CN107604247A - Superhigh intensity SEW petroleum casing pipes hot continuous rolling coil of strip and its production method - Google Patents
Superhigh intensity SEW petroleum casing pipes hot continuous rolling coil of strip and its production method Download PDFInfo
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- CN107604247A CN107604247A CN201710812685.3A CN201710812685A CN107604247A CN 107604247 A CN107604247 A CN 107604247A CN 201710812685 A CN201710812685 A CN 201710812685A CN 107604247 A CN107604247 A CN 107604247A
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Abstract
The invention discloses a kind of superhigh intensity SEW petroleum casing pipes hot continuous rolling coil of strip and its production method, belong to Rolling production technical field.The very excellent superhigh intensity SEW petroleum casing pipe hot continuous rolling coil of strips of a kind of welding performance and mechanical performance and its production method are provided.Described hot continuous rolling coil of strip is the continuous casting and rolling coil of strip for including following weight parts chemical constituent, described chemical constituent is at least by the control of Cr contents between 0.30 0.60%, V content is controlled between 0.040 0.060%, Ti contents are controlled between 0.008 0.019%, and are increased and controlled Mo content between 0.20 0.40%.Described production method first passes through the crystal grain thinning roughing of 57 passages, then the finish rolling by least four passage using continuous casting steel billet as initial blank under temperature control heating condition, finally carries out air cooling and batches to complete the production and processing work of the hot continuous rolling coil of strip.
Description
Technical field
The present invention relates to a kind of hot continuous rolling coil of strip, more particularly, to a kind of superhigh intensity SEW petroleum casing pipes hot continuous rolling steel
Volume, belongs to Rolling production technical field.The invention further relates to a kind of production method for being used to roll the hot continuous rolling coil of strip.
Background technology
Petroleum casing pipe is the important piping material used in oil, gas exploitation course, is in oilfield drilling operation
Essential construction material.Particularly in recent years, the probing of deep-well and ultradeep well proposes higher to the performance of petroleum casing pipe
Requirement, the demand of high collapse strength is increasing, influences that the factor of collapse resistance is a lot, and the surrender of its middle sleeve is strong
Degree is its critically important factor, with the increase of sleeve pipe yield strength, the increase of its collapsoing strength.High collapse strength was mainly adopted in the past
With seamless pipe, but the shortcomings of wall thickness deviation is big, performance is uneven, anti-chance ability is low, perforation cracking set damage is fast, serious shadow be present
The quality and benefits of oil well probing and exploitation is rung.
In recent years, high anti-jamming straight welding oil annular tube research and production it is a lot.Application No. 201110427453.9
In a kind of high anti-jamming SEW petroleum casing pipes and its manufacture method that patent document discloses, its chemical composition is C：0.25%~
0.33%, Si：0.19%~0.28%, Mn：1.10%~1.30%, P≤0.020%, S≤0.008%, the patent only include
The production technology of petroleum casing pipe, without the production technology of oil casing pipe steel volume, and the yield strength of final steel pipe is 720-
760MPa, tensile strength are relatively low in more than 820MPa, its yield strength.The patent document of Application No. 200910018524.2 is public
In a kind of N80, P110, L80 grade of steel vertical masonry joint straight welding oil annular tube steel and the sleeve pipe manufacture opened, its chemical composition is C：
0.10%~0.28%, Si：0.12%~0.25%, Mn：1.10%~1.60%, P：0.03~0.14%, S：0.002~
0.03%, Cr：0.20%~0.70%, Nb：0.07%~0.17%, V：0.05%~0.15%, Ti：0.10~0.22%,
The patent middle sleeve highest yield strength is in 850MPa or so.It is straight that Application No. 201310468738.6 discloses a kind of P110 levels
Stitch in petroleum casing pipe and its manufacture method, its chemical composition is C：0.24%~0.28%, Si：0.15%~0.30%, Mn：
1.25%~1.50%, P≤0.020%, S≤0.008%, V：0.05%~0.08%, Ti：0.010~0.30%, the patent
The yield strength of coils of hot-rolled steel brings very big difficulty, the yield strength of its sleeve pipe to follow-up welded tube in more than 570MPa
Between 780MPa-850MPa, tensile strength is between 880-970MPa.
Based on drawbacks described above present in prior art, therefore, the superhigh intensity straight welding petroleum set of function admirable is developed
Pipe turns into the task of top priority, and to saving cost for oil production, improving oil exploitation level has profound significance.Develop superhigh intensity
SEW petroleum casing pipes hot continuous rolling coil of strip, meets the needs of petroleum industry deep-well and ultradeep well probing and exploitation, just this is for ability
Field technique personnel are badly in need of the technical problem solved.
The content of the invention
The technical problems to be solved by the invention are：There is provided a kind of welding performance and mechanical performance very excellent superelevation
Strength S EW petroleum casing pipes hot continuous rolling coil of strip, the present invention also provide a kind of production method for being used to produce the hot continuous rolling coil of strip.
Technical scheme is used by solve above-mentioned technical problem：A kind of superhigh intensity SEW petroleum casing pipe hot continuous rollings
Coil of strip, described hot continuous rolling coil of strip are the continuous casting and rolling coil of strip for including following weight parts chemical constituent,
Described chemical constituent is C：0.22~0.32%, Si：0.10~0.30%, Mn：1.10~1.40%, Cr：
0.30~0.60%, Mo：0.20~0.40%, V：0.040~0.060%, P：≤ 0.020%, S：≤ 0.010%, Ti：
0.008~0.019%., remaining is Fe and inevitable impurity,
The initial yield intensity of the continuous casting and rolling coil of strip is 480~540MPa, initial tensile strength is 640~
740MPa；Yield strength 900MPa-960MPa after the continuous casting and rolling coil of strip modifier treatment, tensile strength 1000-
1090MPa。
It is further that described chemical constituent is C：0.24~0.30%, Si：0.10~0.30%, Mn：1.20~
1.40%, Cr：0.40~0.50%, Mo：0.20~0.30%, V：0.040~0.060%, P：≤ 0.018%, S：≤
0.005%, Ti：0.010~0.017%, remaining is Fe and inevitable impurity.
A kind of production method for the hot continuous rolling coil of strip, described production method using continuous casting steel billet as initial blank,
The crystal grain thinning roughing of 5-7 passage, then the finish rolling by least four passage are first passed through under temperature control heating condition, it is most laggard
Row air cooling is batched to complete the production and processing work of the hot continuous rolling coil of strip,
Wherein, in the crystal grain thinning rough rolling process of each passage, the deflection of each passage steel billet is necessary >=and 18%.
It is further that, when carrying out the crystal grain thinning roughing of each passage, the temperature control of heating is 1180~1220
℃。
It is further that the thickness of initial continuous casting steel billet is between 200~250 ㎜.
It is further that, when carrying out finish rolling, the finish rolling of each passage is once completed by mm finishing mill unit.
It is further that inlet temperature during finish rolling is controlled between 970~1020 DEG C, finishing temperature scope is 850~
900℃。
It is further that the slab after crystal grain thinning roughing is introduced into Coil Box progress base head base tail exchange and batched,
Then uncoiling enters the progress temperature control finish rolling of finish rolling area again.
The beneficial effects of the invention are as follows：The application is using existing high anti-jamming straight welding oil annular tube chemical composition as base
Plinth, by adjusting Cr, V, Ti, Mn therein limit content, chemical element Nb is reduced, increase and strictly control chemical element Mo
Component content；And in hot continuous rolling production process, using continuous casting steel billet as initial blank, 5- is first passed through under temperature control heating condition
The crystal grain thinning roughing of 7 passages, then the finish rolling by least four passage, finally carry out air cooling and batch to complete the heat even
The production and processing work of rolled steel coils.Especially in the crystal grain thinning rough rolling process of each passage, the change of each passage steel billet
Shape amount must assure that >=18%.By the adjustment and control of chemical composition, then it is aided with crystal grain thinning roughing operation temperature again
Control, the control of rolling reduction, reach the welding performance and mechanical performance for improving the hot continuous rolling coil of strip that the application provides
Purpose, you can to ensure the initial yield intensity of continuous casting and rolling coil of strip as 480~540MPa, initial tensile strength is 640~
740MPa is excellent to ensure its welding performance, and and can ensures the finished product after the completion of welding, passes through the yield strength after modifier treatment
Between 900MPa~960MPa, very excellent mechanical performance of the tensile strength between 1000~1090MPa.
Brief description of the drawings
Fig. 1 is the metallographic structure figure of superhigh intensity SEW petroleum casing pipes hot continuous rolling coil of strip finished product of the present invention.
Embodiment
In order to solve above-mentioned technical problem present in prior art, a kind of welding performance and mechanicalness provided by the invention
Superhigh intensity SEW petroleum casing pipe hot continuous rolling coil of strips that can be very excellent, and a kind of be used to produce the hot continuous rolling coil of strip
Production method.Described hot continuous rolling coil of strip is the continuous casting and rolling coil of strip for including following weight parts chemical constituent,
Described chemical constituent is C：0.22~0.32%, Si：0.10~0.30%, Mn：1.10~1.40%, Cr：
0.30~0.60%, Mo：0.20~0.40%, V：0.040~0.060%, P：≤ 0.020%, S：≤ 0.010%, Ti：
0.008~0.019%., remaining is Fe and inevitable impurity, and the initial yield intensity of the continuous casting and rolling coil of strip is 480
~540MPa, initial tensile strength are 640~740MPa；Yield strength after the continuous casting and rolling coil of strip modifier treatment
900MPa-960MPa, tensile strength 1000-1090MPa.Described production method is using continuous casting steel billet as initial blank, in temperature control
The crystal grain thinning roughing of 5-7 passage, then the finish rolling by least four passage are first passed through under heating condition, finally carries out air cooling
Batch to complete the production and processing work of the hot continuous rolling coil of strip, wherein, in the crystal grain thinning rough rolling process of each passage, often
The deflection of one passage steel billet is necessary >=and 18%.The application using existing high anti-jamming straight welding oil annular tube chemical composition as
Basis, by adjusting Cr, V, Ti, Mn therein limit content, chemical element Nb is reduced, increase and strictly control chemical element
Mo component content；And in hot continuous rolling production process, using continuous casting steel billet as initial blank, first passed through under temperature control heating condition
The crystal grain thinning roughing of 5-7 passage, then the finish rolling by least four passage, finally carry out air cooling and batch to complete the heat
The production and processing work of tandem rolling coil of strip.Especially in the crystal grain thinning rough rolling process of each passage, each passage steel billet
Deflection must assure that >=18%.By the adjustment and control of chemical composition, then it is aided with crystal grain thinning roughing operation temperature again
Control, the control of rolling reduction, reach improve the application provide hot continuous rolling coil of strip welding performance and mechanical performance
Purpose, you can to ensure the initial yield intensity of continuous casting and rolling coil of strip as 480~540MPa, initial tensile strength is 640~
740MPa is excellent to ensure its welding performance, and and can ensures the finished product after the completion of welding, passes through the yield strength after modifier treatment
Between 900MPa-960MPa, very excellent mechanical performance of the tensile strength between 1000-1090MPa.As shown in figure 1,
It is the metallographic structure figure of the application superhigh intensity SEW petroleum casing pipe hot continuous rolling coil of strip finished products.
In above-mentioned embodiment, in order to improve the welding performance and machinery of herein described hot continuous rolling coil of strip to greatest extent
Performance, this application provides the component that a kind of each chemical composition content is more strict, i.e., described chemical constituent is C：0.24
~0.30%, Si：0.10-0.30%, Mn：1.20~1.40%, Cr：0.40~0.50%, Mo：0.20~0.30%, V：
0.040~0.060%, P：≤ 0.018%, S：≤ 0.005%, Ti：0.010~0.017%, remaining is for Fe and inevitably
Impurity.And further the corresponding process during Rolling Production is adjusted, that is, carrying out the crystal grain thinning of each passage
During roughing, the temperature control of heating is at 1180~1220 DEG C；The thickness of initial continuous casting steel billet is between 200~250 ㎜；Carry out
During finish rolling, the finish rolling of each passage is once completed by mm finishing mill unit；And inlet temperature during finish rolling is controlled 970~1020
Between DEG C, finishing temperature scope is 850~900 DEG C；Slab after crystal grain thinning roughing is introduced into Coil Box and carries out base head
Base tail is exchanged and batched, and then uncoiling enters the progress temperature control finish rolling of finish rolling area again.
The application makes full use of effect of the trace alloying element in finished steel plate, i.e., by the control to constituent
The member such as C, Si, Mn, Cr, Mo, V and Ti is made full use of to control the property to finished steel plate as alloying component rather than impurity content
Energy adjustment effect reaches the purpose for improving finished steel plate performance.Effect of the wherein various trace alloying elements in finished steel plate is such as
Under：
C：For carbide former, intensity can be improved, but the too high easily formation banded structure of C content, this patent are being controlled
Roll the cold process aspect of control and carried out best match, effectively inhibit banded structure to be formed.
Si：The yield strength of steel can be improved by being solid-solution in ferrite.It is too high to deteriorate processing and toughness, and surface oxidation
Iron sheet is " red rust ", and it is clean to be not easy de-scaling.
Mn：For austenite former, the quenching degree of steel can be improved, solution strengthening effect is played in steel, improves steel
Intensity, microstructure segregation is easily formed with too high, influences impact and block hammer performance.
Cr：It is the strong element for improving quenching degree, is a kind of strong precipitate formation element, during subsequent heat treatment, can expands
Technology for Heating Processing window, form precipitate, hence it is evident that improve steel strength.
Mo：The stability of austenite is improved, in follow-up heat treatment process, improves the stability of Heat Treatment Control technique
(expanding Technology for Heating Processing window)；By the precipitation with V and Ti, steel strength is improved, and Mo is obvious to precipitated phase thinning effect,
The curing of precipitated phase can be suppressed and grown up, control below 10nm precipitation Phase Proportion more than 70%.
V：Typical precipitation strength element, especially subsequently by the petroleum casing pipe steel grade of Technology for Heating Processing, heat treated
Secondary precipitation in journey, steel strength can be significantly improved, and reduce the strength difference of welding heat affected zone and mother metal.
Ti：Typical precipitation strength element, in this patent, the main precipitation for utilizing TiN, suppress in follow-up welding process
The crystal grain of heat affected area is grown up, and remaining Ti is combined with C, its precipitation strength effect, improves steel strength.
Embodiment
The present invention the technological process of production be：Desulfurizing iron → converter smelting top-bottom blowing → deoxidation, alloying → LF electricity
Heating → RH application of vacuum → hello calcium line → continuous casting → heating of plate blank → high-pressure water descaling → roughing → Coil Box batches → finish rolling
→ section cooling → batches → packaging and storage.
Superhigh intensity SEW petroleum casing pipes hot continuous rolling coil of strip, after conventional converter smelting, continuous casting, the chemistry of finished steel
Composition is：C：0.22~0.32%, Si：0.10~0.30%, Mn：1.10~1.40%, Cr：0.30~0.60%, Mo：0.20
~0.40%, V：0.040~0.060%, P：≤ 0.020%, S：≤ 0.010%Ti：0.008~0.019%., remaining is Fe
With inevitable impurity.
Slab obtained by continuous casting is heated to 1180~1220 DEG C of insulation roughing, according to the difference of finished product thickness, 200~
Slab thick 250mm passes through 5 passages or 7 passage roughing, and every time deflection is necessary >=and 18%.
Steel billet after roughing then carries out Coil Box and batched, and the Coil Box for example can be mandrelless transform hot rolling
Case.Base exchanges end to end among being realized in the Coil Box, to ensure that the elongated temperature of steel billet is uniform；Remove secondary oxidation simultaneously
Iron sheet is bright and clean to ensure steel billet plate face.
Middle base carries out displacement uncoiling after being batched through Coil Box, and finish rolling, entry temperature at finishing are carried out into finish rolling area
1000~1040 DEG C of control, finishing temperature scope are 850~900 DEG C, are cooled down after finish rolling using air cooling mode.
Here is 5 embodiments of the present invention, and table 1 is the chemical composition of 5 embodiments of the present invention, and table 2 is Hot-roller
Skill controlling value, table 3 are the mechanical properties of coil of strip.
The chemical composition of the embodiment of table 1
| Embodiment | C | Si | Mn | Cr | Mo | V | P | S | Ti |
| 1 | 0.26 | 0.28 | 1.33 | 0.48 | 0.29 | 0.05 | 0.013 | 0.002 | 0.016 |
| 2 | 0.25 | 0.27 | 1.33 | 0.47 | 0.29 | 0.05 | 0.012 | 0.002 | 0.012 |
| 3 | 0.26 | 0.28 | 1.3 | 0.45 | 0.28 | 0.06 | 0.014 | 0.002 | 0.015 |
| 4 | 0.24 | 0.25 | 1.29 | 0.46 | 0.28 | 0.05 | 0.012 | 0.003 | 0.014 |
| 5 | 0.27 | 0.26 | 1.32 | 0.47 | 0.26 | 0.04 | 0.013 | 0.003 | 0.016 |
The hot rolling technology controlling value of the embodiment of table 2
| Embodiment | Tapping temperature/DEG C | Workpiece thickness/mm | Start rolling temperature/DEG C | Final rolling temperature/DEG C |
| 1 | 1205 | 42 | 1015 | 887 |
| 2 | 1207 | 42 | 1012 | 880 |
| 3 | 1215 | 42 | 1021 | 890 |
| 4 | 1210 | 42 | 1022 | 885 |
| 5 | 1206 | 42 | 1015 | 878 |
The mechanical property of the coil of strip of the embodiment of table 3
| Embodiment | Yield strength (ReL) MPa | Tensile strength (Rm) MPa | Elongation percentage (A) % | Clod wash B=35, α=180 °, d=a |
| 1 | 487 | 742 | 31.0 | Close |
| 2 | 529 | 797 | 29.5 | Close |
| 3 | 528 | 775 | 27.5 | Close |
| 4 | 522 | 760 | 31.0 | Close |
| 5 | 512 | 745 | 29.0 | Close |
Claims (8)
- A kind of 1. superhigh intensity SEW petroleum casing pipes hot continuous rolling coil of strip, it is characterised in that：Described hot continuous rolling coil of strip is under including The continuous casting and rolling coil of strip of parts by weight chemical constituent is stated,Described chemical constituent is C：0.22~0.32%, Si：0.10~0.30%, Mn：1.10~1.40%, Cr：0.30~ 0.60%, Mo：0.20~0.40%, V：0.040~0.060%, P：≤ 0.020%, S：≤ 0.010%, Ti：0.008~ 0.019%., remaining is Fe and inevitable impurity,The initial yield intensity of the continuous casting and rolling coil of strip is 480~540MPa, and initial tensile strength is 640~740MPa；Institute State yield strength 900MPa~960MPa after continuous casting and rolling coil of strip modifier treatment, 1000~1090MPa of tensile strength.
- 2. superhigh intensity SEW petroleum casing pipes hot continuous rolling coil of strip according to claim 1, it is characterised in that：Described change Component is C：0.24~0.30%, Si：0.10~0.30%, Mn：1.20~1.40%, Cr：0.40~0.50%, Mo： 0.20~0.30%, V：0.040~0.060%, P：≤ 0.018%, S：≤ 0.005%, Ti：0.010~0.017%, remaining For Fe and inevitable impurity.
- A kind of 3. production method for the hot continuous rolling coil of strip of claim 1 or 2, it is characterised in that：Described production method Using continuous casting steel billet as initial blank, the crystal grain thinning roughing of 5-7 passage is first passed through under temperature control heating condition, then by least The finish rolling of 4 passages, finally carry out air cooling and batch to complete the production and processing work of the hot continuous rolling coil of strip,Wherein, in the crystal grain thinning rough rolling process of each passage, the deflection of each passage steel billet is necessary >=and 18%.
- 4. production method according to claim 3, it is characterised in that：When carrying out the crystal grain thinning roughing of each passage, The temperature control of heating is at 1180~1220 DEG C.
- 5. production method according to claim 3, it is characterised in that：The thickness of initial continuous casting steel billet 200~250 ㎜ it Between.
- 6. production method according to claim 3, it is characterised in that：When carrying out finish rolling, the finish rolling of each passage passes through essence Milling train group is once completed.
- 7. production method according to claim 6, it is characterised in that：Inlet temperature during finish rolling is controlled 970~1020 Between DEG C, finishing temperature scope is 850~900 DEG C.
- 8. production method according to claim 3, it is characterised in that：Slab after crystal grain thinning roughing is introduced into heat Volume case carries out the exchange of base head base tail and batched, and then uncoiling enters the progress temperature control finish rolling of finish rolling area again.
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| CN201710812685.3A CN107604247A (en) | 2017-09-11 | 2017-09-11 | Superhigh intensity SEW petroleum casing pipes hot continuous rolling coil of strip and its production method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112522607A (en) * | 2020-11-17 | 2021-03-19 | 马鞍山钢铁股份有限公司 | Q125 steel grade SEW petroleum casing pipe and manufacturing method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101798654A (en) * | 2010-04-09 | 2010-08-11 | 中国石油天然气集团公司 | Steel used for straight seam electric resistance welding petroleum casing and casing manufacturing method |
| CN104109805A (en) * | 2014-07-25 | 2014-10-22 | 攀钢集团西昌钢钒有限公司 | Steel strip for oil casing and production method of steel strip for oil casing |
-
2017
- 2017-09-11 CN CN201710812685.3A patent/CN107604247A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101798654A (en) * | 2010-04-09 | 2010-08-11 | 中国石油天然气集团公司 | Steel used for straight seam electric resistance welding petroleum casing and casing manufacturing method |
| CN104109805A (en) * | 2014-07-25 | 2014-10-22 | 攀钢集团西昌钢钒有限公司 | Steel strip for oil casing and production method of steel strip for oil casing |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112522607A (en) * | 2020-11-17 | 2021-03-19 | 马鞍山钢铁股份有限公司 | Q125 steel grade SEW petroleum casing pipe and manufacturing method thereof |
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Application publication date: 20180119 |