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High strength seamless stainless steel pipe for oil wells and production method therefor

A technology of seamless steel pipe and manufacturing method, which is applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problem of not being able to stably and fully ensure corrosion resistance, etc., and achieve the effect of excellent low temperature toughness

Inactive Publication Date: 2019-04-02
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the technique described in Patent Document 1, there is a problem that the desired corrosion resistance cannot be sufficiently and stably ensured in such a high-temperature corrosive environment.

Method used

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  • High strength seamless stainless steel pipe for oil wells and production method therefor
  • High strength seamless stainless steel pipe for oil wells and production method therefor

Examples

Experimental program
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Effect test

Embodiment

[0142] Hereinafter, the present invention will be further described based on examples.

[0143] Molten steel with the composition shown in Table 1 was smelted in a converter, cast into a billet (steel pipe raw material) by a continuous casting method, and made into a tube by hot working using a model seamless rolling mill to produce a tube with an outer diameter of 83.8 mm x a wall thickness of 12.7 mm. mm seamless steel pipe. In addition, air cooling is performed after pipe making.

[0144] Test piece raw materials were cut out from the obtained seamless steel pipes, and subjected to a quenching treatment in which they were heated under the conditions shown in Table 2 and then cooled. Then, a tempering treatment of heating under the conditions shown in Table 2 and then air cooling was further implemented.

[0145] The test piece for tissue observation was cut out from the test piece raw material after the quenching-tempering treatment in this way, and the test piece for tis...

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Abstract

Provided is a high strength seamless stainless steel pipe for oil wells with excellent low temperature toughness, carbon dioxide gas corrosion resistance, sulfide stress corrosion cracking resistance,and sulfide stress cracking resistance. The steel pipe contains, in mass%, C: 0.05% or less, Si: 0.5% or less, Mn: 0.15-1.0%, P: 0.030% or less, S: 0.005% or less, Cr: 14.5-17.5%, Ni: 3.0-6.0%, Mo: 2.7-5.0%, Cu: 0.3-4.0%, W: 0.1-2.5%, V: 0.02-0.20%, Al: 0.10% or less, and N: 0.15% or less, wherein C, Si, Mn, Cr, Ni, Mo, Cu and N satisfy a specified expression and Cu, Mo, W, Cr and Ni satisfy another specified expression, and the balance is made of Fe and unavoidable impurities. The steel pipe comprises martensite phase: greater than 45%, ferrite phase: 10-45%, and retained austenite phase: 30% or less. The total amount of deposited Cr, deposited Mo and deposited W is not more than 0.75 mass% and yield strength is at least 862 MPa.

Description

technical field [0001] The present invention relates to a high-strength stainless steel seamless steel pipe suitable for use in crude oil or natural gas oil wells, gas wells (hereinafter simply referred to as oil wells), and the like. Especially in the presence of carbon dioxide (CO 2 ), chloride ion (Cl - ) and high temperature extremely severe corrosion environment, excellent carbon dioxide corrosion resistance, containing hydrogen sulfide (H 2 High-strength seamless stainless steel that is also excellent in sulfide stress corrosion cracking resistance (SCC resistance) at high temperatures and sulfide stress cracking resistance (SSC resistance) at room temperature in the environment of S) and is suitable for oil well applications Steel Pipe. In addition, the "high strength" mentioned here means the strength of 125 ksi order of yield strength, ie, the strength of 862 MPa or more of yield strength. Background technique [0002] In recent years, from the standpoint of ris...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D8/10C21D9/08C22C38/46C22C38/60
CPCC21D8/10C21D9/08C22C38/00C22C38/46C22C38/60C21D6/004C21D8/105C21D1/18C22C38/001C22C38/002C22C38/005C22C38/008C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/48C22C38/50C22C38/52C22C38/54C21D2211/005C21D2211/008C21D2211/001C21D2211/004
Inventor 江口健一郎石黑康英
Owner JFE STEEL CORP
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