Martensitic stainless steel for oil well and its producing method

A stainless steel pipe and stainless steel technology, which is applied in the field of manufacturing martensitic stainless steel for oil wells and martensitic stainless steel pipes for oil wells, can solve problems such as inability to ensure low-temperature toughness, and achieve excellent low-temperature toughness and good SSC resistance.

Inactive Publication Date: 2006-11-15
SUMITOMO METAL IND LTD
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Problems solved by technology

Therefore, although the steel for oil well pipes has good SSC resistance in the coexistence of chloride ions, wet carbon dioxide gas, and a small amount of hydrogen sulfide, it cannot ensure sufficient low-temperature toughness.

Method used

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Embodiment Construction

[0032] Hereinafter, each requirement of the present invention will be described in detail. In addition, "%" of content of a chemical component means "mass %".

[0033] (A) chemical composition

[0034] C: 0.16 to 0.22%

[0035] C is an element necessary for imparting desired strength to steel. In addition, C can easily form martensite in the structure of steel by air cooling, and also has the effect of improving SSC resistance. In order to improve SSC resistance on the basis of high-strength materials, it is desirable that the structure of the steel form a martensitic structure (preferably 95% or more), but since C is an austenite-forming element, it can be easily achieved by increasing the content of C. Increase the ratio of martensite. However, when the C content is less than 0.16%, it is difficult to obtain the above-mentioned effects. On the other hand, if it contains more than 0.22%, toughness will fall remarkably. Therefore, the C content is set to 0.16 to 0.22%. ...

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Abstract

The present invention provides a martensitic stainless steel for oil wells that has good SSC resistance and excellent low-temperature toughness under the coexistence of Cl-, wet CO2 and a small amount of H2S. The steel material contains, by mass %, C: 0.16-0.22%, Si: 0.1-0.8%, Mn: 0.25-1.00%, P: 0.025% or less, S: 0.010% or less, Cr: 12.0-13.5%, Al: 0.010% or less, Ni: 0-0.2%, Cu: 0-0.10%, Mo: 0-0.20%, Ti: 0-0.050%, N: 0.01-0.1%, and the balance is composed of Fe and impurities. It may also contain predetermined amounts of one or more of Nb and V and / or predetermined amounts of one or more of Ca, Mg, La, and Ce.

Description

technical field [0001] The present invention relates to the manufacturing method of martensitic stainless steel for oil well and martensitic stainless steel pipe for oil well, in particular, relates to a method suitable for containing hydrogen sulfide (H 2 S) and carbon dioxide gas (CO 2 ), chloride ion (Cl - ) and other corrosive substances such as martensitic stainless steel for oil wells and martensitic stainless steel pipes for oil wells used in cold areas with harsh corrosive environments. More specifically, it relates to seamless steel pipes, electric resistance welded steel pipes, and laser steel pipes suitable for use in oil or natural gas production equipment, carbon dioxide gas removal equipment, and geothermal power generation equipment, and oil wells or natural gas wells in cold regions. Martensitic stainless steel for oil wells used for oil well pipes such as welded steel pipes and a method for producing martensitic stainless steel pipes for oil wells. Backgro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/50C21D9/08C21D11/00
CPCC22C38/02C22C38/04C22C38/44C22C38/46C22C38/48C22C38/50
Inventor 高部秀树
Owner SUMITOMO METAL IND LTD
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