CN104451431A - High-performance marine riser board and production method - Google Patents
High-performance marine riser board and production method Download PDFInfo
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- CN104451431A CN104451431A CN201410666155.9A CN201410666155A CN104451431A CN 104451431 A CN104451431 A CN 104451431A CN 201410666155 A CN201410666155 A CN 201410666155A CN 104451431 A CN104451431 A CN 104451431A
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Abstract
The invention provides a high-performance marine riser board and a production method, and belongs to the technical field of petroleum tubes. The marine riser board comprises the following components: 0.05-0.10wt% of C, 0.10-0.30wt% of Si, 0.4-1.0wt% of Mn, 0.02-0.05wt% of Nb, 0.10-0.30wt% of Mo, 0.5-2.0wt% of Ni, 0.5-1.0wt% of Cr, 0.01-0.015wt% of Ti, 1.0-2.0wt% of Cu, not larger than 0.010wt% of P, not larger than 0.001wt% of S, not larger than 0.004wt% of N, not larger than 0.0015wt% of O2 and the balance of Fe and inevitable impurities. The process is characterized in that the heating temperature of a casting blank is 1160-1220 DEG C, and the heating time is 2-6 hours; two-stage controlled rolling is carried out, the final rolling temperature is 780-860 DEG C, the cooling speed is not smaller than 5 DEG C/s, the final cooling temperature is 450-550 DEG C, the quenching temperature is 700-850 DEG C, the tempering temperature is 600-660 DEG C, and the heat preservation time is 0.5-2 hours; and a steel plate is air-cooled after being discharged from a furnace. The high-performance marine riser board has the advantages of high strength, high toughness, excellent fatigue resistance and good longitudinal plastic deformation capacity, and can be used for manufacturing drilling risers used in deep sea severe environments.
Description
Technical field
The invention belongs to oil country tubular goods technical field, particularly relate to a kind of high-performance marine riser sheet material and production method, especially not only there is excellent anti-fatigue property but also had high-strength and high ductility marine riser sheet material and the production method thereof of good longitudinal plastic deformation ability concurrently, and can be used for manufacturing the extremely strict deep sea drilling marine riser production field of performance requriements.
Background technology
Marine oil and gas accounts for 70% of Global Oil Sweet natural gas total amount.Along with the exhaustion of land oil Sweet natural gas, hydrocarbon resources exploitation is especially area, deep-sea extension to ocean.China is ocean big country, explored offshore petroleum resources about 24,000,000,000 tons, natural gas source 14 tcm.Ocean plays more and more important role because of its huge energy treasure-house in International Politics and economy, has become the main battle ground obtaining hydrocarbon resources.China's marine oil and gas recovery percent is relatively low, and especially deep-sea oil gas development technique and equipment far lag behind advanced country in the world, lacks necessary deep-sea oil gas resource probing, exploitation and produces equipment.Therefore, accelerate the construction of marine oil and gas Mining Equipment, the exploitation particularly accelerating deep-sea oil-gas mining steel ensures national energy security, realizes one of most critical factor of energy strategy transfer.
Marine riser is the necessaries in marine drilling engineering, is mainly used in multiple field of operation such as drilling well, oil recovery, water filling and workover.Drilling water-separation pipe is a large-diameter steel pipe normally, and its major function is insulating sea water, protection drilling rod, for ship unit or between drilling unit and subsea wellheads circulation of drilling fluid loop is provided, and for drilling tool feeding subsea wellheads lead.Drilling fluid, by drill string, flows into shaft bottom, and then the annular space between marine riser column wall and drill string, turns back in the suction pit on the workplatform of sea.It is the important equipment unit of ocean deepwater oil-gas exploration and development.
Offshore Drilling Riser works under ocean severe environment because of it, is a kind of oil drill equipment with excessive risk, highly difficult, hi-tech, high added value.Due to by deep water ocean current, undercurrent effect produces eddy current, causes steel pipe longitudinally to produce distortion to a certain degree and whirlpool impulses dynamic, therefore requires that steel pipe is while having anti-deformation, also will have excellent anti-fatigue performance, require high to the metallurgical quality of steel pipe; Simultaneously to thickness and precision, the template of steel plate, and steel pipe ovality also has stricter requirement.China starts late, and is still in blank at Offshore Drilling Riser technical elements, does not also have method of determination and evaluation and the means of testing of deep water riser.At present, Offshore Drilling Riser overall system design and analytical technology only grasp by a few company external.They strictly block in product standard, production technology, the method for inspection etc. China, the abnormal height of import price, and single tube price is up to more than 1,000,000 yuan, and China's deepwater work relies on offshore company from pipe fitting completely to operation.
Therefore; the key of marine riser to be produced and manufacturing technology carries out detailed and deep exploration; formed and there is the marine riser alloying system of China's independent intellectual property right, industrial production technology and high-quality, marine riser product; fill up the blank of domestic and international high-performance marine riser, this is of great significance raising China marine oil and gas production efficiency, reduction Energy production cost and marine ecology protection tool.
Summary of the invention
The object of the present invention is to provide a kind of high-performance marine riser sheet material and production method, this high-performance marine riser sheet material, while meeting high-strength and high ductility, has good longitudinal non-deformability and excellent anti-fatigue performance.The tensile strength of steel plate: 600 ~ 1000MPa, yield strength: 500 ~ 800MPa, longitudinal yield tensile ratio≤0.85 of steel plate; The low-temperature impact toughness of-80 DEG C is greater than 200J.Can be used for manufacturing the extremely strict deep-sea marine riser production field of performance requriements.
The chemical composition mass percent of high-performance marine riser sheet material of the present invention is: C:0.05 ~ 0.10wt%, Si:0.10 ~ 0.30wt%, Mn:0.4 ~ 1.0wt%, Nb:0.02 ~ 0.05wt%, Mo:0.10 ~ 0.30wt%, Ni:0.5 ~ 2.0wt%, Cr:0.5 ~ 1.0wt%, Ti:0.01 ~ 0.015wt%, Cu:1.0 ~ 2.0wt%, P :≤0.010wt%, S :≤0.001wt%, N≤0.004wt%, O
2≤ 0.0015wt%, all the other are Fe and inevitable impurity.
High-performance marine riser preparation of plates method of the present invention comprises: smelting, continuous casting, heating, controlled rolling, controlled cooling model, thermal treatment.The technical parameter controlled in process is as follows:
Course of hot rolling: the Heating temperature of strand is 1160 ~ 1220 DEG C, and heat-up time is 2 ~ 6 hours; Described controlled rolling technique adopts two-phase control rolling, and comprise recrystallization zone rolling and Unhydrated cement rolling, finishing temperature control is at 780 ~ 860 DEG C, described roll rear controlled cooling model adopt accelerating cooling, speed of cooling >=5 DEG C/s, final cooling temperature: 450 ~ 550 DEG C, last air cooling is to room temperature;
Heat treatment process comprises: first quench, and being heated to by steel plate is 700 ~ 850 DEG C, partial austenitizing, and soaking time 0.5 ~ 2 hour, is quenched into room temperature; Then tempering, Heating temperature is 600 ~ 660 DEG C, is incubated 0.5 ~ 2 hour, steel plate come out of the stove after air cooling.
Performance marine riser sheet material microstructure characteristic of the present invention be ferrite+tempering bainite matrix on Dispersed precipitate tiny ε-Cu precipitate.
In the composition formation of high-performance marine riser sheet material of the present invention, the effect of each chemical composition is specially:
Mn:Mn can exist with solid solution condition in steel, also can enter in cementite and replace a part of Fe atom, play solution strengthening effect, can also form sulfide.Mn element is assembled in austenite, can improve stabilization of austenite.But easily occur banded structure in the steel that Mn content is higher, banded structure obviously can reduce the anti-fatigue performance of steel plate, so in high-performance marine riser of the present invention, Mn content optimum range: 0.4 ~ 1.0wt%.
Cu: Cu is topmost alloying element in the present invention.The effect of Cu improves material hardening capacity, and obtain martensite or bainite structure when ensureing critical area quenching, the prior effect of another one is the ε-Cu second-phase that Cu diffusion-precipitation in thermal treatment ag(e)ing process is tiny, improves the intensity of material.
Ni:Ni, as austenite former, can strengthen austenitic stability in continuous cooling process.The more important thing is, the Ni in steel can also increase substantially the toughness of material.In addition, in the steel higher containing Cu amount, for improving cc billet surface quality, usually Ni will be added, and 1/2, Cu and Ni that Ni content is at least Cu content add the corrosion resistance nature that can also improve material simultaneously.
S, P, O, N: these four kinds of elements all belong to harmful element in the high-performance marine riser sheet material of this invention, oxide compound formed in material matrix, sulfide etc. are various is mingled with the anti-fatigue performance that all can worsen steel plate for they.P :≤0.010wt%, S :≤0.001wt%, N≤0.004wt%, O so this several element needs strict control in the present invention:
2≤ 0.0015wt%.
The production method of a kind of high-performance deep sea marine riser sheet material of the present invention comprises smelting, continuous casting, heating, controlled rolling, controlled cooling model, thermal treatment process, be primarily characterized in that: the Heating temperature of described strand is 1160 ~ 1220 DEG C, according to the difference of steel plate thickness specification, heat-up time is 2 ~ 6 hours; Described controlled rolling technique adopts two-phase control rolling: at recrystallize rolling sequence, for obtaining the recrystallize austenite crystal of refinement, and roughing end temperature in GANTRY controls below 1050 DEG C, and deformation amount controlling is more than 25%; At Unhydrated cement rolling sequence, adopt the large press control technology of low temperature, finishing temperature control is at 780 ~ 860 DEG C; In described roller repairing process, for obtaining the bainite ferrite tissue of refinement, adopt the method accelerating cooling of section cooling, speed of cooling >=5 DEG C/s, final cooling temperature: 450 ~ 550 DEG C, last air cooling is to room temperature.
Thermal treatment process of the present invention is: first carry out critical area quenching, make the whole austenitizing of the bainite in hot-rolled steel sheet tissue and MA island, only remaining relatively soft phase ferritic structure, according to the difference of target ferrite content, Heating temperature is chosen at 700 ~ 850 DEG C of scopes, in order to ensure the abundant diffusion of alloying element, soaking time is 0.5 ~ 2 hour, obtains ferrite+martensite or ferrite bainite tissue after being quenched into room temperature; In drawing process, select high-temperature tempering process, object enables the Cu in composition with the form disperse educt of tiny ε-Cu second-phase, improve matrix strength, so Heating temperature is chosen at 600 ~ 660 DEG C, be incubated 0.5 ~ 2 hour, steel plate come out of the stove after air cooling.
The present invention can according to concrete performance requriements, and suitably adjustment chemical composition and process parameters range, obtain optimal " intensity-plasticity-toughness-fatigue " performance proportioning, meet different use properties requirements.
A kind of its mechanical performance index of high-performance water proof tubing of the present invention is as follows: steel plate tensile strength: 600 ~ 1000MPa, yield strength: 500 ~ 800MPa, longitudinal yield tensile ratio≤0.85 of steel plate; The low-temperature impact toughness of-80 DEG C is greater than 200J, has excellent anti-fatigue performance and corrosion resistance nature concurrently simultaneously.
The invention has the advantages that:
(1) steel plate cleanliness factor is high, microstructure even, avoids because inclusion and banded structure are to fatigability loss of energy.
(2) in steel plate, the ferrite of relatively soft phase and the second-phase Homogeneous phase mixing tissue of hard phase bainite and disperse educt impart the plastic deformation ability of steel plate excellence, guarantee that marine riser ocean current in laying and military service process in deep-sea the complex environment such as to wash away to the requirement of linear deformation performance.
(3) in steel plate of the present invention, C content is lower, and in addition higher Ni content and the tempered structure of even refinement ensure that steel plate has higher impelling strength.
(4) in steel plate, Cu, Cr, Ni content is higher, homogeneous microstructure, makes steel plate also have excellent corrosion resistance nature.
Accompanying drawing explanation
Fig. 1 is the impact (780 DEG C quenching) of quenching temperature on steel plate microstructure.
Fig. 2 is the impact (820 DEG C quenching) of quenching temperature on steel plate microstructure.
Fig. 3 is 25.4mm Plate Steel thickness x cross sectional 1/4th position precipitate light and shade field photo and demarcation (630 DEG C of tempering).
Embodiment
The present invention will be described to enumerate specific embodiment below; what be necessary to herein means out is that following concrete implementation step is only for the invention will be further described; do not represent limiting the scope of the invention, some nonessential amendments that other people make according to the present invention and adjustment still belong to protection scope of the present invention.
Embodiment 1
Constitutive material is counted according to mass percent:
C:0.07wt%, Si:0.30wt%, Mn:0.8wt%, Nb:0.03wt%, Mo:0.20wt%, Ni:1.0wt%, Cr:0.8wt%, Ti:0.012wt%, Cu:1.5wt%, P:0.0084wt%, S:0.0008wt%, N:0.0036wt%, O
2: 0.0010wt%, surplus is Fe and inevitable impurity, becomes 300mm strand through converter smelting, continuous casting.
Strand is heated to 1180 DEG C, is incubated 3.0 hours, then carry out first stage-recrystallization zone rolling, start rolling temperature is 1100 DEG C, and roughing final pass temperature is 1000 DEG C, roughing final pass deflection 25%; Subordinate phase-Unhydrated cement rolling, start rolling temperature is 950 DEG C, and finishing temperature is 850 DEG C, and rolling rear thickness of slab is 25.4mm.Be cooled to 480 DEG C with 10 DEG C/s cooling rate after rolling, then air cooling is to room temperature.
In hot-rolled steel sheet, get three blocks of experiment material, put into process furnace and be heated to 780 DEG C, 800 DEG C, 820 DEG C respectively, after insulation 120min, water-cooled is to room temperature, at 630 DEG C of heating and thermal insulation 100min, and air cooling of coming out of the stove.Steel plate after thermal treatment is carried out mechanical property inspection according to GB.
After testing, steel plate microstructure feature is that on ferrite+tempering bainite matrix, Dispersed precipitate a large amount of tiny ε-Cu precipitation second-phases.SEM photo under two typical quenching temperatures as shown in Figure 1 and Figure 2.The every mechanical property of steel plate is as shown in table 1.
The mechanical property of table 1 embodiment 1 steel plate
Embodiment 2
A kind of high-performance deep sea marine riser sheet material constitutive material is counted according to mass percent: C:0.07wt%, Si:0.30wt%, Mn:0.8wt%, Nb:0.03wt%, Mo:0.20wt%, Ni:1.0wt%, Cr:0.8wt%, Ti:0.012wt%, Cu:1.5wt%, P:0.0084wt%, S:0.0008wt%, N:0.0036wt%, O
2: 0.0010wt%, surplus is Fe and inevitable impurity, becomes 300mm strand through converter smelting, continuous casting.
Strand is heated to 1180 DEG C, is incubated 3.0 hours, then carry out first stage-recrystallization zone rolling, start rolling temperature is 1100 DEG C, and roughing final pass temperature is 1000 DEG C, roughing final pass deflection 25%; Subordinate phase-Unhydrated cement rolling, start rolling temperature is 950 DEG C, and finishing temperature is 850 DEG C, and rolling rear thickness of slab is 25.4mm.Be cooled to 480 DEG C with 10 DEG C/s cooling rate after rolling, then air cooling is to room temperature.
In hot-rolled steel sheet, get three blocks of experiment material, put into process furnace and be heated to 800 DEG C, after insulation 120min, water-cooled is to room temperature, then is heated to 600 DEG C, 630 DEG C and 650 DEG C respectively, insulation 120min, air cooling of coming out of the stove.Steel plate after thermal treatment is carried out mechanical property inspection according to GB.
After testing, steel plate microstructure feature is still that on ferrite and tempering bainite matrix, Dispersed precipitate a large amount of tiny ε-Cu and separated out second-phase, as shown in Figure 3.
The pattern of the second-phase ε-Cu separated out in steel plate when Fig. 3 shows 630 DEG C of tempering and demarcation thereof.
Fig. 3 is 25.4mm Plate Steel thickness x cross sectional 1/4th position precipitate light and shade field photo and demarcation (630 DEG C of tempering).
The mechanical property of table 2 embodiment 2 steel plate
Embodiment 3
A kind of high-performance deep sea marine riser sheet material constitutive material is counted according to mass percent: C:0.07wt%, Si:0.30wt%, Mn:0.8wt%, Nb:0.03wt%, Mo:0.20wt%, Ni:1.0wt%, Cr:0.8wt%, Ti:0.012wt%, Cu:1.5wt%, P:0.0084wt%, S:0.0008wt%, N:0.0036wt%, O
2: 0.0010wt%, surplus is Fe and inevitable impurity, becomes 300mm strand through converter smelting, continuous casting.
Strand is heated to 1180 DEG C, is incubated 3.0 hours, then carry out first stage-recrystallization zone rolling, start rolling temperature is 1100 DEG C, and roughing final pass temperature is 1000 DEG C, roughing final pass deflection 25%; Subordinate phase-Unhydrated cement rolling, start rolling temperature is 950 DEG C, and finishing temperature is 850 DEG C, and rolling rear thickness of slab is 25.4mm.Be cooled to 480 DEG C with 10 DEG C/s cooling rate after rolling, then air cooling is to room temperature.
In hot-rolled steel sheet, get three blocks of experiment material, put into process furnace and be heated to 800 DEG C, after insulation 120min, water-cooled is to room temperature, and reheat 630 DEG C, three block plates are incubated 30min, 80min, 120min respectively, air cooling of coming out of the stove.Steel plate after thermal treatment is carried out mechanical property inspection according to GB.
After testing, steel plate microstructure feature is still that on ferrite and tempering bainite matrix, Dispersed precipitate a large amount of tiny ε-Cu and separated out second-phase, and only along with the difference of tempering insulation time, the amount of precipitation of second-phase is obviously different.
The mechanical property of table 3 embodiment 3 steel plate
Claims (2)
1. a high-performance marine riser sheet material, it is characterized in that, the chemical composition of this marine riser sheet material is: C:0.05 ~ 0.10wt%, Si:0.10 ~ 0.30wt%, Mn:0.4 ~ 1.0wt%, Nb:0.02 ~ 0.05wt%, Mo:0.10 ~ 0.30wt%, Ni:0.5 ~ 2.0wt%, Cr:0.5 ~ 1.0wt%, Ti:0.01 ~ 0.015wt%, Cu:1.0 ~ 2.0wt%, P :≤0.010wt%, S :≤0.001wt%, N≤0.004wt%, O
2≤ 0.0015wt%, all the other are Fe and inevitable impurity.
2. a production method for high-performance marine riser sheet material described in claim 1, comprises smelting, continuous casting, heating, controlled rolling, controlled cooling model, thermal treatment process, it is characterized in that: the technical parameter controlled in technique is:
Heating temperature is 1160 ~ 1220 DEG C, and heat-up time is 2 ~ 6 hours; Controlled rolling technique adopts two-phase control rolling, and comprise recrystallization zone rolling and Unhydrated cement rolling, finishing temperature control is at 780 ~ 860 DEG C, roll rear controlled cooling model and adopt accelerating cooling, speed of cooling >=5 DEG C/s, final cooling temperature: 450 ~ 550 DEG C, last air cooling is to room temperature;
Thermal treatment process is: first quench, and being heated to by steel plate is 700 ~ 850 DEG C, partial austenitizing, and soaking time 0.5 ~ 2 hour, is quenched into room temperature; Then tempering, Heating temperature is 600 ~ 660 DEG C, is incubated 0.5 ~ 2 hour, steel plate come out of the stove after air cooling.
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Cited By (4)
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| CN105154789A (en) * | 2015-10-10 | 2015-12-16 | 武汉钢铁(集团)公司 | High-performance marine riser steel and production method |
| CN106086325A (en) * | 2016-07-22 | 2016-11-09 | 柳州科尔特锻造机械有限公司 | A kind of Nb Ti micro alloyed steel Technology for Heating Processing |
| CN106435398A (en) * | 2016-10-15 | 2017-02-22 | 睿智钢业有限公司 | Anti-corrosion welding structural steel and preparation method thereof |
| CN108754325A (en) * | 2018-06-14 | 2018-11-06 | 鞍钢股份有限公司 | 560MPa grades of Cu timeliness steel for hot-bending bends plates and production method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108754325A (en) * | 2018-06-14 | 2018-11-06 | 鞍钢股份有限公司 | 560MPa grades of Cu timeliness steel for hot-bending bends plates and production method |
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Application publication date: 20150325 |