrogen sulfide corrosion resistant steel and preparation method thereof

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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 high-strength and low-hardness hydrogen sulfide corrosion resistant steel. The steel comprises the following chemical components in percentage by mass: 0.01-0.05% of C, 0.05-0.35% of Si, 1.10%-1.40% of Mn, less than or equal to 0.006% of P, less than or equal to 0.0005% of S, 0.01%-0.05% of Alt, 0.01%-0.05% of Nb, 0.01%-0.05% of V, 0.005%-0.02% of Ti, 0.00%-0.20% of Ni, 0.00%-0.20% of Cr, 0.00%-0.20% of Cu and the balance of Fe and inevitable impurities, wherein the carbon equivalent CEIIW is 0.30%-0.33%, and the CEPcm is 0.12%-0.14%. The invention further 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 Applications(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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