CN100412222C - Seamless steel tubes and pipes for use in oil well - Google Patents
Seamless steel tubes and pipes for use in oil well Download PDFInfo
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- CN100412222C CN100412222C CNB2006100679770A CN200610067977A CN100412222C CN 100412222 C CN100412222 C CN 100412222C CN B2006100679770 A CNB2006100679770 A CN B2006100679770A CN 200610067977 A CN200610067977 A CN 200610067977A CN 100412222 C CN100412222 C CN 100412222C
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 91
- 239000010959 steel Substances 0.000 title claims abstract description 91
- 239000003129 oil well Substances 0.000 title claims abstract description 28
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 19
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 19
- 239000012535 impurity Substances 0.000 claims abstract description 16
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 10
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 10
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 9
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 8
- 229910052796 boron Inorganic materials 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 abstract description 14
- 238000005336 cracking Methods 0.000 abstract description 13
- 230000007797 corrosion Effects 0.000 abstract description 8
- 238000005260 corrosion Methods 0.000 abstract description 8
- 238000010791 quenching Methods 0.000 abstract description 8
- 229910052758 niobium Inorganic materials 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- 230000002708 enhancing effect Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 19
- 238000012360 testing method Methods 0.000 description 16
- 229910052761 rare earth metal Inorganic materials 0.000 description 7
- 238000005496 tempering Methods 0.000 description 7
- 230000000171 quenching effect Effects 0.000 description 6
- 208000037656 Respiratory Sounds Diseases 0.000 description 5
- 239000013078 crystal Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 150000004767 nitrides Chemical class 0.000 description 4
- 238000004134 energy conservation Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910000734 martensite Inorganic materials 0.000 description 3
- 239000006104 solid solution Substances 0.000 description 3
- 238000007669 thermal treatment Methods 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 1
- 229910001374 Invar Inorganic materials 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C22C38/04—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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
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- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
Disclosed are seamless steel tubes for oil well use, comprising C: 0.14-0.35%, Si: 0.05-1.0%, Mn: 0.05-2.0%, Cr: 0.05-1.5%, Mo: 0.05-2.0%, Ti: 0-0.05%, V: 0-0.1%, and Al: not less than 0.010%, wherein the concentration product by Al and N content, corrected by Ti and V, is within the range of 0.00001 to 0.00050, and the residuals are Fe and impurities including P: 0.025% or less, and S: 0.010% or less. Ti, V, Nb, or B is preferably contained to enhance the quench hardenability as well as the resistance to sulfide stress corrosion cracking, and further Ca, Mg and/or REM is preferably contained to improve the shape of non-metallic inclusions, enhancing the resistance to sulfide stress corrosion cracking. Thus, said tubes by the invention can be produced by efficient means realizing energy savings, and widely used as ones having excellent stability in mechanical strength.
Description
Technical field
The present invention relates to a kind of oil well seamless steel pipe, the intensity change that relates to tensile strength etc. in detail is few, the oil well seamless steel pipe of strength stability excellence.
Background technology
Compare with welded tube, the weldless steel tube that reliability is high is used in abominable oil well environment and hot environment more, requires high strength, toughness on stable intensity based to improve and the raising of acidproof corruption (sour) property usually.
For example, open in the 2001-73086 communique, disclose the relational expression that makes V, Nb, Ti, Cr and Mo containing ratio satisfy regulation,, suppress getable M by the weldless steel tube of so adjusting is carried out Q-tempering the spy
23C
6The generation of the carbide of type has the weldless steel tube of high tenacity and high corrosion resistance therefrom.
In order to satisfy these requirements, importantly realize the stabilization of intensity, particularly, be considered to realize the change in a narrow margin of strength range in the steel pipe of necessity in acidproof corruption.In addition, in general oil well pipe, the external pressure owing in the oil well that the intensity change (strength variance) of invar pipe causes also might occur and make oil well pipe partly be out of shape, the strength stability of steel pipe becomes requisite key element.
All the time,, preferably make steel pipe form the tempered martensite of homogeneous,, need the change in a narrow margin of the element containing ratio of C, Mn, Cr, Mo etc., but only this can't realize stable intensity in order to adjust hardenability in order to realize intensity stabilizationization.This is external recently, with the raising of production efficiency, use reduction, the cost of the energy rationally to turn to purpose, substitutes existing off-line thermal treatment and has adopted online thermal treatment.In this online thermal treatment, there is hardenability variation, and can't obtains the problem of stable intensity owing to the change of old austenitic grain size number.
As mentioned above, in order to suppress change by the hardenability due to the change of old austinite grain size etc., and obtain having the oil well seamless steel pipe of stable high strength, high tenacity and acidproof corruption, also leave the problem that must solve.
Summary of the invention
The present invention is in view of above-mentioned such situation, and its problem is, propose a kind of can be can realize the oil well seamless steel pipe of the strength stability excellence that energy-conservation effective mechanism makes.
Present inventors in order to solve above-mentioned problem, according to existing problem points, make with regard to the steel of the oil well seamless steel pipe of strength stability excellence and to inquire into, and draw the main understanding shown in following (a)～(d), thereby the present invention is finished.
(a) in order to reduce because the change of the hardness of steel due to the change of the hardenability of steel pipe, be controlled in the specialized range amount of separating out of the AlN in the steel very important, needing will be as the Al containing ratio (quality %) of its index, with according to the Ti that forms nitride and N containing ratio (quality %) that the V containing ratio is revised (below, be also referred to as " revise N containing ratio ") concentration long-pending (below, also be designated as " Al * { N-14 * (Ti/144+V/153) } ") value, be adjusted in 0.00001～0.00050 the scope.
(b) concentration is long-pending, the value of Al * { N-14 * (Ti/144+V/153) } is adjusted at the reasons are as follows in the scope of above-mentioned (a) and states.That is because if the long-pending value of above-mentioned concentration surpasses 0.00050 to uprise, then AlN to separate out quantitative change many, so thickization of crystal grain is suppressed, the hardenability of steel pipe reduces.On the other hand, when the long-pending value of above-mentioned concentration is lower than 0.00001 because AlN to separate out quantitative change few, so coarsening, the hardenability of steel pipe rises.The change of the quenching of the steel pipe that takes place in order to suppress so realizes the stabilization of intensity, need the value that above-mentioned concentration is long-pending be adjusted in the scope that above-mentioned (a) write down.
(c) guarantee the intensity of steel pipe in order to improve hardenability, and prevent that flexible from reducing, can adjust C, Si, Mn and Cr content, in addition, in order to improve hardenability, and improve the crackle of anti-sulphide stress corrosion property, can adjust Mo content, it respectively effectively.
(d) because if Ti is contained, then N fixes as nitride, and B is existed with solid solution condition, so hardenability is improved, in addition, if V is contained, then fine carbide is separated out when tempering, thereby can realize that intensity rises.Because Nb forms carbonitride, in addition, owing to B improves hardenability martensite volume is increased, thereby make the raising of the crackle of anti-sulphide stress corrosion property respectively.In addition by contain among Ca, Mg and the REM more than a kind, can improve the form of inclusion and resistance to sulfide stress cracking is improved.
The present invention finishes based on above-mentioned understanding, is that its main idea comprises the oil well seamless steel pipe shown in following (1)～(4).
(1) a kind of oil well seamless steel pipe, it is characterized in that, in quality %, contain C:0.14～0.35%, Si:0.05～1.0%, Mn:0.05～2.0%, Cr:0.05～1.5%, Mo:0.05～2.0%, Ti:0～0.05%, V:0～0.1% and more than the Al:0.010%, and Al, N, Ti and V content satisfy the relation of being given by following (1) formula, and remainder is made up of Fe and impurity, P in the impurity is below 0.025%, and S is below 0.010%.
0.00001≤Al×{N-14×(Ti/144+V/153)}≤0.00050......(1)
Wherein, the symbol of element in (1) formula, the containing ratio (quality %) of each element that is illustrated in the steel to be contained.
(2) a kind of oil well seamless steel pipe, it is characterized in that, in quality %, contain C:0.14～0.35%, Si:0.05～1.0%, Mn:0.05～2.0%, Cr:0.05～1.5%, Mo:0.05～2.0%, Ti:0～0.05%, V:0～0.1% and more than the Al:0.010%, also contain a kind or 2 kinds in Nb:0.005～0.040% and B:0.0003～0.005%, and, Al, N, Ti and V content satisfy the relation of being given by described (1) formula, remainder is made up of Fe and impurity, P in the impurity is below 0.025%, and S is below 0.010%.
(3) a kind of oil well seamless steel pipe, it is characterized in that, in quality %, contain C:0.14～0.35%, Si:0.05～1.0%, Mn:0.05～2.0%, Cr:0.05～1.5%, Mo:0.05～2.0%, Ti:0～0.05%, V:0～0.1% and more than the Al:0.010%, also contain Ca:0.0003～0.005%, in Mg:0.0003～0.005% and REM:0.0003～0.005% more than a kind or 2 kinds, and, Al, N, Ti and V content satisfy the relation of being given by described (1) formula, remainder is made up of Fe and impurity, P in the impurity is below 0.025%, and S is below 0.010%.
(4) a kind of oil well seamless steel pipe, it is characterized in that, in quality %, contain C:0.14～0.35%, Si:0.05～1.0%, Mn:0.05～2.0%, Cr:0.05～1.5%, Mo:0.05～2.0%, Ti:0～0.05%, V:0～0.1% and more than the Al:0.010%, also contain a kind or 2 kinds in Nb:0.005～0.040% and B:0.0003～0.005%, contain Ca:0.0003～0.005% in addition, in Mg:0.0003～0.005% and REM:0.0003～0.005% more than a kind or 2 kinds, and Al, N, Ti and V content satisfy the relation of being given by described (1) formula, remainder is made up of Fe and impurity, P in the impurity is below 0.025%, and S is below 0.010%.
In the present invention, so-called " strength stability excellence ", the meaning are that the intensity change of the tensile strength of steel etc. is little, its detailed content aftermentioned.
Also have, in the following description, " quality % " brief note is " % ".
Description of drawings
Fig. 1 is expression to the change Al of the yield strength YS of the steel pipe of having implemented Q-tempering and handling and revises the figure of the influence of N containing ratio.
Embodiment
The present invention is a kind of oil well seamless steel pipe, it is characterized in that, as described, contain C:0.14～0.35%, Si:0.05～1.0%, Mn:0.05～2.0%, Cr:0.05～1.5%, Mo:0.05～2.0%, Ti:0～0.05%, V:0～0.1% and more than the Al:0.010%, and Al, N, Ti and V content satisfy the relation of being given by described (1) formula, remainder is made up of Fe and impurity, and the P in the impurity is below 0.025%, and S is below 0.010%.Below, further describe the reason and the preferable range that limit scope of the present invention as described.
C：
C contains for the purpose of the intensity of guaranteeing oil well seamless steel pipe.When its containing ratio is lower than 0.14%, hardenability is not enough and can not improve tempering temperature, is difficult to guarantee necessary rigidity energy.On the other hand, uprise, then hardening crack generation, in addition the toughness deterioration if containing ratio surpasses 0.35%.From above reason, the proper range of C containing ratio is made as 0.14～0.35%.Also have, the preferable range of C containing ratio is 0.16～0.28%, and more preferably scope is 0.20～0.28%.
Si：
Si is except having desoxydatoin, also has the hardenability that improves steel, and makes the element of the effect of strength enhancing, in order to obtain this effect, needs the containing ratio more than 0.05%.But, if surpassing 1.0%, its containing ratio uprises, then resistance to sulfide stress cracking reduces.Therefore, the proper range with the Si containing ratio is made as 0.05～1.0%.Also have, the preferable range of Si containing ratio is 0.1～0.5%.
Mn：
Mn has desoxydatoin, and has the hardenability that improves steel, makes the element of the effect of strength enhancing, in order to obtain this effect, need make it to contain more than 0.05%.But, if surpassing 2.0%, its containing ratio uprises, then component segregation increases, and toughness is reduced.Therefore, the proper range with the Mn containing ratio is made as 0.05～2.0%.
P：
P is the impurity element in the steel, brings toughness to reduce at grain boundary segregation, particularly, uprises if its containing ratio surpasses 0.025%, and toughness is significantly reduced.Therefore, the proper range with the P containing ratio is made as below 0.025%.Also have, the P containing ratio is preferably below 0.020%.
S：
S also is the impurity in the steel, combines with Mn or Ca to form inclusion.If the S containing ratio surpasses 0.010%, then is cause with the inclusion, it is big that the toughness of steel and the deterioration of resistance to sulfide stress cracking become.Therefore, the proper range with the S containing ratio is made as below 0.010%.Also have, the S containing ratio is preferably below 0.005%.
Cr：
Cr is for the hardenability effective elements that improves steel, in order to make this effect performance, need make it to contain more than 0.05%.But, if surpassing 1.5%, its containing ratio uprises, then the toughness of steel and resistance to sulfide stress cracking reduce.Therefore, the proper range with the Cr containing ratio is made as 0.05～1.5%.Also have, the preferable range of Cr containing ratio is 0.2～1.2%.
Mo：
Mo is that the hardenability that improves steel is guaranteed high strength, and to improving the resistance to sulfide stress cracking effective elements.In order to obtain these effects, need make the Mo containing ratio is more than 0.05%.But, if surpassing 2.0%, the Mo containing ratio uprises, then toughness and resistance to sulfide stress cracking reduce.Because above-mentioned reason, the proper range of Mo containing ratio is made as 0.05～2.0%.Also have, the preferable range of Mo containing ratio is 0.1～0.8%.
Al：
Al has desoxydatoin, for the toughness and the processibility effective elements that improve steel.Also have, when the Al containing ratio is lower than 0.010%, solid solution C measures increase, consequently significantly promotes intensity.Therefore, the proper range with the Al containing ratio is made as more than 0.010%.Also have, the preferred upper limit value of Al containing ratio is 0.080%.
The qualification reason of Al, the N of relational expression (1), Ti and V containing ratio:
As mentioned above, the concentration of Al containing ratio and N containing ratio is long-pending, and the value of Al * { N-14 * (Ti/144+V/153) } is adjusted at the reasons are as follows according to the scope of the represented value of following (1) formula.
0.00001≤Al×{N-14×(Ti/144+V/153)}≤0.00050......(1)
Above-mentioned concentration is long-pending, and the value of Al * { N-14 * (Ti/144+V/153) } is the index that is illustrated in the degree that ALN separates out in the steel, uprises if the long-pending value of concentration surpasses 0.00050, and then the AlN amount of separating out in steel increases.Consequently, thickization of crystal grain is suppressed, and the hardenability of steel pipe reduces.On the other hand, the value long-pending when concentration is lower than 0.00001, and the amount of separating out of the AlN in steel reduces, consequently coarsening, and the hardenability of steel pipe rises.From these reasons, suppress as above-mentioned and the reduction of the hardenability of the steel pipe that takes place and with the change of the hardenability of over-drastic rising generation, represented according to above-mentioned (1), the proper range of establishing the long-pending value of the concentration that is used to make intensity stabilizationization is 0.00001～0.00050.Also have, the preferable range of the value that concentration is long-pending is 0.00003～0.0003.
Fig. 1 is expression to the change Al of the yield strength YS of the steel pipe of having implemented Q-tempering and handling and revises the figure of the influence of N containing ratio.
In same figure, the size of the change of the yield strength YS of steel pipe is estimated according to (2) described later formula.That is, zero mark among the figure, the change of expression intensity is little, also has ● mark, and the change of expression intensity is big.
Shown in figure, the proper range of Al containing ratio and correction N containing ratio satisfies above-mentioned (1) formula, and in addition, the Al containing ratio forms the zone more than 0.010%.
Below, the 1st group and the 2nd group composition and composition making it to contain as required are described.
The 1st group is Ti, V, Nb and B, contains more than a kind or 2 kinds of these elements as required.
Ti：
Ti is by the N in the steel is fixed as nitride, when quenching B is existed in steel with solid solution condition, thereby makes hardenability improve the element of effect performance.Can contain also and can not contain, but contain by making it, can access above-mentioned effect.But, uprise, then remain in the steel, resistance to sulfide stress cracking is reduced as thick nitride if the containing ratio of Ti surpasses 0.05%.From above-mentioned reason, will be made as 0～0.05% in the scope that makes Ti contain containing ratio sometimes.Also have, the preferable range of containing ratio is 0.005～0.025%.
B：
B is by hardenability being improved, martensite volume is increased, and has the element of the effect that improves the crackle of anti-sulphide stress corrosion property, even its containing ratio is the value of impurity level, also has this effect.Can contain also and can not contain, but in order to obtain this effect more significantly, preferred containing ratio more than 0.0003%.But, if surpassing 0.005%, the B containing ratio uprises, then the toughness of steel reduces.Therefore, will be made as 0.0003～0.005% in the scope that makes B contain containing ratio sometimes.Also have, the preferable range of containing ratio is 0.0003～0.003%.
V：
V is by separating out as trickle carbide when the tempering, thereby has the element of the effect of the intensity that improves steel.Can contain also and can not contain, but can access above-mentioned effect by making it to contain.On the other hand, uprise if its containing ratio surpasses 0.3%, then the toughness of steel reduces.From these reasons, will be made as 0～0.3% in the scope that makes V contain V containing ratio sometimes.
Nb：
Nb prevents thickization of crystal grain by forming carbonitride at high-temperature area, thereby has the element of the effect of the toughness that improves steel and the crackle of anti-sulphide stress corrosion property.Can contain also and can not contain, but, can access this effect by containing ratio is made as more than 0.005%.On the other hand, uprise if its containing ratio surpasses 0.040%, then excessive thickization of carbonitride reduces resistance to sulfide stress cracking.Therefore, will be made as 0.005～0.040% in the scope that makes it to contain Nb containing ratio sometimes.Also have, the preferable range of containing ratio is 0.010～0.030%.
The 2nd group is Ca, Mg and REM.
These elements can contain also and can not contain, but make it to contain sometimes, any all with steel in S reaction and formation sulfide, improve the form of inclusion thus, have the effect of the resistance to sulfide stress cracking raising that makes steel.When expecting above-mentioned effect, among Ca, Mg and REM (rare earth elements such as Ce, La, Y), select to make it respectively to contain more than 0.0005% more than a kind or 2 kinds, can access this effect thus.On the other hand, if any its containing ratio of element surpasses 0.005%,, and resistance to sulfide stress cracking is reduced then because the inclusion amount in the steel increases, and the purity of steel reduces.From above-mentioned reason, will make these elements contain the scope of containing ratio sometimes, any element is all established and is 0.0005～0.005%.
Embodiment
In order to confirm the effect of oil well seamless steel pipe of the present invention, and carry out following test, estimate its result.
By have 22 kinds that the chemical ingredients shown in table 1 and the table 2 forms for the examination steel, make the steel billet of external diameter 225mm, be heated after 1250 ℃, according to mannesmann piercer (Mannesmann mandrel) tubulation method, form the weldless steel tube of external diameter 244.5mm, wall thickness 13.8mm.Then, this weldless steel tube is implemented to quench and temper, take the tension test sheet.
Here, quenching is by after the homogeneous concurrent heating in 950 ℃, 5 minutes, the water quenching of carrying out, and in addition, tempering is by with the steel pipe after the above-mentioned quenching, carries out soaking in 30 minutes and carries out at 650 ℃.Also have, above-mentioned treatment condition are examples, and the quenching and the temper of weldless steel tube of the present invention are not limited.
In addition, tension test be from tension test with the lengthwise direction of Guan Gang, take circular-arc tension test sheet with the parallel portion cross section of the 5CT defined of API specification, implement tension test and measure yield strength YS (MPa).
In addition, try to achieve the change (deviation) of yield strength YS based on above-mentioned measurement result, valence stability is represented in the lump at described table 2.
Also have, in table 2, the change of yield strength YS is tried to achieve by following method, estimates according to 2 stages.That is,, implement the inferior above-mentioned tension test in 10 (N number=10) to the confession examination steel of each steel numbering system, to satisfy the related situation of following (2) formula, little as the change of TS is good (zero), will not satisfy the situation of the relation of (2) formula, as the change greatly bad (*) of YS.
Each YS≤average YS-3 * each YS standard deviation ... (2)
Here be expressed as respectively, " average T S " whole average YS for examination steel (22 kinds) for being provided in to test, " each YS " is the average YS of object for examination steel (a kind), then, " each YS standard deviation " is the standard deviation of object for examination steel (a kind).
Test number 1～12 is the examples of the present invention that adopt as the steel numbering system 1～12 of steel of the present invention, and test number 13～22 is to adopt the comparative example of the steel numbering system 13～22 of steel as a comparison.
Adopt the test number 13～15 of the low steel numbering system 13～15 of Al containing ratio, the Al containing ratio is low with adopting, and concentration is long-pending, the test number 16 of the steel numbering system 16 that the value of Al * { N-14 * (Ti/144+V/153) } is high, the change of any yield strength YS is all big, and strength stability is bad.In addition, no matter within the scope of the invention whether the Al containing ratio, adopt concentration long-pending, the test number 17～22 of the steel numbering system 17～22 that the value of Al * { N-14 * (Ti/144+V/153) } is high, in it was any, the change of YS was all big, and strength stability is bad.
With respect to this, in the test number 1～12 of employing as the steel numbering system 1～12 of the steel of the present invention that all satisfies defined terms of the present invention, the change of any YS is all little, and strength stability is good.Particularly, contain in the steel numbering system 6,7,8 and 10 test number 6,7,8 and 10 of Ti, V, Nb or B in employing, because the raising of hardenability etc., can access higher intensity and the crackle of anti-sulphide stress corrosion property, in addition, in the test number more than a kind 6,8,9 and 10 in containing Ca, Mg and REM, can access higher resistance to sulfide stress cracking.
Industrial application
Oil well seamless steel pipe of the present invention, be a kind of can be can realize energy-conservation effective mechanism The oil well seamless steel pipe of the strength stability excellence of making. Particularly, locating through online heat Reason process and in the situation about making can suppress take the granularity change of old austenite crystal grain as cause The change of hardenability, thus stable high strength obtained. Therefore, oil well seamless steel pipe of the present invention, Be suitable as the oil well nothing that possesses the strength stability of under energy-conservation and production efficiency improve, producing The seam steel pipe enlarges on both side in the rationalization of manufacture process and purposes, also can be suitable for widely.
Claims (4)
1. oil well seamless steel pipe, it is characterized in that, in quality %, contain C:0.14～0.35%, Si:0.05～1.0%, Mn:0.05～2.0%, Cr:0.05～1.5%, Mo:0.05～2.0%, Ti:0～0.05%, V:0～0.1% and Al:0.010%～0.080%, and Al, N, Ti and V content satisfy the relation of being given by following formula (1), remainder is made up of Fe and impurity, P in the impurity is below 0.025%, and S is below 0.010%
0.00001≤Al×{N-14×(Ti/144+V/153)}≤0.00050……(1)
Wherein, the symbol of element in (1) formula, the containing ratio of each element that is illustrated in the steel to be contained, unit is quality %.
2. oil well seamless steel pipe according to claim 1 is characterized in that, substitutes the part of described Fe, also contains in Nb:0.005～0.040% and B:0.0003～0.005% a kind or 2 kinds in quality %.
3. oil well seamless steel pipe according to claim 1, it is characterized in that, substitute the part of described Fe, in quality % also contain in Ca:0.0003～0.005%, Mg:0.0003～0.005% and REM:0.0003～0.005% more than a kind or 2 kinds.
4. oil well seamless steel pipe according to claim 2, it is characterized in that, substitute the part of described Fe, in quality % also contain in Ca:0.0003～0.005%, Mg:0.0003～0.005% and REM:0.0003～0.005% more than a kind or 2 kinds.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005087462 | 2005-03-25 | ||
| JP2005087462A JP2006265668A (en) | 2005-03-25 | 2005-03-25 | Seamless steel tube for oil well |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1837394A CN1837394A (en) | 2006-09-27 |
| CN100412222C true CN100412222C (en) | 2008-08-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2006100679770A Expired - Fee Related CN100412222C (en) | 2005-03-25 | 2006-03-27 | Seamless steel tubes and pipes for use in oil well |
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| Country | Link |
|---|---|
| US (1) | US20060231168A1 (en) |
| JP (1) | JP2006265668A (en) |
| CN (1) | CN100412222C (en) |
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| AU2008221597B8 (en) * | 2007-03-30 | 2010-04-22 | Nippon Steel Corporation | Low alloy steel, seamless steel oil country tubular goods, and method for producing seamless steel pipe |
| MY144904A (en) * | 2007-03-30 | 2011-11-30 | Sumitomo Metal Ind | Low alloy steel for oil country tubular goods and seamless steel pipe |
| JP5020689B2 (en) * | 2007-04-17 | 2012-09-05 | 新日本製鐵株式会社 | Machine structure steel pipe with excellent machinability |
| EP2325435B2 (en) | 2009-11-24 | 2020-09-30 | Tenaris Connections B.V. | Threaded joint sealed to [ultra high] internal and external pressures |
| US20110253265A1 (en) * | 2010-04-15 | 2011-10-20 | Nisshin Steel Co., Ltd. | Quenched and tempered steel pipe with high fatigue life, and its manufacturing method |
| BR112012030096B1 (en) | 2010-06-08 | 2018-06-19 | Nippon Steel & Sumitomo Metal Corporation | STEEL FOR STEEL PIPE WITH EXCELLENT RESISTANCE TO CRACKING UNDER SULFET VOLTAGE |
| US9163296B2 (en) | 2011-01-25 | 2015-10-20 | Tenaris Coiled Tubes, Llc | Coiled tube with varying mechanical properties for superior performance and methods to produce the same by a continuous heat treatment |
| IT1403689B1 (en) | 2011-02-07 | 2013-10-31 | Dalmine Spa | HIGH-RESISTANCE STEEL TUBES WITH EXCELLENT LOW TEMPERATURE HARDNESS AND RESISTANCE TO CORROSION UNDER VOLTAGE SENSORS. |
| AR088424A1 (en) * | 2011-08-22 | 2014-06-11 | Nippon Steel & Sumitomo Metal Corp | STEEL TUBE FOR PETROLEUM WELL WITH EXCELLENT CORROSION RESISTANCE UNDER VOLTAGE SULFIDE PRESENCE |
| CN102392185B (en) * | 2011-10-28 | 2013-05-22 | 首钢总公司 | Normalized acid resistant hot-rolled steel plate and preparation method thereof |
| US9340847B2 (en) * | 2012-04-10 | 2016-05-17 | Tenaris Connections Limited | Methods of manufacturing steel tubes for drilling rods with improved mechanical properties, and rods made by the same |
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| CN103627962B (en) * | 2013-12-03 | 2015-11-18 | 内蒙古包钢钢联股份有限公司 | Thick oil thermal extraction weldless steel tube and preparation method thereof |
| CN103614631B (en) * | 2013-12-03 | 2015-09-30 | 内蒙古包钢钢联股份有限公司 | Containing the preparation method of rare earth production perforation gun tube body |
| RU2643735C1 (en) * | 2014-06-09 | 2018-02-05 | Ниппон Стил Энд Сумитомо Метал Корпорейшн | Low-alloyed steel pipe for oil well |
| CN104532168B (en) * | 2015-01-09 | 2016-06-15 | 江西理工大学 | High-quality Micro Alloying seamless steel tube for drilling and manufacture method thereof |
| CN104946975A (en) * | 2015-07-13 | 2015-09-30 | 攀钢集团成都钢钒有限公司 | Raw material steel of seamless steel pipe for drill pipe of rotary drilling rig and smelting method of raw material steel |
| US11124852B2 (en) | 2016-08-12 | 2021-09-21 | Tenaris Coiled Tubes, Llc | Method and system for manufacturing coiled tubing |
| US10434554B2 (en) | 2017-01-17 | 2019-10-08 | Forum Us, Inc. | Method of manufacturing a coiled tubing string |
| CN107338396A (en) * | 2017-06-28 | 2017-11-10 | 包头钢铁（集团）有限责任公司 | High-hardenability gas storage seamless steel pipe and its production method |
| CN109680209A (en) * | 2018-11-07 | 2019-04-26 | 林州凤宝管业有限公司 | A kind of N80 grade of steel Micro Alloying Oil Tube Steel and its method for preparing oil pipe |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001073086A (en) * | 1999-09-06 | 2001-03-21 | Sumitomo Metal Ind Ltd | Seamless steel tube with high toughness and high corrosion resistance |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5938865A (en) * | 1995-05-15 | 1999-08-17 | Sumitomo Metal Industries, Ltc. | Process for producing high-strength seamless steel pipe having excellent sulfide stress cracking resistance |
| KR100514119B1 (en) * | 2000-02-28 | 2005-09-13 | 신닛뽄세이테쯔 카부시키카이샤 | Steel pipe having excellent formability and method for production thereof |
-
2005
- 2005-03-25 JP JP2005087462A patent/JP2006265668A/en active Pending
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2006
- 2006-03-24 US US11/387,747 patent/US20060231168A1/en not_active Abandoned
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001073086A (en) * | 1999-09-06 | 2001-03-21 | Sumitomo Metal Ind Ltd | Seamless steel tube with high toughness and high corrosion resistance |
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| Publication number | Publication date |
|---|---|
| JP2006265668A (en) | 2006-10-05 |
| CN1837394A (en) | 2006-09-27 |
| US20060231168A1 (en) | 2006-10-19 |
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