CN108048747A - A kind of Hi-grade steel bend pipe and preparation method - Google Patents
A kind of Hi-grade steel bend pipe and preparation method Download PDFInfo
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- CN108048747A CN108048747A CN201810091176.0A CN201810091176A CN108048747A CN 108048747 A CN108048747 A CN 108048747A CN 201810091176 A CN201810091176 A CN 201810091176A CN 108048747 A CN108048747 A CN 108048747A
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- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/08—Bending rods, profiles, or tubes by passing between rollers or through a curved die
-
- 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
- C21D1/06—Surface hardening
- C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
- C21D1/10—Surface hardening by direct application of electrical or wave energy; by particle radiation by electric induction
-
- 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
- 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
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
- C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- 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
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- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- 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
- C22C38/40—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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- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- 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
- C22C38/40—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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- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The present invention provides a kind of yield strength reach 555MPa and more than Hi-grade steel bend pipe preparation method.The described method includes：Control the chemical composition and mechanical property of main pipe；The first straight pipe, tune to be curved and the second straight pipe are chosen in main pipe, bending section is treated using the annular-heating band for setting width to be heated, and treat bending section and carry out bending machining to form the bending section of the bend pipe, the part for completing bending machining is cooled down；High tempering processing is carried out to bend pipe after cutting, obtains the Hi-grade steel bend pipe being made of bending section and first straight pipe at bending section both ends, the second straight pipe.The energy consumption (electricity consumption and with water) more than 35% of bend pipe manufacture can be saved according to the method for the present invention, can be reduced bend pipe production cost more than 30%, can be improved bend pipe production efficiency more than 180%.The high guiding principle grade bend pipe of the present invention is suitable for the transport pipeline as oil, natural gas.
Description
Technical field
The invention belongs to bend pipe manufacturing fields, more particularly, are related to a kind of chemical composition and power by controlling main pipe
Performance is learned, the method that type technique manufacture Hi-grade steel bend pipe is simmered into using local heating.
Background technology
At present, yield strength reach 555MPa and more than Hi-grade steel main pipe and its weld seam heating properties due to, only
By temper, straight pipe intensity, transition region intensity and weld metal zone impact property can decrease, therefore, general using complete
Journey heating process manufactures, to ensure that straight pipe performance, transition region performance are consistent with bending section performance.But whole heating process
It is higher by than the energy consumption of local heating technique very much, therefore, production cost will be higher by very much, meanwhile, production efficiency also pole
It is low.At the same time, every bend pipe is required for the technique short circuit of one more than 500mm length of welding (to have in whole heating process
Body length is depending on fixture), which can also increase the input of human and material resources and time, also can increase bend pipe production cost simultaneously
Reduce bend pipe production efficiency.
Therefore, bent there is an urgent need for a kind of chemical composition and mechanical property by controlling main pipe and using the manufacture of local heating technique
Take intensity reach 555MPa and more than Hi-grade steel bend pipe and can guarantee the method that bend pipe properties are met the requirements.
The content of the invention
For problems of the prior art, it is an object of the invention to solve in deficiencies of the prior art
At least one of.For example, it is an object of the present invention to propose a kind of chemical composition and mechanical property by controlling main pipe
And the Hi-grade steel method for manufacturing bent pipe of type is simmered into using local heating, yield strength can be manufactured by this method and reached
555MPa and more than Hi-grade steel bend pipe, and energy saving can consume, reduce bend pipe production cost, improve bend pipe production effect
Rate, while can ensure that the property indices of bend pipe can be met the requirements again.
For example, another object of the present invention is to propose a kind of chemical composition and mechanical property by controlling main pipe and adopt
With local heating be simmered into the yield strength that type technique manufactures reach 555MPa and more than Hi-grade steel bend pipe.
To achieve these goals, one aspect of the present invention proposes a kind of Hi-grade steel bend pipe preparation method.The preparation side
Method includes：
Control C as mass fraction：0.05~0.09%, Mn：1.50~1.80%, Si：0.10~0.30%, Cu：
Less than 0.3%, Cr：Less than 0.3%, Mo：0.15~0.30%, Ni：0.15~0.50%, V：Less than 0.06%, B：
Less than 0.0005%, P：Less than 0.015%, S：Less than 0.005%, Nb：0.04~0.08%, Ti：Less than 0.025%, Al：
Less than 0.06%, N：Less than 0.008%, remaining is the main pipe ingredient of Fe and inevitable impurity, and the ingredient of the main pipe is also
Meet C+Si/30+ (Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B less than 0.22%.
The first straight pipe, tune to be curved and the second straight pipe are chosen in main pipe, utilizes the annular-heating for setting width
Band is treated bending section and is heated, and treats bending section and carry out bending machining to form the bending section of the bend pipe, curved to completing
The part of Qu Jiagong is cooled down.
High tempering processing is carried out to bend pipe after cutting, obtain by bending section and first straight pipe at bending section both ends,
The Hi-grade steel bend pipe that second straight pipe is formed.
To achieve these goals, another aspect of the present invention proposes a kind of Hi-grade steel bend pipe.The bend pipe is by bending section
And bending section both ends the first straight pipe and the second straight pipe form, the main pipe of the bend pipe has following ingredient, by quality
Fraction meter C：0.05~0.09%, Mn：1.50~1.80%, Si：0.10~0.30%, Cu：Less than 0.3%, Cr：0.3% with
Under, Mo：0.15~0.30%, Ni：0.15~0.50%, V：Less than 0.06%, B：Less than 0.0005%, P：Less than 0.015%,
S：Less than 0.005%, Nb：0.04~0.08%, Ti：Less than 0.025%, Al：Less than 0.06%, N：0.008%, remaining is Fe
With inevitable impurity, the ingredient of the main pipe also meets C+Si/30+ (Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+
5B is less than 0.22%.
In one exemplary embodiment of the present invention, the yield strength of the main pipe can be more than 600MPa, weld seam
Impact property can be more than 150J.
In one exemplary embodiment of the present invention, the temperature that the heating tape is heated can be 980~1020
DEG C, the speed of heating can be 400~500 DEG C/min, and heating bandwidth can be 30~40mm.
In one exemplary embodiment of the present invention, the rate of bending of the bending machining can be 20~30mm/
min。
In one exemplary embodiment of the present invention, industrial clean water may be employed in the cooling, and cooling water flow can
Think 40~44m3/ h, cooling water temperature can be 15~30 DEG C.
In one exemplary embodiment of the present invention, the high tempering can include at 500~600 DEG C of overall thermals
Reason, directly comes out of the stove after can keeping the temperature 60~80min, can be cooled to room temperature with being more than the cooling velocity of 150 DEG C/h.
In one exemplary embodiment of the present invention, the radius of curvature of the bend pipe can be not less than the main pipe outer diameter
5 times, bending angle can be 8~90 °.
In one exemplary embodiment of the present invention, the yield strength of the main pipe can be more than 600MPa, weld seam
Impact property can be more than 150J.
In one exemplary embodiment of the present invention, the bend pipe bore can be 813~1422mm.
Compared with prior art, beneficial effects of the present invention include：Main pipe selects the chemical composition combination of particular components, and
And rational tensile and impact properties requirement is formulated, it can ensure the ingredient and performance design of local heating；Using local heating
Stewing mode simmers technological parameter and heat treatment process parameter processed by controlling, enables to straight pipe, transition region and bending section
Property indices can be met the requirements；Compared to whole heating process, the successful research and development application of local heating technique can save
The energy consumption (electricity consumption and with water) more than 35% of bend pipe production, can reduce bend pipe production cost more than 30%, can improve
Bend pipe production efficiency more than 180%.
Description of the drawings
By the description carried out below in conjunction with the accompanying drawings, above and other purpose of the invention and feature will become more clear
Chu, wherein：
Fig. 1 shows the signal of the process of an exemplary embodiment of the Hi-grade steel bend pipe preparation method of the present invention
Figure.
The reference numerals are as follows：
Straight pipe 8- shakes before straight pipe 5- induction coil 6- bending sections 7- after 1- tailstock 2- steel pipe 3- directive wheels 4-
Arm.
Specific embodiment
Hereinafter, a kind of Hi-grade steel bend pipe preparation method that the present invention will be described in detail will be carried out with reference to exemplary embodiment,
The bore of bend pipe prepared according to the methods of the invention can be 813~1422mm.
More particularly, in existing technology, for yield strength reach 555MPa and more than bend pipe using
The process of whole process heating is manufactured, and energy consumption is huge.The bend pipe preparation method of the present invention can be by main pipe
Study point and the control of mechanical property and the adjustment of heating parameters and heat treatment parameter, can by the bending section to bend pipe into
The technique of row local heating prepares the Hi-grade steel bend pipe that yield strength is more than 600MPa, energy saving can consume, reduces bend pipe
Production cost improves bend pipe production efficiency, while can ensure that the property indices of bend pipe can be met the requirements again.
A kind of Hi-grade steel bend pipe preparation method according to an exemplary embodiment of the present invention may include steps of：
Step (1), the control of main pipe chemical composition and mechanical property.In order to ensure local heating back elbow straight pipe and mistake
It is stable, it is necessary to chemical composition, tensile property and the impact flexibility of main pipe strictly be controlled, so that bend pipe properties to cross area's performance
Index is more preferably realized.It is combined by the chemical composition for controlling particular components, formulates rational tensile and impact properties requirement, to protect
Demonstrate,prove the ingredient and performance design of local heating.It is specific as follows：
1. main pipe chemical Composition Control.Main pipe needs the important solid solution alloy elemental compositions such as stringent control Cr, Ni, Mo, excellent
Selection of land, 0.35%≤Cr+Ni+Mo≤0.9%, while need to control P, S content and other chemical compositions, the specific following institute of ingredient
Show：C：0.05~0.09%, Mn：1.50~1.80%, Si：
0.10~0.30%, Cu：Less than 0.3%, Cr：Less than 0.3%, Mo：0.15~0.30%, Ni：0.15~
0.50%th, V：Less than 0.06%, B：Less than 0.0005%, P：Less than 0.015%, S：Less than 0.005%, Nb：0.04~
0.08%th, Ti：Less than 0.025%, Al：Less than 0.06%, N：Less than 0.008%, remaining is Fe and inevitable impurity.
The ingredient of main pipe also meets C+Si/30+ (Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B less than 0.22%.
In addition, the ingredient of main pipe may be controlled to：C：0.065~0.75%, Mn：1.60~1.70%, Si：0.18~0.25%, Cu：
0.1~0.2%, Cr：0.1~0.2%, Mo：0.19~0.24%, Ni：0.25~0.40%, V：0.01~0.04%, B：
0.0001%~0.0003%, Nb：0.055~0.072%, Ti：0.010~0.020%, Al：0.02%~0.04%.
2. tensile property controls.Inventor it has been investigated that：It, need to be by main pipe in order to meet the requirements straight pipe yield strength
The yield strength of material is improved to more than 600MPa, and tensile strength is improved to more than 600MPa, and yield tensile ratio is controlled below 0.94.
3. impact flexibility controls.Inventor it has been investigated that：In order to which the weld dimensions impact property for making bend pipe expires
The impact property (for example, Charpy-V impact power) of main pipe weld seam need to be required to improve to more than 150J by foot requirement.
Step (2), Frequency Induction Heating simmer system.The first straight pipe, tune to be curved and the second straight tube are chosen in main pipe
Section is, it is necessary to which explanation, the first straight pipe can be any one section in two sections of straight pipes at bending section both ends, the second straight pipe
It can be the straight pipe in addition to the first straight pipe.Bending section can be treated using the annular-heating band for setting width to be added
Heat, for example, Frequency Induction Heating may be employed, the Frequency Induction Heating system of simmering can be by 380V, 50Hz three-phase alternating current electric rectifications
Filtering, becomes constant DC power supply, becomes 500V, the single-phase mid-frequency alternating current of l000Hz, then quenched transformer through inversion
Induction coil is transported to, according to electromagnetic induction principle, the vortex that frequency is identical, direction is opposite is induced in steel pipe, generates whirlpool
Fuel factor is flowed, a narrow annular-heating band is formed in steel pipe circumference, while steel pipe movement, can continue it curved
It is bent.In order to enable the property indices of straight pipe, transition region and bending section can be met the requirements, it is necessary to which strictly work processed is simmered in control
Skill parameter.Wherein, the frequency of Frequency Induction Heating can be 700~900Hz, since IF frequency affects the thickness of quenching layer
Degree, can obtain that surface strength is higher, and center toughness is preferably organized in the frequency band.Firing rate can be 400~500 DEG C/
Min, for example, 450 ± 10 DEG C/min.By firing rate control in the range of 400~500 DEG C/min, the tissue of obtained tube body
Preferably, grain size is uniform, and the tissue obtained after Q-tempering is mostly granular bainite microstructure, the tissue intensity higher toughness compared with
It is good.Firing rate can cause bainite structure crystal grain to increase higher than 500 DEG C/min, and intensity and toughness are aggrieved, and firing rate is low
Tissue is obtained with regard to different in 400 DEG C/min, can reduce intensity.Heating temperature can be 980~1020 DEG C, for example, 1000
±5℃.By heating and temperature control in 980~1020 DEG C of scopes, the tissue of obtained tube body is preferable, and grain size is uniform, quenches back
The tissue obtained after fire is mostly granular bainite microstructure, and the tissue intensity higher toughness is preferable.In addition, if heating temperature is higher than
After 1020 DEG C, it would be possible to bainite structure coarse grains can be caused, when crystal grain is grown up to a certain extent, intercrystalline combination power will
Weaken, cause the destruction of intensity and toughness；It is more in the metallographic structure obtained after Q-tempering if heating temperature is less than 980 DEG C
For polygonal ferrite tissue and a small amount of pearlitic structrure and bainite structure, the tissue intensity is relatively low, and toughness is preferable, it is impossible to full
Sufficient intensity requirement.It can be 30~40mm to heat bandwidth, for example, 35 ± 2mm.If it is more than 40mm to heat bandwidth, in high temperature
The residence time in area is with regard to longer, while heating tape elevated temperature strength is relatively low, and fold is easily formed in main pipe moving process；Heat bandwidth
Degree just needs to reduce less than 30mm, then width of induction coil.For example, in the case where cooling water flows out at induction coil, sense
It answers water yield in coil that can then reduce therewith, the water needed for cooling is not achieved, while bending needs the powered of bigger, makes
It is mismatched into power and bending process.
Bending machining is carried out during treating bending section and being heated while in an appropriate manner to form bend pipe
Bending section, rate of bending can be 20~30mm/min, for example, 25 ± 2mm/min.If rate of bending is slower, high-temperature residence
Time is longer, and crystal grain is easily grown up, and speed or relatively slow, can all cause that bending section fold is apparent, and the bulge of Qi Wan areas is bright
It is aobvious, cause Appearance quality defect.The radius of curvature of bend pipe after the completion of bending machining is not less than 5 times of main pipe outer diameter, generally
5D~6D, bending angle are 8~90 °, and both ends can carry 500mm long straight pipes, be welded convenient for field assembly.In bending machining
During, the coolant that the part for completing bending machining may be employed predetermined amount of flow and temperature cools down, and sensing adds
The manufacturing process of hot-bending pipe can be cooled down in heating, for example, perforate can spray water on induction coil, be equivalent to quenched
Journey, allows steel pipe tissue austenitizing, then carries out water cooling and obtain quenching structure, and temper is to improve the process of tissue, for example, cold
But liquid can be industrial clean water, and coolant rate can be 40~44m3/ h, coolant temperature can be 15~30 DEG C.Using
The advantages of local heating technique, is that straight pipe needs not move through heating, and without welding procedure pipe nipple, save the plenty of time and into
This, while technological parameter processed can be simmered by controlling so that straight pipe, transition region, the property indices of bending section are equal can be full
Foot requirement.
Step (3), heat treatment.Bulk heat treatmet is carried out to bend pipe after cutting, heat treatment mode can be high tempering work
Skill, in order to stress is reduced, crystal grain thinning obtains better strength and toughness matching, reduces intensity, improve toughness, for example,
It is specifically as follows 500~600 DEG C of (for example, 550 ± 10 DEG C) bulk heat treatmets, after keeping the temperature 60~80min (for example, 70 ± 5 DEG C)
It directly comes out of the stove and is cooled to room temperature, cooling velocity can be 150 DEG C/more than h.Here, soaking time is preferably controlled 60~80min's
In the range of, if soaking time is too short, it is tempered insufficient, nonuniform organization；If soaking time is longer, crystal grain is gradually grown up, shadow
Ring intensity and toughness.It is horizontal that the impact flexibility of weld seam can be retained using the cooling velocity of 150 DEG C/more than h, avoid reducing weld seam
Impact property, so as to ensure that weld impingement performance and integral strength are not suffered a loss.For example, it is also possible to using being air-cooled to room temperature.It is logical
Control heat treatment process parameter is crossed to obtain so that straight pipe, transition region, the property indices of bending section can be met the requirements
To the Hi-grade steel bend pipe being made of the first straight pipe, the second straight pipe of bending section and bending section both ends.It should be noted that
It can also carry out the processing of pipe end slope-mouth according to the rules before the heat treatment, derusting by sandblasting, nothing can be carried out after the heat treatment
Detection, Physico-chemical tests, appearance and physical dimension inspection and packaging are damaged, finally obtains bend pipe finished product.
Fig. 1 shows the signal of the process of an exemplary embodiment of the Hi-grade steel bend pipe preparation method of the present invention
Figure.As shown in Figure 1, in the feeding process of main pipe, main pipe 2 is first put in tailstock 1 with before directive wheel 3, keeping and 8 water of rocking arm
Concordant flat, tailstock 1 moves forward, and making main pipe 2, preceding straight pipe 7 enters in rocking arm fixture 8, locks folder by Medium frequency induction coil 5
Head.After the local heating of the preparation method of the present invention simmers system processing, obtain by preceding straight pipe 7, bending section 6 and rear straight pipe 4
The high guiding principle grade bend pipe formed.The high guiding principle grade bend pipe of the present invention is suitable for the transport pipeline as oil, natural gas.
In conclusion being combined by the chemical composition of raw material selection particular components, rational stretching and impact are formulated
It can require, it is ensured that the ingredient and performance design of local heating；Mode processed is simmered using local heating, simmers technique processed by controlling
Parameter and heat treatment process parameter so that straight pipe, transition region, the property indices of bending section can be met the requirements；It is local
Heating process can save the energy consumption (electricity consumption and with water) more than 35% of bend pipe manufacture compared to whole heating process, can
Bend pipe production cost more than 30% is reduced, bend pipe production efficiency more than 180% can be improved.
Although attached drawing is had been combined above and exemplary embodiment describes the present invention, those of ordinary skill in the art
It will be apparent to the skilled artisan that in the case where not departing from spirit and scope by the claims, above-described embodiment can be carry out various modifications.
Claims (10)
1. a kind of Hi-grade steel bend pipe preparation method, which is characterized in that the preparation method includes：
Control C as mass fraction：0.05~0.09%, Mn：1.50~1.80%, Si：0.10~0.30%, Cu：0.3% with
Under, Cr：Less than 0.3%, Mo：0.15~0.30%, Ni：0.15~0.50%, V：Less than 0.06%, B：Less than 0.0005%,
P：Less than 0.015%, S：Less than 0.005%, Nb：0.04~0.08%, Ti：Less than 0.025%, Al：Less than 0.06%, N：
Less than 0.008%, remaining is the main pipe ingredient of Fe and inevitable impurity, and the ingredient of the main pipe also meets
C+Si/30+ (Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B is less than 0.22%；
The first straight pipe, tune to be curved and the second straight pipe are chosen in main pipe, utilizes the annular-heating band pair for setting width
Tune to be curved is heated, and is treated bending section and carried out bending machining to form the bending section of the bend pipe, is added to completing bending
The part of work is cooled down；
High tempering processing is carried out to bend pipe after cutting, is obtained by bending section and first straight pipe at bending section both ends, second
The Hi-grade steel bend pipe that straight pipe is formed.
2. Hi-grade steel bend pipe preparation method according to claim 1, which is characterized in that the yield strength of the main pipe is
More than 600MPa, the impact property of weld seam is more than 150J.
3. Hi-grade steel bend pipe preparation method according to claim 1, which is characterized in that the temperature that the heating tape is heated
It spends for 980~1020 DEG C, the speed of heating is 400~500 DEG C/min, and heating bandwidth is 30~40mm.
4. Hi-grade steel bend pipe preparation method according to claim 1, which is characterized in that the rate of bending of the bending machining
For 20~30mm/min.
5. Hi-grade steel bend pipe preparation method according to claim 1, which is characterized in that the cooling is clean using industry
Water, cooling water flow are 40~44m3/ h, cooling water temperature are 15~30 DEG C.
6. Hi-grade steel bend pipe preparation method according to claim 1, which is characterized in that the high tempering include 500~
600 DEG C of bulk heat treatmets are directly come out of the stove after keeping the temperature 60~80min, are cooled to room temperature with the cooling velocity for being more than 150 DEG C/h.
7. a kind of Hi-grade steel bend pipe, which is characterized in that the bend pipe by bending section and first straight pipe at bending section both ends and
Second straight pipe is formed, and the main pipe of the bend pipe has following ingredient, as mass fraction C：0.05~0.09%, Mn：1.50
~1.80%, Si：0.10~0.30%, Cu：Less than 0.3%, Cr：Less than 0.3%, Mo：0.15~0.30%, Ni：0.15~
0.50%th, V：Less than 0.06%, B：Less than 0.0005%, P：Less than 0.015%, S：Less than 0.005%, Nb：0.04~
0.08%th, Ti：Less than 0.025%, Al：Less than 0.06%, N：0.008%, remaining is Fe and inevitable impurity, the mother
The ingredient of pipe also meets C+Si/30+ (Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B less than 0.22%.
8. Hi-grade steel bend pipe according to claim 7, which is characterized in that the radius of curvature of the bend pipe is not less than the mother
5 times of pipe outside diameter, bending angle are 8~90 °.
9. Hi-grade steel bend pipe according to claim 7, which is characterized in that the yield strength of the main pipe for 600MPa with
On, the impact property of weld seam is more than 150J.
10. Hi-grade steel bend pipe according to claim 7, which is characterized in that the bend pipe bore is 813~1422mm.
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