CN102839333B - Steel, oil pumping rod containing same and application of steel - Google Patents
Steel, oil pumping rod containing same and application of steel Download PDFInfo
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- CN102839333B CN102839333B CN201210371921.XA CN201210371921A CN102839333B CN 102839333 B CN102839333 B CN 102839333B CN 201210371921 A CN201210371921 A CN 201210371921A CN 102839333 B CN102839333 B CN 102839333B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 69
- 239000010959 steel Substances 0.000 title claims abstract description 69
- 238000005086 pumping Methods 0.000 title abstract description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 31
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 14
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 14
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 13
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 13
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 13
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 13
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 13
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910017052 cobalt Inorganic materials 0.000 claims abstract description 13
- 239000010941 cobalt Substances 0.000 claims abstract description 13
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052802 copper Inorganic materials 0.000 claims abstract description 13
- 239000010949 copper Substances 0.000 claims abstract description 13
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000010703 silicon Substances 0.000 claims abstract description 13
- 239000010936 titanium Substances 0.000 claims abstract description 13
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 13
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 13
- 239000003129 oil well Substances 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 14
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 12
- 239000005864 Sulphur Substances 0.000 claims description 12
- 239000004411 aluminium Substances 0.000 claims description 12
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 10
- FAWGZAFXDJGWBB-UHFFFAOYSA-N antimony(3+) Chemical compound [Sb+3] FAWGZAFXDJGWBB-UHFFFAOYSA-N 0.000 claims description 10
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 9
- 229910052725 zinc Inorganic materials 0.000 claims description 9
- 239000011701 zinc Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 8
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 abstract description 59
- 230000007797 corrosion Effects 0.000 abstract description 59
- 239000011651 chromium Substances 0.000 abstract description 18
- 238000012360 testing method Methods 0.000 abstract description 10
- 230000002349 favourable effect Effects 0.000 abstract description 4
- 239000003921 oil Substances 0.000 abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052804 chromium Inorganic materials 0.000 abstract description 3
- 229910052750 molybdenum Inorganic materials 0.000 abstract description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract 1
- 229910052787 antimony Inorganic materials 0.000 abstract 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 abstract 1
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 abstract 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 abstract 1
- 239000011733 molybdenum Substances 0.000 abstract 1
- 229910052758 niobium Inorganic materials 0.000 abstract 1
- 239000010955 niobium Substances 0.000 abstract 1
- 239000002994 raw material Substances 0.000 abstract 1
- 229910052717 sulfur Inorganic materials 0.000 abstract 1
- 239000011593 sulfur Substances 0.000 abstract 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 abstract 1
- 239000010937 tungsten Substances 0.000 abstract 1
- 229910052720 vanadium Inorganic materials 0.000 abstract 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 abstract 1
- 239000000463 material Substances 0.000 description 31
- 239000013078 crystal Substances 0.000 description 12
- 238000002360 preparation method Methods 0.000 description 7
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 5
- 150000002500 ions Chemical class 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000003723 Smelting Methods 0.000 description 4
- 239000000470 constituent Substances 0.000 description 4
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- 238000005275 alloying Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
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- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses steel, an oil pumping rod containing the same and application of the steel. The steel comprises the following raw materials of carbon, silicon, manganese, phosphorous, sulfur, chromium, nickel, molybdenum, copper, aluminum, titanium, vanadium, niobium, tungsten, cobalt, antimony and ferrum. The steel provided by the invention has favorable mechanical property and excellent corrosion resistance, test proves that the corrosion resistance of the steel is 140-150 times of that of 20CrMo, and the steel is particularly suitable for being used during working of a coastal oil well.
Description
Technical field
The present invention relates to steel field, in particular to a kind of steel, comprise the application of its sucker rod and steel.
Background technology
As everyone knows, it is mainly galvanic corrosion that ferrous materials is corroded by working medium, and Corrosion Types mainly contains: intergranular corrosion, spot corrosion, and stress corrosion.The corrosion accident of this three kinds shape, accounts for the more than 83% of all kinds of galvanic corrosion accidents according to statistics.This corrosion belongs to local corrosion, and the breakdown speed of material is very fast, is the most dangerous Corrosion Types.
It is to be noted especially: ferrous materials is in and is rich in Cl
-the corrosion occurring in the medium of ion is mainly intergranular corrosion.Intergranular corrosion is that ferrous materials is corroded along crystal boundary in medium, makes intergranule lose a kind of phenomenon of bonding force.Its corrosive medium condition is containing Cl
-, SO
4 2-, PO
3 3-the solution of ion or salt, temperature condition is below 200 ℃.Mechanism of corrosion is: because the solid solubility of C in steel sharply reduces with the reduction of temperature, and under general cooling conditions, 0.02% when 0.15% in the time of can be from 1000 ℃ drop to room temperature, extra C will be with Cr
23c
6carbide form along crystal boundary, separate out.Cr constituent content in this carbide reaches as high as more than 70%.Because the speed that C separates out to crystal boundary is very fast, thus the Cr element consuming can only capture from adjacent grain boundary region, thereby cause the poor Cr of crystal boundary height.In electrochemical reaction, preferentially react as sun level in the poor Cr of this class region, and grain boundary corrosion occurs.
Spot corrosion is to produce irregular pitting shape corrosion at metal material surface, also cries pitting.The corrosive medium condition that produces spot corrosion is Cl
-ion, Br
-, I
-, ClO
4 -in solution, there is heavy metal ion or contain K
+, Na
+, Ca
2+, Mg
2+deng alkaline-earth metal ions.The temperature occurring 50 ℃ at most following, 80～90 ℃ is the most dangerous temperature section.
Material is remaining certain tensile stress in the course of processing, is rich in K depositing
+, Na
+, Ca
2+, Mg
2+deng alkalimetal ion and Cl
-in solion, easily there is stress corrosion.Its temperature condition is room temperature to 300 ℃.Austenite metallographic structure is owing to having slippage and twin, therefore only at 30～50N/mm
2the remaining tensile stress condition of Disabled under will there is stress corrosion.
In prior art, conventionally adopt 20CrMo as oil production machine material of sucker rod.20CrMo is a kind of structural alloy steel of classics, owing to containing a certain amount of Cr and Mo in its component, thereby has good comprehensive mechanical performance, and its tensile strength is generally at 885Mpa/mm
2above, yield strength is generally at 685Mpa/mm
2above, unit elongation is greater than 12%, and relative reduction in area is greater than 50%, and ballistic work is greater than 78J.But due to its component compatibility, substantially do not possess corrosion resistance, thereby can only in the component of the common vehicle without requirement for anticorrosion, lathe, as general structural part, use, be unwell in coastal oil well and contain K
+, Na
+, Ca
2+, Mg
2+deng alkaline-earth metal ions and Cl
-, SO
4 2-in the severe environment of ionic liquid, use.
Summary of the invention
The present invention aims to provide a kind of steel, comprises the application of its sucker rod and steel, to solve in prior art the technical problem being easily corroded when common iron is worked in coastal oil well.
To achieve these goals, according to an aspect of the present invention, a kind of steel are provided.These steel contain following feed composition by weight percentage: 0.03%～0.05% carbon, 0.035%～0.05% element silicon, 5%～6% manganese element, 0.25%～0.35% phosphoric, 0.015%～0.017% element sulphur, 9.50%～10.5% chromium element, 0.25%～0.50% nickel element, 0.15%～0.20% molybdenum element, 0.50%～0.60% copper, 0.15%～0.17% aluminium element, 0.15%～0.16% titanium elements, 0.04%～0.05% v element, 0.01%～0.015% niobium element, 0.050%～0.060% W elements, 0.018%～0.020% cobalt element, 0～0.001% antimony element, and 81.201%～83.81% ferro element.
Further, also comprise 0.018%～0.020% zinc element.
Further, also comprise 0.004%～0.006% tin element.
Further, also comprise 0.02%～0.03% lead element.
Further, contain by weight percentage following feed composition: 0.031% carbon, 0.05% element silicon, 5.776% manganese element, 0.326% phosphoric, 0.017% element sulphur, 10.33% chromium element, 0.22% nickel element, 0.173% molybdenum element, 0.65% copper, 0.007% aluminium element, 0.158% titanium elements, 0.047% v element, 0.019% niobium element, 0.058% W elements, 0.0185% zinc element, 0.018% cobalt element, 0.004% tin element, 0.022% lead element, 0.001% antimony element, and the ferro element of surplus.
According to another aspect of the present invention, provide a kind of sucker rod.This sucker rod adopts above-mentioned steel to be made.
Further, in the making processes of sucker rod, also comprised the destressing at the rod member of sucker rod and two ends has been processed.
Further, destressing is processed and to be comprised: the core structure at the rod member of sucker rod and two ends and heat affected zone are formed to the processing of sorbite or troostite.
According to a further aspect of the invention, the application of these steel in coastal oil well operation.
The beneficial effect that the present invention produces is as follows: steel provided by the present invention not only have good mechanical property, and erosion resistance is very excellent, through evidence, its corrosion resistance nature is 140～150 times of 20CrMo, can be suitable for especially using in coastal oil well operation.
Embodiment
Be noted that following detailed description is all exemplary, is intended to the invention provides further instruction.Unless otherwise, all technology used herein and scientific terminology have the identical meanings of conventionally understanding with general technical staff of the technical field of the invention.
According to the present invention, a kind of typical embodiment, provides a kind of steel.These steel contain following feed composition by weight percentage: 0.03%～0.05% carbon, 0.035%～0.05% element silicon, 5%～6% manganese element, 0.25%～0.35% phosphoric, 0.015%～0.017% element sulphur, 9.50%～10.5% chromium element, 0.25%～0.50% nickel element, 0.15%～0.20% molybdenum element, 0.50%～0.60% copper, 0.15%～0.17% aluminium element, 0.15%～0.16% titanium elements, 0.04%～0.05% v element, 0.01%～0.015% niobium element, 0.050%～0.060% W elements, 0.018%～0.020% cobalt element, 0～0.001% antimony element, and 81.201%～83.81% ferro element.Steel provided by the present invention not only have good mechanical property, and erosion resistance is very excellent, and through evidence, its corrosion resistance nature is 140～150 times of 20CrMo, can be suitable for especially using in coastal oil well operation.
A kind of typical embodiment according to the present invention, steel can also comprise 0.018%～0.020% zinc element, 0.004%～0.006% tin element, and/or 0.02%～0.03% lead element.
Preferred embodiment a kind of according to the present invention, these steel contain following feed composition by weight percentage: 0.031% carbon, 0.05% element silicon, 5.776% manganese element, 0.326% phosphoric, 0.017% element sulphur, 10.33% chromium element, 0.22% nickel element, 0.173% molybdenum element, 0.65% copper, 0.007% aluminium element, 0.158% titanium elements, 0.047% v element, 0.019% niobium element, 0.058% W elements, 0.0185% zinc element, 0.018% cobalt element, 0.004% tin element, 0.022% lead element, 0.001% antimony element, and the ferro element of surplus.
The good corrosion energy of steel of the present invention, derives from its special Chemical Composition and forms and metallurgical structure.As everyone knows, it is mainly galvanic corrosion that ferrous materials is corroded by working medium, and Corrosion Types mainly contains: intergranular corrosion, spot corrosion, and stress corrosion.The corrosion accident of this three kinds shape, accounts for the more than 83% of all kinds of galvanic corrosion accidents according to statistics.This corrosion belongs to local corrosion, and the breakdown speed of material is very fast, is the most dangerous Corrosion Types.It is to be noted especially: ferrous materials is in and is rich in Cl
-the corrosion occurring in the medium of ion is mainly intergranular corrosion.The composition of steel of the present invention is mainly also set up defences for this corrodible property with tissue design.
C basic controlling in steel of the present invention, 0.03%～0.05%, only has a small amount of Cr under general speed of cooling
23c
6carbide generate, at crystal boundary, there will not be continuous carbide, thereby there is stronger anti-grain boundary corrosion ability.This is that it compares one of major reason having good anti-grain boundary corrosion ability with 20CrMo.
It is to be noted: Cr element can improve the solid solubility of C in steel, Cr content is high has positive interaction to strengthening anti-grain boundary corrosion ability.And Ni element can reduce the solid solubility of C in steel, thereby reduce anti-grain boundary corrosion ability.Especially be rich in Cl
-, SO
4 2-in the corrosive medium solution of ion, this acting in opposition is stronger.Conventionally in industry, all Ni constituent content threshold value is controlled to 0.8%～1.0%, and containing Ni element, far below this, is worth in steel of the present invention, only containing 0.25%～0.50%.Meanwhile, higher containing Al in steel of the present invention, crystal grain that can refinement steel, tiny grain structure can increase crystal boundary total length, thereby has relatively reduced Cr
23c
6the distribution density of carbide, this is also a kind of favorable factor.
Conventionally Cr, the Mo in material, the favourable element that Si, Ni are anti-spot corrosion, high rear low before its ability.Easily there is the material of poor Cr in crystal boundary, the crystal boundary of poor Cr also can preferentially become the sensitive area of spot corrosion.Because carbon ratio in steel provided by the invention is lower, Cr is higher, and therefore the ability of anti-spot corrosion is more intense.
Steel its preparation method provided by the present invention is identical with method of the prior art, and wherein, the smelting temperature of steel is 1580～1680 ℃, in the smelting process of steel, will strictly control the impact of oxide based inclusion on material property.The rolling temperature of steel is 1180～960 ℃, cooling in heap.Smelt to adopt just refining of electric arc furnace that molten steel is provided, with AOD or VOD stove, first steel-making water is carried out to oxygen decarburization desulfurization, further after alloying adjusting component and temperature, the refining such as degassed, water ingot.Embryo flaw detection left by milling train, and temperature control cool controlled rolling forming material arranges after thermal treatment and cuts scale and become a useful person.
According to the present invention, a kind of typical embodiment, provides a kind of sucker rod.This sucker rod adopts steel of the present invention to be made.Preferably, in the making processes of sucker rod, also comprised the destressing at the rod member of sucker rod and two ends has been processed.
Steel of the present invention are that martensite adds a small amount of ferrite under hot-rolled state, after treatment metallographic structure tempered sorbite.Sorbite is a kind of ultra-fine little perlite in essence, has excellent mechanical performances, and Disabled residue stress is little, and strength and toughness coupling better.Ultra-fine little crystal, the two is all favorable factor to opposing grain boundary corrosion, spot corrosion and stress corrosion for low Disabled residue stress.Because yield strength is high, there is the critical stress value of stress corrosion at 300N/mm in ferrite and martensitic stucture
2left and right, is therefore difficult for occurring stress corrosion relatively.
Steel of the present invention are not austenite structures, and the ability of its stress corrosion resistant approaches martensite.Material rod member and two auspicious heads in making processes, all pass through destressing and process simultaneously, and it is more thorough that residual tension is eliminated, thereby have suppressed the generation of stress corrosion in use.From the reasonable angle of metallographic structure, consider, steel of the present invention are in making the process of sucker rod, after rod member forging and molding, take suitable measure that two ends core structure and heat affected zone are restored to sorbite or troostite, be the process procedure that need to be paid much attention to.In addition, due to Cr atom in ferrite material and martensitic material velocity of diffusion than in austenite material fast tens times, under similarity condition, in steel microstructure of the present invention, the Cr constituent content of intracrystalline and crystal boundary easily reaches balance, can prevent grain boundary corrosion.And 20CrMo material is difficult to reach the balance of the Cr constituent content of intracrystalline and crystal boundary, cannot effectively prevent intergranular corrosion.
In sum, steel of the present invention are a kind of joint Ni, joint Mo type material, because the corrosion resistance nature of steel of the present invention is very excellent, so be adapted at the application in operation in coastal oil well.
Below in conjunction with embodiment, further illustrate beneficial effect of the present invention.
Embodiment 1
Material component: 0.031% carbon, 0.05% element silicon, 5.776% manganese element, 0.326% phosphoric, 0.017% element sulphur, 10.33% chromium element, 0.22% nickel element, 0.173% molybdenum element, 0.65% copper, 0.007% aluminium element, 0.158% titanium elements, 0.047% v element, 0.019% niobium element, 0.058% W elements, 0.0185% zinc element, 0.018% cobalt element, 0.004% tin element, 0.022% lead element, 0.001% antimony element and the ferro element of surplus.
Preparation method is same as the prior art, and the smelting temperature of steel is 1580～1680 ℃, in the smelting process of steel, will strictly control the impact of oxide based inclusion on material property.The rolling temperature of steel is 1180～960 ℃, cooling in heap.Smelt to adopt just refining of electric arc furnace that molten steel is provided, with AOD or VOD stove, first steel-making water is carried out to oxygen decarburization desulfurization, further after alloying adjusting component and temperature, the refining such as degassed, water ingot.Embryo flaw detection left by milling train, and temperature control cool controlled rolling forming material arranges after thermal treatment and cuts scale and become a useful person.
Embodiment 2
Material component: 0.03% carbon, 0.05% element silicon, 5% manganese element, 0.35% phosphoric, 0.017% element sulphur, 9.50% chromium element, 0.25% nickel element, 0.20% molybdenum element, 0.50% copper, 0.15% aluminium element, 0.16% titanium elements, 0.05% v element, 0.015% niobium element, 0.060% W elements, 0.018% cobalt element and the ferro element of surplus.
Preparation method is with embodiment 1.
Embodiment 3
Material component: 0.05% carbon, 0.05% element silicon, 6% manganese element, 0.25% phosphoric, 0.015% element sulphur, 10.5% chromium element, 0.50% nickel element, 0.15% molybdenum element, 0.60% copper, 0.17% aluminium element, 0.15% titanium elements, 0.04% v element, 0.01% niobium element, 0.050% W elements, 0.020% cobalt element, 0.001% antimony element and the ferro element of surplus.
Preparation method is with embodiment 1.
Embodiment 4
Material component: 0.04% carbon, 0.038% element silicon, 5.66% manganese element, 0.31% phosphoric, 0.015% element sulphur, 9.59% chromium element, 0.46% nickel element, 0.19% molybdenum element, 0.57% copper, 0.17% aluminium element, 0.156% titanium elements, 0.041% v element, 0.011% niobium element, 0.051% W elements, 0.020% cobalt element, 0.001% antimony element, 0.019% zinc element, the ferro element of 0.005% tin element, 0.021% lead element and surplus.
Preparation method is with embodiment 1.
Embodiment 5
Material component: 0.037% carbon, 0.039% element silicon, 5.9% manganese element, 0.31% phosphoric, 0.016% element sulphur, 9.55% chromium element, 0.43% nickel element, 0.17% molybdenum element, 0.53% copper, 0.157% aluminium element, 0.156% titanium elements, 0.045% v element, 0.01% niobium element, 0.056% W elements, 0.018% cobalt element, 0.004% tin element, 0.02% lead element and the ferro element of surplus.
Preparation method is with embodiment 1.
Embodiment 6
Material component: 0.05% carbon, 0.05% element silicon, 6% manganese element, 0.33% phosphoric, 0.015% element sulphur, 10.1% chromium element, 0.27% nickel element, 0.20% molybdenum element, 0.60% copper, 0.17% aluminium element, 0.15% titanium elements, 0.05% v element, 0.015% niobium element, 0.060% W elements, 0.020% cobalt element, 0.001% antimony element, 0.020% zinc element, 0.004% tin element and the ferro element of surplus.
Preparation method is with embodiment 1.
To test according to the prepared steel of embodiment 1 ~ 6, and further steel provided by the present invention are analyzed according to test result.
One, tensile property test
According to SY/T5029-2006 < < sucker rod > > petroleum industry standard and GB/T229-2002 < < metallic substance tensile test at room temperature method > > national standard, the steel sample of embodiment 1 ~ 6 and comparative example has been carried out to tensile strength, yield strength, elongation, relative reduction in area and carried out standard testing.(in Table 1)
Table 1.
Known by data in table 1, according to the mechanical property of the prepared steel of the embodiment of the present invention 1 ~ 6, can meet in SY/T5029-2006 < < sucker rod > > petroleum industry standard and GB/T229-2002 < < metallic substance tensile test at room temperature method > > national standard the requirement about steel mechanical property.The good mechanical property of the mechanical property ratio comparative example 20CrMo steel of the steel that the embodiment of the present invention 1 ~ 6 is prepared or close.
Two, fatigue test
According to China Petroleum Univ. (East-China) Electrical and Mechanical Engineering College, adopt PLG-300KN HF fatigue testing machine according to sucker rod experimental technique fatigue lifetime of SY/T5029-2006 < < sucker rod > > petroleum industry standard code, the sucker rod life-span is tested.Experimental result is in Table 2.
Table 2
Test-results shows: steel of the present invention all reach standard gauge definite value fatigue lifetime.
Three, autoclave corrosion test
Adopt high-temperature high-pressure reaction kettle to carry out high-temperature high-pressure anti-corrosive performance test to the steel of conventional material of sucker rod 20CrMoA, (Baosteel) 10Cr2MoNi, (Baosteel) 10Cr3MoNi and the embodiment of the present invention 1 ~ 6.
(1) test(ing) medium
According to pungent 106 * 119 water sample salinity (in Table the 3) configurations in Dong Xin oil recovery factory, total mineralization reaches 137739mg/L.
Table 3
(2) experiment condition
Temperature, the time of 1. testing.
Temperature: 60 ℃, 80 ℃, 110 ℃.
Time: 240h.
2. the size of sample, quantity.
Size: endoporus: Φ 10.5mm, external diameter: Φ 16mm; Height h=20mm;
Quantity: 3 samples of every kind of material, the present invention gets embodiment 1 ~ 6, results averaged.
3. test pressure 20MPa, CO
2(carbonic acid gas) dividing potential drop 2.0MPa;
4. flow velocity: 1.0m/s (simulation downhole fluid velocity of flow)
(3) evaluation method
Adopt weight-loss method and surface corrosion phenomenon analysis method, from uniform corrosion and local corrosion two aspect contrast antiseptic properties.
60 ℃ of high-temperature high-pressure anti-corrosive performance test results are in Table 4; 80 ℃ of high-temperature high-pressure anti-corrosive performance test results are in Table 5; 110 ℃ of high-temperature high-pressure anti-corrosive performance test results are in Table 6.
Table 4
Table 5
Table 6
According to 60 ℃, 80 ℃, 110 ℃, high-temperature high-pressure anti-corrosive performance comparison test, draws the following conclusions: steel of the present invention have on average improved more than 200 times than conventional oil pumping material 20CrMoA; Than Baosteel tubing material 10Cr3MoNi, on average improved more than 150 times.
To sum up, steel provided by the present invention not only have good mechanical property, and erosion resistance is very excellent, can be suitable for especially using in coastal oil well operation.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (9)
1. steel, it is characterized in that, contain by weight percentage following feed composition: 0.03%～0.05% carbon, 0.035%～0.05% element silicon, 5%～6% manganese element, 0.25%～0.35% phosphoric, 0.015%～0.017% element sulphur, 9.50%～10.5% chromium element, 0.25%～0.50% nickel element, 0.15%～0.20% molybdenum element, 0.50%～0.60% copper, 0.15%～0.17% aluminium element, 0.15%～0.16% titanium elements, 0.04%～0.05% v element, 0.01%～0.015% niobium element, 0.050%～0.060% W elements, 0.018%～0.020% cobalt element, 0～0.001% antimony element, and 81.201%～83.81% ferro element.
2. steel according to claim 1, is characterized in that, also comprise 0.018%～0.020% zinc element.
3. steel according to claim 1, is characterized in that, also comprise 0.004%～0.006% tin element.
4. steel according to claim 1, is characterized in that, also comprise 0.02%～0.03% lead element.
5. steel, it is characterized in that, contain by weight percentage following feed composition: 0.031% carbon, 0.05% element silicon, 5.776% manganese element, 0.326% phosphoric, 0.017% element sulphur, 10.33% chromium element, 0.22% nickel element, 0.173% molybdenum element, 0.65% copper, 0.007% aluminium element, 0.158% titanium elements, 0.047% v element, 0.019% niobium element, 0.058% W elements, 0.0185% zinc element, 0.018% cobalt element, 0.004% tin element, 0.022% lead element, 0.001% antimony element, and the ferro element of surplus.
6. a sucker rod, is characterized in that, adopts the steel as described in claim 1 to 5 any one to be made.
7. sucker rod according to claim 6, is characterized in that, has also comprised the destressing at the rod member of described sucker rod and two ends is processed in the making processes of described sucker rod.
8. sucker rod according to claim 7, is characterized in that, described destressing is processed and comprised: the core structure at the rod member of described sucker rod and two ends and heat affected zone are formed to the processing of sorbite or troostite.
9. steel as described in claim 1 to the 5 any one application in coastal oil well operation.
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