CN110616366A - 125ksi steel grade sulfur-resistant oil well pipe and manufacturing method thereof - Google Patents
125ksi steel grade sulfur-resistant oil well pipe and manufacturing method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
- C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
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- 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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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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- 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
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
Abstract
The invention discloses a 125ksi steel-grade sulfur-resistant oil well pipe, which comprises the following chemical elements in percentage by mass: c: 0.20 to 0.30%, Si: 0.1 to 0.5%, Mn: 0.2-0.6%, Cr: 0.30-0.70%, Mo: 0.60-1.00%, V: 0.10 to 0.20%, Nb: 0.01 to 0.06 percent,ti: 0.015-0.035%, W: 0.20-0.60%, less than or equal to 0.1% of Al, less than or equal to 0.008% of N, and the balance of Fe and other inevitable impurities. The invention also discloses a manufacturing method of the 125ksi steel-grade sulfur-resistant oil well pipe, which comprises the following steps: (1) preparing a tube blank; (2) perforating and hot rolling the tube blank to obtain a pierced billet; (3) cooling on-line control; (4) quenching and tempering: the quenching temperature in the quenching step is Ac3+ (30-50 ℃), wherein Ac3 (DEG C) is 910-203[ C%]1/2+44.7[Si％]+104[V％]+31.5[Mo％]+13.1[W％]Then water quenching is carried out, wherein the water quenching speed is more than or equal to 30 ℃/s; in the tempering step, the tempering temperature is 680-700 ℃, and then air cooling is carried out.
Description
Technical Field
The invention relates to an oil well pipe and a manufacturing method thereof, in particular to a sulfur-resistant oil well pipe and a manufacturing method thereof.
Background
With the increasing exhaustion of petroleum and natural gas, the development of oil and gas is developed towards the direction of deep wells and ultra-deep wells, and accordingly, the oil and gas well environment has higher pressure, higher temperature and higher corrosivity, and particularly, the oil and gas contains a hydrogen sulfide corrosion medium, which puts higher requirements on the strength of the oil well pipe material and the hydrogen sulfide stress corrosion resistance.
In the American Petroleum institute Standard casing and tubing Spec 5CT, the available standardized sulfur-resistant pipe steel grades have four yield strengths of 80ksi (i.e., 551MPa), 90ksi (i.e., 620MPa), 95ksi (i.e., 655MPa) and 110ksi (i.e., 758MPa), while higher yield strength, such as 125ksi (i.e., 862MPa), steel grades have not been incorporated into the American Petroleum Institute (API) standards because the state of the art in research and production is not yet mature. For low alloy steel, strength and hydrogen sulfide stress corrosion resistance are a pair of contradictory performance factors, and the hydrogen sulfide stress corrosion resistance of the low alloy steel is obviously reduced when the strength is improved. To ensure the strength and the sulfur resistance at the same time, only expensive high alloy stainless steel or nickel base alloy of more than 13Cr can be adopted at present, and almost none of low alloy steel is adopted. At present, the batch production and application of 125ksi steel-grade sulfur-resistant oil well pipes are not realized at home and abroad, and the strength of the material is improved at the cost of sacrificing the sulfur-resistant performance in the existing patent.
Chinese patent publication No. CN103160752A, published as 2013, 6 and 19, and entitled "a high-strength seamless steel pipe excellent in low-temperature toughness and a manufacturing method thereof" discloses a high-strength seamless steel pipe excellent in low-temperature toughness, which comprises the following components: c: 0.15% -0.20%, Si: 0.20-0.30%, Mn: 0.20-0.50%, P is less than or equal to 0.010%, S: less than or equal to 0.003 percent, Cr: 0.6-0.8%, Mo: 0.4% -0.7%, Ni: 1.0% -1.4%, Nb: 0.01-0.035%, Als: 0.01 to 0.05 percent of the total weight of the oil well pipe, and a Cr-Mo-Ni system is adopted to obtain the 125ksi steel-grade oil well pipe, although the toughness is greatly improved, the impact power at the temperature of minus 60 ℃ reaches more than 40J, but the sulfur resistance is not ensured.
Chinese patent publication No. CN103966524A, published as 2014 8/6, entitled "sulfide stress cracking resistant oil pipe and casing pipe and method for manufacturing the same" discloses a sulfide stress cracking resistant oil pipe and casing pipe, which comprises the following components: 0.12% -0.20%, Si: 0.15-0.40%, Mn: 0.30% -1.00%, P: 0.015% or less, S: 0.010% or less, Cr: 0.50% -1.60%, Mo: 0.60% -1.20%, Ni: 0.50% -2.0%, Nb: 0.02% -0.08%, Ti: 0.005-0.015%, Al: 0.01-0.10%, Ca: 0.001% -0.01%, B: 0.001% or less, N: 0.005-0.03%, and the invention optimizes the content of Cr, Mo, Ni and Nb and reduces the content of C to ensure that M in the tempered martensite structure23C6Type carbide, M3The C-type carbide and the ratio of the average Cr concentration to the average Fe concentration contained in the carbide are controlled within a certain range, so that the 125ksi steel grade oil casing pipe with a fine and uniform tempered martensite structure is obtained.
In view of the above, it is desirable to obtain a 125ksi steel-grade oil well pipe which has high strength and excellent hydrogen sulfide stress corrosion resistance, and can be widely applied to the fields of petroleum and natural gas exploitation in an environment containing hydrogen sulfide.
Disclosure of Invention
The invention aims to provide a 125ksi steel grade sulfur-resistant oil well pipe which has higher strength and excellent hydrogen sulfide stress corrosion resistance and can be widely applied to the fields of oil and gas exploitation in an environment containing hydrogen sulfide and the like.
In order to achieve the purpose, the invention provides a 125ksi steel grade sulfur-resistant oil well pipe, which comprises the following chemical elements in percentage by mass:
c: 0.20 to 0.30%, Si: 0.1 to 0.5%, Mn: 0.2-0.6%, Cr: 0.30-0.70%, Mo: 0.60-1.00%, V: 0.10 to 0.20%, Nb: 0.01-0.06%, Ti: 0.015-0.035%, W: 0.20-0.60%, less than or equal to 0.1% of Al, less than or equal to 0.008% of N, and the balance of Fe and other inevitable impurities.
The design principle of each chemical element in the 125ksi steel grade sulfur-resistant oil well pipe is as follows:
c: c is an important element for ensuring strength and hardenability. When the content of C is low, the strength is difficult to ensure, and the precipitation of proeutectoid ferrite is difficult to avoid, so that the sulfur resistance is influenced. When the C content is too high, quench cracking is liable to occur, and coarse grain boundary carbides M are increased23C6Thereby affecting the sulfur resistance. Therefore, the inventor controls the mass percent of C in the 125ksi steel-grade sulfur-resistant oil well pipe to be 0.20-0.30%.
Si: si is an element introduced by a deoxidizer in steel, and when the content thereof exceeds 0.5%, the cold brittleness tendency of steel is remarkably increased, and when the content thereof is less than 0.1%, the deoxidizing effect is impaired. Therefore, the inventor limits the mass percent of Si in the 125ksi steel-grade sulfur-resistant oil well pipe to 0.1-0.5%.
Mn: mn is also an element brought by a deoxidizer, has the beneficial effects of enlarging an austenite phase region, increasing hardenability and refining grains, but is easy to segregate during solidification, so that an obvious banded structure in a final product is caused, and the sulfur resistance of steel is influenced due to the obvious difference of hardness and precipitated phases between the banded structure and a matrix. Therefore, the mass percentage of Mn needs to be limited to 0.6% or less. In order to ensure the deoxidation effect, the mass percentage of Mn needs to be limited to 0.2% or more. Therefore, the inventor limits the mass percent of Mn in the 125ksi steel-grade sulfur-resistant oil well pipe to 0.2-0.6%.
Cr: cr is an element for improving strength and hardenability, and is beneficial to improving corrosion resistance. However, too high Cr content causes coarse Cr precipitation in grain boundaries during tempering23C6Carbide, unfavorable to hydrogen sulfide stress resistanceTherefore, the inventor limits the mass percent of Cr in the 125ksi steel-grade sulfur-resistant oil well pipe to 0.30-0.70%.
Mo: mo is an element for improving the strength and the hardenability, and is beneficial to improving the corrosion resistance. The precipitation of Mo carbide during high-temperature tempering improves the tempering resistance, so that enough Mo must be added to ensure the strength and the high-temperature tempering resistance, but Mo is a precious element and can obviously increase the cost, and the precipitation of coarse carbide can be caused by too high Mo, so that the hydrogen sulfide stress corrosion resistance is not facilitated. Therefore, the inventor limits the mass percent of Mo in the 125ksi steel-grade sulfur-resistant oil well pipe to 0.60-1.00%.
V: v is an effective refined grain element and can play a role in precipitation strengthening and improving high-temperature tempering resistance. V can ensure that the dislocation density of the steel is reduced during high-temperature tempering, so that the tiny VC precipitated phase is favorably precipitated, and the tiny VC precipitated phase is a good hydrogen trap and can improve the resistance to hydrogen sulfide stress corrosion. However, too high V causes temper brittleness, which affects the toughness of the steel and reduces the hydrogen sulfide stress corrosion resistance of the steel. Therefore, the inventor limits the mass percent of V in the 125ksi steel-grade sulfur-resistant oil well pipe to 0.10-0.20%.
Nb: nb is an effective refined grain element, and the refinement of the grain is beneficial to improving the strength, toughness and hydrogen sulfide stress corrosion resistance of steel, so that the mass percent of the Nb element in the 125ksi steel-grade sulfur-resistant oil well pipe is limited to 0.01-0.06%.
Ti: ti is also an effective grain refining element and can play a role in fixing N. However, too high Ti forms coarse TiN inclusions which are detrimental to the hydrogen sulfide stress corrosion resistance of the steel. Therefore, the inventor limits the mass percent of Ti in the 125ksi steel-grade sulfur-resistant oil well pipe to 0.015-0.035%.
W: w can remarkably improve the hardenability and the mechanical property of the steel. W also improves the temper resistance of the steel, so that Mo content in the steel is increased without causing further coarsening of M23C6Precipitation of type carbides and KSI carbides, but rather fine, uniformly precipitated MC type carbides. In addition, W can ensure that the steel still has higher strength after being tempered at higher temperature or for longer tempering time, thereby greatly reducing the dislocation density and improving the hydrogen sulfide stress corrosion resistance of the steel. Because the beneficial effect of the W is not obvious when the adding amount of the W is less, and the cold brittleness of steel is increased when the adding amount of the W is too much, the inventor limits the mass percent of the W in the 125ksi steel-grade sulfur-resistant oil well pipe to be 0.20-0.60%.
Al: al is an element necessary for deoxidizing steel, so that the Al can not be completely prevented from being brought into the steel, but the Al content of the steel exceeds 0.1 percent, so that the casting process of the steel is adversely affected, and therefore, the inventor limits the mass percent of Al in the 125ksi steel-grade sulfur-resistant oil well pipe of the invention to be less than or equal to 0.1 percent of Al, and preferably, less than or equal to 0.05 percent of Al.
N: the strength and the hardness of the steel can be effectively improved by adding N into the steel, but the steel can be segregated at grain boundaries so as to reduce the hydrogen sulfide stress corrosion resistance of the steel, so that the inventor limits the mass percent of N in the 125ksi steel-grade sulfur-resistant oil well pipe to be less than or equal to 0.008 percent.
Further, in the 125ksi steel grade sulfur-resistant oil well pipe, Cr and Mo satisfy the following conditions: 2.4 is less than or equal to [ Cr% ] +3[ Mo% ]isless than or equal to 3.5.
In the technical scheme of the invention, in order to ensure that the 125ksi steel-grade sulfur-resistant oil well pipe has excellent hydrogen sulfide stress corrosion resistance, and simultaneously to avoid precipitation of large-size precipitated phases caused by excessively high content of Cr and Mo, which is unfavorable for the hydrogen sulfide stress corrosion resistance of the steel, the inventor finds through research that the Cr and Mo elements should satisfy the relation: 2.4 ≦ Cr% +3[ Mo% ] ≦ 3.5, wherein Cr and Mo respectively represent mass percentages thereof, and values when the above-defined formula is substituted should be substituted for values before the percentage, for example, when the mass percentage of Cr is 0.45% and the mass percentage of Mo is 0.75%, the values when the formula is substituted are 0.45 and 0.75, respectively, whereby [ Cr% ] +3[ Mo% ] ≦ 0.45+3 × 0.75 ≦ 2.7 is calculated.
Furthermore, in the 125ksi steel grade sulfur-resistant oil well pipe, among the other inevitable impurities, S is less than or equal to 0.004%, P is less than or equal to 0.015%, and O is less than or equal to 0.01%.
In the technical scheme of the invention, other inevitable impurities mainly comprise S, P and O. S is a harmful element in steel, and the existence of the S has adverse effects on the corrosion resistance, the hot workability and the toughness of the steel, so the content of S is as small as possible, and the mass percent of the S element in the 125ksi steel-grade sulfur-resistant oil well pipe is limited to less than or equal to 0.004 percent, preferably less than or equal to 0.001 percent. P is a harmful element in steel, the existence of the P has adverse effects on the corrosion resistance and the toughness of the steel, so the content of the P is also as small as possible, and the mass percentage of the P element in the 125ksi steel grade sulfur-resistant oil well pipe is limited to P less than or equal to 0.015 percent, and preferably, P less than or equal to 0.01 percent. O is an element for reducing the corrosion resistance and the toughness of steel, the content of the inclusions is higher due to the fact that the content of the O in the steel is too high, therefore, the content of the O in the steel is strictly controlled, and the mass percent of the O element in the 125ksi steel-grade sulfur-resistant oil well pipe is limited to be less than or equal to 0.01 percent, and preferably less than or equal to 0.005 percent.
Furthermore, the microstructure of the 125ksi steel grade sulfur-resistant oil well pipe is a tempered sorbite.
Further, the 125ksi steel grade sulfur-resistant oil well pipe is characterized by H resistance2K of S stress corrosion ability1SSCThe value is more than or equal to 27.5MPa m1/2。
Accordingly, another object of the present invention is to provide a method for manufacturing the above-mentioned 125ksi steel-grade sulfur-resistant oil well pipe, which is low in cost, and the manufactured 125ksi steel-grade sulfur-resistant oil well pipe has high strength and excellent hydrogen sulfide stress corrosion resistance through reasonable process design.
In order to achieve the purpose, the invention provides a manufacturing method of the 125ksi steel-grade sulfur-resistant oil well pipe, which comprises the following steps:
(1) preparing a tube blank;
(2) perforating and hot rolling the tube blank to obtain a pierced billet;
(3) cooling the pierced billet in an on-line control cooling mode;
(4) quenching and tempering are adopted for primary quenching and tempering heat treatment: wherein in the quenching step, the quenching temperature is Ac3+ (30-50 ℃), wherein Ac3 (DEG C) is 910-]1/2+44.7[Si％]+104[V％]+31.5[M o％]+13.1[W％]Then water quenching is carried out, wherein the water quenching speed is more than or equal to 30 ℃/s; wherein in the tempering step, the tempering temperature is 680-700 ℃, and then air cooling is carried out.
In the manufacturing method according to the present invention, in the step (1), in some embodiments, electric furnace smelting is performed first, and then the smelted molten steel is cast into an ingot and then forged or rolled into a tube blank. In the step (3), in some embodiments, the hot-rolled pierced billet is rapidly passed through an annular cooling device with a water-cooling nozzle, and the pierced billet is subjected to online controlled cooling by controlling the water pressure and flow of the nozzle and the roller bed conveying speed of the pierced billet so as to obtain a uniform and fine bainite structure. In the step (4), in some embodiments, in the quenching step, the cooled pierced billet is heated to Ac3+ (30-50 ℃), then is kept for 0.5-1h, and then is subjected to water quenching; in the tempering step, the quenched pierced billet is tempered in a tempering furnace at the tempering temperature of 680-700 ℃ for 1.5-2.5h, and then air-cooled so as to obtain a tempered sorbite structure.
In the step (4), the quenching temperature in the quenching step is Ac3+ (30-50 ℃), where Ac3 (. degree. C.) is 910-]1/2+44.7[Si％]+104[V％]+31.5[Mo％]+13.1[W％]In the formula, C, Si, V, Mo and W each represent a mass percentage thereof, and values when the above-defined formula is substituted should be substituted before the percentile, for example, when the mass percentage of C is 0.25%, the mass percentage of Si is 0.21%, the mass percentage of V is 0.11%, the mass percentage of Mo is 0.75%, and the mass percentage of W is 0.45%, the values when the formula is substituted are 0.25, 0.21, 0.11, 0.75 and 0.45, respectively, whereby Ac3 (. degree.C.) is calculated as 910-]1/2+44.7[Si％]+104[V％]+31.5[Mo％]+13.1[W％]＝910-203×0.251/2+44.7×0.21+104×0.11+31.5×0.75+13.1×0.45＝858.8。
In addition, the manufacturing method obtains uniform and fine bainite structures through an online controlled cooling process, so that the manufacturing method can obtain smaller grain structures after only one quenching and tempering heat treatment, thereby obtaining the 125ksi steel-grade sulfur-resistant oil well pipe.
Further, in the manufacturing method of the present invention, in the step (3), the cooling rate is controlled to be 10 to 30 ℃/s, and the final cooling temperature is controlled to be (Bs ± 30) ° C, wherein the bainite transformation temperature Bs is 830-.
In the manufacturing method of the present invention, in the step (3), the cooling rate is controlled to be 10 to 30 ℃/s because the bainite structure cannot be obtained due to an excessively high cooling rate, and pearlite is formed due to an excessively low cooling rate. Note that the bainite transformation temperature Bs is 830-90 [ Mn% ] -70[ Cr% ] -83[ Mo% ], where C, Mn, Cr, and Mo in the formula represent their respective mass percentages, and the values obtained when the above-described limiting equations are substituted are values before the percentage, for example, when the mass percentage of C is 0.25%, the mass percentage of Mn is 0.53%, the mass percentage of Cr is 0.45%, and the mass percentage of Mo is 0.75%, the values obtained when the equations are substituted are 0.25, 0.53, 0.45, and 0.75, respectively, whereby Bs 830-90 [ Mn% ] -70[ Cr% ] -83[ Mo% ] -830 × 0.25-90 × 0.53-70 × 0.45-83 × 0.75 ═ 621.1 is calculated.
Further, in the manufacturing method, in the step (2), the tube blank is heated to 1050-1250 ℃, and after heat preservation for 1-3 hours, pierced holes and hot rolled to obtain a pierced billet.
Further, in the manufacturing method according to the present invention, in the step (2), the finish rolling temperature of the hot rolling is controlled to 900 ℃ or higher to ensure that the pierced billet has an all-austenite structure at the end of the finish rolling.
Further, in the manufacturing method according to the present invention, in step (3), cooling by cold wire is completed and then cooling by cold bed is performed.
Compared with the prior art, the 125ksi steel-grade sulfur-resistant oil well pipe and the manufacturing method thereof have the following beneficial effects:
(1) through reasonable component design, the 125ksi steel grade sulfur-resistant oil well pipe has low cost, higher strength and excellent hydrogen sulfide stress corrosion resistance, and can be widely applied to the fields of petroleum and natural gas exploitation in environments containing hydrogen sulfide and the like.
(2) The manufacturing method of the 125ksi steel-grade sulfur-resistant oil well pipe obviously reduces the manufacturing cost through the optimized process design, and ensures the yield strength (R) of the manufactured 125ksi steel-grade sulfur-resistant oil well pipet0.7) Not less than 125ksi (i.e., 862MPa), and characterize the H resistance2K of S stress corrosion ability1SSCThe value is more than or equal to 27.5MPa m1/2。
Detailed Description
The 125ksi steel grade sulfur-resistant oil well pipe and the method for manufacturing the same according to the present invention will be further explained and illustrated in the following specific examples, which, however, should not be construed to unduly limit the technical solution of the present invention.
Examples 1 to 6 and comparative examples 1 to 10
Tables 1-1 and tables 1-2 list the mass percentages of the chemical elements in the 125ksi steel grade sulfur-resistant oil well pipes of examples 1-6 and comparative examples 1-10.
TABLE 1-1. (wt%, balance Fe and unavoidable impurities other than P, S, O)
Tables 1-2 (wt%, balance Fe and inevitable impurities other than P, S, O)
| Serial number | Ti | W | Al | O | N | [Cr％]+3[Mo％] |
| Example 1 | 0.022 | 0.45 | 0.06 | 0.009 | 0.006 | 2.7 |
| Example 2 | 0.032 | 0.58 | 0.09 | 0.005 | 0.005 | 2.52 |
| Example 3 | 0.015 | 0.21 | 0.04 | 0.002 | 0.007 | 3.16 |
| Example 4 | 0.033 | 0.36 | 0.07 | 0.004 | 0.006 | 2.92 |
| Example 5 | 0.019 | 0.25 | 0.06 | 0.007 | 0.005 | 3.48 |
| Example 6 | 0.034 | 0.41 | 0.08 | 0.008 | 0.002 | 2.84 |
| Comparative example 1 | 0.031 | 0.17 | 0.06 | 0.003 | 0.004 | 2.7 |
| Comparative example 2 | 0.028 | 0.32 | 0.04 | 0.002 | 0.003 | 2.58 |
| Comparative example 3 | 0.032 | 0.36 | 0.06 | 0.008 | 0.006 | 2.27 |
| Comparative example 4 | 0.019 | 0.27 | 0.07 | 0.005 | 0.002 | 3.6 |
| Comparative example 5 | 0.021 | 0.62 | 0.05 | 0.003 | 0.004 | 3.47 |
| Comparative example6 | 0.013 | 0.32 | 0.06 | 0.006 | 0.008 | 2.57 |
| Comparative example 7 | 0.036 | 0.38 | 0.08 | 0.007 | 0.008 | 2.65 |
| Comparative example 8 | 0.033 | 0.36 | 0.07 | 0.004 | 0.006 | 2.92 |
| Comparative example 9 | 0.033 | 0.36 | 0.07 | 0.004 | 0.006 | 2.92 |
| Comparative example 10 | 0.033 | 0.36 | 0.07 | 0.004 | 0.006 | 2.92 |
Note: in the table, [ Cr% ] +3[ Mo% ], wherein Cr and Mo each represent a mass percentage thereof, and the numerical values when substituted into the above-defined formulas should be substituted into numerical values before the percentile.
The 125ksi steel grade sulfur-resistant oil well pipes of examples 1-6 and comparative examples 1-10 were prepared by the following steps (see tables 2-1 and 2-2 for specific process parameters):
(1) according to the mass percentages of the chemical elements in the tables 1-1 and 1-2, the electric furnace smelting is carried out, then the smelted molten steel is cast into cast ingots, and then the cast ingots are rolled into the steelThe tube blank of (2).
(2) Heating the tube blank to 1050-1250 ℃, preserving heat for 1-3 hours, perforating and hot rolling to obtain a pierced billet, wherein the final rolling temperature of the hot rolling is controlled to be above 900 ℃.
(3) And (3) rapidly passing the hot-rolled pierced billet through an annular cooling device with a water-cooling nozzle, and performing online controlled cooling on the pierced billet by controlling the water pressure and flow of the nozzle and the roller way conveying speed of the pierced billet. Controlling the cooling speed to be 10-30 ℃/s, controlling the final cooling temperature to be (Bs +/-30) ° C, wherein the bainite transformation temperature Bs is 830-. It should be noted that the bainite transformation temperature Bs is 830-270[ C% ] -90[ Mn% ] -70[ Cr% ] -83[ Mo% ], wherein C, Mn, Cr, and Mo each represent their respective mass percentages, and the values when the above-described limiting formula is substituted into the values before the percentage numbers.
(4) Quenching and tempering are adopted for primary quenching and tempering heat treatment: wherein in the quenching step, the quenching temperature is Ac3+ (30-50 ℃), wherein Ac3 (DEG C) is 910-]1/2+44.7[Si％]+104[V％]+31.5[M o％]+13.1[W％]Keeping the temperature for 0.5-1h, and then performing water quenching at a water quenching speed of more than or equal to 30 ℃/s. Wherein in the tempering step, the tempering temperature is 680-700 ℃, the heat preservation time is 1.5-2.5h, and then air cooling is carried out to obtain the product with the specification of125ksi steel grade sulfur-resistant oil well pipe. Note that Ac3 (. degree. C.) is 910-]1/2+44.7[Si％]+104[V％]+31.5[Mo％]+13.1[W％]In the formula, C, Si, V, M o, and W each represent their respective mass percentages, and the values when substituted into the above-defined formula should be substituted into the values before the percentile.
Tables 2-1 and 2-2 list the specific process parameters for the method of making the 125ksi steel grade sulfur-resistant oil well pipe of examples 1-6 and comparative examples 1-10.
Table 2-1.
Note: in the table, Bs is 830-.
Table 2-2.
Note: ac3 (. degree. C.) 910-]1/2+44.7[Si％]+104[V％]+31.5[Mo％]+13.1[W％]In the formula, C, Si, V, Mo and W each represent their respective mass percentages, and the numerical values when substituted into the above-defined formula should be substituted into numerical values before the percentile.
The 125ksi steel-grade sulfur-resistant oil well pipes of examples 1-6 and comparative examples 1-10 were subjected to performance tests, wherein the room temperature tensile property test was performed according to GB/T228.1-2000 standard, the hydrogen sulfide stress corrosion resistance was performed according to NACE TM0177-2005D method A solution test standard, and the test results are listed in Table 3.
Table 3.
As can be seen from Table 3, the 125ksi steel grade sulfur-resistant oil well pipes of examples 1-6 have yield strengths above 125ksi (i.e., 862MPa), and K, which is indicative of the resistance to hydrogen sulfide stress corrosionISCCThe value is 27.5MPa · m1/2The above.
Too low a W content in the 125ksi steel grade sulfur-resistant oil well pipe of comparative example 1 resulted in a decrease in sulfur resistance.
The 125ksi steel grade sulfur-resistant oil well pipe of the comparative example 2 has excessively low Cr and V contents, so that dispersed precipitated phases are reduced, and the grain refining effect is not obvious, thereby reducing the sulfur resistance.
The 125ksi steel grade sulfur-resistant oil well pipe of the comparative example 3 has excessively low Cr +3Mo, so that the corrosion resistance of the steel in an acid environment is reduced, and the sulfur resistance is also reduced.
The 125ksi steel grade sulfur-resistant oil well pipe of the comparative example 4 has overhigh Cr and Cr +3Mo, so that large-size precipitated phases in the steel are obviously increased, and the sulfur resistance is reduced.
The 125ksi steel grade sulfur-resistant oil well pipe of the comparative example 5 has over high Mo and W, so that the tempering resistance of the steel is obviously increased, the cold hardness is enhanced, and the sulfur resistance is reduced.
Compared with the 125ksi steel grade sulfur-resistant oil well pipe in the comparative example 6, both Nb and Ti are too low, so that dispersed precipitated phases are reduced, the grain refining effect is not obvious, and the sulfur resistance is reduced.
The 125ksi steel grade sulfur-resistant oil well pipe of the comparative example 7 has too high V, Nb and Ti, which causes the increase of coarse inclusion and precipitated phase in the steel and the obvious reduction of the sulfur resistance.
The 125ksi steel grade sulfur-resistant oil well pipe of comparative example 8, in which the pipe blank was not subjected to the on-line controlled cooling process after hot rolling, resulted in coarse and uneven structure obtained after the primary quenching and tempering heat treatment, thereby lowering the sulfur resistance.
In the 125ksi steel grade sulfur-resistant oil well pipe of the comparative example 9, the final cooling temperature of the pipe blank after hot rolling and online controlled cooling is not in the range of (Bs +/-30) DEG C, and bainite transformation cannot be realized, so that the structure obtained after primary quenching and tempering heat treatment is coarse and uneven, and the sulfur resistance is reduced.
The 125ksi steel grade sulfur-resistant oil well pipe of the comparative example 10 has a low cooling speed by wire cooling, so that a pearlite and bainite mixed structure is formed, grain refinement is not obvious after primary quenching and tempering heat treatment, and the sulfur resistance is reduced.
It should be noted that the prior art in the protection scope of the present invention is not limited to the examples given in the present application, and all the prior art which is not inconsistent with the technical scheme of the present invention, including but not limited to the prior patent documents, the prior publications and the like, can be included in the protection scope of the present invention.
In addition, the combination of the features in the present application is not limited to the combination described in the claims of the present application or the combination described in the embodiments, and all the features described in the present application may be freely combined or combined in any manner unless contradictory to each other.
It should also be noted that the above-mentioned embodiments are only specific embodiments of the present invention. It is apparent that the present invention is not limited to the above embodiments and similar changes or modifications can be easily made by those skilled in the art from the disclosure of the present invention and shall fall within the scope of the present invention.
Claims (10)
1. A125 ksi steel grade sulfur-resistant oil well pipe is characterized in that the weight percentage of chemical elements is as follows:
c: 0.20 to 0.30%, Si: 0.1 to 0.5%, Mn: 0.2-0.6%, Cr: 0.30-0.70%, Mo: 0.60-1.00%, V: 0.10 to 0.20%, Nb: 0.01-0.06%, Ti: 0.015-0.035%, W: 0.20-0.60%, less than or equal to 0.1% of Al, less than or equal to 0.008% of N, and the balance of Fe and other inevitable impurities.
2. The 125ksi steel grade sulfur-resistant oil well pipe of claim 1, wherein the elements Cr and Mo satisfy: 2.4 is less than or equal to [ Cr% ] +3[ Mo% ]isless than or equal to 3.5.
3. The 125ksi steel grade sulfur-resistant oil well pipe according to claim 1, wherein S is less than or equal to 0.004%, P is less than or equal to 0.015%, and O is less than or equal to 0.01% among the other inevitable impurities.
4. The 125ksi steel grade sulfur-resistant oil well pipe of claim 1, wherein the microstructure is tempered sorbite.
5. The 125ksi steel grade sulfur-resistant oil well pipe of claim 1, characterized by H resistance2K of S stress corrosion ability1SSCThe value is more than or equal to 27.5MPa m1/2。
6. The method of manufacturing a 125ksi steel grade sulfur-resistant oil well pipe according to any one of claims 1-5, comprising the steps of:
(1) preparing a tube blank;
(2) perforating and hot rolling the tube blank to obtain a pierced billet;
(3) cooling the pierced billet in an on-line control cooling mode;
(4) quenching and tempering are adopted for primary quenching and tempering heat treatment: wherein in the quenching step, the quenching temperature is Ac3+ (30-50 ℃), wherein Ac3 (DEG C) is 910-]1/2+44.7[Si％]+104[V％]+31.5[Mo％]+13.1[W％]Then water quenching is carried out, wherein the water quenching speed is more than or equal to 30 ℃/s; wherein in the tempering step, the tempering temperature is 680-700 ℃, and then air cooling is carried out.
7. The method as set forth in claim 6, wherein in the step (3), the cooling rate is controlled to be 10-30 ℃/s, and the final cooling temperature is controlled to be (Bs ± 30) ° C, wherein the bainite transformation temperature Bs is 830-.
8. The manufacturing method according to claim 6, wherein in the step (2), the tube blank is heated to 1050-1250 ℃, and after heat preservation for 1-3 hours, pierced and hot rolled to obtain a pierced tube.
9. The manufacturing method according to claim 8, wherein in the step (2), the finish rolling temperature of the hot rolling is controlled to be 900 ℃ or higher to ensure that the pierced billet has an all-austenite structure at the end of the finish rolling.
10. The production method according to claim 7, wherein in the step (3), cooling-bed air cooling is performed after the wire cooling by wire is completed.
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| CN201810638365.5A CN110616366B (en) | 2018-06-20 | 2018-06-20 | 125ksi steel grade sulfur-resistant oil well pipe and manufacturing method thereof |
| PCT/CN2019/087832 WO2019242448A1 (en) | 2018-06-20 | 2019-05-21 | 125ksi steel grade sulfur-resistant oil well pipe and fabrication method therefor |
| RU2020141593A RU2763722C1 (en) | 2018-06-20 | 2019-05-21 | SULPHUR-RESISTANT PIPE FOR A PETROLEUM BOREHOLE ATTRIBUTED TO THE KILOPOUND/INCH2 (862 MPa) STEEL STRENGTH CLASS, AND METHOD FOR MANUFACTURE THEREOF |
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| RU2763722C1 (en) | 2021-12-30 |
| CN110616366B (en) | 2021-07-16 |
| WO2019242448A1 (en) | 2019-12-26 |
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