CN106906347A - A kind of method for changing low-carbon micro steel-alloy seam organization and performance - Google Patents
A kind of method for changing low-carbon micro steel-alloy seam organization and performance Download PDFInfo
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- CN106906347A CN106906347A CN201710193226.1A CN201710193226A CN106906347A CN 106906347 A CN106906347 A CN 106906347A CN 201710193226 A CN201710193226 A CN 201710193226A CN 106906347 A CN106906347 A CN 106906347A
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- 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
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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Abstract
The invention discloses a kind of method for changing low-carbon micro steel-alloy seam organization and performance, low-carbon micro steel-alloy weld seam is heated to 820 DEG C~950 DEG C using Medium frequency induction fast heating method, in the temperature range, applying external force to low-carbon micro steel-alloy weld seam is plastically deformed it；Less than 150 DEG C are cooled to, low-carbon micro steel-alloy weld seam is heated to 650 DEG C~780 DEG C again, in the temperature range, applying certain external force again to low-carbon micro steel-alloy weld seam makes it produce plastic deformation；It is air cooled to room temperature.Using the method in the present invention, the as-cast structure of low-carbon micro steel-alloy weld seam can be changed, make its tissue close with mother metal or consistent, weld seam combination property is also basically identical with mother metal simultaneously, weld seam is avoided in use because organizing the problems such as thick, excessive high hardness, excessive residual stress and the not good cracking for bringing of seam center, corrosion, or because weld seam can not it is up to standard scrap, make life-span of the continuous pipe of inclined weld up to more than 95% with the main pipe life-span.
Description
Technical field：
It is more particularly to a kind of to change low-carbon micro steel-alloy seam organization and property the present invention relates to a kind of low-carbon micro steel-alloy
The method of energy.
Background technology：
A large amount of oil pipes are used in oil-gas mining, the value of tubing accounts for the 60% of oil equipment total assets.Oil is special
It is great to the development relationship of petroleum industry with the quality of steel pipe, kind, performance.The general length of traditional oils well casing is 10 meters or so,
It is attached by box cupling or welding during operation, the activity duration is very long, inefficiency.Because joint is more, and joint property
Can difference is larger compared with body, easily produce security incident, there is very big security risk.
Continuous pipe (Coiled Tube, CT) is a kind of novel tube of joint length up to myriametre, can carrying operation instrument
The various operations such as well workover, well logging, drilling well, completion are carried out, oil transportation, gas transmission line or special military use is also used as.
Continuous pipe is with the difference of conventional steel maximum, traditional fished pipe be by cut lengths (such as 12 meters) packed and transported,
Get up to come into operation using the docking of boxing technique again in use at the scene.And continuous pipe joint length is up to myriametre, finished product winding
On reel, opened when using, rewound after fulfiling assignment and used the standby next time on reel.Thus conventional steel is in finished product 12
Rice is outer can not to influence other positions tube quality with defective after excision, and single nearly myriametre is continuously managed to have at one and lacked
Fall into, otherwise whole myriametre steel pipe is all scrapped.In addition, or else can be reclaimed as conventional steel welding is latter using, belong to disposable
Consumptive material, and continuous pipe is wrapped on reel using after complete, can be reused many times, and substantially increases tubing utilization rate, is reduced
Material cost.
The manufacturing technology difficulty of continuous pipe is very big, how disposably continuously to produce single myriametre and continuously manages, and ensures single
The uniformity consistency of continuous each position performance of pipe product of nearly myriametre, is one of continuous pipe manufacture key problem in technology difficult point.Initial
Continuous pipe uses the manufacturing process of boxing docking, using the continuous pipe ring weld seam service life of this technique manufacture less than mother
The 25% of pipe, and due to the unstability of weldquality, the situation of unexpected fracture often occurs, it is very risky.With steel
Iron smelts the progress with rolling technique, and the roll bending length used by continuous pipe product is more and more long, and the joint length of continuous pipe also reaches
To 100 meters, but the hidden danger of girth joint is still present.The conventional continuous pipe caliber of low-carbon micro steel-alloy is 25.4 millimeters~89
Millimeter, joint length will disposably produce more than 3000 meters of continuous pipe more than 3000 meters, it is necessary to 3000 meters of joint length
Hot rolled strip above is used as raw material.The progress for relying solely on steel technology is difficult thoroughly to solve this technical barrier.
The progress of modern steel tube fabrication technique, the continuous production of steel pipe has not been problem, using kink technology or online right
Connection technology, hot rolled strip is welded together before steel pipe forming, it is possible to realize the continuous production of steel pipe.But due to weld seam matter
Amount is unreliable, and steel band butt weld position typically can all cut off after the completion of steel pipe forming welding.Under normal circumstances, Yong Huye
Butt tube will not be received.
The 1980s, steel band docking technique is also improved in the manufacturing process of continuous pipe, optimize butt welding
Seam quality, has eliminated the continuous pipe product of girth welding technology docking, greatly improves the life-span of continuous pipe position while welding, has reached mother
More than the 60% of material.But due to weld seam, structure property and mother metal differ greatly in itself, and butt weld position is still entirely to connect
The weak place of continuous pipe book the most, in addition due to continuous pipe range phase operation application in Oil/gas Well, underground Service Environment is extremely severe,
The fatigue that the Action of Combined Loads such as tensile, compressive, bending and plastic deformation cause should be born, again by hydrogen sulfide, chlorion, water etc.
The corrosion impact of corrosive medium, while the also influence of temperature, therefore, the position is still to find defect or produce fracture more
Place, potential safety hazard highest.
The content of the invention：
In order to overcome the above-mentioned deficiencies of the prior art, the invention provides one kind change low-carbon micro steel-alloy seam organization with
The method of performance.After being processed steel band butt weld using method of the present invention, low-carbon micro steel-alloy weldering is changed
The as-cast structure of seam, make its tissue close with mother metal or consistent, while weld seam combination property is also suitable with mother metal, it is to avoid weld seam
In use because organizing thick, excessive high hardness, residual stress excessive and the not good cracking for bringing of seam center, corrosion etc. are asked
Topic, or because weld seam can not it is up to standard scrap.The continuous pipe position while welding entirety longevity that steel band after being processed using this method is produced
Life is greatly improved, up to more than the 95% of the main pipe life-span.
The technical solution adopted in the present invention is：
A kind of method for changing low-carbon micro steel-alloy seam organization and performance, its main technique includes, by low-carbon microalloy
Steel weld seam is heated to 820 DEG C~950 DEG C, and after reaching design temperature, applying external force to low-carbon micro steel-alloy weld seam deforms it；It is cold
But to less than 150 DEG C, low-carbon micro steel-alloy weld seam is heated to 650 DEG C~780 DEG C again, in the temperature range, to low-carbon (LC)
Micro alloyed steel weld seam applies certain external force again is deformed it；It is air cooled to room temperature.
According to mass percent, the composition of the low-carbon micro steel-alloy is：C 0.05~0.20, Si≤0.45, Mn 0.5
~2.0, Cr 0.4~0.7, Ni≤0.25, Cu≤0.4, Mo≤0.25, Nb≤0.06, and limit P, S for P≤0.02, S≤
0.003, balance of Fe and inevitable impurity element.
The low-carbon micro steel-alloy weld seam can be carried out using TIG weldering+filler wires or Plasma Welding+filler wire technique
Welding.
The scheme is servo-actuated mode of heating using Medium frequency induction, and weld seam is integrally heated, and heating-up temperature is 820 DEG C~950
DEG C, firing rate is 30~35 DEG C/sec.
When the scheme is integrally heated to weld seam 820 DEG C~950 DEG C using the servo-actuated mode of heating of Medium frequency induction, stop adding
Heat, while applying external force to weld seam, external force direction is perpendicular to the mother metal surface where low-carbon micro steel-alloy weld seam.
The external force size that the scheme applies to weld seam is 3~5 tons, can also use forging and stamping mode using mode is rolled
Apply external force.
After the scheme applies external force to weld seam, weld seam is air cooled to less than 150 DEG C.
It is described weld seam is air cooled to less than 150 DEG C after, carry out second heating to weld seam, heating-up temperature is 650 DEG C~780
DEG C, firing rate is 30~35 DEG C/sec.
When the scheme is integrally heated to weld seam 650 DEG C~780 DEG C using the servo-actuated mode of heating of Medium frequency induction, stop adding
Heat, while applying external force to weld seam, external force direction is perpendicular to the mother metal surface where low-carbon micro steel-alloy weld seam.
The low-carbon micro steel-alloy weld seam can be carried out using TIG weldering+filler wires or Plasma Welding+filler wire technique
Welding, the composition of the welding wire includes：C 0.04~0.08, Si 0.01~0.2, Mn 0.7~1.3, P≤0.0095, S≤
0.008th, Mo 0.1~0.3, Ni 0.5~1.3.
Compared with prior art, the beneficial effects of the invention are as follows：Using the method in the present invention, thus it is possible to vary the micro- conjunction of low-carbon (LC)
The as-cast structure of golden steel weld seam, crystal grain thinning makes weld grain degree bring up to 12 grades or so, makes its tissue close with mother metal or one
Cause, while eliminating weld residual stress, make weld defect soldering, increase substantially plastic property of weld bead toughness, weld seam combination property
It is basically identical with mother metal, it is to avoid weld seam is in use because organizing thick, excessive high hardness, residual stress excessive and weld seam shape
The not good cracking for bringing of looks, corrosion the problems such as, or because weld seam can not it is up to standard scrap.It is oblique to continuous pipe using the method for the present invention
After weld seam is processed, the life-span containing the continuous pipe of inclined weld is up to more than 95% with the main pipe life-span.Continuous pipe service life is carried
It is high by more than 30%.
In addition to continuous pipe product, in welded still pipe field, using this method, it is possible to reduce the waste of banjo fixing butt jointing, improve
The utilization rate of raw material, Tube yield improves more than 3%.
Brief description of the drawings：
Fig. 1 is plasma silk filling technique welding point before processing butt weld macrograph；
Fig. 2 is butt weld macrograph after plasma silk filling technique welding point treatment.
Fig. 3 is plasma silk filling technique welding point before processing welding heat affected zone macrograph；
Fig. 4 is welding heat affected zone macrograph after plasma silk filling technique welding point treatment.
Fig. 5 is mother metal macrograph.
Fig. 6 is P+T welding point before processing butt weld macrographs；
Fig. 7 is butt weld macrograph after the treatment of P+T welding points.
Fig. 8 is P+T welding point before processings welding heat affected zone macrograph；
Fig. 9 is welding heat affected zone macrograph after the treatment of P+T welding points.
Specific embodiment：
The present invention is further described below in conjunction with the accompanying drawings.
Embodiment one：
Fig. 1, Fig. 3 are the microscopic structure photograph of CT80 grades of connecting pipes raw material steel band butt weld and welding heat affected zone
Piece.Welding is welded using plasma silk filling technique.Examined before non-Welded Joints carry out structure property optimization processing
Survey, welding point microhardness HV10Up to more than 300, exceed 248 minimums of choice requirement in corrosive environment.Meanwhile, not
Welding joint structure through processing is thick, plasticity extreme difference.CT80 grade of steels, the external diameter being made of undressed welding point
The continuous pipe of 31.8mm, thickness 3.18mm carries out continuous pipe low cycle fatigue test, no more than 100 times with regard to fracture failure.
Inventor uses special continuous pipe steel band butt weld thermomechanical treatment device, and it is hot that Welded Joints carry out deformation
Treatment, heating-up temperature is 895 DEG C, to reach and carry out heat to weld seam after heating-up temperature and roll, and deforms it, and the grinding pressure of applying is 3
Ton.After rolling, weld seam is cooled to less than 150 DEG C.Heating weld seam is carried out after reaching heating-up temperature to 680 DEG C to weld seam again
Roll, the grinding pressure of applying is 3 tons.After having rolled, weld seam is air cooled to room temperature.
The Seam and heat effected zone microhardness of the continuous pipe steel band banjo fixing butt jointing processed using process above is fallen below
Less than 248, original thick weld seam is greatly improved with heat affected area tissue, and residual stress is greatly reduced.
CT80 grades of continuous pipe product being made of the docking steel band after the PROCESS FOR TREATMENT, fatigue life is up to 550-
It is 650 times, suitable with the main pipe fatigue life without butt weld.Without the same grade of steel being made of the steel band of weld seam optimization processing
Continuous pipe, fatigue life is only 100 times or so, and due to the inhomogeneities of welding joint structure performance, is deposited in use
In very big potential safety hazard.
Embodiment two：
Fig. 6, Fig. 8 are the microscopic structure photograph of CT80 grades of connecting pipes raw material steel band butt weld and welding heat affected zone
Piece.Welding point is welded using P+T techniques (plasma bottoming+TIG cappings).Welding point is not optimized before processing,
Welding point highest microhardness HV10Up to more than 294, also considerably beyond the 248 of standard requirement.Meanwhile, weld seam and heat affecting
District's groups knit thick, and combination property is bad.
Inventor uses special continuous pipe steel band butt weld thermomechanical treatment device, and it is hot that Welded Joints carry out deformation
Treatment, heating-up temperature is 895 DEG C, to reach and carry out heat to weld seam after heating-up temperature and roll, and deforms it, and the grinding pressure of applying is 3
Ton.After rolling, weld seam is cooled to less than 150 DEG C.Heating weld seam is carried out after reaching heating-up temperature to 680 DEG C to weld seam again
Roll, the grinding pressure of applying is 3 tons.After having rolled, weld seam is air cooled to room temperature.
The Seam and heat effected zone microhardness of the continuous pipe steel band banjo fixing butt jointing processed using process above is fallen below
Less than 248, original thick weld seam is greatly improved with heat affected area tissue, and residual stress is greatly reduced.
CT80 grades of continuous pipe product being made of the docking steel band after the PROCESS FOR TREATMENT, fatigue life is up to 550-
It is 650 times, suitable with the main pipe fatigue life without butt weld.
The above, is only presently preferred embodiments of the present invention, and any formal limitation is not made to the present invention, though
So the present invention is disclosed above with preferred embodiment, but is not limited to the present invention, any to be familiar with this professional technology people
Member, without departing from the scope of the present invention, when using the method and technology contents of the disclosure above make it is a little more
Move or be modified to the Equivalent embodiments of equivalent variations, as long as being the content without departing from technical solution of the present invention, according to of the invention
Any simple modification, equivalent variations and modification that technical spirit is made to above example, still fall within technical solution of the present invention
In the range of.
Claims (9)
1. a kind of method for changing low-carbon micro steel-alloy seam organization and performance, it is characterized in that：
(1) low-carbon micro steel-alloy weld seam is heated to 820 DEG C~950 DEG C, applying external force to low-carbon micro steel-alloy weld seam becomes it
Shape；
(2) less than 150 DEG C are cooled to, low-carbon micro steel-alloy weld seam 650 DEG C~780 DEG C is heated to again, to low-carbon microalloy
Steel weld seam applies external force again is deformed it；
(3) and then it is air cooled to room temperature.
2. a kind of method for changing low-carbon micro steel-alloy seam organization and performance according to claim 1, it is characterised in that：
External force is applied to weld seam in the step (1) and step (2), external force direction is perpendicular to the mother metal where low-carbon micro steel-alloy weld seam
Surface.
3. a kind of method for changing low-carbon micro steel-alloy seam organization and performance according to claim 1, it is characterised in that：
According to mass percent, the composition of the low-carbon micro steel-alloy is：C 0.05~0.20, Si≤0.45, Mn 0.5~2.0, Cr
0.4~0.7, Ni≤0.25, Cu≤0.4, Mo≤0.25, Nb≤0.06, and P, S are limited for P≤0.02, S≤0.003, surplus
It is Fe and inevitable impurity element.
4. a kind of method for changing low-carbon micro steel-alloy seam organization and performance according to claim 1, it is characterised in that：
The low-carbon micro steel-alloy weld seam is welded institute's shape using TIG weldering+filler wires or Plasma Welding+filler wire technique
Into.
5. a kind of method for changing low-carbon micro steel-alloy seam organization and performance according to claim 4, it is characterised in that：
According to mass percent, the composition of the welding wire includes：C 0.04~0.20, Si 0.01~0.2, Mn 0.7~2.0, P≤
0.0095th, S≤0.008, Mo 0.1~0.3, Ni 0.5~1.3.
6. a kind of method for changing low-carbon micro steel-alloy seam organization and performance according to claim 1, it is characterised in that：
The step (1) is quickly servo-actuated mode of heating using Medium frequency induction, and weld seam is integrally heated, and heating-up temperature is 820 DEG C~950
DEG C, firing rate is 30~35 DEG C/sec.
7. a kind of method for changing low-carbon micro steel-alloy seam organization and performance according to claim 1, it is characterised in that：
After weld seam is air cooled to less than 150 DEG C by the step (2), second heating is carried out to weld seam, heating-up temperature is 650 DEG C~780
DEG C, firing rate is 30~35 DEG C/sec.
8. a kind of method for changing low-carbon micro steel-alloy seam organization and performance according to claim 1, it is characterised in that：
The mode for applying external force to weld seam is the mode that rolls, or forges and presses mode.
9. a kind of method for changing low-carbon micro steel-alloy seam organization and performance according to claim 1, it is characterised in that：
The size for applying external force to weld seam is 3~5 tons.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112626330A (en) * | 2020-12-26 | 2021-04-09 | 信达科创（唐山）石油设备有限公司 | Thermomechanical treatment equipment and technological method thereof |
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| CN102424906A (en) * | 2011-12-14 | 2012-04-25 | 宝鸡石油钢管有限责任公司 | Method for optimizing weld seam structure and properties of HFW(High Frequency Welded) pipes |
| CN102912108A (en) * | 2012-10-23 | 2013-02-06 | 鞍钢股份有限公司 | Heat treatment process for improving microstructure and performance of microalloyed steel weld joint |
| CN104388663A (en) * | 2014-11-21 | 2015-03-04 | 宝鸡石油钢管有限责任公司 | Thermomechanical treatment method of tube longitudinal welding seam |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112626330A (en) * | 2020-12-26 | 2021-04-09 | 信达科创（唐山）石油设备有限公司 | Thermomechanical treatment equipment and technological method thereof |
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