CN102373374B - High strength sulfur resisting casing pipe and its heat treatment manufacturing method - Google Patents
High strength sulfur resisting casing pipe and its heat treatment manufacturing method Download PDFInfo
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Abstract
The invention relates to a high strength sulfur resisting casing pipe, which comprises the following chemical components: 0.25-0.35 wt% of C, 0.1-0.5 wt% of Si, 0.4-0.6 wt% of Mn, 0.1-0.6 wt% of Cr, 0.2-0.6 wt% of Mo, 0.03-0.15 wt% of V, less than 0.015 wt% of P, less than 0.010 wt% of S, and the balance Fe as well as inevitable impurity elements. In the invention, when a steel pipe is rolled, a quenching and tempering heat treatment is carried out twice. The quenching and tempering heat treatment comprises the steps of: during the first quenching and tempering heat treatment, keeping a heating temperature of 900DEG C-1000DEG C before quenching, conducting heat preservation for 45min-120min, then spraying water for quenching, and carrying out tempering at a temperature of 670DEG C-710DEG C, performing thermal insulation for 90min-150min, air cooling the pipe when taken out of a furnace; during the second tempering treatment, keeping a heating temperature of 850DEG C-950DEG C before quenching, conducting heat preservation for 45min-120min, then spraying water for quenching, and carrying out tempering at a temperature of 650DEG C-710DEG C, performing thermal insulation for 90min-150min, and air cooling the pipe when taken out of the furnace.
Description
Technical field
The present invention relates to a kind of seamless tubing and casing and thermal treatment manufacture method thereof of economical high-strength hydrogen-sulfide environmental corrosion-resistant.
Background technology
Hydrogen sulfide is a kind of sour gas that often runs in oil-gas exploration and mining process.Along with the continuous growth of world energy sources demand, the hydrocarbon resources that development difficulty is less is petered out, and people have to begin to develop the more abominable deep-well of geologic condition, ultra deep well, and often all contain hydrogen sulfide in these Oil/gas Wells.In the existing oil-gas field in the world about 1/3 all contains hydrogen sulfide.
Acid cure hydrogen in the Oil/gas Well can make ferrous materials generation sulfide-stress cracking (Sulfide Stress Cracking).This problem shows particularly outstandingly in high-strength low-alloy steel (High Strength Low Alloy Steel, HSLA).Because the hydrogen sulfide corrosion resistance of oil well pipe can be directly connected to oil field equipment and personnel's safety, so the sulfur resistance of high-strength low-alloy steel becomes the problem that each oil well pipe manufacturing enterprise and oil field user pay close attention to.The oil company removes when steel pipe is purchased and requires product to satisfy API Std (American Petroleum Institute; API) outside; also often have the requirement of hydrogen sulfide corrosion resistance energy; namely require steel pipe to meet the standard of NACE MR0175 with material, and carry out SSCC (Sulfide Stress Corrosion Cracking) by NACE TM0177 standard and test.
Along with the increase of well depth, the temperature and pressure of down-hole also increases.The deep-well of High Temperature High Pressure and ultra deep well are had higher requirement to the use properties of oil well pipe: both required oil well pipe to have very high intensity to bear the huge pressure in down-hole and weight, had again certain hydrogen sulfide corrosion resistance energy simultaneously.For the oil field user, the intensity by the anti-sulphur oil well pipe of further raising material can satisfy the requirement to use properties under the condition that does not increase the oil well pipe wall thickness, provides great facility thereby use for user's scene.Therefore, in recent years on the market to the demand of high strength sulfur resisting pipe always in strong growth.
In the past few decades, the production technology of high strength sulfur resisting pipe has obtained the development of advancing by leaps and bounds.Its minimum nominal yield strength (Specified Minimum Yield Strength) is brought up to 110ksi (758MPa) from 80ksi (552MPa), 90ksi (621MPa), 95ksi (655MPa) always.API takes in the anti-sulphur pipe of 90 and 95 grade of steels in the API 5CT/ISO11960 standard, and difference called after C90 and T95.The anti-sulphur pipe of 100 and 110 grade of steels is revenue standard not also, but is commonly referred to as C100 and C110.Only before 20 years, the production that has simultaneously the oil well pipe of high strength and high hydrogen sulfide corrosion resistant performance also is considered to impossible thing, and the anti-sulphur pipe of 110 grade of steels also just began to occur within the nearly more than ten years.2004, the anti-sulphur sleeve pipe of 125 grade of steels was successfully produced in SUMITOMO CHEMICAL metal company and BP and Statoil cooperation.These series product can also guarantee certain hydrogen sulfide corrosion resistance energy except having the minimum nominal yield strength up to 125ksi.This is the maximum intensity level that present in the world high steel grade sulfur resistant sleeve pipe can reach.Along with developing rapidly of modern material science and metallurgical technology, the oil well pipe that possesses simultaneously high strength and high hydrogen sulfide corrosion resistant performance can carry out now large-scale industrial production and be widely applied in the production of hydrocarbons all over the world, and the intensity rank of high steel grade sulfur resistant pipe also has the trend that further improves.
The high steel grade sulfur resistant sleeve pipe is had relatively high expectations to use properties, not only requires material to have very high intensity, also requires to have simultaneously certain hydrogen sulfide corrosion resistant ability.For high intensity oil casing tube, higher intensity will restrict its application in hydrogen-sulfide environmental, because for high steel grade oil sleeve pipe intensity and sulfur resistance conflict often, higher intensity generally can cause the reduction of sulfur resistance, and in order to obtain higher sulfur resistance, just must sacrifice certain intensity index.Therefore, in the process of design of alloy and process system formulation, must take into account the demand of the two, balance between intensity and sulfur resistance.In order to obtain simultaneously higher intensity and sulfur resistance, must control accurately and optimize the Microstructural Evolution process of material, make it in the alloy phase change process, give full play to the effect of grain refining, precipitation strength and raising resistance to tempering, and combine with rational heat treating regime, reach the purpose that makes the hydrodynamics maximum effect by reasonable use trace alloying element.
What the key of exploitation high strength sulfur resisting tubing and casing material was how rationally to control alloy carbide separates out form and the amount of separating out to reach best precipitating reinforcing effect and to improve the sulfur resistance of material.In the high-strength Cr-Mo steel alloy, the thick carbide such as the M that near crystal boundary, separate out
23C
6, M
3C etc. tend to become the thin spot of cracking in loading process, cause the generation of intergranular corrosion cracking, directly affect the sulfur resistance of material.Therefore, by adding trace alloying element and take rational heat treating regime to suppress thick Carbide Precipitation, and make tiny carbide be disperse evenly to distribute, but the anti intercrystalline corrosion of Effective Raise Cr-Mo steel cracking ability is improved its sulfur resistance.Trace alloying element in the steel is not to play a role separately, therefore often adopts the mode of compound interpolation in the middle of the use procedure of reality, in the hope of obtaining best strengthening effect with less alloy adding, reaches cost-benefit maximization.Adopting rational Cr-Mo is steel grade, and adds the alloying elements such as V, Nb, Ti, can when guaranteeing mechanical property, make material have good sulfur resistance.
Aspect Design of Heat Treatment Process, high-temperature tempering process is generally adopted in the production of high strength sulfur resisting pipe.Carbide Morphology and tempering temperature have close relationship.When the lesser temps tempering, M
3The C Carbide Morphology is mainly needle-like or lensing and is distributed in crystal boundary, becomes the starting point that intergranular corrosion cracking occurs, and the sulfur resistance of crystal boundary is harmful to.And by high tempering, M
3Nodularization can occur in the C carbide, and the distribution in material disperse is even more, thereby improved the corrosion resistance of grain boundaries.In addition, also can make the martensitic stucture after the quenching fully change the tempered sorbite tissue into by high tempering, eliminate and organize internal stress, reduce dislocation desity, obtain uniform and stable microstructure.Because dislocation desity is low, metastable organization is few, so it is also less to be conducive to the passage of hydrogen atom diffusion, its hydrogen sulfide corrosion resistance can be better through the stabilizing tissue behind the high tempering.In order further to improve the corrosion resistance of anti-sulphur pipe, each manufacturer has developed the heat treating method of own uniqueness separately, can effectively reduce the uneven distribution of element in the material, crystal grain thinning and alloy carbide, thereby obtain evenly tiny ferrite+alloy carbide tissue, improve the hydrogen sulfide corrosion resistance energy of material.
Have at present and introduce the above anti-sulphur pipe of 125ksi grade of steel and the prior art of method for manufacturing thereof, such as Unexamined Patent 8-311551 communique, Unexamined Patent 11-335731 communique, JP 2000-178682 communique, JP 2000-256783 communique, JP 2000-297344 communique, JP 2000-119798 communique.
Adopted the method for direct quenching in the disclosed technology of Unexamined Patent 8-311551 communique.By heat, make the alloying elements such as Nb, V fully dissolve in the austenite structure direct quenching after the thermal distortion.In drawing process subsequently, the Nb of solid solution, V separate out at matrix with the form of tiny carbide, produce strong precipitating reinforcing effect, thereby reach the purpose that improves mechanical property.Gone out the anti-sulphur tubing and casing product of intensity rank at 110-140ksi by this explained hereafter.
The disclosed technology of Unexamined Patent 11-335731 communique has gone out the anti-sulphur tubing and casing product of intensity rank at 110-140ksi by the optimization production of alloy composition.
Produced the anti-sulphur tubing and casing product of intensity rank at 110-140ksi by the method for control carbide morphology in JP 2000-178682 communique, JP 2000-256783 communique and the disclosed technology of JP 2000-297344 communique.
Adopt the method for separating out in a large number tiny V carbide to produce the anti-sulphur tubing and casing product of intensity rank at 110-140ksi in the disclosed technology of JP 2000-119798 communique.
The heat treatment mode of anti-sulphur pipe product is mainly taked modified thermal treatment, and all there is larger difficulty in the technique such as the disclosed induction heating of Unexamined Patent 8-311551 communique and direct quenching in the large production enforcement at the scene in the above technology.
All adopted traditional quenching-and-tempering process in Unexamined Patent 11-335731 communique, JP 2000-178682 communique, JP 2000-256783 communique, JP 2000-297344 communique and the disclosed technology of JP 2000-119798 communique, the yield strength scope of material has contained 110～140ksi, its variation range is wide, has exceeded the lower limit of 125ksi grade of steel.All adopted the B element to improve hardening capacity in the above technology.But must add Ti to prevent fragility BN after adding B, increase the control difficulty of smelting and the fluctuation of material property.In addition, also adopt resistance to tempering and the enhancing precipitating reinforcing effect of the alloying elements such as Nb, Ti, W, Zr to improve material in the alloy designs of above technology, greatly improved cost of alloy.
The modified treatment production manufacture method of the secondary of introducing ferrous materials is both at home and abroad also arranged, " thermal treatment process of sulfur resistant drill pipe joint " such as CN200510130669.3, " the HEAT TREATMENT OF STAINLESS STEEL " of JP60-063315A, " a kind of high-temperature antiwear alloy steel and the production method thereof " of CN00113555.4.
Wherein, JP60-063315A and CN00113555.4 are stainless steel and the wear resisting steels that is applied to high alloy content, to improve its intensity and wear resisting property as main purpose.The described secondary quenching-and-tempering process of CN200510130669.3 is applied to the production of low-alloy sulfur resistant drill pipe joint, take the hardening capacity that improves large wall thickness joint as main purpose.The method is take oil quenching as the quenching means.Be means there are no shrend so far, adopt the patent literature of the modified treatment production low-alloy of secondary anti-corrosion seamless steel tube.
Summary of the invention
The present invention is by proposing a kind of thermal treatment manufacture method of high strength sulfur resisting casing pipe, solved the sulfur-bearing ultra deep well and used the material problem with high strength sulfur resisting hydrogen-type corrosion tubing and casing.Alloying constituent by the appropriate design material, and carry out second heat treatment technique, when guaranteeing high steel grade sulfur resistant pipe corrosion resistance, can greatly reduce the alloy usage quantity of anti-sulphur tube material, cancelled the alloys such as Nb, Ti, W, Zr and added element, produced minimum nominal yield strength more than 125ksi and have the tubing and casing of good corrosion resistance.
The object of the present invention is to provide a kind of production to have the thermal treatment manufacture method of the tubing and casing of good hydrogen sulfide corrosion resistance energy.
High strength sulfur resisting casing pipe material produced according to the invention has following chemical ingredients (wt%):
C:0.25～0.35wt%, Si:0.1～0.5wt%, Mn:0.4～0.6wt%, Cr:0.1～0.6wt%, Mo:0.2～0.6wt%, V:0.03～0.15wt%, P＜0.015wt%, S＜0.010wt%, all the other are Fe and inevitable impurity element.
The high strength sulfur resisting casing pipe material generally adopts the Cr-Mo alloy system to guarantee good hardening capacity and temper resistance.Steel of the present invention adopts the low Mo alloy designs of the low Cr of economic low Mn, adopts the trace V alloy to carry out precipitation strength with the intensity rank of further raising material, and strictly controls S, P constituent content harmful in the steel.
Compare with anti-sulphur tube material before, because grain refining effect and precipitating reinforcing effect that the modified thermal treatment of secondary brings, adopt the alloy usage quantity of the anti-sulphur tube material of explained hereafter of the present invention obviously to reduce, and cancelled the adding of the alloying element of the costlinesses such as Nb, significantly reduced production cost.
According to the present invention, carry out 2 modified thermal treatment behind the steel pipe rolling.Modified heat treated concrete technology is as follows:
Heating temperature before quenching is 900 ℃-1000 ℃, insulation 45min-120min, spray quenching.Tempering temperature is 670 ℃-710 ℃, insulation 90min-150min, the rear air cooling of coming out of the stove.
The 1st modified heat treated main purpose is to adjust the microstructure of material, fully dissolves alloying element, is that the 2nd modified thermal treatment is ready in the material metallographic structure.Heating temperature before quenching is 930 ℃-1000 ℃, insulation 45min-120min, spray quenching.Tempering temperature is 570 ℃-650 ℃, insulation 90min-150min, the rear air cooling of coming out of the stove.V carbide in the anti-sulphur pipe is even and tiny, mainly with M
3The form of C and MC exists.The carbide of V has dystectic characteristics, need to just can dissolve to enter in the austenite under higher temperature condition.It is insufficient to be lower than 930 ℃ of austenitizings, has hot rolling microstructure to exist, and affects sulfur resistance and mechanical property.Be higher than 1000 ℃ or soaking time and surpass the phenomenon that Austenite Grain Growth then can appear in 120min, infringement hydrogen sulfide corrosion resistance energy.The heat tracing time before quenching fully dissolves in the austenite alloying element in the steel more than 45min, to guarantee the rear single-phase martensite tissue as much as possible that obtains that quenches.The quenched martensite of steel is organized more, and the microstructure after the tempering is more even, and its hydrogen sulfide corrosion resistance can be better.Tempering temperature should be higher than 570 ℃, to guarantee that quenched martensite can decompose, obtains evenly tiny tempered sorbite tissue.
In the 2nd modifier treatment, the Heating temperature before quenching is 850 ℃-950 ℃, insulation 45min-120min, spray quenching.Tempering temperature is 650 ℃-710 ℃, insulation 90min-150min, the rear air cooling of coming out of the stove.In the 2nd the modified thermal treatment, again dissolve in tiny alloy carbide in the austenite structure by austenitizing again, but because the 1st modified thermal treatment distributes a large amount of disperses of tiny carbide, dystectic alloy carbides such as a part of Mo, V can be remained on the high temperature austenite matrix, stoped growing up of austenite crystal in the insulating process, effectively refinement grain structure.After the 2nd modified thermal treatment, can obtain more evenly tiny microstructure, further improved the homogeneity of material, guarantee the good corrosion resistance of high strength sulfur resisting pipe.By giving full play to crystal grain thinning and the precipitation strength effect of material interalloy element in thermal treatment, can reduce the usage quantity of alloying element, avoid too much alloying element to damage corrosion resistance because can not fully dissolving at austenitic matrix formation macrobead shape carbide.
Hot straightening temperature after the tempering should be higher than 480 ℃, to reduce the unrelieved stress that produces because of aligning, is conducive to improve the sulfur resistance of material.
Steel grade of the present invention can reach after tube rolling and thermal treatment: yield strength: Rt0.65 〉=862MPa; Tensile strength: Rm 〉=932MPa; Unit elongation: A50.8 〉=19%; Impelling strength: vertical Akv 〉=90J; Horizontal Akv 〉=90J; Hydrogen sulfide corrosion resistance can be excellent.
Description of drawings
Fig. 1 is the grain fineness number of the 125ksi steel grade sulfur resistant pipe of explained hereafter of the present invention.
Fig. 2 is the grain fineness number of the 125ksi steel grade sulfur resistant pipe of traditional technology (i.e. once modified thermal treatment) production.
Embodiment
Below by specific embodiment the present invention is described in detail.
Table 1 is the chemical ingredients of embodiments of the invention and comparative example.
Embodiment 1
Smelt by the chemical ingredients in the table 1, then cast and rolling carries out the 1st modifier treatment, and wherein, the Heating temperature before quenching is 930 ℃, insulation 45min, spray quenching.Tempering temperature is 570 ℃, insulation 90min, the rear air cooling of coming out of the stove.Carry out the 2nd modifier treatment, wherein, the Heating temperature before quenching is 850 ℃, insulation 45min, spray quenching again.Tempering temperature is 650 ℃, insulation 90min, the rear air cooling of coming out of the stove.
Table 1, the chemical ingredients of embodiments of the invention and comparative example, wt%
| C | Si | Mn | Cr | Mo | V | Nb | Ti | P | S | |
| Embodiment 1 | 0.25 | 0.1 | 0.4 | 0.1 | 0.2 | 0.03 | - | - | ＜0.015 | ＜0.01 |
| Embodiment 2 | 0.3 | 0.25 | 0.5 | 0.25 | 0.4 | 0.05 | - | - | ＜0.015 | ＜0.01 |
| Embodiment 3 | 0.27 | 0.35 | 0.6 | 0.45 | 0.6 | 0.15 | - | - | ＜0.015 | ＜0.01 |
| Embodiment 4 | 0.35 | 0.5 | 0.5 | 0.6 | 0.5 | 0.10 | - | - | ＜0.015 | ＜0.01 |
| Comparative example 1 | 0.30 | 0.42 | 1.0 | 1.0 | 0.8 | 0.03 | 0.03 | - | ＜0.015 | ＜0.01 |
| Comparative example 2 | 0.30 | 0.42 | 0.5 | 1.0 | 0.85 | 0.03 | 0.03 | 0.03 | ＜0.015 | ＜0.01 |
Embodiment 2
According to chemical ingredients in the table 1 smelt, cast and rolling, then carry out the 1st modifier treatment, wherein, the Heating temperature before quenching is 1000 ℃, insulation 120min, spray quenching.Tempering temperature is 650 ℃, insulation 150min, the rear air cooling of coming out of the stove.Carry out the 2nd modifier treatment, wherein, the Heating temperature before quenching is 950 ℃, insulation 120min, spray quenching again.Tempering temperature is 710 ℃, insulation 150min, the rear air cooling of coming out of the stove.
Embodiment 3
According to the chemical ingredients in the table 1 smelt, cast and rolling, then carry out the 1st modifier treatment, wherein, the Heating temperature before quenching is 930 ℃, insulation 45min, spray quenching.Tempering temperature is 570 ℃, insulation 90min, the rear air cooling of coming out of the stove.Carry out the 2nd modifier treatment, wherein, the Heating temperature before quenching is 950 ℃, insulation 120min, spray quenching again.Tempering temperature is 710 ℃, insulation 150min, the rear air cooling of coming out of the stove.
Embodiment 4
According to the chemical ingredients in the table 1 smelt, cast and rolling, then carry out the 1st modifier treatment, wherein, the Heating temperature before quenching is 1000 ℃, insulation 120min, spray quenching.Tempering temperature is 650 ℃, insulation 150min, the rear air cooling of coming out of the stove.Carry out the 2nd modifier treatment, wherein, the Heating temperature before quenching is 850 ℃, insulation 45min, spray quenching again.Tempering temperature is 650 ℃, insulation 90min, the rear air cooling of coming out of the stove.
Comparative example 1
According to the chemical ingredients in the table 1 smelt, cast and rolling, then carry out modifier treatment, wherein, the Heating temperature before quenching is 930 ℃, insulation 45min, spray quenching.Tempering temperature is 700 ℃, insulation 90min, the rear air cooling of coming out of the stove.
Comparative example 2
According to the chemical ingredients in the table 1 smelt, cast and rolling, then carry out modifier treatment, wherein, the Heating temperature before quenching is 930 ℃, insulation 45min, spray quenching.Tempering temperature is 690 ℃, insulation 120min, the rear air cooling of coming out of the stove.
Fig. 1 contrasts for the grain fineness number tissue of the 125ksi steel grade sulfur resistant pipe that adopts the present invention and produce and traditional 125ksi steel grade sulfur resistant pipe.As seen from Figure 1, anti-sulphur pipe of the present invention has more evenly tiny grain structure, and grain fineness number has improved more than 3 grades.
Table 2 is mechanical property and the sulfur resistance contrast of the 125ksi steel grade sulfur resistant pipe that adopts the present invention and produce and traditional 125ksi steel grade sulfur resistant pipe.
The performance comparison of table 2 technique of the present invention and traditional technology
H: hour
Hydrogen sulfide corrosion resistance energy: press the A method of NACE TM0177 standard, in passing into the A solution of saturated hydrogen sulfide, apply 80%SMYS load and soak 720 hours not crackings.
By as seen from Table 2, although the intensity of the 125ksi steel grade sulfur resistant pipe that traditional material and thermal treatment process are produced has all reached the 125ksi grade of steel, because the metallographic structure of the 125 steel grade sulfur resistant pipes that traditional technology is produced is inhomogeneous, crystal grain is thicker, impelling strength is lower, and sulfur resistance is also undesirable; According to the present invention the high strength sulfur resisting tube material is carried out rational modified thermal treatment, can produce minimum nominal yield strength more than 125ksi and have good hydrogen sulfide corrosion resistance can tubing and casing.The high strength sulfur resisting casing pipe of producing can be widely used in deep-well, the ultra deep well probing mining operations of sulfur-bearing, has very wide application prospect.
Claims (4)
1. high strength sulfur resisting casing pipe, its chemical ingredients by weight percentage is:
C:0.25-0.35wt%, Si:0.1-0.5wt%, Mn:0.4-0.6wt%, Cr:0.1-0.6wt%, Mo:0.2-0.6wt%, V:0.03-0.15wt%, P＜0.015wt%, S＜0.010wt%, all the other are Fe and inevitable impurity element;
After being rolled into steel pipe, carry out twice modified thermal treatment;
In for the first time modified thermal treatment, the Heating temperature before quenching is 900 ℃-1000 ℃, insulation 45min-120min, spray quenching; Tempering temperature is 670 ℃-710 ℃, insulation 90min-150min, the rear air cooling of coming out of the stove;
In for the second time modified thermal treatment, the Heating temperature before quenching is 850 ℃-950 ℃, insulation 45min-120min, spray quenching; Tempering temperature is 650 ℃-710 ℃, insulation 90min-150min, the rear air cooling of coming out of the stove.
2. high strength sulfur resisting casing pipe as claimed in claim 1 is characterized in that, after the thermal treatment second time, carries out hot straightening being higher than 480 ℃.
3. high strength sulfur resisting casing pipe as claimed in claim 2 is characterized in that, after the thermal treatment second time, carries out hot straightening at 480-580 ℃.
4. such as each described high strength sulfur resisting casing pipe of claim 1～3, it is characterized in that the yield strength Rt0.65 of described high strength sulfur resisting casing pipe 〉=862MPa, tensile strength 〉=932MPa, unit elongation 〉=19%, impelling strength are vertical Akv 〉=90J, laterally Akv 〉=90J.
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| CN103243202A (en) * | 2013-04-16 | 2013-08-14 | 东营信盛机械有限公司 | Thermal treatment processing technology for transmission shaft of petroleum drilling and production equipment |
| CN104480278A (en) * | 2014-12-24 | 2015-04-01 | 江苏隆盛钻采机械制造有限公司 | Thermal processing process for oil casing pup joint |
| CN105063324B (en) * | 2015-09-08 | 2017-05-24 | 天津钢管集团股份有限公司 | Heat treatment method of high-strength hydrogen-sulfide-corrosion-resistant seamless steel tube for oil wells |
| CN105177434B (en) * | 2015-09-25 | 2017-06-20 | 天津钢管集团股份有限公司 | The manufacture method of 125ksi grade of steel sulfurated hydrogen stress etching-resisting oil well pipes |
| CN110616366B (en) * | 2018-06-20 | 2021-07-16 | 宝山钢铁股份有限公司 | 125ksi steel grade sulfur-resistant oil well pipe and manufacturing method thereof |
| CN113817898A (en) * | 2021-07-12 | 2021-12-21 | 承德建龙特殊钢有限公司 | Method for improving structure performance of chromium-molybdenum steel |
| CN115386808B (en) * | 2022-09-28 | 2023-05-30 | 延安嘉盛石油机械有限责任公司 | Corrosion-resistant oil casing and preparation method and application thereof |
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| CN1924068A (en) * | 2005-08-30 | 2007-03-07 | 宝山钢铁股份有限公司 | Oil well tube resisting stress corrosion of H2S and manufacture method thereof |
| CN1986843A (en) * | 2005-12-20 | 2007-06-27 | 渤海能克钻杆有限公司 | Heat treatment process of sulfur resistant drill pipe joint |
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| JP2000256783A (en) * | 1999-03-11 | 2000-09-19 | Sumitomo Metal Ind Ltd | High strength steel for oil well excellent in toughness and sulfide stress corrosion cracking resistance and its production |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1924068A (en) * | 2005-08-30 | 2007-03-07 | 宝山钢铁股份有限公司 | Oil well tube resisting stress corrosion of H2S and manufacture method thereof |
| CN1986843A (en) * | 2005-12-20 | 2007-06-27 | 渤海能克钻杆有限公司 | Heat treatment process of sulfur resistant drill pipe joint |
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