CN105925890B - A kind of method of improvement X90 steel grade spiral seam submerged arc welded pipe joint mechanical properties - Google Patents
A kind of method of improvement X90 steel grade spiral seam submerged arc welded pipe joint mechanical properties Download PDFInfo
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- CN105925890B CN105925890B CN201610499811.XA CN201610499811A CN105925890B CN 105925890 B CN105925890 B CN 105925890B CN 201610499811 A CN201610499811 A CN 201610499811A CN 105925890 B CN105925890 B CN 105925890B
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/08—Making tubes with welded or soldered seams
- B21C37/0807—Tube treating or manipulating combined with, or specially adapted for use in connection with tube making machines, e.g. drawing-off devices, cutting-off
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/30—Finishing tubes, e.g. sizing, burnishing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/18—Submerged-arc welding
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/30—Stress-relieving
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
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- 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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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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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
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Abstract
The invention discloses a kind of method of improvement X90 steel grade spiral seam submerged arc welded pipe joint mechanical properties, the main manufacturing procedure of this method is：The uncoiling of coiled sheet and leveling, milling side, pre-bending, shaping, interior weldering, the heat treatment of heating in medium frequency high tempering, outside weld.Heating in medium frequency high tempering heat treatment step is added in this method processing step, Welded Joints carry out eliminating the heat treatment of internal stress high tempering, effectively eliminate welding point region welding stress and roll bending deform caused by moulding stress, reduce weld seam produce solidification cracking risk；X90 Inside Welding of Spiral Submerged Arc Welded Pipe heat affected area structural state is significantly improved at the same time, improves welding point heat affected area toughness, improves the comprehensive mechanical property of welding point.
Description
Technical field
The present invention relates to a kind of spirally welded steel pipe technical field.
Background technology
Natural gas is just being increasingly subject to the attention of people as a kind of energy of high-efficiency cleaning.Since gas field is normally at
The Desert Area in remote remote market, how safety, economically by natural gas transportation to consumption market be always natural gas produce
One of pipe fitting problem of industry development.It is to reduce naturally by technological innovation and the pipeline using higher pressure and higher intensity
The most effective approach of gas long distance delivery cost.Improve the most obvious trend that discharge pressure is Gao Long-distance Transmission Pipeline development.
Natural gas line discharge pressure brought up to 14MPa between 30 years from initial 0.23MPa.The raising of discharge pressure is required using more
The pipe line steel of high intensity.Nowadays, worldwide Long-distance Transmission Pipeline build X52, X60 for being used from the past and
X65 pipe line steels develop into X70 and X80 high-strength line-pipe steels, and are developing X90~X120 ultra high-strength pipeline steels.
X90 can effectively reduce wall thickness compared with X80, so that steel using amount is saved, saving of purchase cost.According to budget, in pipe
After the bore and pressure of line determine, grade of steel often improves a grade, it is possible to reduce steel using amount about 8%~12%.With 45,000,000,000 sides/year
Exemplified by natural gas quantity, pipe design are 1219mm, compared with X80, transfering natural gas from the west to the east four lines/five line using X100 as that can reduce use
410,000 tons/760,000 tons of steel amount, saves 2,400,000,000 yuan/4,500,000,000 yuan of tubing purchase cost.
However, at home, steel mill generally adds of a relatively high microalloy member to improve the intensity of pipe line steel roll bending
Element, can make the intensity of steel plate bring up to X90 ranks using controlled rolling, control refrigeration technique, but carbon equivalent also improves therewith, causes Hi-grade steel
The solderability of pipe line steel reduces, and the appearance of the hard crisp lath martensite phase in heat affected area seriously reduces the impact of X90 heat affected areas
Toughness；Simultaneously because the intensity of coiled sheet greatly improves, welding point stress concentration is serious, becomes and restricts X90 spiral submerged arc weldeds
The bottleneck problem of pipe development.
The content of the invention
The technical problem to be solved in the present invention is in view of the above shortcomings of the prior art, there is provided one kind improves X90 grade of steel spiral shells
The method of rotation seam submerged-arc welded (SAW) pipe joint mechanical property, effectively eliminates the welding stress of welding point and roll bending after interior welder's sequence and becomes
Stress caused by shape, improves welding point heat affected area toughness, improves the comprehensive mechanical property of welding point.
In order to solve the above technical problems, the present invention adopts the technical scheme that：One kind improves X90 grade of steel spiral seam submerged arcs
The method of welded pipe joint mechanical property, the percentage composition of the X90 steel grade spiral seam submerged arc welded pipe main chemical compositions weight are：C
：0.04-0.06；Si：≤0.30；Mn：≤1.95；P：≤0.015；S：≤0.005；Cr：≤0.30；Mo：≤0.25；Ni：≤
0.25；Al：≤0.06；Cu：≤0.25；Ti：≤0.025；Nb：≤0.080；V：≤0.04；B：≤0.0005；N：≤0.008；
Remaining is Fe, wherein CEpcm：≤ 0.21, the main manufacturing procedure of this method is：1. the uncoiling of coiled sheet, leveling；2. milling side；It is 3. pre-
It is curved；4. it is molded；5. interior weldering；6. outside weld；It is characterized in that, in process 5. interior weldering and 6. addition high tempering heat treatment between outside weld
Process.
Preferably, the high tempering heat treatment step, is heating in medium frequency high tempering heat treatment step, it heats temperature
Degree control carries out high tempering at 450 DEG C -550 DEG C, to inside weld and outer groove and neighboring area, to be welded in elimination after welder's sequence
Stress caused by welding stress and the roll bending deformation of connector, improves welding point heat affected area toughness, improves welding point
Comprehensive mechanical property, while play the role of external groove preheating.
Preferably, the heating in medium frequency high tempering heat treatment step is that intermediate frequency induction heating device is positioned over distance
Interior one pitch position of solder joint, with outer solder joint distance be less than a pitch, with steel pipe carry out rolling welding, while before
Into；The contact tube of intermediate frequency induction heating device is in outer groove lower part 10mm-20mm, to inside weld, heat affected area and outer slope
Mouth heating.
Preferably, the technique of milling side process is：First rough mill rear finish-milling；Rough mill, groove type is I type grooves, is made
The wide control of plate exists：1550±5mm；Finish-milling, groove type are X-type, and retaining wall on slope size is：Outer groove depth is 4.1 ± 1 mm,
Groove bottom angle is 40 °, and internal groove depth is 4.2 ± 1 mm, and 35 ° of opening angle, root face height is 8.0 ± 1 mm.
Preferably, the technique of interior welder's sequence is：Using mariages tandem Lincoln weld：First anti-for direct current
Connect, electric current 1025-1125 A, voltage 30-34 V；Second just connects for exchange, electric current 450-550 A, voltage 34-38 V；Weldering
It is 1.25-1.35m/min to connect speed.
Preferably, the technique of outside weld process is：Using mariages tandem Lincoln weld：First is DC reverse connection, electricity
Flow 1125-1225A, voltage 31-35 V；Second just connects for exchange, electric current 450-550 A, voltage 34-38 V；Speed of welding
For 1.25-1.35 m/min.
It is using beneficial effect caused by above-mentioned technical proposal：Weldering welding stress and tube body are deformed inflexible in eliminating
Shu Yingli；On the basis of welding point internal stress is eliminated, the risk that weld seam produces solidification cracking is reduced, while also can be internal
The lath martensite that the welding heat zone of influence occurs carries out temper, its is generated tempered martensite, the welding heat zone of influence in increase
Toughness, improves the comprehensive mechanical property of welding point.Welding heat affected zone in current country's X90M welding processes has been captured to impact
There are the bottleneck problems such as discrete low value in toughness so that the comprehensive performance of welding point, which has, to be obviously improved.At intermediate frequency heat
Equipment and the upper synchronous progress of other steel pipe's production equipment work are managed, therefore steel pipe's production efficiency can't be reduced.Milling side process and
Welding condition is all based on the chemical composition of X90 steel and performance determines, has very strong practicality.
Brief description of the drawings
Fig. 1 is the principle schematic of heating in medium frequency of embodiment of the present invention high tempering heat treatment.
In figure：1st, silicon steel sheet；2nd, contact tube；3rd, electromagnetic wire；4th, inside weld；5th, outer groove；6th, steel pipe；7th, cooling water.
Embodiment
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
The percentage composition of the main chemical compositions weight of coiled sheet used in the present embodiment X90 steel grade spiral seam submerged arc welded pipes is C
：0.05；Si：0.24；Mn：1.75；P：0.0093；S：0.0003； Nb+Ti+V：0.115；Ni+Cr+Cu：0.271；Cr+Mo+
Mn：2.22；Remaining is Fe, wherein CEpcm：0.19；Ceq：0.45；The mechanical property of coiled sheet is as shown in table 1.The thickness of steel plate is
16.3mm, is finally made the steel pipe that caliber is 1219 × 16.3mm of Φ.The system of the present embodiment X90 steel grade spiral seam submerged arc welded pipes
It is as follows to make processing step：
1st, the uncoiling of coiled sheet, leveling.
2nd, butt joint；To meet the continuous production of steel-pipe welding, steel pipe need to be connected with each other using butt joint process, it is correct
Welding is：880 A of electric current, 36 V of voltage, 4.0 mm of gage of wire；Use the welding wire trade mark for：H08C；The solder flux trade mark is
SJ101G+995N；0.4 m/min of speed of welding.
3rd, milling side；
Further, milling side process is specially：First rough mill rear finish-milling.Rough mill, groove type is I type grooves, removes roll bending
Defect and crescent moon are curved, make the wide control of plate in 1550mm；Finish-milling, groove type are X-type, and retaining wall on slope size is：Outer groove depth
For 4.1mm, groove bottom angle is 40 °, and internal groove depth is 4.2mm, and 35 ° of opening angle, root face height is 8.0 mm.
4th, pre-bending：Delivering side and free margins on two roller joggling machines to roll bending carry out pre-flanging..
5th, it is molded：By the roll bending of above-mentioned pre-flanging the helical form that overall diameter is Φ 1219 will be rolled into three-roll formation device
Cylinder.
6th, interior weldering；Consider that X90 grades of roll bending alloying components are higher, interior outside weld uses mariages tandem Lincoln weld work
Skill, first needs using big welding current, relatively low arc voltage, and main function is to ensure depth of penetration；The effect of second
Mainly capping, that is, obtain good presentation quality, and weld seam is seamlessly transitted with mother metal, avoids outer surface fusion from stress collection occur
In, reduce and eliminate undercut phenomenon, it is necessary to using small welding current and higher arc voltage, with obtain good seam center and
Excellent weldquality.
Preferably, interior Welding is：First is DC reverse connection, 1075 A of electric current, 32 V of voltage, gage of wire 4.0
mm；Second just connects for exchange, 500 A of electric current, 36 V of voltage, 3.2 mm of gage of wire；Speed of welding is 1.30m/min, is adopted
It is with the welding wire trade mark：H08C；The solder flux trade mark is：SJ101G+995N.
7th, high tempering is heat-treated, and is internally welded welding point and is carried out elimination internal stress, external groove 5 is preheated.
Further, which is heating in medium frequency high tempering heat treatment step, it heats temperature
Degree control carries out high tempering at 450 DEG C -550 DEG C, to inside weld 4 and outer groove 5 and neighboring area, after welder's sequence in elimination
Stress caused by welding stress and the roll bending deformation of welding point, improves welding point heat affected area toughness, improves welding point
Comprehensive mechanical property, while play the role of external groove 5 and preheat.
Further, heating in medium frequency high tempering heat treatment step is specially：With the 6 one side rotation of X90 grade of steels steel pipe, one
Side is fed, i.e., while carrying out rolling interior weldering and outside weld, while advancing, Frequency Induction Heating fills between interior solder joint and outer solder joint
Put the inside weld 4 to steel pipe, heat affected area and outer groove 5 and carry out high tempering.Intermediate frequency induction heating device about 1 away from interior solder joint
Pitch position, with outer solder joint distance about 0.5 pitch, while it is interior weldering, outside weld and heating in medium frequency high tempering heat treatment feeding
Speed is identical to keep 1.30m/min, and the rotational velocity of X90 grade of steels steel pipe 6 is 1.30m/min, the heating-up temperature of high tempering
Control is at 450 DEG C -550 DEG C；As shown in Figure 1, intermediate frequency induction heating device contact tube 2 is in outer 5 lower part 15mm of groove, face
Outer groove 5, it is ensured that welding point position is heated.The principle of Frequency Induction Heating is by industrial 380V the three of 50HZ
Cross streams electric rectification filters, and becomes constant DC power supply, through being reverse into the single-phase mid-frequency alternating current of required frequency and voltage, then
Induction coil is transported to through transformer, according to electromagnetic induction principle, electromagnetic wire 3 induces frequency in welded tube welding seam and its near zone
The vortex that rate is identical, direction is opposite, produces vortex heat, inside weld 4, heat affected area and outer groove 5 is heated.Medium frequency induction
Silicon steel sheet 1 can strongly reduce the magnetic resistance in its residing region in heating unit, and silicon steel sheet 1 is applied to inductor (i.e. conductive copper
Pipe 2), by control magnetic flux flow move towards improve heating region Distribution of Magnetic Field, to strengthen local heating effect or into
Row is electromagnetic-field-shielded, improves the uniformity of heating spot temperature.Due to close to heated surface, contact tube 2 and silicon steel sheet 1
Also can be heated, the attribute of 1 material of contact tube 2 and silicon steel sheet can change, and influence the stability of sensing heating process, because
This 2 section of contact tube is hollow, can lead to cooling water 7.6 one side of steel pipe carries out rolling welding, while advancing, intermediate frequency heat treatment is set
Standby progress synchronous with the work of other steel pipe's production equipment, therefore increased intermediate-frequency heat treatment process does not influence production efficiency.
8th, outside weld；
Preferably, the technique is：First is DC reverse connection, 1175 A of electric current, 33 V of voltage, gage of wire 4.0
mm；Second just connects for exchange, 500 A of electric current, 36 V of voltage, 3.2 mm of gage of wire；Speed of welding is 1.30m/min.Adopt
It is with the welding wire trade mark：H08C；The solder flux trade mark is：SJ101G+995N.
9th, Pipe Cutting：For ease of storing and transporting, steel pipe is cut into by 11.0 m-12.2m length steel using plasma cutting machine
Pipe.
10th, pipe end is expanding：Carried out in the range of pipe end 300mm cold expanding, maximum expanding amount is diameter of steel tube
0.6%；Pipe end girth deviation≤3.0mm；Ovality deviation≤4.0mm.
11st, mother metal is layered and carries out ultrasonic examination and X-ray examination.
12nd, the water pressure test.
13rd, ultrasonic examination is carried out to weld seam and ultrasonic wave hand is visited.
14th, chamfered edge：The end seamed edge of steel pipe is carried out blunt.
To verify the helpfulness of the present embodiment technique, the special technique according to the present embodiment has carried out comparative example and the prior art
Experiment under technique, while to ensure unitary variant principle, coiled sheet used in the X90 steel grade spiral seam submerged arc welded pipes of comparative example
The percentage composition of main chemical compositions weight, mechanical property etc. are completely the same with embodiment, and process simply eliminates the 7th step
450 DEG C -550 DEG C of heating in medium frequency high tempering heat treatment step, other processes and work are carried out using intermediate frequency induction heating device
Skill parameter is completely the same with embodiment.After embodiment and comparative example respectively do ten groups of experiments according to respective technique, respectively to implementing
Example and impact flexibility, welding point tensile strength and the welding point bending property of comparative example welding heat affected zone are examined
Survey, obtained performance data is as shown in table 2, table 3 and table 4.
As shown in table 2, the X90 steel pipe seam average impacts work(under comparative example, that is, prior art processes is 114J, heat affecting
Area's average impact work(is 135J, but Seam and heat effected zone toughness is discrete；Seam and heat effected zone is impacted under the present embodiment technique
Work(average raises, and increases 6J and 25J respectively；And ballistic work toughness occurs without discrete low value.See, pass through in impact flexibility
Under improved new process, low value discrete phenomena disappears, and numerical value is more concentrated, and monodrome and average value are not less than 100J.This
The impact flexibility of the welding point of embodiment technique is obviously improved, and having effectively eliminated should caused by welding stress and roll bending deformation
Power.
As shown in table 3, because the reason for adding high tempering process, the welding point tensile strength of embodiment is smaller
In the welding point tensile strength of comparative example, but it is still much full using the X90 Steel Welded Joints tensile strength of embodiment technique
Foot《Natural-gas transfer pipeline X90 steel grade spiral seam submerged arc welded pipe technical conditions》It is required that.
As shown in table 4, the welding point bending property of embodiment all meets《Natural-gas transfer pipeline X90 grade of steel spiral shells
Rotation seam submerged-arc welded (SAW) pipe technical conditions》It is required that the one of which welding point bending property of comparative example fails to meet《Natural gas transportation
Pipeline X90 steel grade spiral seam submerged arc welded pipe technical conditions》It is required that relative to the technique of comparative example, that is, prior art, using reality
It is more reliable and more stable to apply the X90 Steel Welded Joint bending properties of a technique, has effectively eliminated welding stress and roll bending deformation
Caused stress.
In conclusion the beneficial effect using above the present embodiment technique：Welding heat zone of influence toughness in increase, improves welding
The comprehensive mechanical property of connector, it is discrete to have captured impact flexibility appearance in welding heat affected zone in current country's X90M welding processes
The bottleneck problems such as low value so that the comprehensive performance of welding point, which has, to be obviously improved, and the intermediate frequency high tempering heat newly increased
Treatment process does not influence production efficiency.
1 roll bending of table（30 ° of rolling direction）Tension test value
2 embodiment of table and the impact flexibility of comparative example welding heat affected zone
The welding point tensile strength of 3 embodiment of table and comparative example
The welding point bending property of 4 embodiment of table and comparative example
Claims (4)
1. a kind of method of improvement X90 steel grade spiral seam submerged arc welded pipe joint mechanical properties, the X90 steel grade spiral seam submerged arc welded pipes
The percentage composition of main chemical compositions weight is：C：0.04-0.06；Si：≤0.30；Mn：≤1.95；P：≤0.015；S：≤
0.005；Cr：≤0.30；Mo：≤0.25；Ni：≤0.25；Al：≤0.06；Cu：≤0.25；Ti：≤0.025；Nb：≤
0.080；V：≤0.04；B：≤0.0005；N：≤0.008；Remaining is Fe, wherein CEpcm：≤ 0.21, this method is mainly processed
Process is：1. the uncoiling of coiled sheet, leveling；2. milling side；3. pre-bending；4. it is molded；5. interior weldering；6. outside weld；It is characterized in that, in process
5. interior weldering and 6. addition high tempering heat treatment step between outside weld；The high tempering heat treatment step, is that heating in medium frequency is high
Warm tempering heat treatment process, its heating and temperature control carry out inside weld and outer groove and neighboring area high at 450 DEG C -550 DEG C
Temperature tempering, with stress caused by the welding stress of welding point after welder's sequence in elimination and roll bending deformation, improves welding point heat
Zone of influence toughness, improves the comprehensive mechanical property of welding point, while plays the role of external groove preheating；The heating in medium frequency
High tempering heat treatment step is that intermediate frequency induction heating device is positioned over apart from interior one pitch position of solder joint, with outer weld spacing
From less than one pitch, as steel pipe carries out rolling welding, while advancing；At the contact tube of intermediate frequency induction heating device
In outer groove lower part 10mm-20mm, inside weld, heat affected area and outer groove are heated.
2. improve the method for X90 steel grade spiral seam submerged arc welded pipe joint mechanical properties as claimed in claim 1, it is characterised in that
The technique of milling side process is：First rough mill rear finish-milling；
Rough mill, groove type is I type grooves, the wide control of plate is existed：1550±5mm；
Finish-milling, groove type are X-type, and retaining wall on slope size is：Outer groove depth is 4.1 ± 1mm, and groove bottom angle is 40 °,
Internal groove depth is 4.2 ± 1mm, and 35 ° of opening angle, root face height is 8.0 ± 1mm.
3. improve the method for X90 steel grade spiral seam submerged arc welded pipe joint mechanical properties as claimed in claim 1, it is characterised in that
The technique of interior welder's sequence is：Using mariages tandem Lincoln weld：First is DC reverse connection, electric current 1025-1125A,
Voltage 30-34V；Second just connects for exchange, electric current 450-550A, voltage 34-38V；Speed of welding is 1.25-1.35m/min.
4. improve the method for X90 steel grade spiral seam submerged arc welded pipe joint mechanical properties as claimed in claim 1, it is characterised in that
The technique of the outside weld process is：Using mariages tandem Lincoln weld：First is DC reverse connection, electric current 1125-1225A,
Voltage 31-35V；Second just connects for exchange, electric current 450-550A, voltage 34-38V；Speed of welding is 1.25-1.35m/min.
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Citations (5)
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|---|---|---|---|---|
| EP0407175A1 (en) * | 1989-07-06 | 1991-01-09 | Kawasaki Steel Corporation | Method of conducting circumferential welding of electric welded steel line pipe to be laid by reel barge |
| JP2002146471A (en) * | 2000-11-07 | 2002-05-22 | Nippon Steel Corp | Ultrahigh strength steel plate and ultrahigh strength steel pipe each having excellent toughness at low temperature and toughness in heat-affected zone, and their manufacturing method |
| JP4336294B2 (en) * | 2004-11-16 | 2009-09-30 | 新日本製鐵株式会社 | Manufacturing method of high strength steel pipe for pipelines with excellent deformation characteristics after aging |
| CN101886222A (en) * | 2010-07-05 | 2010-11-17 | 华油钢管有限公司 | Method for manufacturing high-strength X90 steel grade spiral submerged arc welded pipe |
| WO2015004901A1 (en) * | 2013-07-09 | 2015-01-15 | Ｊｆｅスチール株式会社 | Thick-walled electric resistance welded steel pipe for line pipe, and method for manufacturing said steel pipe |
-
2016
- 2016-06-30 CN CN201610499811.XA patent/CN105925890B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0407175A1 (en) * | 1989-07-06 | 1991-01-09 | Kawasaki Steel Corporation | Method of conducting circumferential welding of electric welded steel line pipe to be laid by reel barge |
| JP2002146471A (en) * | 2000-11-07 | 2002-05-22 | Nippon Steel Corp | Ultrahigh strength steel plate and ultrahigh strength steel pipe each having excellent toughness at low temperature and toughness in heat-affected zone, and their manufacturing method |
| JP4336294B2 (en) * | 2004-11-16 | 2009-09-30 | 新日本製鐵株式会社 | Manufacturing method of high strength steel pipe for pipelines with excellent deformation characteristics after aging |
| CN101886222A (en) * | 2010-07-05 | 2010-11-17 | 华油钢管有限公司 | Method for manufacturing high-strength X90 steel grade spiral submerged arc welded pipe |
| WO2015004901A1 (en) * | 2013-07-09 | 2015-01-15 | Ｊｆｅスチール株式会社 | Thick-walled electric resistance welded steel pipe for line pipe, and method for manufacturing said steel pipe |
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| CN105925890A (en) | 2016-09-07 |
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Inventor after: Liu Zhenwei Inventor after: Wang Yu Inventor after: Lou Gang Inventor after: Tian Peng Inventor after: Sun Zhigang Inventor after: Li Guopeng Inventor after: Lu Guangping Inventor after: Chen Song Inventor after: Tang Yaoyao Inventor after: Cui Mingliang Inventor after: Zhu Yu Inventor before: Liu Zhenwei Inventor before: Tian Peng Inventor before: Sun Zhigang Inventor before: Lu Guangping Inventor before: Chen Song Inventor before: Tang Yaoyao Inventor before: Cui Mingliang Inventor before: Wang Yu Inventor before: Lou Gang |
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Effective date of registration: 20201029 Address after: 100007 Beijing, Dongzhimen, North Street, No. 9, No. Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CNPC BOHAI EQUIPMENT MANUFACTURING Co.,Ltd. Patentee after: NORTH CHINA PETROLEUM STEEL PIPE Co.,Ltd. Address before: 300457 Tianjin city Grand Port North Road in the middle in Dagang Oilfield in Hong Kong Patentee before: CNPC BOHAI EQUIPMENT MANUFACTURING Co.,Ltd. Patentee before: NORTH CHINA PETROLEUM STEEL PIPE Co.,Ltd. |
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