CN105441816A - Steel for sucker rod and manufacturing method of sucker rod - Google Patents
Steel for sucker rod and manufacturing method of sucker rod Download PDFInfo
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- CN105441816A CN105441816A CN201410433322.5A CN201410433322A CN105441816A CN 105441816 A CN105441816 A CN 105441816A CN 201410433322 A CN201410433322 A CN 201410433322A CN 105441816 A CN105441816 A CN 105441816A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 109
- 239000010959 steel Substances 0.000 title claims abstract description 109
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 44
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 36
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 30
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 29
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 29
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 26
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000010791 quenching Methods 0.000 claims abstract description 24
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229910052802 copper Inorganic materials 0.000 claims abstract description 23
- 239000010949 copper Substances 0.000 claims abstract description 23
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 21
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 21
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910052742 iron Inorganic materials 0.000 claims abstract description 20
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 20
- 239000011574 phosphorus Substances 0.000 claims abstract description 20
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 19
- 239000011651 chromium Substances 0.000 claims abstract description 19
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 19
- 239000011733 molybdenum Substances 0.000 claims abstract description 19
- 230000000171 quenching effect Effects 0.000 claims abstract description 19
- 239000010703 silicon Substances 0.000 claims abstract description 19
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 19
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 18
- 238000005496 tempering Methods 0.000 claims abstract description 14
- 239000007864 aqueous solution Substances 0.000 claims abstract description 13
- 239000011780 sodium chloride Substances 0.000 claims abstract description 13
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000005422 blasting Methods 0.000 claims abstract description 9
- 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 claims abstract description 8
- 239000000126 substance Substances 0.000 claims abstract description 8
- 238000003754 machining Methods 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 32
- 239000004411 aluminium Substances 0.000 claims description 28
- 238000007670 refining Methods 0.000 claims description 27
- 239000005864 Sulphur Substances 0.000 claims description 21
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 13
- 238000001514 detection method Methods 0.000 claims description 13
- 229910052748 manganese Inorganic materials 0.000 claims description 11
- 239000011572 manganese Substances 0.000 claims description 11
- 238000005242 forging Methods 0.000 claims description 9
- 238000007493 shaping process Methods 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 5
- 238000004513 sizing Methods 0.000 claims description 5
- 238000005260 corrosion Methods 0.000 abstract description 29
- 230000007797 corrosion Effects 0.000 abstract description 29
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 abstract description 12
- 229910000037 hydrogen sulfide Inorganic materials 0.000 abstract description 12
- 239000003921 oil Substances 0.000 abstract description 12
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 abstract description 7
- 229910052717 sulfur Inorganic materials 0.000 abstract description 3
- 239000011593 sulfur Substances 0.000 abstract description 3
- 238000001816 cooling Methods 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 230000003628 erosive effect Effects 0.000 description 8
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000000243 solution Substances 0.000 description 5
- 241000370738 Chlorion Species 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 3
- 208000037656 Respiratory Sounds Diseases 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005496 eutectics Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
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- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses steel for a sucker rod and a manufacturing method of the sucker rod, and belongs to the field of oil exploitation instruments. The chemical components of the steel for the sucker rod are as follows: carbon, silicon, manganese, chromium, molybdenum, aluminum, copper, phosphorus, sulfur, nickel, and iron. The manufacturing method comprises the following steps: the sucker rod is machined and formed by steel and forged, then quenching and tempering are carried out, then hot straightening is carried out to obtain a blank of the sucker rod, and shot blasting treatment and thread machining are carried out on the surface of the blank of the sucker rod to manufacture the sucker rod. The steel for the sucker rod has the advantages that a proper amount of elements are added into iron, so that the corrosion resistance and strength of the sucker rod are improved, particularly the corrosion resistance of hydrogen sulfide and chloride ions is improved, the service life of the sucker rod is prolonged, and the cost of oil exploitation is reduced. The manufacturing method adopts the sodium chloride aqueous solution as a medium for cooling, so that the prepared sucker rod is uniformly quenched, and quenching cracks of the sucker rod are reduced.
Description
Technical field
The present invention relates to oil production instrument field, particularly the manufacture method of a kind of steel for sucker rod and sucker rod.
Background technology
Sucker rod is the slender rod piece of rod-pumped well, and sucker rod is threaded connection by multiple single sucker rod and forms, and this sucker rod connects polished rod, under connect oil pumping and pump up and transmit the effect of power, be one of expendable material important in oil extraction activity.
In oil production process, generally hydrogen sulfide is there is in well liquid, and arrived latter period of oilfield development, need in stratum, inject hydrochloric acid acid solution and carry out fracture acidizing to improve oil offtake, this can cause chloride ion content in crude oil very high, and sucker rod is operated in high temperature, Wet H2S environment and chloride ion corrosion environment, and sucker rod bears unsymmetrical cycle under operating mode, sucker rod is made to become expendable material, lost efficacy in order to the maximum prolongation sucker rod life-span reduces, and adopted at sucker rod surface spraying protective system or select corrosion resistant material to manufacture sucker rod.
Realizing in process of the present invention, contriver finds that prior art at least exists following problem:
In order to extend the life-span of sucker rod, sucker rod is made not only to need to have stronger corrosion resistance, also need that there is standby higher intensity, the material of existing sucker rod can not make sucker rod possess the performance of corrosion resistance and high strength simultaneously, make the life-span of existing sucker rod shorter, thus add the cost of oil production.
Summary of the invention
In order to the material solving sucker rod in prior art can not make sucker rod possess the problem of the performance of corrosion resistance and high strength simultaneously, embodiments provide the manufacture method of a kind of steel for sucker rod and sucker rod.Described technical scheme is as follows:
On the one hand, embodiments provide a kind of steel for sucker rod, described steel for sucker rod comprises: carbon, silicon, manganese, chromium, molybdenum, aluminium, copper, phosphorus, sulphur, nickel and iron, the weight percent of carbon is 0.28% ~ 0.33%, the weight percent of silicon is 0.20% ~ 0.40%, the weight percent of manganese is 1.10% ~ 1.50%, the weight percent of chromium is 2.0% ~ 2.5%, the weight percent of molybdenum is 0.15% ~ 0.25%, the weight percent of aluminium is 0.30% ~ 0.70%, the weight percent of copper is 1.0% ~ 1.5%, weight percent≤0.020% of phosphorus, weight percent≤0.020% of sulphur, weight percent≤0.030% of nickel, surplus is iron.
Particularly, the weight percent of carbon is 0.33%, and the weight percent of silicon is 0.40%, and the weight percent of manganese is 1.50%, the weight percent of chromium is 2.5%, the weight percent of molybdenum is 0.25%, and the weight percent of aluminium is 0.70%, and the weight percent of copper is 1.5%, the weight percent of phosphorus is 0.020%, the weight percent of sulphur is 0.020%, and the weight percent of nickel is 0.030%, and surplus is iron.
On the other hand, embodiments provide a kind of manufacture method of sucker rod, described method comprises: steel for sucker rod machine-shaping forged, carry out quench treatment again, the temperature of described quenching is 940 ± 20 DEG C, be incubated 40 ~ 60 minutes, the medium of described quenching to be concentration be 6 ~ 10% sodium chloride aqueous solution, carry out temper again, the temperature of described tempering is 640 ± 20 DEG C, be incubated 60 minutes, hot alignment is carried out at temperature 300 DEG C, obtain the blank of sucker rod, Shot Blasting is carried out and machining screw to the surface of the blank of described sucker rod, make described sucker rod.
The chemical composition of described steel for sucker rod is: carbon, silicon, manganese, chromium, molybdenum, aluminium, copper, phosphorus, sulphur, nickel and iron, the weight percent of carbon is 0.28% ~ 0.33%, the weight percent of silicon is 0.20% ~ 0.40%, the weight percent of manganese is 1.10% ~ 1.50%, the weight percent of chromium is 2.0% ~ 2.5%, the weight percent of molybdenum is 0.15% ~ 0.25%, the weight percent of aluminium is 0.30% ~ 0.70%, the weight percent of copper is 1.0% ~ 1.5%, weight percent≤0.020% of phosphorus, weight percent≤0.020% of sulphur, weight percent≤0.030% of nickel, surplus is iron.
Particularly, the described method by sucker rod machine-shaping comprises: described steel for sucker rod is put into electric furnace and carry out just refining, refining is carried out in refining furnace, carry out drawing steel to obtain throwing in continuous caster, flaw detection is carried out to described throwing, carry out cutting sizing operation after flaw detection is qualified and make shaping described sucker rod steel billet, described sucker rod steel billet is rolled into round steel.
Particularly, it is at 1050 DEG C that the method for described forging is included in temperature, and by the two ends jumping-up of described round steel, and the heat-eliminating medium after forging is air.
Further, the concentration of described sodium chloride aqueous solution is 8%.
Particularly, the medium of described tempering is air.
Particularly, the chemical composition of described steel for sucker rod is: the weight percent of carbon is 0.33%, and the weight percent of silicon is 0.40%, and the weight percent of manganese is 1.50%, the weight percent of chromium is 2.5%, the weight percent of molybdenum is 0.25%, and the weight percent of aluminium is 0.70%, and the weight percent of copper is 1.5%, the weight percent of phosphorus is 0.020%, the weight percent of sulphur is 0.020%, and the weight percent of nickel is 0.030%, and surplus is iron.
Particularly, the temperature of described just refining is 1540 DEG C.
Particularly, the temperature of described refining is 1580 DEG C.
The beneficial effect that the technical scheme that the embodiment of the present invention provides is brought is: add in steel for sucker rod provided by the invention appropriate copper can improve steel for sucker rod to the erosion resistance of the chlorion in sulfuric acid and hydrochloric acid and counter stress corrosion stability; If aluminium element adds and too highly easily causes the heat-treating unstable of steel for sucker rod and affect the resisting corrosion of chlorine ion performance of steel, the present invention adds appropriate aluminium element, the high-temperature oxidation resistance of steel for sucker rod can be significantly improved, particularly can resist the corrosive nature of hydrogen sulfide, significantly improve the coefficient of performance of steel for sucker rod under hydrogen sulfide corrosion environment, i.e. permissible stress, can avoid the aluminium element of high-content in steel easily to occur heat-treating unstable and the resisting corrosion of chlorine ion behavior pattern affecting steel by adding appropriate aluminium element; The chromium element adding high-content can improve the hardening capacity of steel, makes the homogeneous microstructure of steel, grain refining in preparation process, also significantly can improve the corrosion resistance of steel simultaneously; The too high compound (FeS-Fe eutectic) easily making steel produce sulphur when hot-work of sulfur content, reduce the toughness of steel, in the forging process of sucker rod, cause crackle, also can reduce the corrosion resistance of steel, phosphorus element content is too high easily easily produces segregation in steel, forms Fe
3p, reduces the toughness of steel and plasticity, the fatigue strength of steel is reduced, and the present invention adds the element sulphur of low levels and phosphoric makes the toughness of steel for sucker rod, corrosion resistance, plasticity and fatigue strength be improved; The carbon that the present invention adds low levels can significantly improve the intensity of steel; The manganese element that the present invention adds high-content can significantly improve the intensity of steel, and do not reduce the toughness of steel, simultaneously, the copper added in steel for sucker rod provided by the invention can with the coordinating of aluminium element, the resistance to corrosion of sucker rod and intensity are all improved, especially resist the corrosive power of hydrogen sulfide and chlorion, the present invention is by adding appropriate element, extend the life-span of sucker rod, reduce the cost of oil production.Manufacture method provided by the invention, adopts sodium chloride aqueous solution to cool as medium, makes the sucker rod uniform quenching prepared, reduce the quenching crack of sucker rod.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below embodiment of the present invention is described further in detail.
Embodiment one
Embodiments provide the manufacture method of a kind of steel for sucker rod and sucker rod, the chemical composition of this steel for sucker rod is: carbon, silicon, manganese, chromium, molybdenum, aluminium, copper, phosphorus, sulphur, nickel and iron, the weight percent of carbon is 0.30%, the weight percent of silicon is 0.25%, the weight percent of manganese is 1.20%, the weight percent of chromium is 2.1%, the weight percent of molybdenum is 0.20%, the weight percent of aluminium is 0.40%, the weight percent of copper is 1.1%, the weight percent of phosphorus is 0.019%, the weight percent of sulphur is 0.015%, the weight percent of nickel is 0.020%, surplus is iron.
This manufacture method comprises to be put into electric furnace and carries out just refining by steel for sucker rod, first refining temperature is 1540 DEG C, refining is carried out in refining furnace, refining temperature is 1580 DEG C, carry out drawing steel to obtain throwing in continuous caster, flaw detection is carried out to throwing, carry out cutting sizing operation after flaw detection is qualified and make shaping sucker rod steel billet, sucker rod steel billet is rolled into round steel (steel billet is rolled into round steel with continuous merchant bar mill under adopting normal pressure by rolling at 1180 DEG C), round steel is forged at 1050 DEG C, by the two ends jumping-up of round steel, and the heat-eliminating medium after forging is air, carry out quench treatment (quenching adopts standard equipment JL81-07 electric furnace) again, the temperature of quenching is 940 ± 20 DEG C, be incubated 40 ~ 60 minutes, the medium of this quenching to be concentration be 8% sodium chloride aqueous solution (salt solution), carry out temper (tempering adopts standard equipment JL81-07 electric furnace) again, the temperature of tempering is 640 ± 20 DEG C, be incubated 60 minutes, the medium of this tempering is air, hot alignment (hot alignment adopts existing straightener) is carried out at temperature 300 DEG C, obtain the blank of sucker rod, Shot Blasting is carried out and machining screw to the blank surface of sucker rod, obtain the first sucker rod, wherein, ball blast adopts standard equipment C393 passing shot blasting machine, screw thread process adopts standard equipment C3163 lathe.
First sucker rod is carried out the detection of corrosion resistance and intensity, detected result is: the corrosion resistance index of the first sucker rod is: be in the hydrogen sulfide solution of 350ppm in concentration, erosion rate≤0.3mm/a is in the sodium chloride aqueous solution of 3% in concentration, erosion rate≤0.1mm/a; The mechanical performance index of the first sucker rod is: tensile strength >=975Mpa, yield strength >=815MPa, elongation at break >=14%, relative reduction in area >=50%, normal temperature ballistic work >=67J.
Embodiment two
Embodiments provide the manufacture method of a kind of steel for sucker rod and sucker rod, the chemical composition of this steel for sucker rod is: carbon, silicon, manganese, chromium, molybdenum, aluminium, copper, phosphorus, sulphur, nickel and iron, the weight percent of carbon is 0.28%, the weight percent of silicon is 0.20%, and the weight percent of manganese is 1.10%, and the weight percent of chromium is 2.0%, the weight percent of molybdenum is 0.15%, the weight percent of aluminium is 0.30%, and the weight percent of copper is 1.0%, and surplus is iron.
This manufacture method comprises to be put into electric furnace and carries out just refining by steel for sucker rod, first refining temperature is 1540 DEG C, refining is carried out in refining furnace, refining temperature is 1580 DEG C, carry out drawing steel to obtain throwing in continuous caster, flaw detection is carried out to throwing, carry out cutting sizing operation after flaw detection is qualified and make shaping sucker rod steel billet, sucker rod steel billet is rolled into round steel (steel billet is rolled into round steel with continuous merchant bar mill under adopting normal pressure by rolling at 1180 DEG C), round steel is forged at 1050 DEG C, by the two ends jumping-up of round steel, and the heat-eliminating medium after forging is air, carry out quench treatment (quenching adopts standard equipment JL81-07 electric furnace) again, the temperature of quenching is 940 ± 20 DEG C, be incubated 40 ~ 60 minutes, the medium of this quenching to be concentration be 6% sodium chloride aqueous solution, carry out temper (tempering adopts standard equipment JL81-07 electric furnace) again, the temperature of tempering is 640 ± 20 DEG C, be incubated 60 minutes, the medium of this tempering is air, hot alignment (hot alignment adopts existing straightener) is carried out at temperature 300 DEG C, obtain the blank of sucker rod, Shot Blasting is carried out and machining screw to the blank surface of sucker rod, obtain the second sucker rod, wherein, ball blast adopts standard equipment C393 passing shot blasting machine, screw thread process adopts standard equipment C3163 lathe.
Second sucker rod is carried out the detection of corrosion resistance and intensity, detected result is: the second sucker rod corrosion resistance index is: be in the hydrogen sulfide solution of 350ppm in concentration, erosion rate≤0.3mm/a is in the sodium chloride aqueous solution of 3% in concentration, erosion rate≤0.1mm/a; The mechanical performance index of the second sucker rod is: tensile strength >=975Mpa, yield strength >=815MPa, elongation at break >=14%, relative reduction in area >=50%, normal temperature ballistic work >=67J.
Embodiment three
Embodiments provide the manufacture method of a kind of steel for sucker rod and sucker rod, the chemical composition of this steel for sucker rod is: carbon, silicon, manganese, chromium, molybdenum, aluminium, copper, phosphorus, sulphur, nickel and iron, the weight percent of carbon is 0.33%, the weight percent of silicon is 0.40%, the weight percent of manganese is 1.50%, the weight percent of chromium is 2.5%, the weight percent of molybdenum is 0.25%, the weight percent of aluminium is 0.70%, the weight percent of copper is 1.5%, the weight percent of phosphorus is 0.020%, the weight percent of sulphur is 0.020%, the weight percent of nickel is 0.030%, surplus is iron.
This manufacture method comprises to be put into electric furnace and carries out just refining by steel for sucker rod, first refining temperature is 1540 DEG C, refining is carried out in refining furnace, refining temperature is 1580 DEG C, carry out drawing steel to obtain throwing in continuous caster, flaw detection is carried out to throwing, carry out cutting sizing operation after flaw detection is qualified and make shaping sucker rod steel billet, sucker rod steel billet is rolled into round steel (steel billet is rolled into round steel with continuous merchant bar mill under adopting normal pressure by rolling at 1180 DEG C), round steel is forged at 1050 DEG C, by the two ends jumping-up of round steel, and the heat-eliminating medium after forging is air, carry out quench treatment (quenching adopts standard equipment JL81-07 electric furnace) again, the temperature of quenching is 940 ± 20 DEG C, be incubated 40 ~ 60 minutes, the medium of this quenching to be concentration be 10% sodium chloride aqueous solution, carry out temper (tempering adopts standard equipment JL81-07 electric furnace) again, the temperature of tempering is 640 ± 20 DEG C, be incubated 60 minutes, the medium of this tempering is air, hot alignment (hot alignment adopts existing straightener) is carried out at temperature 300 DEG C, obtain the blank of sucker rod, Shot Blasting is carried out and machining screw to the blank surface of sucker rod, obtain the 3rd sucker rod, wherein, ball blast adopts standard equipment C393 passing shot blasting machine, screw thread process adopts standard equipment C3163 lathe.
3rd sucker rod is carried out the detection of corrosion resistance and intensity, detected result is: the corrosion resistance index of the 3rd sucker rod is: be in the hydrogen sulfide solution of 350ppm in concentration, erosion rate≤0.2mm/a is in the sodium chloride aqueous solution of 3% in concentration, erosion rate≤0.05mm/a; The mechanical performance index of the 3rd sucker rod is: tensile strength >=975Mpa, yield strength >=815MPa, elongation at break >=14%, relative reduction in area >=50%, normal temperature ballistic work >=67J.
Add in steel for sucker rod provided by the invention appropriate copper can improve steel for sucker rod to the erosion resistance of the chlorion in sulfuric acid and hydrochloric acid and counter stress corrosion stability, if aluminium element adds and too highly easily causes the heat-treating unstable of steel for sucker rod and affect the resisting corrosion of chlorine ion performance of steel, the present invention adds appropriate aluminium element, the high-temperature oxidation resistance of steel for sucker rod can be significantly improved, particularly can resist the corrosive nature of hydrogen sulfide, significantly improve the coefficient of performance of steel for sucker rod under hydrogen sulfide corrosion environment, i.e. permissible stress, can avoid the aluminium element of high-content in steel easily to occur heat-treating unstable and the resisting corrosion of chlorine ion behavior pattern affecting steel by adding appropriate aluminium element, the chromium element adding high-content can improve the hardening capacity of steel, makes the homogeneous microstructure of steel, grain refining in preparation process, also significantly can improve the corrosion resistance of steel simultaneously, the too high compound (FeS-Fe eutectic) easily making steel produce sulphur when hot-work of sulfur content, reduce the toughness of steel, in the forging process of sucker rod, cause crackle, also can reduce the corrosion resistance of steel, phosphorus element content is too high easily easily produces segregation in steel, forms Fe
3p, reduces the toughness of steel and plasticity, the fatigue strength of steel is reduced, and the present invention adds the element sulphur of low levels and phosphoric makes the toughness of steel for sucker rod, corrosion resistance, plasticity and fatigue strength be improved, the carbon that the present invention adds low levels can significantly improve the intensity of steel, the manganese element that the present invention adds high-content can significantly improve the intensity of steel, and do not reduce the toughness of steel, simultaneously, the copper added in steel for sucker rod provided by the invention can with the coordinating of aluminium element, the resistance to corrosion of sucker rod and intensity are all improved, especially the corrosive power of hydrogen sulfide and chlorion is resisted, the present invention is by adding appropriate element, extend the life-span of sucker rod, reduce the cost of oil production, simultaneously, the sucker rod roofbolt that diameter specifications is less can be adopted, thus reduce the polished rod load of oil pumper, and then the energy consumption of oil well pump reduces, in addition, the cheap cost that reduce further oil production of the prices of raw and semifnished materials of steel for sucker rod provided by the invention.Manufacture method provided by the invention, adopts sodium chloride aqueous solution to cool as medium, makes the sucker rod uniform quenching prepared, reduce the quenching crack of sucker rod, improve surface hardness and the smooth finish of sucker rod simultaneously.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a steel for sucker rod, it is characterized in that, described steel for sucker rod comprises: carbon, silicon, manganese, chromium, molybdenum, aluminium, copper, phosphorus, sulphur, nickel and iron, the weight percent of carbon is 0.28% ~ 0.33%, the weight percent of silicon is 0.20% ~ 0.40%, the weight percent of manganese is 1.10% ~ 1.50%, the weight percent of chromium is 2.0% ~ 2.5%, the weight percent of molybdenum is 0.15% ~ 0.25%, the weight percent of aluminium is 0.30% ~ 0.70%, the weight percent of copper is 1.0% ~ 1.5%, weight percent≤0.020% of phosphorus, weight percent≤0.020% of sulphur, weight percent≤0.030% of nickel, surplus is iron.
2. steel for sucker rod according to claim 1, is characterized in that, the weight percent of carbon is 0.33%, the weight percent of silicon is 0.40%, the weight percent of manganese is 1.50%, and the weight percent of chromium is 2.5%, and the weight percent of molybdenum is 0.25%, the weight percent of aluminium is 0.70%, the weight percent of copper is 1.5%, and the weight percent of phosphorus is 0.020%, and the weight percent of sulphur is 0.020%, the weight percent of nickel is 0.030%, and surplus is iron.
3. the manufacture method of a sucker rod, it is characterized in that, described method comprises: steel for sucker rod machine-shaping forged, carry out quench treatment again, the temperature of described quenching is 940 ± 20 DEG C, be incubated 40 ~ 60 minutes, the medium of described quenching to be concentration be 6 ~ 10% sodium chloride aqueous solution, carry out temper again, the temperature of described tempering is 640 ± 20 DEG C, is incubated 60 minutes, hot alignment is carried out at temperature 300 DEG C, obtain the blank of sucker rod, Shot Blasting is carried out and machining screw to the blank surface of described sucker rod, makes described sucker rod;
The chemical composition of described steel for sucker rod is: carbon, silicon, manganese, chromium, molybdenum, aluminium, copper, phosphorus, sulphur, nickel and iron, the weight percent of carbon is 0.28% ~ 0.33%, the weight percent of silicon is 0.20% ~ 0.40%, the weight percent of manganese is 1.10% ~ 1.50%, the weight percent of chromium is 2.0% ~ 2.5%, the weight percent of molybdenum is 0.15% ~ 0.25%, the weight percent of aluminium is 0.30% ~ 0.70%, the weight percent of copper is 1.0% ~ 1.5%, weight percent≤0.020% of phosphorus, weight percent≤0.020% of sulphur, weight percent≤0.030% of nickel, surplus is iron.
4. method according to claim 3, it is characterized in that, the described method by sucker rod machine-shaping comprises: described steel for sucker rod is put into electric furnace and carry out just refining, refining is carried out in refining furnace, carry out drawing steel to obtain throwing in continuous caster, flaw detection is carried out to described throwing, carries out cutting sizing operation after flaw detection is qualified and make sucker rod steel billet, described sucker rod steel billet is rolled into round steel.
5. method according to claim 4, is characterized in that, it is at 1050 DEG C that the method for described forging is included in temperature, and by the two ends jumping-up of described round steel, and the heat-eliminating medium after forging is air.
6. method according to claim 3, is characterized in that, the concentration of described sodium chloride aqueous solution is 8%.
7. method according to claim 3, is characterized in that, the medium of described tempering is air.
8. method according to claim 3, it is characterized in that, the chemical composition of described steel for sucker rod is: the weight percent of carbon is 0.33%, the weight percent of silicon is 0.40%, the weight percent of manganese is 1.50%, the weight percent of chromium is 2.5%, the weight percent of molybdenum is 0.25%, the weight percent of aluminium is 0.70%, the weight percent of copper is 1.5%, and the weight percent of phosphorus is 0.020%, and the weight percent of sulphur is 0.020%, the weight percent of nickel is 0.030%, and surplus is iron.
9. method according to claim 4, is characterized in that, the temperature of described just refining is 1540 DEG C.
10. method according to claim 4, is characterized in that, the temperature of described refining is 1580 DEG C.
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| CN107701119A (en) * | 2017-09-22 | 2018-02-16 | 吉敏 | A kind of high-strength pumping rod and its processing method |
| CN109487175A (en) * | 2018-11-22 | 2019-03-19 | 浙江睿智钢业有限公司 | A kind of high-strength corrosion-resisting sucker rod and its preparation process |
| CN112030060A (en) * | 2020-09-10 | 2020-12-04 | 天津市顺泽采油设备有限公司 | Machining method of sucker rod |
| CN112375996A (en) * | 2020-11-16 | 2021-02-19 | 江苏联峰能源装备有限公司 | Steel for petroleum drill pipe joint and preparation method thereof |
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| CN109487175B (en) * | 2018-11-22 | 2020-01-10 | 浙江睿智钢业有限公司 | High-strength corrosion-resistant sucker rod and preparation process thereof |
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| CN112030060A (en) * | 2020-09-10 | 2020-12-04 | 天津市顺泽采油设备有限公司 | Machining method of sucker rod |
| CN112375996A (en) * | 2020-11-16 | 2021-02-19 | 江苏联峰能源装备有限公司 | Steel for petroleum drill pipe joint and preparation method thereof |
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