High-strength martensitic stainless steel with excellent resistances to carbon dioxide gas corrosion and sulfide stress corrosion cracking

A martensitic stainless steel, stress corrosion technology, applied in the field of steel, can solve problems such as inability to obtain strength

Inactive Publication Date: 2006-02-01
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, steels with a low carbon content described in these gazettes may not be able to obtain the strength necessary for use in deep wells, that is, a resistance of 860 MPa or more.

Method used

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  • High-strength martensitic stainless steel with excellent resistances to carbon dioxide gas corrosion and sulfide stress corrosion cracking
  • High-strength martensitic stainless steel with excellent resistances to carbon dioxide gas corrosion and sulfide stress corrosion cracking

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Embodiment Construction

[0018] The reasons for limiting the content of each element specified in the present invention will be described below. In addition,% of each content means mass %.

[0019] C: 0.005~0.04%

[0020] Although C is an effective element in improving the strength of steel, it is better to have as little as possible in terms of corrosion resistance. However, when it is less than 0.005%, since the endurance does not reach 860 MPa or more, the lower limit of the content is made 0.005%. On the other hand, when its content exceeds 0.04%, the hardness after tempering becomes too high, and the sulfide stress corrosion cracking sensitivity becomes high. Therefore, the content of C is set to 0.005 to 0.04%.

[0021] Si: 0.5% or less

[0022] Si is an essential element as a deoxidizer. The residual amount in steel can also be an impurity level. However, in order to obtain a greater deoxidation effect, it is best to set its content to 0.01% or more. On the other hand, when its content exceeds 0.5%...

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Abstract

The present invention provides a martensitic stainless steel wherein the steel composition is limited with respect to specified components, wherein the Mo content is defined in relation to IM value, and wherein the metallic structure thereof is mainly constituted of tempered martensite, a carbide precipitated at tempering and intermetallic compounds, Laves phase and sigma-phase, microprecipitated at tempering. This martensitic stainless steel has a high strength of 860 MPa or greater 0.2% proof stress and can exhibit excellent resistances to carbon dioxide gas corrosion and sulfide stress corrosion cracking. This martensitic stainless steel can be used as a highly practicable steel in a wide spectrum of fields, including oil well pipes, etc. exposed to an environment containing carbon dioxide gas, hydrogen sulfide, chloride ion or two or more of these.

Description

Technical field [0001] The present invention relates to a steel material suitable for use in a harsh corrosive environment containing corrosive substances such as carbon dioxide gas, hydrogen sulfide, and chloride ions. More specifically, it relates to seamless steel pipes for oil or natural gas production equipment, carbon dioxide removal equipment, geothermal power generation equipment, etc., seam welded steel pipes such as electric seam steel pipes, laser welded steel pipes, and spiral welded pipes. Steel materials used to form tanks for liquids containing carbon dioxide, especially steel materials for oil well pipes used in oil or natural gas wells. Background technique [0002] From the viewpoint of the depletion of petroleum resources in the near future, in recent years, the development of oil wells under severe environments, that is, deep oil wells, sour gas fields, etc., is actively progressing. Therefore, oil well steel pipes used for this purpose are required to have hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/58C21D6/00C22C38/06C22C38/42C22C38/44C22C38/46C22C38/50
CPCC22C38/50C22C38/46C21D2211/008C22C38/42C22C38/06C21D1/25C22C38/02C22C38/004C22C38/04C21D2211/004C22C38/44C21D6/004C22C38/001
Inventor 高部秀树植田昌克
Owner NIPPON STEEL CORP
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