CN108624810B - Low-cost high-strength high-sulfur-resistance oil well pipe and manufacturing method thereof - Google Patents
Low-cost high-strength high-sulfur-resistance oil well pipe and manufacturing method thereof Download PDFInfo
- Publication number
- CN108624810B CN108624810B CN201710494722.0A CN201710494722A CN108624810B CN 108624810 B CN108624810 B CN 108624810B CN 201710494722 A CN201710494722 A CN 201710494722A CN 108624810 B CN108624810 B CN 108624810B
- Authority
- CN
- China
- Prior art keywords
- oil well
- sulfur
- strength
- resistance
- well pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- 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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
-
- 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
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
Abstract
The invention discloses a low-cost high-strength high-sulfur-resistance oil well pipe, which comprises the following chemical elements in percentage by mass: c: 0.16-0.30%, Si: 0.1 to 0.5%, Mn: 0.2-0.6%, Cr: 0.30-0.70%, Mo: 0.40-0.90%, V: 0.07 to 0.11%, Nb: 0.01-0.06%, Ti: 0.005-0.035%, B: 0.0010-0.0025%, Sn: 0.01-0.10%, and the balance of Fe and other inevitable impurities. Correspondingly, the invention also discloses a manufacturing method of the oil well pipe with low cost, high strength and high sulfur resistance, which comprises the following steps: (1) preparing a tube blank; (2) manufacturing the tube blank into a pierced billet; (3) after rolling, controlling cooling (4) for air cooling; (5) primary quenching and tempering heat treatment: and (6) quenching and tempering.
Description
Technical Field
The invention relates to an oil well pipe and a manufacturing method thereof, in particular to an oil well pipe adopting low alloy steel and a manufacturing method thereof.
Background
With the increasing shortage of energy sources, the exploitation and development of oil and gas fields are developed towards deep wells and ultra-deep wells, the oil and gas well environment has higher pressure, higher temperature and higher corrosivity correspondingly, and particularly, oil and gas contain a hydrogen sulfide corrosion medium, which puts higher requirements on the high strength and the hydrogen sulfide corrosion resistance of oil well pipe materials.
In recent decades, major manufacturers at home and abroad have successfully developed series of strength-grade hydrogen sulfide-resistant low alloy steels with yield strengths increasing from 551MPa (80ksi), 620MPa (90ksi) to 655MPa (95ksi), while in recent years, 758MPa (110ksi) and 861MPa (125ksi) have high-strength-grade sulfur-resistant pipes.
At present, the majority of patent documents for high-strength sulfur-resistant pipes at home and abroad adopt a Cr-Mo-V system, and microalloy elements such as Nb, Ti, B and the like are added, for example:
international patent publication No. WO2007007678A1, published as 7.7.2006, entitled "LOW-ALLOY STEELFOR OIL WELL TUBE HAVING EXCELLENT SULFIDE STRESS CRACKING RESISTANCE", discloses a steel for LOW ALLOY OIL WELL pipes. The technical proposal disclosed in the patent document relates to a sulfur-resistant steel for oil well pipes with strength of 125ksi or more, which has excellent sulfur resistance (K) when the strength is kept at 861MPa by controlling the half width D and the hydrogen diffusion coefficient HISCC>25MPa*m1/2)。
European patent publications EP3026138A1, entitled "HIGH-STRENGTH STEELMATERIAL FOR OIL WELL USE, AND OIL WELL PIPE", on 2016, 6/1/2016, AND having publication numbers EP3026138A 1. In the technical scheme disclosed in the patent document, a component system of Ti and Nb microalloy is added into a Mo-V system, and a uniform bainite structure is obtained through bainite transformation heat treatment at 400-600 ℃ so as to keep the strength at 861MPa and still have excellent sulfur resistance.
International patent publication No. WO2006100891a1, published as 2016, 9, 28, and entitled "STEEL FOR oil well field PIPE HAVING EXCELLENT below grade STEEL STRESS CRACKING RESISTANCE AND metal FOR modeling oil well field SEAMLESS STEEL PIPE FOR oil well field" discloses STEEL FOR oil well pipes having EXCELLENT SULFIDE stress cracking resistance and a METHOD FOR producing seamless STEEL pipes FOR oil well pipes. In the technical scheme disclosed in the patent document, a Cr-Mo-V component system is adopted, and crystal grains are refined by twice or more repeated quenching and tempering heat treatments, so that higher strength and better sulfur resistance are obtained.
Generally, the target microstructures of steel grades with sulfur resistance requirements are tempered martensite, the tempered martensite has dispersed precipitated phases and martensite laths for recovery, the improvement of the sulfur resistance is favorable, but the improvement of the tempering temperature inevitably brings about the reduction of the material strength, and the improvement of the material strength sacrifices the sulfur resistance. Therefore, the high strength and the sulfur resistance of low alloy steel are contradictory.
Disclosure of Invention
The invention aims to provide a low-cost high-strength high-sulfur-resistance oil well pipe, which is obtained by reasonably adding and refining a microstructure of alloy elements.
In order to achieve the purpose, the invention provides a low-cost high-strength high-sulfur-resistance oil well pipe, which comprises the following chemical elements in percentage by mass:
c: 0.16-0.30%, Si: 0.1 to 0.5%, Mn: 0.2-0.6%, Cr: 0.30-0.70%, Mo: 0.40-0.90%, V: 0.07 to 0.11%, Nb: 0.01-0.06%, Ti: 0.005-0.035%, B: 0.0010-0.0025%, Sn: 0.01-0.10%, and the balance of Fe and other inevitable impurities.
In the prior art, in order to improve the strength after tempering and the stability of sulfur resistance, certain amount of alloy elements (usually Cr, Mo and V) need to be added, and the microstructure is controlled, which is mainly shown in the following steps: (1) the grain structure is refined. For example, the size of martensite lath bundles is refined by controlling the prior austenite grain size, so that a finer tempered structure is obtained to improve the sulfur resistance; or refining grains by secondary or even multiple quenching and tempering heat treatment to improve the sulfur resistance; or refining grains by V, Nb, Ti, B and other microalloy elements to improve the sulfur resistance; (2) controlling the precipitation amount of large-size precipitated phase. For example: raising the tempering temperature to avoid M23C, precipitation amount of large-size precipitated phase; another example is: control of Cr content to reduce M23Increasing M by increasing the amount of C precipitated and increasing Mo content2C. The amount of precipitated MC phase precipitated.
In the technical scheme of the invention, the microstructure is refined by reasonably adding and matching alloy elements, so that the low-cost high-strength high-sulfur-resistance oil well pipe is obtained. Improving the quenching of low alloy steel by adding a trace amount of Ti, B and NbPermeability, uniform and fine precipitated phases after tempering, and simultaneously, coarse and large M reduction by controlling lower Cr and C contents23C6And the precipitated phase is precipitated, so that the oil well pipe with low cost, high strength and high sulfur resistance has better sulfur resistance.
The design principle of each chemical element of the low-cost high-strength high-sulfur-resistance oil well pipe is as follows:
c: in the low-cost high-strength high-sulfur-resistance oil well pipe, C is an important element for ensuring the strength and the hardenability, and when the mass percent of C is less than 0.16%, on one hand, the strength of the oil well pipe is difficult to ensure, and on the other hand, the separation of pro-eutectoid ferrite is difficult to avoid, so that the sulfur resistance of the oil well pipe is influenced. When the mass percentage of C is more than 0.30%, cracks are likely to occur during quenching, and the tendency of coarse carbides to precipitate in grain boundaries is increased. Therefore, in the low-cost high-strength high-sulfur-resistance oil well pipe, the mass percent of C is controlled to be 0.16-0.30%.
Si: in the embodiment of the present invention, since Si is an element introduced by the deoxidizer in the steel and the tendency of cold shortness of the steel is remarkably increased when the mass percentage of Si exceeds 0.5%, the mass percentage of Si should be limited to 0.5% or less and it is necessary to maintain the mass percentage of Si to 0.1% or more in order to secure the deoxidizing effect. Therefore, in the low-cost high-strength high-sulfur-resistance oil well pipe, the mass percentage of Si is controlled to be in a range that Si: 0.1 to 0.5 percent.
Mn: in the low-cost high-strength high-sulfur-resistance oil well pipe, Mn is also brought into elements by a deoxidizer, and has the beneficial effects of expanding an austenite phase region, increasing hardenability, refining grains and the like. Therefore, the mass percentage of Mn is required to be limited to 0.6% or less, and in order to ensure the deoxidation effect, the mass percentage of Mn is required to be maintained at 0.2% or more. Therefore, in the low-cost high-strength high-sulfur-resistance oil well pipe, the mass percent of Mn is controlled to be Mn: 0.2 to 0.6 percent.
Cr: in the low-cost high-strength high-sulfur-resistance oil well pipe, Cr is an element for improving the strength and the hardenability and improving the corrosion resistance. However, too high a mass percentage of Cr causes coarse Cr precipitation at grain boundaries during tempering23C6 carbide is not beneficial to the hydrogen sulfide stress corrosion resistance of the low-cost high-strength high-sulfur-resistance oil well pipe, and in the low-cost high-strength high-sulfur-resistance oil well pipe, the mass percent of Cr is controlled to be within the range of Cr: 0.30-0.70%, preferably, controlled in the ratio of Cr: 0.35 to 0.65 percent.
Mo: in the low-cost high-strength high-sulfur-resistance oil well pipe, Mo is an element for improving the strength and the hardenability and improving the corrosion resistance. The carbide of Mo is separated out during high-temperature tempering to improve the tempering resistance, so enough Mo must be added for ensuring the strength and high-temperature tempering, but Mo is a precious element and can obviously increase the cost, and meanwhile, the too high mass percent of Mo can also cause the separation of coarse carbide to be unfavorable for resisting the stress corrosion of hydrogen sulfide, in the low-cost high-strength high-sulfur-resistant oil well pipe, the mass percent of Mo is controlled to be Mo: 0.40-0.90%, preferably, controlled in Mo: 0.40-0.80%.
V: in the low-cost high-strength high-sulfur-resistance oil well pipe, V is an effective refined crystal grain element, plays roles in precipitation strengthening and high-temperature tempering resistance improvement, can ensure that the dislocation density of steel is reduced during high-temperature tempering, and can improve the hydrogen sulfide stress corrosion resistance due to the fact that a precipitated fine VC precipitated phase is a good hydrogen trap. However, too high a mass percentage of V results in temper brittleness, resulting in toughness of the steel, and reduced stress corrosion resistance. Therefore, in the low-cost high-strength high-sulfur-resistance oil well pipe, the mass percentage of V is controlled to be 0.07-0.11%.
Nb: in the technical scheme of the invention, Nb is an effective grain refining element, and the grain refining has positive effects on the toughness and the sulfur resistance of steel, so a small amount of Nb is added, and the mass percent of Nb is preferably 0.01-0.06%.
Ti: in the technical scheme of the invention, Ti is a refined grain element like Nb, and also plays a role in fixing N, so that the mass percentage of acid-soluble element B is ensured, and Ti is generally matched with element B for use. Too high a mass percentage of Ti will form coarse TiN inclusions which are detrimental to the resistance of the oil well pipe to hydrogen sulfide stress corrosion. Therefore, in the technical scheme of the invention, the mass percent of Ti is controlled to be 0.005-0.035%.
B: in the low-cost high-strength high-sulfur-resistance oil well pipe, the B can obviously improve the hardenability of steel without increasing the quench cracking sensitivity of the steel, and trace B element is generally added to thick steel pipes. On the other hand, too high B content in percentage by mass causes poor thermoplasticity of oil well pipe steel and hot rolling defects, and on the other hand, coarse Fe is precipitated2B and Mo2And B, the stress corrosion resistance of the oil well pipe steel is damaged. Therefore, in the technical scheme of the invention, the mass percent of B is controlled to be 0.0010-0.0025%.
Sn: in the low-cost high-strength high-sulfur-resistance oil well pipe, Sn can improve the overpotential of the hydrogen evolution reaction of steel and reduce the corrosion of the steel in an acid environment. A small amount of Sn can be dissolved in the steel in a solid mode to improve the corrosion resistance of the steel in an acid environment, while Sn is used as a low-melting-point element, and excessively high Sn can increase the difficulty of hot working of the steel on one hand and reduce the toughness of the steel due to grain boundary segregation so as to reduce the stress corrosion resistance. Therefore, the mass percent of Sn is controlled to be 0.01-0.10%.
S: s is a harmful element in steel, and its presence adversely affects corrosion resistance, hot workability, toughness, etc. of steel, and therefore, in the aspect of the present invention, the mass percentage of S is limited to 0.004% or less, preferably, the mass percentage of S is controlled to 0.003% or less, and more preferably, the mass percentage of S is controlled to 0.001% or less.
P: p is a harmful element in steel, the presence of which adversely affects the corrosion resistance, toughness, etc. of steel, and therefore, the mass percentage of P is controlled to 0.015% or less, preferably 0.01% or less.
Al: al is an element necessary for deoxidizing steel, so that the introduction cannot be completely avoided, but the mass percent of Al exceeds 0.1%, so that the casting process and the like are adversely affected, therefore, in the technical scheme of the invention, the mass percent of Al is limited to be below 0.1%, and preferably, the mass percent of Al is controlled to be below 0.05%.
O: too high mass percentage of O means that the mass percentage of inclusions is also high, and therefore, O is an element that lowers corrosion resistance and toughness, and in the embodiment of the present invention, the mass percentage of O is strictly limited to 0.01% or less, and preferably, the mass percentage of O is controlled to 0.005% or less.
N: the addition of N into the steel can effectively improve the strength and the hardness of the steel, but segregation can also be generated at grain boundaries so as to reduce the sulfide stress corrosion resistance of the steel, so that the mass percent of N is limited to be less than 0.008 percent in the technical scheme of the invention.
Furthermore, the low-cost high-strength high-sulfur-resistance oil well pipe provided by the invention also meets the condition that [ Cr% ] +3[ Mo% ]ismore than or equal to 1.9.
According to the research of the inventor in the present application, the hydrogen sulfide stress corrosion resistance of Mo is three times of that of Cr in a certain mass percentage range, and in order to ensure that the low-cost high-strength high-sulfur-resistance oil well pipe has sufficient sulfur resistance and simultaneously avoid that the excessive Cr and Mo cause large-size precipitated phases to be unfavorable for hydrogen sulfide stress corrosion resistance, the mass percentages of Cr and Mo are limited to satisfy the relation: [ Cr% ] +3[ Mo% ]. gtoreq.1.9.
In addition, [ Cr% ] and [ Mo% ] respectively represent the mass fractions of the Cr and Mo elements in the low-cost, high-strength, and high-sulfur-resistant oil country tubular goods, that is, values calculated when substitution is not more than percentage, that is, when the mass percentage of Cr is 0.31% and the mass percentage of Mo is 0.65%, the arithmetic expression is 0.31+3 × 0.65.65 — 2.26 ≧ 1.9.
Further, in the low-cost high-strength high-sulfur-resistance oil well pipe of the present invention, the microstructure thereof is tempered martensite.
Further, in the present inventionThe yield strength of the oil well pipe with low cost, high strength and high sulfur resistance is more than or equal to 110Ksi after one-time quenching and tempering heat treatment, and the oil well pipe is H-resistant2S stress corrosion Property K1SCCThe value is more than or equal to 30MPa m1/2。
Another object of the present invention is to provide a method for manufacturing the above low-cost high-strength high-sulfur-resistance oil well pipe, in which the microstructure is refined by reasonable addition and matching of alloy elements and application of an on-line heat treatment technique, so as to obtain the low-cost high-strength high-sulfur-resistance oil well pipe, compared with the prior art in which grains are refined by two or more quenching and tempering heat treatments to ensure stability of strength and sulfur resistance, bainite transformation can be achieved by one quenching and tempering heat treatment, so as to obtain a smaller grain structure.
In order to achieve the above object, the present invention provides a method for manufacturing the above oil well pipe with low cost, high strength and high sulfur resistance, comprising the steps of:
(1) preparing a tube blank;
(2) manufacturing the tube blank into a pierced billet;
(3) and (3) controlling and cooling after rolling: controlling the cooling speed to be more than or equal to 20 ℃/s, and controlling the final cooling temperature to be (Bs +/-30) DEG C, wherein Bs represents the bainite transformation temperature, and Bs is 830-90 [ C% ] -90[ Mn% ] -70[ Cr% ] -83[ Mo% ];
(4) air cooling;
(5) primary quenching and tempering heat treatment: and (6) quenching and tempering.
In the above-mentioned embodiment, in step (3), [ C% ], [ Mn% ], [ Cr% ], [ Mo% ] respectively indicate the mass fractions of the elements C, Mn, Cr and Mo in the low-cost, high-strength and high-sulfur-resistant oil country tubular goods, i.e., the values calculated when substituting are the values before the percentage, that is, when the mass percentage of C is 0.16%, the mass percentage of Mn is 0.21%, the mass percentage of Cr is 0.31%, and the mass percentage of Mo is 0.65%, the arithmetic expression 830-270 × 0.16 is 0.16-90 × 0.21.21-70 × 0.31.31-83 × 0.65 is 350.65-692.25.
In some preferred embodiments, the hot rolled pierced billet passes through the annular cooling device with water-cooling nozzles rapidly, and the post-rolling controlled cooling is performed by controlling the water pressure and flow rate of the nozzles and the roller bed conveying speed of the pierced billet.
Further, in the manufacturing method of the invention, in the step (2), the tube blank is heated to 1050-1250 ℃, and is subjected to heat preservation for 1-3 hours, and then is perforated and hot rolled to form a pierced billet, wherein the final rolling temperature of the hot rolling is controlled to be above 900 ℃.
Further, in the production method according to the present invention, in the step (4), air cooling is performed using a cooling bed.
Further, in the manufacturing method of the present invention, in the step (5), the quenching process includes: heating the steel pipe to Ac3+ (30-50 ℃), preserving heat for 0.3-1 h, and then carrying out water-cooling quenching at the water quenching speed of more than or equal to 30 ℃/s.
Further, in the manufacturing method of the present invention, where Ac3 ═ 910-]1/2+44.7[Si％]+104[V％]+31.5[Mo％]Wherein the unit parameter of Ac3 is deg.C.
In the above scheme, [ C ]]、[Si％]、[V％]、[Mo％]The calculated values when representing the mass fractions of the elements C, Si, V and Mo in the low-cost, high-strength and high-sulfur-resistant oil well pipe, i.e. when the mass percentage of C is 0.16%, the mass percentage of Si is 0.15%, the mass percentage of V is 0.08%, and the mass percentage of Mo is 0.65%, the operational formula is Ac 3-910-203 × 0.16.16-1/2+44.7×0.15+104×0.08+31.5×0.65＝864.3。
Further, in the manufacturing method of the present invention, in the step (5), the tempering process includes: tempering temperature is more than 680 ℃, heat preservation time is 0.6-1.5 h, and then air cooling is carried out.
Compared with other high-steel-grade sulfur-resistant oil well pipes, the low-cost high-strength high-sulfur-resistant oil well pipe has the following characteristics:
the low-cost high-strength high-sulfur-resistance oil well pipe is based on a Cr-Mo-V component system, and high strength (such as yield strength Rt0.6 ≥ 110Ksi) and high hydrogen sulfide stress corrosion resistance (such as K) are obtained by adding trace elements such as Nb, Ti, B and Sn1SCC≥30MPa*m1/2)。
In the manufacturing method, the technology of controlling cooling to realize bainite transformation after rolling the hot rolled pipe can replace one-time off-line quenching and tempering heat treatment, and the strength and the stability of the sulfur resistance of the oil well pipe are prevented from being improved through two-time quenching and tempering heat treatment.
In addition, the low-cost high-strength high-sulfur-resistance oil well pipe has high hardenability, does not have high requirements on cooling speed of line cooling or water quenching speed of quenching heat treatment, can obtain corresponding bainite or martensite structures at relatively low cooling speed, and can be applied to producing couplings with large cross-section and wall thickness.
Detailed Description
The low-cost, high-strength and high-sulfur-resistance oil well pipe and the method for manufacturing the same according to the present invention will be further explained and illustrated with reference to the following specific examples, which, however, should not be construed as unduly limiting the technical scope of the present invention.
Examples 1 to 6 and comparative examples 1 to 8
Table 1 lists the mass percentages of the chemical elements in the low-cost, high-strength, high-sulfur-resistance oil country tubular goods of examples 1 to 6 and the comparative oil country tubular goods of comparative examples 1 to 8.
TABLE 1 (wt%, balance Fe and unavoidable impurity elements other than P, S, Al, O and N)
Note: bs in table 1 represents bainite transformation temperature, Bs 830-; ac3 in table 1 is 910-.
Examples 1-6 a method for manufacturing low-cost high-strength high-sulfur-resistance oil well pipes and comparative oil well pipes of comparative examples 1-8, comprising the steps of:
(1) smelting molten steel according to the mass ratio of chemical elements listed in Table 1, casting into ingots, and forging or rolling to obtain tube blanks;
(2) manufacturing the tube blank into a pierced billet: heating the tube blank to 1050-1250 ℃, preserving heat for 1-3 hours, perforating and hot rolling to prepare a pierced billet, wherein the final rolling temperature of the hot rolling is controlled to be above 900 ℃;
(3) and (3) controlling and cooling after rolling: controlling the cooling speed to be more than or equal to 20 ℃/s, and controlling the final cooling temperature to be (Bs +/-30) DEG C, wherein Bs represents the bainite transformation temperature, and Bs is 830-90 [ C% ] -90[ Mn% ] -70[ Cr% ] -83[ Mo% ];
(4) air cooling the cooling bed;
(5) primary quenching and tempering heat treatment: quenching and tempering, wherein the quenching process comprises the following steps: heating the steel pipe to Ac3+ (30-50 ℃), preserving heat for 0.3-1 h, and then carrying out water-cooling quenching at the water quenching speed of more than or equal to 30 ℃; the tempering process comprises the following steps: tempering temperature is more than 680 ℃, heat preservation time is 0.6-1.5 h, and then air cooling is carried out.
It should be noted that Ac3 is 910-.
Table 2 lists the specific process parameters in the manufacturing process of the low cost high strength high sulfur resistant oil well pipes of examples 1-6 and the comparative oil well pipes of comparative examples 1-8.
Table 2.
The low-cost, high-strength, high-sulfur-resistance oil well pipes of examples 1 to 6 and the comparative oil well pipes of comparative examples 1 to 8 were subjected to performance tests, and the results thereof are shown in Table 3, wherein the room-temperature tensile properties were examined according to GB/T228.1-2000 and the sulfur resistance was examined according to NACE TM0177-2005D method A solution test standard.
Table 3.
As can be seen from Table 3, the yield strength of the low-cost high-strength high-sulfur-resistant oil well pipes of the embodiments of the present invention is greater than or equal to 110Ksi (785MPa), and the high-strength high-sulfur-resistant oil well pipes are H-resistant2S stress corrosion Property K1SCCThe value is more than or equal to 30MPa m1/2。
Referring to tables 1 to 3, in comparative examples 1 to 6, although the manufacturing method of the present invention was adopted, since the mass ratio of the chemical elements adopted was the technical solution of the present invention, among them, comparative example 1 is insufficient in resistance to hydrogen sulfide stress corrosion in an acidic environment due to the absence of Sn element, in the comparative example 2, because the mass percent of B exceeds the range limited by the technical proposal of the invention, coarse boride is precipitated, and simultaneously, because the Cr +3Mo value is too low, the hydrogen sulfide stress corrosion resistance is insufficient, comparative example 3 the resistance of the oil country tubular good to hydrogen sulfide stress corrosion was reduced due to the increased segregation caused by too high mass percent of Mn, comparative example 4 is because insufficient addition of Ti and B resulted in insufficient hardenability of the steel grade to affect the hydrogen sulfide stress corrosion capability, comparative example 5 results in M because the mass percentages of Cr and Mo do not fall within the ranges defined in the present case.23C6The increase of precipitated phases leads to the decrease of sulfur resistance, while in comparative example 6, the decrease of precipitation strengthening due to insufficient addition of Cr results in the decrease of hydrogen sulfide stress corrosion resistance after strength is increased by lowering tempering temperature. In addition, although the mass ratio of the chemical elements in comparative example 7 is the same as that in the present embodiment, the sulfur resistance of the comparative oil well pipe is insufficient because the structure is refined without the controlled cooling after rolling in step (3) in the manufacturing method, and the sulfur resistance of the comparative oil well pipe is insufficient because the final cooling temperature of the controlled cooling after rolling is too low (not falling within the range of Bs ± 30 ℃) in comparative example 8 and bainite transformation is not achieved.
It should be noted that the above-mentioned embodiments are only specific examples of the present invention, and obviously, the present invention is not limited to the above-mentioned embodiments, and many similar variations exist. All modifications which would occur to one skilled in the art and which are, therefore, directly derived or suggested from the disclosure herein are deemed to be within the scope of the present invention.
Claims (7)
1. The oil well pipe with low cost, high strength and high sulfur resistance is characterized in that the oil well pipe comprises the following chemical elements in percentage by mass:
c: 0.16-0.30%, Si: 0.1 to 0.5%, Mn: 0.2-0.6%, Cr: 0.30-0.70%, Mo: 0.40-0.90%, V: 0.07 to 0.11%, Nb: 0.01-0.06%, Ti: 0.005-0.035%, B: 0.0010-0.0025%, Sn: 0.01-0.10%, and the balance of Fe and other inevitable impurities; wherein the Cr and Mo elements also meet the condition that [ Cr% ] +3[ Mo% ]ismore than or equal to 1.9;
wherein the low-cost high-strength high-sulfur-resistance oil well pipe adopts a post-rolling controlled cooling step and a primary quenching and tempering heat treatment step of quenching and tempering;
wherein in the post-rolling controlled cooling step: controlling the cooling speed to be more than or equal to 20 ℃/s, and controlling the final cooling temperature to be (Bs +/-30) DEG C, wherein Bs represents the bainite transformation temperature, and Bs is 830-90 [ C% ] -90[ Mn% ] -70[ Cr% ] -83[ Mo% ];
wherein in the primary quenching and tempering heat treatment step: the quenching process comprises the following steps: heating the steel pipe to Ac3+ (30-50 ℃), preserving heat for 0.3-1 h, and then carrying out water-cooling quenching at the water quenching speed of more than or equal to 30 ℃/s; the tempering process comprises the following steps: tempering temperature is more than 680 ℃, heat preservation time is 0.6-1.5 h, and then air cooling is carried out.
2. The low-cost high-strength high-sulfur-resistance oil well pipe according to claim 1, wherein the microstructure thereof is tempered martensite.
3. The low-cost high-strength sulfur-resistant oil well pipe according to claim 1, wherein the yield strength is 110Ksi or more and the H resistance is H resistance after only one quenching and tempering heat treatment2S stress corrosion Property K1SCCThe value is more than or equal to 30MPa m1/2。
4. The method for manufacturing a low-cost high-strength sulfur-resistant oil well pipe according to any one of claims 1 to 3, comprising the steps of:
(1) preparing a tube blank;
(2) manufacturing the tube blank into a pierced billet;
(3) controlling and cooling after rolling;
(4) air cooling;
(5) and the primary quenching and tempering heat treatment step.
5. The manufacturing method according to claim 4, wherein in the step (2), the tube blank is heated to 1050-1250 ℃, and is subjected to heat preservation for 1-3 hours, and then is perforated and hot rolled to form a pierced tube, wherein the finishing temperature of the hot rolling is controlled to be above 900 ℃.
6. The manufacturing method according to claim 4, wherein in the step (4), air cooling is performed using a cooling bed.
7. The method as claimed in claim 4, wherein Ac3 ═ 910-]1/2+44.7[Si％]+104[V％]+31.5[Mo％]Wherein the unit parameter of Ac3 is deg.C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710494722.0A CN108624810B (en) | 2017-06-26 | 2017-06-26 | Low-cost high-strength high-sulfur-resistance oil well pipe and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710494722.0A CN108624810B (en) | 2017-06-26 | 2017-06-26 | Low-cost high-strength high-sulfur-resistance oil well pipe and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108624810A CN108624810A (en) | 2018-10-09 |
| CN108624810B true CN108624810B (en) | 2020-06-23 |
Family
ID=63705657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710494722.0A Active CN108624810B (en) | 2017-06-26 | 2017-06-26 | Low-cost high-strength high-sulfur-resistance oil well pipe and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108624810B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109439853A (en) * | 2018-11-01 | 2019-03-08 | 天津中德应用技术大学 | Novel low-alloy super-strength steel and thermomechanical treatment process |
| CN112708730B (en) * | 2019-10-24 | 2022-10-21 | 宝山钢铁股份有限公司 | Ultrahigh collapse-resistant petroleum casing pipe and manufacturing method thereof |
| CN113637892B (en) * | 2020-05-11 | 2022-12-16 | 宝山钢铁股份有限公司 | High-strength anti-collapse petroleum casing pipe and manufacturing method thereof |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101245437A (en) * | 2007-02-15 | 2008-08-20 | 宝山钢铁股份有限公司 | High collapse-resistance and hydrogen sulphide-corrosion-resistant low alloy petroleum case pipe and method of manufacturing the same |
| CN101658879A (en) * | 2008-08-27 | 2010-03-03 | 宝山钢铁股份有限公司 | Method for manufacturing seamless steel pipe |
| CN101928886A (en) * | 2010-07-15 | 2010-12-29 | 南京钢铁股份有限公司 | Corrosion resistant steel for cargo oil tanks and application thereof |
| CN102296239A (en) * | 2010-06-25 | 2011-12-28 | 宝山钢铁股份有限公司 | High-strength anti-collapsing petroleum casing column and manufacturing method thereof |
| CN103014554A (en) * | 2011-09-26 | 2013-04-03 | 宝山钢铁股份有限公司 | Low-yield-ratio high-tenacity steel plate and manufacture method thereof |
| CN103602903A (en) * | 2013-11-25 | 2014-02-26 | 宝山钢铁股份有限公司 | High-strength carbon dioxide corrosion-resisting oil well pipe and manufacturing method thereof |
| CN104532132A (en) * | 2014-12-11 | 2015-04-22 | 宝山钢铁股份有限公司 | High-strength low-alloy oil well pipe for resisting stress corrosion of hydrogen sulfide and manufacture method of high-strength low-alloy oil well pipe |
| CN104937126A (en) * | 2013-01-16 | 2015-09-23 | 杰富意钢铁株式会社 | Stainless steel seamless tube for use in oil well and manufacturing process therefor |
| CN105239023A (en) * | 2015-11-18 | 2016-01-13 | 钢铁研究总院 | High-temperature acid chloride ion corrosion resistant steel plate and manufacturing method thereof |
-
2017
- 2017-06-26 CN CN201710494722.0A patent/CN108624810B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101245437A (en) * | 2007-02-15 | 2008-08-20 | 宝山钢铁股份有限公司 | High collapse-resistance and hydrogen sulphide-corrosion-resistant low alloy petroleum case pipe and method of manufacturing the same |
| CN101658879A (en) * | 2008-08-27 | 2010-03-03 | 宝山钢铁股份有限公司 | Method for manufacturing seamless steel pipe |
| CN102296239A (en) * | 2010-06-25 | 2011-12-28 | 宝山钢铁股份有限公司 | High-strength anti-collapsing petroleum casing column and manufacturing method thereof |
| CN101928886A (en) * | 2010-07-15 | 2010-12-29 | 南京钢铁股份有限公司 | Corrosion resistant steel for cargo oil tanks and application thereof |
| CN103014554A (en) * | 2011-09-26 | 2013-04-03 | 宝山钢铁股份有限公司 | Low-yield-ratio high-tenacity steel plate and manufacture method thereof |
| CN104937126A (en) * | 2013-01-16 | 2015-09-23 | 杰富意钢铁株式会社 | Stainless steel seamless tube for use in oil well and manufacturing process therefor |
| CN103602903A (en) * | 2013-11-25 | 2014-02-26 | 宝山钢铁股份有限公司 | High-strength carbon dioxide corrosion-resisting oil well pipe and manufacturing method thereof |
| CN104532132A (en) * | 2014-12-11 | 2015-04-22 | 宝山钢铁股份有限公司 | High-strength low-alloy oil well pipe for resisting stress corrosion of hydrogen sulfide and manufacture method of high-strength low-alloy oil well pipe |
| CN105239023A (en) * | 2015-11-18 | 2016-01-13 | 钢铁研究总院 | High-temperature acid chloride ion corrosion resistant steel plate and manufacturing method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108624810A (en) | 2018-10-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10851432B2 (en) | Ultra-high strength and ultra-high toughness casing steel, oil casing, and manufacturing method thereof | |
| CN101275207B (en) | Thermal processing method for H2S-corrosion-resistant tool joint for petroleum drill pipe | |
| CN110616366B (en) | 125ksi steel grade sulfur-resistant oil well pipe and manufacturing method thereof | |
| CN100500917C (en) | Sulfur erosion resisting steel smelting method | |
| CN105441801B (en) | A kind of superhigh intensity superhigh tenacity petroleum casing pipe and its TMCP manufacture methods | |
| CN103866203B (en) | A kind of heavy caliber high-strength bridge seamless steel pipe and TMCP production method thereof | |
| CN108004462B (en) | Oil casing pipe capable of resisting hydrogen sulfide stress corrosion cracking and manufacturing method thereof | |
| CN108624810B (en) | Low-cost high-strength high-sulfur-resistance oil well pipe and manufacturing method thereof | |
| CN102912245A (en) | N80-grade electric resistance welding steel for oil casings and method for manufacturing N80-grade electric resistance welding steel | |
| CA3032502C (en) | Sucker rod steel and manufacturing method thereof | |
| CN111607744B (en) | Thick-wall high-strength high-toughness petroleum casing pipe and manufacturing method thereof | |
| CN112708730B (en) | Ultrahigh collapse-resistant petroleum casing pipe and manufacturing method thereof | |
| CN110616365B (en) | High-strength expansion casing pipe and manufacturing method thereof | |
| JP6456986B2 (en) | Ultra-high strength and ultra-tough oil well pipe and method for producing the same | |
| WO2019179354A1 (en) | Low temperature resistant oil casing with high strength and high toughness, and manufacturing method thereof | |
| CN108118251B (en) | High-strength high-toughness perforating gun barrel and manufacturing method thereof | |
| CN107779744B (en) | A kind of bainite type X100 grades of seamless line pipes and its manufacturing method | |
| CN112522622B (en) | High-steel-grade oil well pipe and preparation method thereof | |
| CN114277310B (en) | anti-H 2 S-corrosion oil casing and manufacturing method thereof | |
| CN113637892B (en) | High-strength anti-collapse petroleum casing pipe and manufacturing method thereof | |
| CN112030066B (en) | Low-carbon martensitic steel, myriameter drilling machine lifting ring and preparation method thereof | |
| WO2023231981A1 (en) | High-strength petroleum pipe casing and manufacturing method therefor | |
| CN104630624A (en) | Steel for high frequency welded J55 casing pipe, casing pipe and manufacturing method of casing pipe | |
| CN116926413A (en) | N80 steel grade oil well pipe and manufacturing method thereof | |
| CN117004880A (en) | High-strength petroleum casing pipe and manufacturing method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |