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
CN1729306AInactive Publication Date: 2006-02-01NIPPON STEEL CORP
3 Cites 15 Cited by

Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
NIPPON STEEL CORP
Publication Date
2006-02-01
Estimated Expiration
Not applicable Β· inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More