High strength seamless stainless steel pipe for oil well and production method therefor
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A technology for seamless steel pipes and manufacturing methods, applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problems of not being able to ensure sufficient corrosion resistance stably, and achieve excellent resistance to sulfide stress corrosion cracking, excellent low temperature toughness, The effect of excellent carbon dioxide corrosion resistance
Pending Publication Date: 2019-10-08
JFE STEEL CORP
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However, the technique described in Patent Document 1 has a problem that it cannot stably and sufficiently ensure desired corrosion resistance in such a high-temperature corrosive environment.
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[0133] Hereinafter, the present invention will be further described based on examples.
[0134] The molten steel with the composition shown in Table 1 was smelted in a converter, cast into a billet (steel pipe raw material) by continuous casting, the steel pipe raw material was heated, and the pipe was formed by hot working using a model seamless rolling mill to produce a pipe with an outer diameter of 83.8 mm. mm × wall thickness 12.7mm seamless steel pipe, and air-cooled. At this time, the heating temperatures of the steel pipe raw materials before hot working are as shown in Table 2.
[0135] 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.
[0136] The test piece for tissue observation was collected from...
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Abstract
Provided is a high strength seamless stainless steel pipe for an oil well that has excellent low temperature toughness, carbon dioxide gas corrosion resistance, sulfide stress corrosion cracking resistance and sulfide stress cracking resistance. The 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, N: 0.15% or less, and B: 0.0005-0.0100%, C, Si, Mn, Cr, Ni, Mo, Cu and N satisfying a specified formula and Cu, Mo, W, Cr and Ni satisfying another specified formula, the balance being Fe and unavoidable impurities, and has greater than 45% of martensitic phases, 10-45% of ferritic phases, and 30% or less of retained austenite phases. When a continuous 100 mm<2> region is examined by electron backscatter diffraction (EBSD) considering grains within a 15-degree crystal orientation difference to be the same grain, the maximum crystal grain diameter of ferrite grains is 500 [mu]m or less, and the 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 referred to as oil wells), etc. 2 ), chloride ion (Cl - ) and high temperature extremely harsh corrosion environment excellent carbon dioxide corrosion resistance, containing hydrogen sulfide (H 2 In the environment of S), high-strength seamless stainless steel suitable for oil well applications is excellent in sulfide stress corrosion cracking resistance (SCC resistance) at high temperature and sulfide stress cracking resistance (SSC resistance) at room temperature Steel Pipe. In addition, the "high strength" mentioned here means the strength of the yield strength of 125 ksi class, that is, the strength of 862 MPa or more of yield strength. Background technique [0002] In recent years, from the standpoint of rising crude oil prices and the depletion of oil resources that are expected in...
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