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High-strength stainless steel seamless pipe having excellent corrosion resistance for oil well, and method for manufacturing same

A technology of corrosion resistance and manufacturing method, which is applied to high-strength stainless steel seamless pipes for oil wells with excellent corrosion resistance and its manufacturing field, which can solve the problems of high manufacturing costs and economic disadvantages, and achieve excellent resistance to sulfide stress cracking Effect

Active Publication Date: 2015-03-11
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is a problem that an increase in Cr, which is an expensive alloy element, leads to an increase in manufacturing cost, which becomes economically disadvantageous.

Method used

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  • High-strength stainless steel seamless pipe having excellent corrosion resistance for oil well, and method for manufacturing same
  • High-strength stainless steel seamless pipe having excellent corrosion resistance for oil well, and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0105] Molten steel with the composition shown in Table 1 was smelted in a converter, cast into billets (steel pipe raw materials) by continuous casting, and made into tubes by hot working using a model seamless rolling mill. mm × seamless pipe with a wall thickness of 12.7mm.

[0106] Test piece raw materials were cut out from the obtained seamless pipes, and subjected to a quenching treatment in which they were heated under the conditions shown in Table 2 and then cooled. Furthermore, a tempering treatment of heating under the conditions shown in Table 2 and then air-cooling was performed.

[0107] A test piece for structure observation was cut out from the test piece raw material subjected to the quenching-tempering treatment in this way, and the test piece for structure observation was corroded with hydrochloric acid picric acid alcohol solution (Vilella reagent), and examined with a scanning electron microscope (1000 times ) photograph the tissue, and calculate the tissu...

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PUM

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Abstract

This stainless steel seamless pipe contains, in terms of mass%, C: 0.05% or less, Si: 0.5% or less, Mn: 0.15 to 1.0%, Cr: 13.5 to 15.4%, Ni: 3.5 to 6.0%, Mo: 1.5 to 5.0%, Cu: 2.5% or less, W: 2.5% or less, and N: 0.15% or less so as to satisfy the formula -5.9 × (7.82 + 27C - 0.91Si + 0.21Mn - 0.9Cr + Ni - 1.1Mo - 0.55W + 0.2Cu + 11N) >= 13.0. A high-strength seamless steel pipe having sulfide stress cracking resistance equivalent to composite steel containing about 17% Cr can be manufactured, even using a composition containing a relatively low amount of Cr of about 15%. It is furthermore possible to include one or more elements selected from V: 0.02 to 0.12%, and / or Al: 0.05% or less, and / or Nb: 0.02 to 0.50%, Ti: 0.02 to 0.16%, Zr: 0.50% or less, and B: 0.0030% or less; and / or one or more elements selected from REM: 0.005% or less, Ca: 0.005% or less, and Sn: 0.20% or less.

Description

technical field [0001] The present invention relates to a high-strength stainless steel seamless steel pipe (hereinafter also referred to as a high-strength stainless steel seamless pipe) suitable for use in oil wells and gas wells of crude oil or natural gas, and particularly relates to steel pipes containing carbon dioxide (CO 2 ), chloride ion (Cl - ) and carbon dioxide corrosion resistance in an extremely severe corrosive environment with a high temperature of 200°C, and in the presence of hydrogen sulfide (H 2 S) A high-strength stainless steel seamless pipe suitable for oil wells with excellent sulfide stress cracking resistance in an environment. The high-strength stainless steel seamless pipe targeted by the present invention is a steel pipe having a yield strength of 110 ksi to 125 ksi, that is, a yield strength of 758 MPa to 1034 MPa. Background technique [0002] In recent years, from the standpoint of rising crude oil prices and the expected depletion of oil re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D9/08C22C38/46C22C38/54
CPCC22C38/54C21D9/08C22C38/005C22C38/04C22C38/44C21D6/004C22C38/50C22C38/46C22C38/42C22C38/06C22C38/48C22C38/008C22C38/02C22C38/001C22C38/00C22C38/002C21D6/005C21D6/008C21D9/085
Inventor 江口健一郎石黑康英宫田由纪夫木村光男
Owner JFE STEEL CORP
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