CN108570542A - The manufacturing method of high-strength steel for oil well pipes - Google Patents
The manufacturing method of high-strength steel for oil well pipes Download PDFInfo
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- CN108570542A CN108570542A CN201810466011.7A CN201810466011A CN108570542A CN 108570542 A CN108570542 A CN 108570542A CN 201810466011 A CN201810466011 A CN 201810466011A CN 108570542 A CN108570542 A CN 108570542A
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- strip
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The present invention provides a kind of manufacturing methods of high-strength steel for oil well pipes, including：Produce slab；Slab is heated to 1210 DEG C 1290 DEG C, heating time is more than 3 hours；Slab after heating is subjected to roughing and obtains intermediate base, roughing temperature is 1180 DEG C 1220 DEG C；For base to obtain hot rolled plate, final rolling temperature is 980 DEG C 1020 DEG C among finish rolling；For finish to gauge hot rolled plate to obtain strip, finishing temperature is 830 DEG C 870 DEG C；Natural cooling strip；Strip is heated to hardening heat, hardening is cooled to room temperature after quenching and preserving heat, heats strip again to temperature, room temperature is air-cooled to after tempering heat preservation.The present invention is intended to provide a kind of method manufacturing high-strength steel for oil well pipes using low-intensity slab.
Description
Technical field
The present invention relates to strip productions and Field of Heat-treatment to be more specifically related to a kind of system of high-strength steel for oil well pipes
Make method.
Background technology
Oil well pipe is divided into three classes：Casing, oil pipe and drill string component, middle sleeve account for entire oil well pipe as basic material and disappear
70%~80% taken.Under traditional exploitation pattern, casing can be subdivided into conduit, surface pipe, protective casing and production set again
Pipe.Increase with the depth of oil well, the diameter of oil well pipe will reduce, and rank increases, in deep-well and ultradeep well, protective casing and
The highest level that production casing is related at present has reached Q125, even V150.In application aspect, future trend is predominantly very
Advise oil gas exploitation, than it is more typical be exactly shale gas exploitation.
Currently, high-strength oil casing mostly uses seamless steel pipe, and the HFW (high frequencies for occurring may replace seamless casing in market
Resistance weld pipe) casing, HFW casings gradually develop to ultradeep well and special by the advantages such as its superperformance, high-precision, low cost
Purposes casing, such as highly resistance squeezing bushing, high strength casing, but seamless casing can not be replaced completely.
The main reason for discovery technique level is to make high intensity HFW casings, state for being rolled using high-strength plate in investigation
Interior tubulation apparatus ability is still relatively short of, while high intensity coiled sheet has that Welding Problems, hot-zone softening and high internal stress etc. are asked
Topic etc., pipe factory still cannot preferably solve at home, and high rejection rate directly results in cost increase, cannot effectively substitute seamless steel pipe.
Invention content
For problem present in the relevant technologies, it is high using the manufacture of low-intensity slab that the purpose of the present invention is to provide a kind of
The method of strong steel for oil well pipes.
To achieve the above object, the present invention provides a kind of manufacturing methods of high-strength steel for oil well pipes, including：
Produce slab；
Slab is heated to 1210 DEG C -1290 DEG C, heating time is more than 3 hours；
Slab after heating is subjected to roughing and obtains intermediate base, roughing temperature is 1180 DEG C -1220 DEG C；
For base to obtain hot rolled plate, final rolling temperature is 980 DEG C -1020 DEG C among finish rolling；
For finish to gauge hot rolled plate to obtain strip, finishing temperature is 830 DEG C -870 DEG C；
Natural cooling strip；
Strip is heated to hardening heat, hardening is cooled to room temperature after quenching and preserving heat, is heated strip again to temperature, is returned
It is air-cooled to room temperature after fire heat preservation.
According to one embodiment of present invention, production slab includes：Pass through converter smelting successively and ladle refining furnace refines
Molten steel is obtained, molten steel is subjected to full guard casting to produce slab.
According to one embodiment of present invention, slab includes：C：0.20%-0.30%, Si：0.1%-0.3%, Mn：
1.0%-1.5%, Mo：0.2-0.4%, Cr：The total amount ＜ 0.1% of 0.2%-0.4%, Nb, V and Ti.
According to one embodiment of present invention, further include before natural cooling strip：It will carry out the strip obtained after finish to gauge
It carries out leading portion and concentrates water cooling, then crimp strip, coiling temperature is 600 DEG C -640 DEG C.
According to one embodiment of present invention, it is 6mm by the belt steel thickness that finish to gauge obtains.
According to one embodiment of present invention, heating strip to hardening heat includes：Extremely by electromagnetic induction heating strip
Hardening heat；Heating strip to temperature includes again：Pass through electromagnetic induction heating strip to temperature.
According to one embodiment of present invention, hardening heat is 950 DEG C.
According to one embodiment of present invention, Quenching Soaking Time 1min.
According to one embodiment of present invention, temperature is 550 DEG C.
According to one embodiment of present invention, tempering insulation time 1min.
The beneficial technical effect of the present invention lies in：
The manufacturing method of high-strength steel for oil well pipes of the present invention passes through a series of heat treatment works using low-intensity slab
Skill upgrades to the high tensile steel tube that can meet high-strength steel for oil well pipes requirement, and tubulation process is easily controllable, heat treatment production effect
Rate is high；And existing Welding Problems, hot-zone softening problem and height can be crimped using high intensity slab to avoid direct
Internal stress problem etc..
Description of the drawings
Fig. 1 is the flow chart of manufacturing method according to an embodiment of the present invention；
Fig. 2 shows according to an embodiment of the present invention, the microstructure of strip after finish to gauge；
Fig. 3 shows according to an embodiment of the present invention, the microstructure of strip after finish to gauge；
Fig. 4 shows that according to an embodiment of the present invention strip is observed after Overheating Treatment by metallographic microscope
Microstructure；
Fig. 5 shows that according to an embodiment of the present invention strip is observed after Overheating Treatment by scanning electron microscope (SEM)
The microstructure arrived.
Specific implementation mode
Below with reference to attached drawing, embodiments of the present invention is described in detail.
As shown in Figure 1, An embodiment provides a kind of manufacturing methods of high-strength steel for oil well pipes.The manufacture
Method includes：Produce slab；Hot rolling is carried out to obtain strip to slab；And strip is heat-treated.
Wherein, the process that hot rolling is carried out to slab specifically includes：Slab is heated to 1210 DEG C -1290 DEG C, heating time is big
In 3 hour, the slab after heating is subjected to roughing and obtains intermediate base, roughing temperature is 1180 DEG C -1220 DEG C, among finish rolling base with
Hot rolled plate is obtained, final rolling temperature is 980 DEG C -1020 DEG C, and for finish to gauge hot rolled plate to obtain strip, finishing temperature is 830 DEG C -870 DEG C,
Natural cooling strip.
The process being heat-treated to strip further comprises：Strip is heated to hardening heat, hardening is cold after quenching and preserving heat
But to room temperature, strip is heated again to temperature, room temperature is air-cooled to after tempering heat preservation.
It is to be understood that the slab involved by above-described embodiment is a kind of low-intensity slab, using this low-intensity plate
Base carries out a series of hot rollings and heat treatment process can obtain the steel pipe that disclosure satisfy that high-strength steel for oil well pipes intensity requirement, and
To avoid direct existing Welding Problems, hot-zone softening problem and high internal stress problem can be crimped using high intensity slab
Deng.
The manufacturing method of high-strength steel for oil well pipes involved by above-described embodiment passes through a series of heat using low-intensity slab
Treatment process upgrades to the high tensile steel tube that can meet high-strength steel for oil well pipes requirement, and tubulation process is easily controllable, heat treatment
Production efficiency is high.
According to one embodiment of present invention, the process for producing slab further comprises：Pass through converter smelting and steel successively
Packet refining furnace (LF) refining obtains molten steel, and molten steel is carried out full guard casting to produce slab.
Further, in one embodiment, above-mentioned slab includes：C：0.20%-0.30%, Si：0.1%-0.3%,
Mn：1.0%-1.5%, Mo：0.2-0.4%, Cr：The total amount ＜ 0.1% of 0.2%-0.4%, Nb, V and Ti.It should can manage
The ratio of solution, above-mentioned chemical composition is its chemical composition mass percent in slab, in addition to above-mentioned various chemical compositions,
Remaining ingredient of slab is iron or other inevitable impurity.Slab in above-described embodiment is that a kind of low intensive middle carbon is micro-
Steel alloy, such slab is at low cost, heat treatment production efficiency is high, and the intensity of Q125 grades of casings can either be reached after being heat-treated
Preferable toughness can be kept again.
Specifically, such as in one embodiment, as shown in table 1, the ingredient 1 of slab includes C：0.20%, Si：0.2%,
Mn：1.5%, Mo：0.3%, Cr：0.3%, Nb：0.03%, Ti：0.02%.The wherein content of V is less, or even in some implementations
The content of V can be ignored in example.
In this embodiment, as shown in table 2 to the band steel mechanical property after slab progress hot rolling, wherein Rt0.5 is surrender
Intensity, Rm is tensile strength, A50 refers to stretching force of having no progeny.The entirety for the strip that the ingredient 1 of slab obtains after hot rolling is strong
Degree is within tubulation apparatus ability.Also, as shown in Figures 2 and 3, the microstructure of the above-mentioned strip after hot rolling is typical case
Ferrite and pearlite tissue.
Then, then to above-mentioned strip it is heat-treated.As shown in table 3, the band steel mechanical property through Overheating Treatment is entirely capable of
Enough meet Q125 grades of casing property requirements in API 5CT (petroleum casing pipe specification table).Also, as shown in Figure 4 and Figure 5, through overheat
The strip of processing is typical tempered martensite.
Specifically, in one further embodiment, the slab of ingredient 1 is carried out being heated to 1250 DEG C, heating time
More than 3 hours, the slab after heating is subjected to roughing and obtains intermediate base, roughing temperature is 1180 DEG C, and base is to obtain among finish rolling
Hot rolled plate, final rolling temperature are 1000 DEG C, and finish to gauge hot rolled plate is to obtain strip, and finishing temperature is 860 DEG C, the strip power finally obtained
Performance is learned to be fully able to meet the intensity of casing and toughness reguirements.
1 slab smelting chemical ingredient (%) of table
Band steel mechanical property after 2 hot rolling of table
| Rt0.5(MPa) | Rm(MPa) | Yield tensile ratio | A50(%) | |
| Ingredient 1 | 597 | 731 | 0.80 | 24.5 |
| Ingredient 2 | 556 | 728 | 0.76 | 24.0 |
| Ingredient 3 | 535 | 725 | 0.74 | 25.5 |
| Ingredient 4 | 507 | 717 | 0.71 | 25.0 |
Performance after table 3 is heat-treated
| Rt0.5(MPa) | Rm(MPa) | Yield tensile ratio | A50(%) | |
| Ingredient 1 | 896 | 953 | 0.94 | 14.0 |
| Ingredient 2 | 918 | 987 | 0.93 | 14.5 |
| Ingredient 3 | 943 | 1055 | 0.89 | 16.5 |
| Ingredient 4 | 932 | 1013 | 0.92 | 15.5 |
| The requirement of Q125 standards | 862-1034 | ＞ 931 | - | ≥13 |
With reference to table 1 to table 3, in another embodiment, the ingredient 2 of slab includes C：0.23%, Si：0.2%, Mn：
1.3%, Mo：0.3%, Cr：0.3%, Nb：0.03%, Ti：0.02%.Similarly with previous embodiment, the slab of such ingredient
The integral strength of the strip obtained after hot rolling is within tubulation apparatus ability.Also, the strip mechanical property through Overheating Treatment
Q125 grades of casing property requirements in API5CT can be fully able to meet.
According to another embodiment, the ingredient 3 of slab includes C：0.7%, Si：0.2%, Mn：1.1%, Mo：0.3%,
Cr：0.3%, Nb：0.03%, Ti：0.02%.Similarly with previous embodiment, the slab of such ingredient obtains after hot rolling
Strip integral strength within tubulation apparatus ability.Also, the band steel mechanical property through Overheating Treatment is fully able to meet
Q125 grades of casing property requirements in API 5CT.
Referring again to table 1 to table 3, in another embodiment, the ingredient 4 of slab includes C：0.30%, Si：0.2%,
Mn：1.0%, Mo：0.3%, Cr：0.3%, Nb：0.03%, Ti：0.02%.Similarly with previous embodiment, such ingredient
The integral strength for the strip that slab obtains after hot rolling is within tubulation apparatus ability.Also, the strip power through Overheating Treatment
It learns performance and is fully able to meet Q125 grades of casing property requirements in API 5CT.
Further, in one embodiment, the above-mentioned process that hot rolling is carried out to slab further comprises：In natural cooling
Before strip, the strip that obtains after finish to gauge will be carried out leading portion is carried out to concentrate water cooling, then crimp strip, coiling temperature is 600 DEG C-
640℃。
According to one embodiment of present invention, it is 6mm by the belt steel thickness that finish to gauge obtains.It is, of course, understood that
According to the specifically used difference that needs, strip can also have other thickness, this can as the case may be depending on, the present invention is not
It is confined to this.
In one embodiment, heat treatment is carried out to strip to further comprise：Pass through electromagnetic induction heating strip to quenching
Temperature, and pass through electromagnetic induction heating strip to temperature.Strip is heated by the way of electromagnetic induction, is added
Thermal velocity is fast, efficient, and strip can be made to reach the intensity of Q125 grades of casings and effectively reduce production cost.
According to one embodiment of present invention, the hardening heat during being heat-treated to strip is 950 DEG C.
According to one embodiment of present invention, the Quenching Soaking Time during being heat-treated to strip is 1min.
According to one embodiment of present invention, the temperature during being heat-treated to strip is 550 DEG C.
According to one embodiment of present invention, the tempering insulation time during being heat-treated to strip is 1min.
Referring again to Fig. 1 to Fig. 5, the manufacture and heat treatment of the high-strength steel for oil well pipes that one embodiment of the present of invention provides
Upgrade method is related to one kind to comprising C：0.20%-0.30%；Si：0.1%-0.3%；Mn：1.0%-1.5%；Mo：0.2-
0.4%；Cr：0.2%-0.4%；The slab of Nb+V+Ti ＜ 0.1% is rolled and is heat-treated to produce the side of high-strength oil casing
Method.
The process route taken is：Converter smelting, LF refining, continuous casting full guard casting production ingredient is passed sequentially through to meet
It is required that slab；1210 DEG C -1290 DEG C of slab soaking temperature, soaking time are more than 3h, 1180 DEG C -1220 DEG C of roughing entrance, essence
It is rolled into 980 DEG C -1020 DEG C of mouth, 830 DEG C -870 DEG C, belt steel thickness 6.0mm of finish to gauge rolls rear leading portion and concentrates water cooling, 600 DEG C -640 DEG C
Curling, strip natural cooling；Strip electromagnetic induction heating to 950 DEG C of heat preservation 1min hardening are cooled to room temperature, and then electromagnetism sense
It should be heated to 550 DEG C of heat preservation 1min and be air-cooled to room temperature.
The technical principle of above-described embodiment is：The low manganese of carbon-combines a small amount of Cr, Mo that can improve and quenches in the chemical composition of slab
Permeability, and ensure that certain intensity and preferable upgrading potential can be obtained；High temperature quenching obtains martensitic structure structure, high temperature
The toughness for improving martensite is reduced after tempering, obtains the high strength casing of obdurability Proper Match.
The manufacturing method that above-described embodiment is related to can reduce the cost of alloy of high-strength oil casing, improve the heat treatment of HFW welded tubes
Production efficiency, specially：The low manganese of middle carbon-combines a small amount of Cr, Mo to improve quenching degree and ensuring and obtains certain intensity and preferable
Upgrading potential；High temperature quenching obtains martensitic structure structure, reduces the toughness for improving martensite after high tempering, obtains obdurability
The high strength casing of Proper Match.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, any made by repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of manufacturing method of high-strength steel for oil well pipes, which is characterized in that including：
Produce slab；
The slab is heated to 1210 DEG C -1290 DEG C, heating time is more than 3 hours；
The slab after heating is subjected to roughing and obtains intermediate base, roughing temperature is 1180 DEG C -1220 DEG C；
For intermediate base described in finish rolling to obtain hot rolled plate, final rolling temperature is 980 DEG C -1020 DEG C；
For hot rolled plate described in finish to gauge to obtain strip, finishing temperature is 830 DEG C -870 DEG C；
Strip described in natural cooling；
The strip is heated to hardening heat, hardening is cooled to room temperature after quenching and preserving heat, heats the strip again to being tempered temperature
Degree is air-cooled to room temperature after tempering heat preservation.
2. manufacturing method according to claim 1, which is characterized in that the production slab includes：
Pass through converter smelting successively and ladle refining furnace refining obtains molten steel, the molten steel is subjected to full guard casting to produce plate
Base.
3. manufacturing method according to claim 1, which is characterized in that the slab includes：
C：0.20%-0.30%, Si：0.1%-0.3%, Mn：1.0%-1.5%, Mo：0.2-0.4%, Cr：0.2%-
0.4%, the total amount ＜ 0.1% of Nb, V and Ti.
4. manufacturing method according to claim 1, which is characterized in that further include before strip described in the natural cooling：
It will carry out the strip obtained after the finish to gauge and carry out leading portion concentration water cooling, then crimp the strip, coiling temperature is
600℃-640℃。
5. manufacturing method according to claim 1, which is characterized in that passing through the belt steel thickness that the finish to gauge obtains is
6mm。
6. manufacturing method according to claim 1, which is characterized in that the heating strip to hardening heat includes：
Pass through strip described in electromagnetic induction heating to the hardening heat；
The strip to the temperature that heats again includes：
Pass through strip described in electromagnetic induction heating to the temperature.
7. manufacturing method according to claim 1, which is characterized in that the hardening heat is 950 DEG C.
8. manufacturing method according to claim 1, which is characterized in that the Quenching Soaking Time is 1min.
9. manufacturing method according to claim 1, which is characterized in that the temperature is 550 DEG C.
10. manufacturing method according to claim 1, which is characterized in that the tempering insulation time is 1min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810466011.7A CN108570542B (en) | 2018-05-15 | 2018-05-15 | Method for manufacturing steel for high-strength oil well pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810466011.7A CN108570542B (en) | 2018-05-15 | 2018-05-15 | Method for manufacturing steel for high-strength oil well pipe |
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| CN108570542A true CN108570542A (en) | 2018-09-25 |
| CN108570542B CN108570542B (en) | 2020-02-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109207851A (en) * | 2018-09-28 | 2019-01-15 | 宝山钢铁股份有限公司 | A kind of ultra-high strength steel plate and its manufacturing method |
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| CN109207851A (en) * | 2018-09-28 | 2019-01-15 | 宝山钢铁股份有限公司 | A kind of ultra-high strength steel plate and its manufacturing method |
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| CN108570542B (en) | 2020-02-21 |
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