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CN104379774A - High-strength stainless steel seamless pipe for use as oil well piping, and manufacturing method therefor - Google Patents

High-strength stainless steel seamless pipe for use as oil well piping, and manufacturing method therefor Download PDF

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Publication number
CN104379774A
CN104379774A CN201380028317.XA CN201380028317A CN104379774A CN 104379774 A CN104379774 A CN 104379774A CN 201380028317 A CN201380028317 A CN 201380028317A CN 104379774 A CN104379774 A CN 104379774A
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rolling
stainless steel
oil well
strength stainless
wall thickness
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CN201380028317.XA
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CN104379774B (en
Inventor
宫田由纪夫
石黑康英
石川和俊
中桥哲
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JFE Steel Corp
JFE Engineering Corp
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NKK Corp
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
    • C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • C21D9/085—Cooling or quenching
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/001—Austenite
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite

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  • Materials Engineering (AREA)
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  • Physics & Mathematics (AREA)
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  • Manufacturing & Machinery (AREA)
  • Heat Treatment Of Steel (AREA)
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Abstract

Provided is a high-strength stainless steel seamless pipe for use as oil well piping that has a wall thickness surpassing 25.4 mm, that is rated at 110 ksi (758 MPa) or higher, that exhibits a vE-10 of 40J or higher, and that exhibits excellent corrosion resistance in a high-temperature corrosive environment. The steel seamless pipe is obtained by heating and hot rolling a steel material of which the composition includes, in terms of mass%, 0.005-0.06% of C, 0.05-0.5% of Si, 0.2-1.8% of Mn, 15.5-18.0% of Cr, 1.5-5.0% of Ni, 0.02-0.2% of V, 0.002-0.05% of Al, 0.01-0.15% of N, and 0.006% or less of O, and additionally includes 1.0-3.5% of Mo and/or 3.0% or less of W and/or 3.5% or less of Cu so as to satisfy Cr+0.65Ni+0.60Mo+0.30W+0.55Cu-20C>=19.5 and Cr+Mo+0.50W+0.30Si-43.5C- 0.4Mn-Ni-0.3Cu-9N>=11.5. On this occasion, hot rolling is carried out so as to achieve a total rolling reduction rate of 30% or more in the temperature range of 1100-900 DEG C. After completion of hot rolling, cooling is carried out at a cooling rate faster than that of air cooling, and a hardening-tempering treatment is performed.

Description

Pipe for oil well use high-strength stainless steel seamless tube and manufacture method thereof
Technical field
The present invention relates to oil well seamless steel pipe (seamless steel tube for Oil CountryTubular Goods), particularly have the high-strength stainless steel seamless tube of excellent low-temperature flexibility (low-temperaturetoughness) and excellent erosion resistance (corrosion resistance) concurrently.
Background technology
In recent years, in order to tackle the exhaustion (exhaustion of petroleum) of the petroleum resources that are surging, that can expect in the near future of crude oil price, worldwide always develop energetically not yet by verify deep reservoir (deep oil well), for the time being by the strong acid gas field (sour gas field) etc. of corrodibility abandoning developing.For such oil field, gas field, the usual degree of depth is dark, and forms its atmosphere also for high temperature and containing CO 2, Cl -deng harsh corrosive environment (corrosion environment).Therefore, the Oil Well Pipe used in the exploitation as this oil field, gas field, the steel pipe of the high and excellent corrosion resistance of desired strength.
Containing CO 2, Cl -deng harsh corrosive environment under oil field, in gas field, used 13%Cr martensitic stainless steel pipe as Oil Well Pipe in the past always.But common 13%Cr martensitic stainless steel exists containing a large amount of Cl -and short-life problem under hot environment more than 100 DEG C.
Therefore, under the corrosive environment of this high temperature, use duplex phase stainless tube (duplexstainless tube) always.But duplex phase stainless tube is existed that alloying element amount is many, hot workability is poor, can only be manufactured by special hot-work method and expensive such problem.
For this problem, such as, a kind of manufacture method of oil well high strength stainless steel pipe of excellent corrosion resistance is described in patent documentation 1, wherein, former for steel pipe material is made the steel pipe of predetermined size by hot-work, after tubulation, room temperature is cooled to speed of cooling more than air cooling, quenching-temper (quenching-tempering) to this steel pipe is implemented as follows: reheat to the temperature of more than 850 DEG C, less than 100 DEG C are cooled to speed of cooling more than air cooling, then the temperature of less than 700 DEG C is heated to, the former material of described steel pipe has following composition: in mass % containing C:0.005 ~ 0.05%, Si:0.05 ~ 0.5%, Mn:0.2 ~ 1.8%, Cr:15.5 ~ 18%, Ni:1.5 ~ 5%, Mo:1 ~ 3.5%, V:0.02 ~ 0.2%, N:0.01 ~ 0.15%, below O:0.006%, and meet following (1) formula and following (2) formula,
Cr+0.65Ni+0.60Mo+0.30W+0.55Cu-20C≥19.5…(1)
(at this, Cr, Ni, Mo, W, Cu, C are the content (quality %) of each element)
Cr+Mo+0.50W+0.30Si-43.5C-0.4Mn-Ni-0.3Cu-9N≥11.5…(2)
(at this, Cr, Mo, W, Si, C, Mn, Ni, Cu, N are the content (quality %) of each element).
According to the technology described in patent documentation 1, even if that cannot tolerate at 13%Cr martensitic stainless steel, containing greater concn CO stably can be manufactured 2, Cl -deng and under reaching the harsh corrosive environment of about 200 DEG C of higher temperature, also there is sufficient erosion resistance and the high oil well stainless steel tube of intensity.
In addition, a kind of manufacture method of stainless steel tube is described in patent documentation 2, wherein, hot-work is carried out to steel billet and makes steel pipe, then Q-tempering process is implemented, described steel billet is in mass % containing C:0.001 ~ 0.05%, Si:0.05 ~ 1%, below Mn:2%, Cr:16 ~ 18%, Ni:3.5 ~ 7%, Mo: be greater than 2% and be less than 4%, Cu:1.5 ~ 4%, rare earth element: 0.001 ~ 0.3%, sol.Al:0.001 ~ 0.1%, Ca:0.0001 ~ 0.3%, below N:0.05%, below O:0.05%, or further containing being selected from by below Ti:0.5%, below Zr:0.5%, below Hf:0.5%, one kind or two or more in the group that below V:0.5% forms.According to the technology described in patent documentation 2, under the harsh corrosive environment of the high temperature reaching about 230 DEG C, also there is sufficient erosion resistance and the high oil well stainless steel tube of intensity even if can manufacture.
Prior art document
Patent documentation
Patent documentation 1: Japanese Unexamined Patent Publication 2005-336595 publication
Patent documentation 2: Japanese Patent No. 4577457 publication
Summary of the invention
Invent problem to be solved
Recently, the situation that the dark oil well of the degree of depth, gas well are exploited being increased, in order to prevent the pressure from stratum from causing oil well pipe to be damaged by pressure, requiring the oil well pipe of heavy wall.In the technology that patent documentation 2 is recorded, there are the following problems: when wall thickness is greater than the heavy wall of 25.4mm, and toughness reduces, and can not have desired high tenacity and high strength concurrently.
The object of the invention is to the problem solving above-mentioned prior art, provide and there is wall thickness be greater than the heavy wall of 25.4mm and the absorption energy vE of Charpy impact test (Charpy impact test) at having the high strength and test temperature-10 DEG C that yield strength is more than 110ksi (758MPa) level concurrently -10for more than 40J high tenacity and also there is pipe for oil well use high-strength stainless steel seamless tube and the manufacture method thereof of excellent erosion resistance.In addition, " excellent erosion resistance " described herein is even if refer to high temperature more than 230 DEG C and containing CO 2, Cl -corrosive environment under also demonstrate excellent resistance to CO 2corrosive situation.
For the method for dealing with problems
To achieve these goals, first the present inventor conducts in-depth research the various factors affecting toughness.Result is expected, in order to improve the toughness of heavy wall stainless steel tube, first needs to make to organize miniaturization.In order to improve erosion resistance, for making composition contain for the stainless steel of the Cr of 16 ~ 18%, the Ni of about 2% ~ about 6%, the ferrite crystallization when solidifying, when being cooled to room temperature, a part also becomes austenite mutually.But the non-completely dissolve owing to remaining, therefore, even if by thermal treatment afterwards, also almost can not make the miniaturization of crystallization particle diameter.Therefore, the present inventor expects, adopts each alternate, interval GSI value (Grain SizeIndex) between ferrite and austenite (martensite) as the index of the miniaturization organized.And find, by reducing GSI value, that is, by making each alternate narrower intervals, the toughness consisting of the stainless steel tube containing the Cr of 16 ~ 18%, the Ni of about 2% ~ about 6% improves.
And the present inventor is by further studying discovery, and when implementing to comprise the hot-work of drilling/rolling, be certain above hot-work by the rolling rate implemented in predetermined temperature range, each alternate interval GSI narrows, and toughness significantly improves.
First, the experimental result as basis of the present invention is described.
Composition is heated to various Heating temperature containing 0.026%C-0.20%Si-0.24%Mn-0.01%P-0.001%S-16.7%Cr-4.11%Ni-0 .027%V-2.13%Mo-1.06%W-0.51%Cu-0.02%Al-0.051%N and surplus by Fe and the former material of steel (steel billet, billet) that inevitably impurity is formed in mass %.And then, various change is carried out to utilizing rolling temperature, the rolling rate of the hot rolling of tapping machine (piercer mill), elongating mill (elongator mill), plug mill (plugmill) etc., make the weldless steel tube of external diameter 297mm φ × wall thickness 26 ~ 34mm, then, air cooling is to room temperature.Cut structure observation test film from obtained steel pipe, grind, utilize Wei Liela etching solution (vilella ' s reagent) to corrode, by opticmicroscope (multiplying power: 400 times) tissues observed.By carrying out image analysis to obtained macrograph, measure the index of GSI value as the miniaturization of tissue.About GSI value, use the macrograph obtained, wall thickness direction measures the quantity (bar/mm) of the ferrite-martensite crystal boundary of per unit length, obtains GSI value thus.In addition, from obtained steel pipe, cut Charpy impact test sheet (10mm is thick) along length of tube direction, measure at test temperature-10 DEG C and absorb energy vE -10(J).Obtained result is utilized vE -10carry out arranging with the relation of GSI value and shown in Figure 1.
As shown in Figure 1, in order to ensure vE -10for more than 40J, need to carry out making GSI to be the miniaturization of the tissue of more than 120.In addition, the present inventor confirms in other experiments, by implementing to add up to amount of rolling to be the hot rolling of more than 30% at 1100 ~ 900 DEG C, can realize making GSI to be the miniaturization of the tissue of more than 120.For being heated to the hot rolling comprising drilling/rolling of common Heating temperature (1100 ~ 1250 DEG C), the temperature range of 1100 ~ 900 DEG C is equivalent to the rolling utilizing the rolling of elongating mill, plug mill or utilize the seamless tube rolling mill of core rod type.Namely find, in order to improve the low-temperature flexibility of weldless steel tube, that is, in order to carry out the miniaturization organized, key the rolling utilizing elongating mill, plug mill etc. is become add up to amount of rolling to be the low temperature of more than 30% and the rolling under suppressing.
The present invention is also studied further based on above-mentioned opinion and is completed.That is, purport of the present invention is as described below.
(1) a kind of wall thickness is greater than the manufacture method of the oil well high-strength stainless steel seamless tube of 25.4mm, it is made weldless steel tube and further this weldless steel tube is cooled to the manufacture method of the weldless steel tube of room temperature with speed of cooling more than air cooling for heating, implement to comprise the hot rolling of drilling/rolling to the former material of steel pipe, it is characterized in that
The former material of above-mentioned steel pipe has following composition: in mass %, containing C:0.005 ~ 0.06%, Si:0.05 ~ 0.5%, Mn:0.2 ~ 1.8%, below P:0.03%, below S:0.005%, Cr:15.5 ~ 18.0%, Ni:1.5 ~ 5.0%, V:0.02 ~ 0.2%, Al:0.002 ~ 0.05%, N:0.01 ~ 0.15%, below O:0.006%, and contain in the mode meeting following (1) formula and following (2) formula and be selected from Mo:1.0 ~ 3.5%, below W:3.0%, one kind or two or more in below Cu:3.5%, surplus is made up of Fe and inevitable impurity,
The above-mentioned hot rolling comprising drilling/rolling is the total rolling rate in 1100 ~ 900 DEG C of temperature ranges is the rolling of more than 30%, after this rolling, be cooled to above-mentioned room temperature, then implements Q-tempering process or temper further,
Cr+0.65Ni+0.60Mo+0.30W+0.55Cu-20C≥19.5…(1)，
(at this, Cr, Ni, Mo, W, Cu, C are the content (quality %) of each element)
Cr+Mo+0.50W+0.30Si-43.5C-0.4Mn-Ni-0.3Cu-9N≥11.5…(2)
(at this, Cr, Mo, W, Si, C, Mn, Ni, Cu, N are the content (quality %) of each element).
(2) manufacture method of high-strength stainless steel seamless tube of the oil well as described in (1), it is characterized in that, on the basis of above-mentioned composition, in mass %, one kind or two or more containing what be selected from below Nb:0.2%, below Ti:0.3%, below Zr:0.2%, below B:0.01% further.
(3) the oil well manufacture method of high-strength stainless steel seamless tube as described in (1) or (2), is characterized in that, on the basis of above-mentioned composition, in mass %, further containing below Ca:0.01%.
(4) wall thickness is greater than an oil well high-strength stainless steel seamless tube of 25.4mm, it is characterized in that,
There is following composition: in mass %, containing C:0.005 ~ 0.06%, Si:0.05 ~ 0.5%, Mn:0.2 ~ 1.8%, below P:0.03%, below S:0.005%, Cr:15.5 ~ 18.0%, Ni:1.5 ~ 5.0%, V:0.02 ~ 0.2%, Al:0.002 ~ 0.05%, N:0.01 ~ 0.15%, below O:0.006%, and contain in the mode meeting following (1) formula and following (2) formula and be selected from Mo:1.0 ~ 3.5%, below W:3.0%, one kind or two or more in below Cu:3.5%, surplus is made up of Fe and inevitable impurity,
Have as undertissue: take martensitic phase as principal phase, second-phase comprises the ferritic phase of 10 ~ 60% and the austenite phase of 0 ~ 10% in volume fraction, and with the quantity of the ferrite-martensite crystal boundary existed in the per unit length of the line segment marked along wall thickness direction definition GSI value in wall thickness central portion for more than 120
And have excellent low-temperature flexibility and excellent erosion resistance concurrently,
Cr+0.65Ni+0.60Mo+0.30W+0.55Cu-20C≥19.5…(1)
(at this, Cr, Ni, Mo, W, Cu, C are the content (quality %) of each element)
Cr+Mo+0.50W+0.30Si-43.5C-0.4Mn-Ni-0.3Cu-9N≥11.5…(2)
(at this, Cr, Mo, W, Si, C, Mn, Ni, Cu, N are the content (quality %) of each element).
(5) the high-strength stainless steel seamless tube of the oil well as described in (4), it is characterized in that, on the basis of above-mentioned composition, in mass %, one kind or two or more containing what be selected from below Nb:0.2%, below Ti:0.3%, below Zr:0.2%, below B:0.01% further.
(6) the oil well high-strength stainless steel seamless tube as described in (4) or (5), is characterized in that, on the basis of above-mentioned composition, in mass %, further containing below Ca:0.01%.
Invention effect
According to the present invention, the absorption energy vE having high strength that yield strength is more than 110ksi (758MPa) level and Charpy impact test concurrently can be manufactured easily and at an easy rate -10for the high tenacity of more than 40J and the wall thickness with excellent erosion resistance are greater than the thick section and high strength stainless steel seamless pipe of 25.4mm, industrially play significant effect.
Accompanying drawing explanation
Fig. 1 is the absorption energy vE representing Charpy impact test -10with the figure of the relation of GSI.
Embodiment
First, the manufacture method of oil well high-strength stainless steel seamless tube of the present invention is described.In the present invention, heat the former material of steel pipe, enforcement comprises the hot rolling of drilling/rolling and makes weldless steel tube.
The composition restriction reason of the former material of the steel pipe used in the present invention is as described below.Below, unless otherwise specified, then the quality % in forming only represents with %.
The former material of the steel pipe used in the present invention has following composition: containing C:0.005 ~ 0.06%, Si:0.05 ~ 0.5%, Mn:0.2 ~ 1.8%, below P:0.03%, below S:0.005%, Cr:15.5 ~ 18.0%, Ni:1.5 ~ 5.0%, V:0.02 ~ 0.2%, Al:0.002 ~ 0.05%, N:0.01 ~ 0.15%, below O:0.006%, and contain in the mode meeting following (1) formula and following (2) formula and be selected from Mo:1.0 ~ 3.5%, below W:3.0%, one kind or two or more in below Cu:3.5%, surplus is made up of Fe and inevitable impurity,
Cr+0.65Ni+0.60Mo+0.30W+0.55Cu-20C≥19.5…(1)
(at this, Cr, Ni, Mo, W, Cu, C are the content (quality %) of each element)
Cr+Mo+0.50W+0.30Si-43.5C-0.4Mn-Ni-0.3Cu-9N≥11.5…(2)
(at this, Cr, Mo, W, Si, C, Mn, Ni, Cu, N are the content (quality %) of each element).
C：0.005～0.06％
C increases relevant element with the intensity of martensitic stainless steel steel.In the present invention, need containing more than 0.005%.On the other hand, be greater than 0.06% and excessive in sometimes, erosion resistance significantly reduces.Therefore, C is defined as the scope of 0.005 ~ 0.06%.In addition, 0.01 ~ 0.04% is preferably.
Si：0.05～0.5％
Si is the element played a role as reductor, in the present invention containing more than 0.05%.But, when content is greater than 0.5%, resistance to CO 2corrodibility reduces, and hot workability also reduces.Therefore, Si is defined as the scope of 0.05 ~ 0.5%.In addition, 0.1 ~ 0.4% is preferably.
Mn：0.2～1.8％
Mn is the element of gaining in strength, in order to ensure high strength desired in the present invention containing more than 0.2%.On the other hand, when content is greater than 1.8%, detrimentally affect is brought to toughness.Therefore, Mn is defined as the scope of 0.2 ~ 1.8%.In addition, 0.2 ~ 0.8% is preferably.
Below P:0.03%
P is the element reducing erosion resistance, expects to reduce as much as possible in the present invention.But, if as relatively inexpensively can implementing and the degree of less than 0.03% of the scope of erosion resistance can not being reduced, then can allow.Therefore, P is defined as less than 0.03%.In addition, reduction extremely can cause the surging of manufacturing cost, is preferably more than 0.005%.
Below S:0.005%
S is the element significantly reducing hot workability, expects to reduce as much as possible.But, if be less than 0.005%, then can carry out pipe manufacturer by usual operation, thus can allow.Therefore, S is defined as less than 0.005%.In addition, reduction extremely can cause the surging of manufacturing cost, is therefore preferably more than 0.0005%.
Cr：15.5～18.0％
Cr is the element forming protective membrane and improve erosion resistance, especially contributes to improving resistance to CO 2corrodibility.In the present invention, from the view point of the erosion resistance improved under high temperature, need containing more than 15.5%.On the other hand, when content is greater than 18%, hot workability can be made to reduce, and intensity reduce.Therefore, Cr is defined as the scope of 15.5 ~ 18.0%.In addition, be preferably 16.0 ~ 17.5%, be more preferably 16.5 ~ 17.0%.
Ni：1.5～5.0％
Ni be have make protection tunicle firmly, improve erosion resistance effect and there is solid solution and increase the element of the intensity of steel.This effect becomes remarkable when containing more than 1.5%.On the other hand, when content is greater than 5.0%, the stability of martensitic phase reduces, and intensity reduces.Therefore, Ni is defined as the scope of 1.5 ~ 5.0%.In addition, 3.0 ~ 4.5% are preferably.
V：0.02～0.2％
V contributes to by precipitation strength gaining in strength, and has the effect improving anticorrosion stress-resistant cracking behavior.In order to obtain this effect, need containing more than 0.02%.On the other hand, when content is greater than 0.2%, toughness reduces.Therefore, V is defined as the scope of 0.02 ~ 0.2%.In addition, 0.03 ~ 0.08% is preferably.
Al：0.002～0.05％
Al is the element played a role as reductor, in order to obtain this effect, needs containing more than 0.002%.On the other hand, be greater than 0.05% and excessive in sometimes, alumina type inclusion increases, and ductility, toughness reduce.Therefore, Al is defined as the scope of 0.002 ~ 0.05%.In addition, 0.01 ~ 0.04% is preferably.
N：0.01～0.15％
N is the element significantly improving pitting resistance, needs containing more than 0.01% in the present invention.On the other hand, be greater than 0.15% and excessive in sometimes, form various nitride and toughness is reduced.Therefore, N is defined as the scope of 0.01 ~ 0.15%.In addition, 0.02 ~ 0.08% is preferably.
Below O:0.006%
O mainly exists in the form of the oxide in steel, brings detrimentally affect to ductility, toughness etc.Therefore, expect to reduce as much as possible.When being especially greater than 0.006% increasing, hot workability, toughness, erosion resistance can be made significantly to reduce.Therefore, O is defined as less than 0.006%.
What be selected from Mo:1.0 ~ 3.5%, below W:3.0%, below Cu:3.5% is one kind or two or more
Mo, W, Cu are the element improving erosion resistance, select containing one kind or two or more.
Mo increases Cl -the patience of the spot corrosion caused, contribute to the element improving erosion resistance, need containing more than 1.0%.On the other hand, when content is greater than 3.5%, intensity reduces, and toughness also reduces, and material cost is surging.Therefore, containing sometimes, Mo is defined as the scope of 1.0 ~ 3.5%.In addition, 1.5 ~ 3.0% are preferably.
W and Mo is similarly the element contributing to improving erosion resistance, preferably containing more than 0.5%.But when content is greater than 3.0%, toughness reduces, and material cost is surging.Therefore, containing sometimes, W is defined as the scope of less than 3.0%.In addition, 0.5 ~ 2.5% is preferably.
Cu have make protection tunicle firmly, suppress hydrogen to invade effect in steel, contribute to improving erosion resistance.In order to obtain this effect, preferably containing more than 0.5%.But, be greater than 3.5% and excessive in sometimes, hot workability can be caused to reduce.Therefore, containing sometimes, Cu is defined as less than 3.5%.In addition, 0.5 ~ 2.5% is preferably.
Mentioned component is contained in the mode meeting following (1) formula and following (2) formula with above-mentioned scope,
Cr+0.65Ni+0.60Mo+0.30W+0.55Cu-20C≥19.5…(1)
(at this, Cr, Ni, Mo, W, Cu, C are the content (quality %) of each element)
Cr+Mo+0.50W+0.30Si-43.5C-0.4Mn-Ni-0.3Cu-9N≥11.5…(2)
(at this, Cr, Mo, W, Si, C, Mn, Ni, Cu, N are the content (quality %) of each element).
In addition, when the left side of (1) formula of calculating, (2) formula value, the element do not contained in the element of various middle record calculates with zero.
By regulating each content of Cr, Ni, Mo, W, Cu, C in the mode meeting (1) formula, at high temperature (reaching 230 DEG C) and containing CO 2, Cl -corrosive environment under erosion resistance (resistance to CO 2corrodibility) significantly improve.In addition, from the view point of anti-corrosion property at high temperature, the left side value of (1) formula is preferably made to be more than 20.0.
By regulating each content of Cr, Mo, W, Si, C, Mn, Ni, Cu, N in the mode meeting (2) formula, hot workability improves, and can guarantee for the manufacture of the hot workability required for martensitic stainless steel pipe.In addition, the left side value of (2) formula is preferably made to be more than 12.5.
Above-mentionedly consist of essentially consist, can further containing one kind or two or more and/or below the Ca:0.01% be selected from below Nb:0.2%, below Ti:0.3%, below Zr:0.2%, below B:0.01% beyond these essentially consists.
What be selected from below Nb:0.2%, below Ti:0.3%, below Zr:0.2%, below B:0.01% is one kind or two or more
Nb, Ti, Zr, B are increases hardness of steel and the element improving anticorrosion stress-resistant cracking behavior, selects as required containing one kind or two or more.In order to obtain this effect, preferably containing more than Nb:0.02%, more than Ti:0.04%, more than Zr:0.02%, more than B:0.001%.On the other hand, when content is greater than Nb:0.2%, Ti:0.3%, Zr:0.2%, B:0.01% respectively, toughness reduces.Therefore, preferably below Nb:0.2%, below Ti:0.3%, below Zr:0.2%, below B:0.01% is defined as respectively.
Below Ca:0.01%
Ca be make sulfide-based inclusion spheroidization, contribute to the morphology Control of the sulfide element of (morphology control function), can contain as required.By making sulfide-based inclusion spheroidization, having and making the lattice strain of the matrix around inclusion reduce and make the effect that the hydrogen capture ability of inclusion reduces.In order to obtain this effect, preferably containing more than 0.0005%.On the other hand, when content is greater than 0.01%, can cause the increase of oxide-based inclusion, erosion resistance reduces.Therefore, containing sometimes, Ca is preferably defined as less than 0.01%.
Surplus beyond mentioned component is Fe and inevitable impurity.As inevitable impurity, below O:0.010% can be allowed.
In the present invention, the manufacture method of the former material of steel pipe is not particularly limited.But, preferably use the melting method that converter (steel converter) etc. is commonly used, by conventional castmethods such as continuous casting (continuous casting) methods, the molten steel with predetermined composition made the slabs such as steel billet.In addition, except continuous metal cast process, the steel discs such as steel billet can certainly be made by ingot casting (ingot casting)-split rolling method (blooming) method.
In the present invention, the former material of the steel with above-mentioned composition is heated, implement the hot rolling comprising drilling/rolling (piercing rolling) of common Mannesmann plug mill mode (Mannesmann-plug mill method) or the seamless tube rolling mill mode of Mannesmann's core rod type (Mannesmann-mandrel mill method), and then be cooled to room temperature with speed of cooling more than air cooling, make weldless steel tube.In addition, the wall thickness of weldless steel tube is made to be greater than 25.4mm.In order to ensure the weldless steel tube of this wall thickness, certainly the size of the former material of steel as initial raw materials to be adjusted to proper range.
The Heating temperature of the former material of steel: 1100 ~ 1300 DEG C
When the Heating temperature of the former material of steel is lower than 1100 DEG C, Heating temperature is too low and resistance to deformation is increased, excessive and be difficult to carry out hot rolling to the load of roller mill.On the other hand, when reaching a high temperature more than 1300 DEG C, overgrowth of crystals and toughness is reduced, and oxide skin loss amount increases, and yield rate reduces.Therefore, the Heating temperature of the former material of steel is preferably 1100 ~ 1300 DEG C.Be more preferably 1200 ~ 1280 DEG C.
The hot rolling comprising drilling/rolling is implemented to the former material of the steel being heated to above-mentioned Heating temperature.As hot rolling, can apply successively via the tapping machine (piercer mill) implementing drilling/rolling, ensuing elongating mill (elongator mill), plug mill (plug mill), the hot rolling of reeling mill (realer mill) or the further common Mannesmann plug mill mode of sizing mill (sizing mill), or successively via the tapping machine implementing drilling/rolling, ensuing core rod type is seamless tube rolling mill (mandrel mill), any one in the hot rolling of the seamless tube rolling mill mode of common Mannesmann core rod type of sinking mill (reducer mill).
In the present invention, the above-mentioned hot rolling comprising drilling/rolling is the total rolling rate in 1100 ~ 900 DEG C of temperature ranges is the rolling of more than 30%.By the rolling rate in this temperature range is defined as proper range, can the interval of the crystal boundary of ferritic-austenitic (martensite) be regulated narrower, the miniaturization of tissue can be realized, and then realize the raising of toughness.Even if regulate rolling rate in the temperature range beyond the scope of 1100 ~ 900 DEG C, if the rolling rate within the scope of these 1100 ~ 900 DEG C departs from above-mentioned proper range, then the miniaturization of tissue of the present invention also cannot be realized.When the rolling rate of this temperature range is less than 30%, be difficult to carry out of the present inventionly organize miniaturization, that is, the number of grain boundaries GSI being difficult to the ferritic-austenitic (martensite) of the per unit length made on wall thickness direction is more than 120.Therefore, the rolling rate within the scope of 1100 ~ 900 DEG C is adjusted to more than 30%.Thereby, it is possible to make the crystal boundary of ferritic-austenitic (martensite) be spaced apart below preset value, for thick walled steel tube, also can realize the miniaturization of tissue, the raising of toughness can be realized.In addition, the upper limit of the rolling rate in this temperature range is not particularly limited.
In addition, for the rolling beyond the temperature ranges of 1100 ~ 900 DEG C, as long as the weldless steel tube of predetermined size shape can be manufactured, without the need to being particularly limited to.
Then, the weldless steel tube made implementing above-mentioned hot rolling is cooled to room temperature with speed of cooling more than air cooling.If the steel pipe of compositing range of the present invention, then by cooling with speed of cooling more than air cooling, can be formed with martensitic phase is the tissue of principal phase.
Then, to after tubulation and cooled weldless steel tube implements to comprise the thermal treatment of quenching-temper.
In quench treatment, be heated to more than 850 DEG C and after the quenching temperature of less than 1000 DEG C, carry out water-cooled.When quenching temperature is lower than 850 DEG C, insufficient to martensitic phase transformation, desired high strength can not be guaranteed.In addition, likely generate intermetallic compound, toughness, erosion resistance are reduced.On the other hand, when the high temperature more than 1000 DEG C, the martensitic ratio generated increases, and intensity becomes too high.Therefore, quenching temperature is preferably defined as the scope of 850 ~ 1000 DEG C.The hold-time of Quench heating is not particularly limited.But, from the view point of productivity, be preferably 10 ~ 30 minutes.In addition, preferred Heating temperature is 920 ~ 980 DEG C.
After quench treatment, implement temper further.In temper, after being heated to the tempering temperature of 400 ~ 700 DEG C, cool with speed of cooling more than air cooling.When tempering temperature is lower than 400 DEG C, sufficient tempering effect can not be obtained.On the other hand, when the high temperature more than 700 DEG C, compound between easy precipitating metal, toughness, erosion resistance reduce.Therefore, tempering temperature is preferably defined as the temperature of the scope of 400 ~ 700 DEG C.In addition, the hold-time of tempering heating is not particularly limited.But, from the view point of productivity, be preferably 20 ~ 60 minutes.In addition, preferred tempering temperature is 550 ~ 650 DEG C.
In addition, also quench treatment can not implemented to keeping the steel pipe of tubulation state only to implement above-mentioned temper.
The weldless steel tube obtained by above-mentioned manufacture method be above-mentioned composition, wall thickness is greater than the oil well high-strength stainless steel seamless tube of the heavy wall of 25.4mm, it has as undertissue: take martensitic phase as principal phase, second-phase comprises the ferritic phase of 10 ~ 60% and the austenite phase of 0 ~ 10% in volume fraction, and with the quantity of the ferrite-martensite crystal boundary existed in the per unit length of the line segment marked along wall thickness direction definition GSI value in wall thickness central portion for more than 120.
In the present invention, in order to ensure desired high strength, to be formed with martensitic phase be principal phase, be the ferritic phase of 10 ~ 60% with volume fraction, the austenite of 0 ~ 10% tissue that is second-phase.
When the volume fraction of ferritic phase is less than 10%, hot workability reduces.On the other hand, when ferritic phase increases and is greater than 60%, intensity and toughness reduce.In addition, as the second-phase beyond ferritic phase, the austenite phase of less than 10% can be considered, but from the view point of guaranteeing intensity, preferably few as much as possible, comprise 0%.When austenite increases mutually and is greater than 10%, desired high strength can not be guaranteed.
Steel pipe of the present invention has as undertissue: comprise above-mentioned martensitic phase and ferritic phase, or comprise residual austenite phase further, and with the quantity of the ferrite-martensite crystal boundary existed in the per unit length of the line segment marked along wall thickness direction definition GSI value in wall thickness central portion for more than 120.When GSI value is less than 120, the miniaturization of tissue can not be realized, can not stably guarantee desired toughness.
In addition, GSI value (bar/mm) utilizes Wei Liela etching solution to corrode, use utilizes opticmicroscope (multiplying power: 100 ~ 1000 times) observable macrograph, wall thickness direction measures the quantity (bar/mm) of ferrite-martensite crystal boundary and the value obtained.
Below, the present invention is further illustrated based on embodiment.
Embodiment
After melting is carried out in the molten steel converter of composition table 1 Suo Shi, continuous metal cast process is utilized to make steel billet (diameter 260mm: the former material of steel).After former for obtained steel material is heated to the temperature shown in table 2, implement, successively via tapping machine, elongating mill, plug mill, reeling mill or further via the hot rolling of the common Mannesmann plug mill mode of sizing mill, to make weldless steel tube (external diameter 168.3 ~ 297mm φ × wall thickness 26 ~ 34mm) in the mode making the rolling rate in 1100 ~ 900 DEG C of temperature ranges reach condition shown in table 2.In addition, after hot rolling terminates, cool under the conditions shown in Table 2.Under the conditions shown in Table 2 quenching-temper is implemented to obtained weldless steel tube further.
Cut test film from obtained steel pipe, investigate structure observation, tensile properties, toughness, erosion resistance.Investigation method is as described below.
(1) structure observation
Structure observation test film is cut from the wall thickness central part of obtained steel pipe, cross section, wall thickness direction is ground, utilize Wei Liela etching solution to corrode, utilize opticmicroscope (opticalmicroscope) (multiplying power: 100 ~ 1000 times) tissues observed.Judged the kind of tissue by obtained macrograph, use image analysis to calculate the ratio (volume fraction) of ferritic phase.
In addition, austenite (γ) uses X-ray diffraction method (X-lay diffraction method) to measure mutually.Measure the diffracting X-rays integrated intensity in (220) face of γ, (211) face of ferritic phase (α), use following formula to convert.
γ (volume fraction)=100/{1+ (I α R γ/I γ R α) }
At this, the integrated intensity of I α: α,
The integrated intensity of I γ: γ,
The crystallographic calculated value of R α: α
The crystallographic calculated value of R γ: γ
In addition, the ratio of martensitic phase calculates with the form of the surplus beyond these phases.
In addition, for structure observation test film, use Wei Liela etching solution to corrode, utilize opticmicroscope (multiplying power: 400 times) to observe.According to obtained macrograph, wall thickness direction measures the quantity (bar/mm) of ferrite-martensite crystal boundary, calculates GSI value.
(2) tensile properties
According to API standard, the mode being tube axial direction to make draw direction cuts API arcuation tension test sheet (strip specimen specified by APIstandard, punctuate spacing gage length 50.8mm) from the wall thickness central part of obtained steel pipe.According to the tension test of API standard implementation, measure tensile properties (yield strength YS, tensile strength TS, elongation El).
(3) toughness
According to iso standard, the mode being test film length direction to make circumferential direction cuts V-notch test film (10mm is thick), in test temperature from the wall thickness central part of obtained steel pipe: implement Charpy impact test at-10 DEG C, measures and absorbs energy vE -10(J).In addition, test film number respectively gets 3, obtains their arithmetical av, as the value of each steel pipe.
(4) erosion resistance
Corrosion test sheet (size: 3mm is thick × 25mm is wide × 50mm is long) is cut, for corrosion test from the wall thickness central part of obtained steel pipe.
About corrosion test, corrosion test sheet be impregnated in and remain on the 20%NaCl aqueous solution in autoclave (liquid temperature: 230 DEG C, with the CO of 3.0MPa 2gas carries out saturated) in, be 14 days during making dipping, thus implement corrosion test.After test, gravimetry, is undertaken calculating by the loss of weight of test film and obtains corrosion speed.In addition, utilize multiplying power to be corrosion test sheet after the magnifying glass viewing test of 50 times, observe with or without spot corrosion.Be that the situation of the spot corrosion of more than 0.2mm has been denoted as spot corrosion by observing diameter.
The result obtained is shown in Table 3.
For the present invention's example, even if the steel pipe of heavy wall, also all there is high strength and the vE of more than 758MPa (110ksi) -10(J): the high tenacity of more than 40J.Even and if become at high temperature and contain CO 2, Cl -harsh environment under also there is corrosion weight loss be below 0.127mm/ and the steel pipe that spot corrosion erosion resistance excellent so does not occur.
On the other hand, the comparative example departing from the scope of the invention fails to guarantee desired high strength, or GSI is lower than 120 and vE -10(J) lower than 40J, fail stably to obtain high tenacity, or corrosion weight loss is greater than 0.127mm/, erosion resistance reduces.

Claims (6)

1. a wall thickness is greater than the manufacture method of the oil well high-strength stainless steel seamless tube of 25.4mm, it is made weldless steel tube and further this weldless steel tube is cooled to the manufacture method of the weldless steel tube of room temperature with speed of cooling more than air cooling for heating, implement to comprise the hot rolling of drilling/rolling to the former material of steel pipe, it is characterized in that
The former material of described steel pipe has following composition: in mass %, containing C:0.005 ~ 0.06%, Si:0.05 ~ 0.5%, Mn:0.2 ~ 1.8%, below P:0.03%, below S:0.005%, Cr:15.5 ~ 18.0%, Ni:1.5 ~ 5.0%, V:0.02 ~ 0.2%, Al:0.002 ~ 0.05%, N:0.01 ~ 0.15%, below O:0.006%, and contain in the mode meeting following (1) formula and following (2) formula and be selected from Mo:1.0 ~ 3.5%, below W:3.0%, one kind or two or more in below Cu:3.5%, surplus is made up of Fe and inevitable impurity,
The described hot rolling comprising drilling/rolling is the total rolling rate in 1100 ~ 900 DEG C of temperature ranges is the rolling of more than 30%, after this rolling, be cooled to described room temperature, then implements Q-tempering process or temper further,
Cr+0.65Ni+0.60Mo+0.30W+0.55Cu-20C≥19.5…(1)，
Cr+Mo+0.50W+0.30Si-43.5C-0.4Mn-Ni-0.3Cu-9N≥11.5…(2)，
At this, Cr, Mo, W, Si, C, Mn, Ni, Cu, N are the quality % content of each element.
2. the oil well as claimed in claim 1 manufacture method of high-strength stainless steel seamless tube, it is characterized in that, on the basis of described composition, in mass %, one kind or two or more containing what be selected from below Nb:0.2%, below Ti:0.3%, below Zr:0.2%, below B:0.01% further.
3. the oil well manufacture method of high-strength stainless steel seamless tube as claimed in claim 1 or 2, is characterized in that, on the basis of described composition, in mass %, further containing below Ca:0.01%.
4. wall thickness is greater than an oil well high-strength stainless steel seamless tube of 25.4mm, it is characterized in that,
There is following composition: in mass %, containing C:0.005 ~ 0.06%, Si:0.05 ~ 0.5%, Mn:0.2 ~ 1.8%, below P:0.03%, below S:0.005%, Cr:15.5 ~ 18.0%, Ni:1.5 ~ 5.0%, V:0.02 ~ 0.2%, Al:0.002 ~ 0.05%, N:0.01 ~ 0.15%, below O:0.006%, and contain in the mode meeting following (1) formula and following (2) formula and be selected from Mo:1.0 ~ 3.5%, below W:3.0%, one kind or two or more in below Cu:3.5%, surplus is made up of Fe and inevitable impurity,
Have as undertissue: take martensitic phase as principal phase, second-phase comprises the ferritic phase of 10 ~ 60% and the austenite phase of 0 ~ 10% in volume fraction, and with the quantity of the ferrite-martensite crystal boundary existed in the per unit length of the line segment marked along wall thickness direction definition GSI value in wall thickness central portion for more than 120
And have excellent low-temperature flexibility and excellent erosion resistance concurrently,
Cr+0.65Ni+0.60Mo+0.30W+0.55Cu-20C≥19.5…(1)，
Cr+Mo+0.50W+0.30Si-43.5C-0.4Mn-Ni-0.3Cu-9N≥11.5…(2)，
At this, Cr, Mo, W, Si, C, Mn, Ni, Cu, N are the quality % content of each element.
5. oil well high-strength stainless steel seamless tube as claimed in claim 4, it is characterized in that, on the basis of described composition, in mass %, one kind or two or more containing what be selected from below Nb:0.2%, below Ti:0.3%, below Zr:0.2%, below B:0.01% further.
6. the high-strength stainless steel seamless tube of the oil well as described in claim 4 or 5, is characterized in that, on the basis of described composition, in mass %, further containing below Ca:0.01%.
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JP6604093B2 (en) * 2015-09-01 2019-11-13 日本製鉄株式会社 Oil well pipe
WO2017138050A1 (en) * 2016-02-08 2017-08-17 Ｊｆｅスチール株式会社 High strength stainless steel seamless pipe for oil well and manufacturing method therefor
JP6156609B1 (en) * 2016-02-08 2017-07-05 Ｊｆｅスチール株式会社 High strength stainless steel seamless steel pipe for oil well and method for producing the same
MX2019000964A (en) * 2016-07-27 2019-06-10 Jfe Steel Corp High strength seamless stainless steel pipe for oil wells and production method therefor.
RU2716438C1 (en) * 2017-02-24 2020-03-12 ДжФЕ СТИЛ КОРПОРЕЙШН Seamless high-strength pipe from stainless steel of oil-field range and method of its manufacturing
CN110462085A (en) * 2017-03-28 2019-11-15 日本制铁株式会社 Martensitic stainless steel
JP7107370B2 (en) 2018-07-09 2022-07-27 日本製鉄株式会社 Seamless steel pipe and its manufacturing method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1840731A (en) * 2005-03-31 2006-10-04 住友金属工业株式会社 Manufacturing method of seamless steel pipe for mechanical structural parts
CN1875121A (en) * 2003-10-31 2006-12-06 杰富意钢铁株式会社 High strength stainless steel pipe for line pipe excellent in corrosion resistance and method for production thereof

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52152814A (en) * 1976-06-14 1977-12-19 Nippon Steel Corp Thermo-mechanical treatment of seamless steel pipe
JP5109222B2 (en) 2003-08-19 2012-12-26 Ｊｆｅスチール株式会社 High strength stainless steel seamless steel pipe for oil well with excellent corrosion resistance and method for producing the same
JP4462005B2 (en) * 2003-10-31 2010-05-12 Ｊｆｅスチール株式会社 High strength stainless steel pipe for line pipe with excellent corrosion resistance and method for producing the same
WO2005042793A1 (en) * 2003-10-31 2005-05-12 Jfe Steel Corporation High strength stainless steel pipe for line pipe excellent in corrosion resistance and method for production thereof
JP4792778B2 (en) * 2005-03-29 2011-10-12 住友金属工業株式会社 Manufacturing method of thick-walled seamless steel pipe for line pipe
JP4635764B2 (en) * 2005-07-25 2011-02-23 住友金属工業株式会社 Seamless steel pipe manufacturing method
JP4893196B2 (en) * 2006-09-28 2012-03-07 Ｊｆｅスチール株式会社 High strength stainless steel pipe for oil well with high toughness and excellent corrosion resistance
BRPI0909042B8 (en) 2008-03-28 2020-05-05 Nippon Steel & Sumitomo Metal Corp stainless steel used for tubular products used in oil fields
AR073884A1 (en) * 2008-10-30 2010-12-09 Sumitomo Metal Ind STAINLESS STEEL TUBE OF HIGH RESISTANCE EXCELLENT IN RESISTANCE TO FISURATION UNDER VOLTAGE SULFURS AND CORROSION OF GAS OF CARBONIC ACID IN HIGH TEMPERATURE.
EP2389181A1 (en) * 2009-01-26 2011-11-30 NeuroSearch A/S Novel indolyl-oxadiazolyl-diazabicyclononane derivatives and their medical and diagnostical use
AR076669A1 (en) * 2009-05-18 2011-06-29 Sumitomo Metal Ind STAINLESS STEEL FOR PETROLEUM WELLS, STAINLESS STEEL TUBE FOR PETROLEUM WELLS, AND STAINLESS STEEL MANUFACTURING METHOD FOR PETROLEUM WELLS
WO2011021396A1 (en) * 2009-08-21 2011-02-24 住友金属工業株式会社 Method for manufacturing thick-walled seamless steel pipe
MX2012012435A (en) * 2010-04-28 2013-03-05 Nippon Steel & Sumitomo Metal Corp High-strength stainless steel for oil well and high-strength stainless steel pipe for oil well.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1875121A (en) * 2003-10-31 2006-12-06 杰富意钢铁株式会社 High strength stainless steel pipe for line pipe excellent in corrosion resistance and method for production thereof
CN1840731A (en) * 2005-03-31 2006-10-04 住友金属工业株式会社 Manufacturing method of seamless steel pipe for mechanical structural parts

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106399865A (en) * 2016-11-17 2017-02-15 无锡明盛纺织机械有限公司 High-temperature-resistant and abrasion-resistant material for circulating fluidized bed boiler
CN107433428A (en) * 2017-08-22 2017-12-05 苏州双金实业有限公司 A kind of processing method of stainless-steel pipe easy to operate
WO2024125408A1 (en) * 2022-12-13 2024-06-20 钢铁研究总院有限公司 Highly corrosion-resistant high-toughness steel and preparation method therefor
WO2024125407A1 (en) * 2022-12-13 2024-06-20 钢铁研究总院有限公司 Highly corrosion-resistant oil well steel pipe and preparation method therefor
CN116732297A (en) * 2023-08-16 2023-09-12 中北大学 Niobium-containing high-strength dual-phase steel and preparation method and application thereof
CN116732297B (en) * 2023-08-16 2023-10-20 中北大学 A kind of niobium-containing high-strength dual-phase steel and its preparation method and application

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