CN103469080A - 80ksi steel grade oil well pipe and manufacturing method thereof - Google Patents
80ksi steel grade oil well pipe and manufacturing method thereof Download PDFInfo
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- CN103469080A CN103469080A CN2013104007537A CN201310400753A CN103469080A CN 103469080 A CN103469080 A CN 103469080A CN 2013104007537 A CN2013104007537 A CN 2013104007537A CN 201310400753 A CN201310400753 A CN 201310400753A CN 103469080 A CN103469080 A CN 103469080A
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Abstract
The invention provides a 80ksi steel grade oil well pipe and a manufacturing method thereof. The 80ksi steel grade oil well pipe comprises the following chemical components in percentage by weight: 0.15%-0.19% of C, 0.2%-0.3% of Si, 1.20%-1.40% of Mn, not greater than 0.015% of P, not greater than 0.003% of S, 0.6%-0.9% of Cr, 0.01%-0.03% of Nb, 0.04%-0.06% of Ti and 0.08%-0.12% of Cu; RE is steel of 50-90 g/t. The manufacturing method comprises the following steps: determining final rolling temperature at 1170-1190 DEG C by adopting a casting billet cold charge mode; determining the pipe manufacturing heating temperature at 1200-1240 DEG C, and determining the finish rolling temperature at 1020-1050 DEG C; keeping the quenching temperature at 820-840 DEG C for 20-25 minutes, carrying out water quenching, and keeping the tempering temperature at 665-675 DEG C for 25-35 minutes. The 80ksi steel grade oil well pipe provided by the invention is low in manufacturing cost, is enhanced in SSC (Sulfide Stress Corrosion Cracking) resistant property by 95% according to an NACETM 0177-2006 test without cracking of YSMIN within 720 hours, achieves the yield strength of 560-619 MPa, the tensile strength of more than 620 MPa and 0 DEG C V-shaped notch sample charpy impact energy of more than 100 J and is especially suitable for cold areas and ocean environments.
Description
Technical field
The invention belongs to low alloy steel production technique field, relate in particular to a kind of hydrogen sulfide corrosion-resistant oil well pipe and manufacture method thereof of 80ksi intensity rank.
Background technology
A large amount of exploitations of oil in recent years force the new oil production technology such as many domestic and international Oilfield using secondary oil recoverys, tertiary oil recovery water filling, have brought 55～80ksi intensity rank oil well pipe to suffer the new problem of hydrogen sulfide corrosion.Under such water surrounding, oil well pipe easily produces sulphide stress corrosion crackle (SSC), so that oil well pipe damages, oil well is scrapped, and requires oil well pipe tubing to have excellent hydrogen sulfide corrosion-resistant performance and mechanical property.Angle from the oil well pipe material, common API oil well pipe obviously can not meet actual operation requirements, and the sulfurated hydrogen stress etching-resisting oil well pipe manufacturing cost of having developed at present is higher, therefore and yield strength suitable in the urgent need to cost of development is higher than 552MPa(80ksi) and have the oil well pipe of excellent sulfurated hydrogen stress etching-resisting performance concurrently.
1) Chinese patent that publication number is CN102747279A, disclose tubing and casing and manufacture method thereof that a kind of intensity rank 80ksi anti-H 2 S stress corrosion ftractures.Its alloying characteristics are to add the B of 10～30ppm and 0.3～0.6% Mn, and resist H 2 S stress corrosion through modifier treatment, but this invention does not provide ballistic work and these two performance index of hardness.
2) Japanese Patent JP2000063994 discloses a kind of sulfurated hydrogen stress etching-resisting steel alloy oil well pipe of 80ksi grade of steel, the key point of its alloy designs is to contain: Mn 0.30%-1.50%, Cr 3.0%-9.0%, in addition, the Ni of also interpolation maximum 2.5%, 2.0% Mo, 1.5% Cu, 2.0% the noble metals such as W.This invention cost of alloy is high, and the industrial implementation difficulty is larger.
3) Japanese Patent JP2001059136 discloses a kind of sulfurated hydrogen stress etching-resisting steel alloy oil well pipe of 80ksi grade of steel, the key point of its alloy designs is to contain: B 0.0001%-0.0020%, Cr 1.0%-9.0%, and, also add the noble metals such as more Ni, Mo.Therefore, the problem that this invention product exists is high cost, and the industrial implementation difficulty is large.
The exploitation of the anticorrosive Series Oil well casing of document Baosteel, disclose Baosteel 80ksi grade of steel hydrogen sulfide corrosion-resistant oil well pipe BG80S(S), but the just introduction of the property summarized, and the alloy designs of unexposed product and manufacturing process.
Exploitation and the application of the anticorrosive Series Oil well casing of document Baosteel, mentioned Baosteel 80ksi grade of steel hydrogen sulfide corrosion-resistant oil well pipe, but the also just introduction of the property summarized, and the alloy designs of unexposed product and manufacturing process and parameter.
Summary of the invention
Purpose of the present invention aims to provide a kind ofly can produce hardness low with lower manufacturing cost, impact property and the excellent performance of anti-SSC, hydrogen sulfide corrosion-resistant oil well pipe and the manufacture method thereof of the 80ksi intensity rank that range of application is more wide.
For this reason, the solution that the present invention takes is:
A kind of 80ksi steel grade oil well casing, it is characterized in that, chemical composition Wt% is: C 0.15%-0.19%, Si 0.2%-0.3%, Mn 1.20%-1.40%, P≤0.015%, S≤0.003%, Cr0.6%-0.9%, Nb0.01%-0.03%, Ti0.04%-0.06%, Cu0.08%-0.12%, the RE addition is 50～90g/t steel, and surplus is Fe and inevitable impurity; Wherein limit N<0.005%, O<0.002%, H<0.0001%, and A, B, C, D class are slightly that inclusion is respectively lower than 1.5 grades.
A kind of manufacture method of 80ksi steel grade oil well casing, its concrete grammar is:
1, adopt the round base manufacturing process of converter smelting+billet continuous casting+hot rolling;
Adopt strand cold charge stove mode when 2, base is justified in rolling, 1170～1190 ℃ of finishing temperatures;
3,1200～1240 ℃ of Heating temperatures during tubulation, 1020～1050 ℃ of tube rolling finishing temperatures;
4, Steel Pipe Heat is processed, and steel pipe is heated to 820～840 ℃, is incubated 20～25min, and shrend, then be heated to 665～675 ℃ by steel pipe, is incubated 25～35min, and then air cooling or water-cooled are to room temperature.
Effect and the design of each principal element be the reasons are as follows:
C: the hardening capacity that improves steel, and form carbide with metallic element, to obtain enough intensity, content is too low needs to increase the amount of alloying element to make up reducing of its intensity contribution, too high crystal grain and the carbide that is unfavorable for obtaining reduced size of content, to achieve the object of the present invention, limiting the C content range is 0.15%-0.19%.
Si: effect plays on the one hand desoxydatoin, and solid solution strengthening effect in ferrite on the other hand plays certain contribution to the intensity of steel, but the too high oxidization burning loss that will increase heat-treated steel of content is inclined to, and Si content of the present invention is limited to 0.2%-0.3%.
Mn: effect plays desoxydatoin on the one hand, plays on the other hand solution strengthening effect, and improves the hardening capacity of steel, the refinement of grain-size while also helping controlled rolling and controlled cooling.But can increase the segregation tendency of steel during the manganese too high levels, consider, invention limits the content range 1.20%-1.40% of Mn.
Cr: effect forms fine and close oxide film on the oil well pipe surface on the one hand, stops the infiltration of H, can improve the anti-SSC performance of steel pipe, on the other hand, improves hardening capacity, improves the intensity of steel.But when content surpasses 1.0%, aforementioned effect is saturated, therefore the present invention limits the content range 0.6%-0.9% of Cr.
Cu: effect forms protective membrane on the oil well pipe surface on the one hand, stops the infiltration of H, can improve the anti-SSC performance of steel pipe, improve on the other hand the hardening capacity of steel, but too high levels can reduce the thermoplasticity of steel, and the present invention limits the content range 0.08%-0.12% of Cu.
Ti: effect is mainly the grain growth formed in compound restriction heating and hot procedure, obtains tiny grain structure, improves anti-SSC performance and intensity, and the too high above-mentioned effect of content is saturated, therefore the present invention limits the content range 0.04%-0.06% of Ti.
Nb: the effect of strong crystal grain thinning tissue is arranged in the steel of implementing cooling controlling and rolling controlling process, can improve intensity and improve anti-SSC performance.Too high levels acts on also saturated, and the present invention limits the content range 0.01%-0.03% of Nb.
RE: effect improves the form of the inclusiones such as MnS on the one hand, suppresses on the one hand the segregation of the harmful elements such as P, S at crystal boundary.Therefore, can improve the anti-SSC performance of steel, but add, resist at most the SSC performance and have a negative impact, the addition that the present invention limits RE is 50 ~ 90g/t steel, and preferentially selects Ce.
P, S, O, N, H are the impurity element in steel, and content is more low better, but too low requirement will increase the manufacturing cost of product, therefore the present invention limits P≤0.015%, S≤0.003%, N<0.005%, O<0.002%, H<0.0001%.
Beneficial effect of the present invention is:
1, the present invention does not add the precious metals such as W, Mo, Ni, implements the alloying routes such as Cr, Cu, RE, therefore can greatly reduce manufacturing cost, improves the competitiveness of product in market.
2, oil well pipe excellent performance of the present invention, anti-SSC performance reaches 720 hours by NACE TM0177-2006 test loading 95%YSMIN and does not ftracture; Yield strength is 560～610MPa, tensile strength>620MPa,
HRC<22HRC, 0 ℃ of v-notch sample Charpy-V impact power>100J, reach the 80ksi level fully, solved 55～80ksi intensity rank oil well pipe and suffered the problem of H 2 S stress corrosion cracking.
3, product low-temperature impact toughness and hardness number excellence, can be used under the environment for cold district and ocean, and range of application is more wide.
4, the present invention adopts the operational path that converter smelting+billet continuous casting combines with circle base, steel pipe rolling, the blank good compactness, process for manufacturing seamless steel tubes can avoid product due to weld seam and welded bonds problem, the problem includes: increase application risk problem.
With the Japanese Patent of publication number JP2000063994 and JP2001059136, compare, manufacturing cost is with the obvious advantage.With the Chinese patent that publication number is CN102747279A, compare, oil well pipe hardness of the present invention is low, and impact property and anti-SSC performance are more excellent.
Embodiment
Technical process of the present invention is converter smelting-billet continuous casting-circle base rolling-seamless tubulation-thermal treatment.
It is main component that alloy designs be take C, Mn, Ti, Cr, Cu, Nb, and adds RE, utilizes interaction between alloying element, in cost of alloy with between the effect of bringing into play to greatest extent element and resist SSC performance and mechanical property, finds trim point.The chemical composition wt% of embodiment steel is in Table 1.
The chemical composition wt% of table 1 embodiment is containing scale
| Embodiment | C | Si | Mn | P | S | Cr | Nb | Ti | Fe |
| 1 | 0.15 | 0.24 | 1.28 | 0.011 | 0.0022 | 0.7 | 0.028 | 0.042 | Surplus |
| 2 | 0.17 | 0.29 | 1.32 | 0.010 | 0.0014 | 0.6 | 0.02 | 0.047 | Surplus |
| 3 | 0.18 | 0.25 | 1.33 | 0.009 | 0.0027 | 0.7 | 0.019 | 0.06 | Surplus |
| 4 | 0.16 | 0.20 | 1.21 | 0.014 | 0.0010 | 0.9 | 0.024 | 0.054 | Surplus |
| 5 | 0.19 | 0.27 | 1.39 | 0.012 | 0.0026 | 0.7 | 0.013 | 0.043 | Surplus |
| 6 | 0.17 | 0.22 | 1.25 | 0.009 | 0.0023 | 0.8 | 0.012 | 0.05 | Surplus |
Annotate: the RE addition is 50～90g/t steel.Control N<0.005%, O<0.002%, H<0.0001%, A, B, C, D class are slightly that inclusion is respectively lower than 1.5 grades.Embodiment rolling technology system is in Table 2.
Table 2 embodiment rolling technology system
The performance index assay that table 3 is the embodiment steel.
The performance index assay of table 3 embodiment steel pipe
Claims (2)
1. a 80ksi steel grade oil well casing, it is characterized in that, chemical composition Wt% is: C 0.15%-0.19%, Si 0.2%-0.3%, Mn 1.20%-1.40%, P≤0.015%, S≤0.003%, Cr0.6%-0.9%, Nb0.01%-0.03%, Ti0.04%-0.06%, Cu0.08%-0.12%, the RE addition is 50～90g/t steel, and surplus is Fe and inevitable impurity; Wherein limit N<0.005%, O<0.002%, H<0.0001%, and A, B, C, D class are slightly that inclusion is respectively lower than 1.5 grades.
2. the manufacture method of the described 80ksi steel grade oil of claim 1 well casing, is characterized in that, concrete grammar is:
1) adopt the round base manufacturing process of converter smelting+billet continuous casting+hot rolling;
Adopt strand cold charge stove mode when 2) base is justified in rolling, 1170～1190 ℃ of finishing temperatures;
3) 1200～1240 ℃ of Heating temperatures during tubulation, 1020～1050 ℃ of tube rolling finishing temperatures;
4) Steel Pipe Heat is processed, and steel pipe is heated to 820～840 ℃, is incubated 20～25min, and shrend, then be heated to 665～675 ℃ by steel pipe, is incubated 25～35min, and then air cooling or water-cooled are to room temperature.
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| CN201310400753.7A CN103469080B (en) | 2013-09-06 | 2013-09-06 | A kind of manufacture method of 80ksi steel grade oil well casing |
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| CN201310400753.7A CN103469080B (en) | 2013-09-06 | 2013-09-06 | A kind of manufacture method of 80ksi steel grade oil well casing |
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| CN103469080B CN103469080B (en) | 2016-03-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106319371A (en) * | 2015-06-16 | 2017-01-11 | 鞍钢股份有限公司 | 90ksi steel-grade oil well pipe with good SSC resistance and manufacturing method thereof |
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| CN1487112A (en) * | 2002-09-30 | 2004-04-07 | 宝山钢铁股份有限公司 | Low alloy steel resisting CO2 and H2S corrosion |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106319371A (en) * | 2015-06-16 | 2017-01-11 | 鞍钢股份有限公司 | 90ksi steel-grade oil well pipe with good SSC resistance and manufacturing method thereof |
| CN106319371B (en) * | 2015-06-16 | 2018-06-26 | 鞍钢股份有限公司 | The 90ksi grade of steels oil well pipe and its manufacturing method of anti-SSC function admirables |
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| CN103469080B (en) | 2016-03-02 |
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