CN1157768A - Fabrication method of welded steel pipe using dual-phase stainles steel - Google Patents

Fabrication method of welded steel pipe using dual-phase stainles steel Download PDF

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Publication number
CN1157768A
CN1157768A CN96119786A CN96119786A CN1157768A CN 1157768 A CN1157768 A CN 1157768A CN 96119786 A CN96119786 A CN 96119786A CN 96119786 A CN96119786 A CN 96119786A CN 1157768 A CN1157768 A CN 1157768A
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Prior art keywords
welding
still less
stainless steel
open tube
laser beam
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CN96119786A
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盐崎毅
小野守章
大村雅纪
长滨裕
佐藤昭夫
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Nippon Steel Corp
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Nippon Steel Corp
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Publication of CN1157768A publication Critical patent/CN1157768A/en
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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
    • 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
    • B21C37/0811—Tube treating or manipulating combined with, or specially adapted for use in connection with tube making machines, e.g. drawing-off devices, cutting-off removing or treating the weld bead
    • 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
    • B21C37/083—Supply, or operations combined with supply, of strip material
    • 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
    • B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
    • B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
    • 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
    • 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
    • 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
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/04—Tubular or hollow articles
    • B23K2101/06—Tubes
    • 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
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/02—Iron or ferrous alloys
    • B23K2103/04—Steel or steel alloys
    • B23K2103/05—Stainless steel

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Laser Beam Processing (AREA)
  • Heat Treatment Of Articles (AREA)
  • Arc Welding In General (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Control Of Resistance Heating (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Abstract

A fabrication method of welded steel pipe using dual-phase stainless steel, comprises the steps of preparing a hot-rolled dualphase stainless steel plate containing 0.03 wt.% or less C, 1 wt.% or less Si, 0.8 to 2.0 wt.% Mn, 0.03 wt.% or less P, 0.01 wt.% or less S, 20 to 30 wt.% Cr, 2.5 to 4 wt.% Mo, 4 to 7 wt.% Ni, 0.08 to 0.2 wt.% N and the balance essentially Fe. Forming said hot-rolled steel plate continuously into an open pipe using multistage forming rolls. Welding both edges of the open pipe facing each other while upsetting by laser radiated heat. Grinding the portion that increased in plate thickness on the welded part. Applying solid solution treatment to the welded part at a temperature range of from 950 to 1100 DEG C for 30 to 300 sec of holding time. The invention also provides a method in which welded part by a laser beam and applying the aforedescribed solid solution treatment to the welded part.

Description

Make the method for welded still pipe with two phase stainless steel
The present invention relates to a kind of method, particularly use laser welding method with two phase stainless steel manufacturing welded pipe.
Two phase stainless steel by ferritic phase and austenite phase composition is applied to chemical enterprise, pipeline, oil well pipe or the like as a kind of good anticorrosive steel.Can strengthen corrosion resistance in the environment that comprises chlorion and carbon dioxide by the content of controlling Cr, Ni, Mo and N in this type of steel.The yield stress of these type of steel and hot strength are higher than austenitic stainless steel and ferritic stainless steel.
In a kind of existing continuous tube forming technology, the manufacturing of welded still pipe is to be that tubulose welds its opposite side again by forming forming roll with one with the steel band roll-forming.This technology relatively is suitable for making welded pipe with two phase stainless steel.
Welding method in the above-mentioned technology can be that melting welding such as TIG weld, plasma welding or submerged-arc welding, or the pressurization welding is as electric resistance welding (ERW).
In general, melting welding seldom produces weld defect and good solderability is arranged.But melting welding is because speed of welding is low thereby productivity ratio is low.
The speed of welding of submerged-arc welding is higher, because of this method allows to carry out big hot input quantity welding.But submerged-arc welding is owing to use the powder solder flux to cause that inevitably consequently the welding position has oxide and nitride to separate out, and its toughness is descended such as in gases such as O, the N intrusion steel in air.In addition, submerged-arc welding is because hot input quantity is big, and heat cracking produces frequency and improves.
Toughness descends and can improve to reduce the welding position oxygen content by adopting the strong basicity solder flux.Adopt the strong basicity solder flux,, also can improve corrosion resistance because solder flux improves the concentration of element random distribution that can be used as the spot corrosion starting point.
But the strong basicity solder flux is unfavorable for improving speed of welding because its fusing point is higher.In addition, the strong basicity solder flux is easy to introduce such as slag inclusion or undercut weld defects such as (fusing position depressions).
On the other hand, adopt pressurization welding method (or seam weldering) the productivity ratio melting welding height of resistance heated or eddy-current heating.But the seam weldering is easy to form oxide because of heating in the welding process on the composition surface, produce weld defect.Especially two phase stainless steel can be separated out the oxide such as Cr, Si or Mn etc.These oxides may be retained in the welding position becomes defective, because of its fusing point than matrix height, these defectives are referred to as burning, the toughness of welding position and corrosion resistance just descend like this.
In the seam weldering, faying face will pressurize when welding, thereby the welding position a thicker part occurs because of plastic deformation (flow of metal rising).Though should all carry out machined usually in the part, machined makes non-metallic inclusion be exposed to the surface of pipe, and its toughness and corrosion resistance are descended.
In general, mechanical characteristic is toughness especially, and the direction that is parallel to surface of steel plate in the direction ratio perpendicular to surface of steel plate is poor.Therefore, the joint portion flow of metal raises and makes the direction perpendicular to surface of steel plate meet at right angles with respect to tubing garden side face, causes the reduction of toughness.
The purpose of this invention is to provide a kind of method that has the welded still pipe of excellent in toughness and corrosion resistance with high production rate with the two phase stainless steel manufacturing.
For achieving the above object, adopted a kind of method with two phase stainless steel manufacturing welded still pipe, this method comprises the steps:
(a) produce a kind of hot rolling two-phase stainless steel plate, contain: by weight, 0.03% or C still less, 1% or Si still less, 0.8 Mn to 2.0%, 0.03% or P still less, 0.01% or S still less, 20 to 30% Cr, 2.5 Mo to 4%, 4 to 7% Ni, 0.08 to 0.2% N, all the other are Fe substantially;
(b) with the multistep format roll with hot rolled steel plate continuously shaped be open tube;
(c) weld with method of laser welding both sides that open tube is relative in upset;
(d) part of the thick increase of welding positioning plate is carried out grinding; And
(e) welding position is carried out 950 to 1100 ℃ of temperature ranges, 30 to 300 seconds solution treatment of temperature retention time.
Step below preferably between step (b) and step (c), inserting:
(f) being heated by resistive method heats the relative both sides of open tube.
Goal of the invention also can be by adopting another kind of method realization of making welded still pipe with two phase stainless steel, and this method comprises the steps:
(a) produce a kind of hot rolling two-phase stainless steel plate, comprise: by weight, 0.03% or C still less, 1% or Si still less, 0.8 Mn to 2.0%, 0.03% or P still less, 0.01% or S still less, 20 to 30% Cr, 2.5 Mo to 4%, 4 to 7% Ni, 0.08 to 0.2% N, all the other are Fe substantially;
(b) with the multistep format roll with hot rolled steel plate continuously shaped be open tube;
(g) with the relative both sides of electric-resistivity method heating open tube, both sides pressurization connection is produced upset at this place simultaneously;
(h) part that the connecting portion thickness of slab is increased is carried out grinding;
(i) make the connecting portion remelting form the fusing position with laser beam; And
(e) welding position is carried out 950 to 1100 ℃ of temperature ranges, 30 to 300 seconds solution treatment of temperature retention time.
Figure 1 shows that simulation makes the schematic diagram of the experimental rig of welded still pipe in one embodiment of the invention.
For making two phase stainless steel hot rolled steel plate as the mother metal of welded still pipe of the present invention, the chemical composition of this steel is: C: carbon forms carbide and produces poor Cr layer, can increase poor Cr layer amount and reduce corrosion resistance because of C content is higher than 0.03%, C content is decided to be 0.03% or still less, is preferably 0.02% or still less.Si: can reduce hot-workability because Si content is higher than 1%, Si content is decided to be 1% or still less, is preferably 0.5% or still less.Mn: for guaranteeing that under chloride environment the Mn addition must be 0.8% or more to the abundant solid solution of the favourable element N of opposing spot corrosion.On the other hand, the Mn addition too much surpasses the 2.0% spot corrosion drag that can be reduced under the hydrogen-sulfide environmental.Therefore, the Mn content range is 0.8 to 2.0%, is preferably 1.0 to 1.7%.P: because P content is higher than at 0.03% o'clock causes stress corrosion cracking under chloride environment or hydrogen-sulfide environmental, P content is decided to be 0.03% or still less, is preferably 0.02% or still less.S: can reduce hot-workability because S content is higher than 0.01%, S content is decided to be 0.01% or still less, is preferably 0.001% or still less.Cr: chromium is favourable to corrosion resistance.Being lower than 20% Cr content can not provide enough spot corrosion drags, reduces hot-workability and be higher than 30% Cr content.Therefore, Cr content is decided to be 20 to 30%, is preferably 22 to 25%.Mo: molybdenum helps resisting chloride corrosion.Being lower than 2.5% Mo content can not provide enough spot corrosion drags, reduces hot-workability and be higher than 4% Mo content.Therefore, Mo content optimum range is decided to be 2.5 to 4%, is preferably 2.9 to 3.3%.Ni: nickel is 4% or helps guaranteeing toughness more for a long time in addition, is higher than 7% Ni content reduction spot corrosion drag.So the optimum range of Ni content is decided to be 4 to 7%, be preferably 5.0 to 6.2%.N: nitrogen can effectively be regulated the mark of ferritic phase.The N addition is higher than 0.08% can strengthen the chloride corrosion drag.But N content is higher than at 0.2% o'clock, because Cr 2N separates out corrosion resistance is descended.Therefore, N content optimum range is decided to be 0.08 to 0.2%, is preferably 0.10 to 0.15%.
Other element except that above-mentioned has a negative impact only otherwise to purpose of the present invention and all can add or comprise.
After the hot rolled steel plate moulding that contains mentioned component is finished, begin to be used to make the tube forming step of welded pipe.
In the tube forming step, employing is similar to multistep format roll used in the general electricity seam steel pipe's production and is tubing with hot rolled steel plate is continuously shaped, in this step, after being formed as seam burn-on, hot rolled steel plate just becomes the shape of tubing, be open tube, its equipment comprises the series of formed roller identical with conventional seam welded tube production equipment.
Treat to adopt compression roller or similar devices to be docked to together and to produce upset, implement laser weld with laser beam generating device again for two of steel plate in conjunction with the limit.
Because Laser Welding adopts shroud of gas that welding position and air is isolated, the shield effectiveness of welding position is higher than the submerged-arc welding of adopting the powder solder flux to isolate the welding position, and therefore, Laser Welding has reduced the oxygen amount that enters the welding position.Because do not use solder flux, Laser Welding is not introduced slag inclusion.
Because Laser Welding adopts the high density energy bundle, the heat input of its requirement is more much lower than submerged-arc welding.Consequently the width of the performance heat affected area that may descend significantly narrows down.In addition, Laser Welding is carried out under very high speed of welding, so productivity ratio improves.
Laser Welding is the fusing process of intermediate that entire joint face is all melted, so this method seldom produces the defectives such as burning defective that often come across in the seam weldering.
When Laser Welding, the edge is applied upset, can avoid the melting zone to separate and undercut.
The homogeneity that grinding can guarantee thickness of slab is carried out at the thickness of slab increase position that upset causes, so that when next step solution treatment, evenly heat the welding position.
The welding of two phase stainless steel increases welding position ferritic phase mark, reduces corrosion resistance and low-temperature flexibility.For avoiding these to lack limit, the solution treatment that the welding position is carried out being incubated 30 to 300 seconds in 950 to 1000 ℃ of temperature ranges can realize even tissueization effectively.The heating-up temperature that is lower than 950 ℃ can cause the formation of σ phase and significantly reduce low-temperature flexibility, causes ferritic phase to meet or exceed 60% and be higher than 1100 ℃ heating-up temperature, thereby reduces corrosion resistance.The temperature retention time that is shorter than 30 seconds can not reach abundant solid solution, can cause grain coarsening and reduce low-temperature flexibility and be longer than 300 seconds temperature retention times.Preferably heating-up temperature is 1020 to 1070 ℃, and temperature retention time is 30 to 200 seconds.
As mentioned above, method of the present invention can be made the welding tubing that there are excellent in toughness and corrosion resistance in the welding position with two phase stainless steel under high production rate.
In above-mentioned method of laser welding, after the tube forming step, preferably heat the relative both sides of open tube with preheating position to be welded with electric-resistivity method.Preheating can be shortened the fusing time of Laser Welding step subsequently and boost productivity.
The present invention also provides a kind of method, after finishing the tube forming step, the both sides that the forming open pipe is relative weld together with resistance heated and produce upset, the part that increases of grinding joint area thickness of slab then, be that the upset part is so that make laser beam concentrate on joint area in next step reflow process, make joint area from the interior generation remelting outside managing of pipe with laser beam heats subsequently, for example with the laser output heating next two phase stainless steel welded pipe that under high production rate production have excellent in toughness and corrosion resistance of carbon dioxide laser beam with 10kW.
Because the tube forming step that comprises in the described process the last period is identical with the process of production electricity seam steel pipe with welding step, further raising speed is possible.Still contain oxide inclusions and other defective that can cause burning in this joint.If but thereby laser beam be oriented to joint area the broken and broken field trash disperse of oxide inclusions is distributed or during fusing owing to convection action is rejected to the edge, prepared welded still pipe can have good toughness and corrosion resistance.Above-mentioned manufacture method can be used for only needing to increase a cover laser generator on the ready-made electricity seam steel pipe's production equipment, and this method also can be used for newly-built production equipment certainly.Embodiment 1
Main purpose of the present invention is to improve the mechanical characteristic and the corrosion resistance of welding position.In this respect, the inventor has carried out the welding position of laboratory simulation test with simulation actual welding steel pipe.
Table 1 is depicted as the chemical analysis results of experiment with steel.The steel ingot of 50kg is made in every kind of steel capital vacuum fusion in the laboratory.It is thick in the preparation sample that steel ingot is hot-rolled down to 12mm.
Figure 1 shows that the experimental rig of simulation welded pipe manufacture process.Label 1 is depicted as steel plate, and 2 are resistance heated electrode (contact), and 3 is compression roller, and 4 is laser beam, and 5 is format roll.
Format roll 5 is admitted two samples on the relative both sides of simulation steel plate 1, and sample carries out the electrical resistance heating heating by the high frequency electric by contact 2 inputs, is exerted pressure the bilateral junction surface of carbon dioxide laser beam 4 directives then by compression roller 3.For industrial compression roller, upset is formed at the open tube exterior face, and the upset that the compression roller of analogue means produces is horizontal at sample.
The sample of composition shown in the table 1 is made welded specimen with device welding shown in Figure 1.Welding condition is: speed of welding 10m/min, laser output 10kW, the beam spot diameter, 0.5mm of focus place.Laser beam is vertical according to focusing on the toe junction surface to steel plate.
To each welded specimen of making, carry out 1050 ℃ of 180 seconds solution treatment of insulation down, water-cooleds then.Sample carries out joint straight draw test, Charpy-type test and pitting test.Have or not weld defect to determine by observing the Charpy-type test sample section.
The corrosion test of welding position is by immersing 10%FeCl with sample under condition of different temperatures 36H 272 hours pitting test is carried out in the O solution, estimates by the critical-temperature CPT that produces spot corrosion, and the toughness of welding position can vE by the absorption under-40 ℃ -40Estimate.
Result of the test is summarized in table 2.
No. 1 to No. 8 vE of steel sample of the present invention -40All surpass 100J, scope is from 119 to 225J, and CPT is equal to or higher than 35 ℃, and from 35 to 50 ℃ of scopes show toughness and corrosion resistance preferably.The joint tensile strength scope from 753 to 785N/mm 2(MPa), show that its intensity is in sufficiently high scope.Do not find weld defect in these steel samples.
On the contrary, No. 9, compared steel sample and No. 10 poor toughness, vE -40Be respectively 75J and 63J, corrosion-resistant, CPT is 20 ℃.In No. 10 compared steel samples, on the Charpy-type test sample section weld defect is arranged, its joint tensile strength is low, is 507N/mm 2(MPa).Embodiment 2
Adopt No. 5 and No. 7 steel hot rolling samples among the embodiment 1, make laser weld sample and seam welding sample with experimental rig shown in Figure 1.
Seam weldering sample making do not use laser beam heats but the high frequency electric that adopts the contact input with heated sample, exert pressure with compression roller then, carry out the solution treatment identical subsequently with embodiment 1.
All samples welding position toughness is all with method evaluation same as described above.
Result of the test is summarized in table 3.
The vE of seam weldering sample -40Value is more much lower than Laser Welding sample.Therefore, Laser Welding is more favourable for obtaining good welding position toughness.Embodiment 3
No. 5 and No. 7 steel hot rolling samples among the embodiment 1 are carried out producing after the laser weld 1050 ℃ of 180 seconds or solution treatment in 30 seconds with experimental rig shown in Figure 1 and without the sample of solution treatment.
All these samples are carried out aforementioned Charpy-type test and pitting test, and result of the test is summarized in table 4.
The vE of solution treatment sample not -40With the CPT value far below sample through solution treatment, solution treatment of the present invention is necessary for obtaining the corrosion resistance that the good toughness in welding position becomes reconciled.
Table 1
Grade of steel Chemical composition (wt%) C Si Mn P S Cr Mo Ni N Remarks
????1 ????2 ????3 ????4 ????5 ????6 ????7 ????8 ????9 ????10 ?0.010?0.49?1.01?0.016?0.0010?23.02?2.97?4.96?0.124 ?0.012?0.48?0.94?0.019?0.0006?22.12?2.93?5.90?0.130 ?0.019?0.41?1.48?0.018?0.0008?21.30?2.92?5.80?0.150 ?0.024?0.45?1.11?0.017?0.0010?22.80?2.90?4.90?0.100 ?0.018?0.48?1.01?0.015?0.0009?24.30?3.00?6.20?0.110 ?0.008?0.00?0.82?0.010?0.0006?23.60?3.10?6.90?0.140 ?0.018?0.49?1.77?0.019?0.0010?22.40?3.05?5.85?0.143 ?0.025?0.48?1.68?0.016?0.0007?22.56?3.28?6.18?0.088 ?0.020?0.70?0.70?0.020?0.0110?22.58?5.00?9.50?0.210 ?0.038?0.60?0.61?0.015?0.0010?24.50?2.93?9.94?0.160 Contrast of the present invention
Table 2
Grade of steel Joint tensile strength (N/mm 2) ???vE -40????(J) ???CPT ??(℃) There is/do not have the welding defective Remarks
????1 ????2 ????3 ????4 ????5 ????6 ????7 ????8 ????9 ????10 ????785 ????774 ????781 ????753 ????762 ????768 ????783 ????756 ????752 ????507 ????203 ????173 ????131 ????120 ????231 ????225 ????121 ????119 ????75 ????63 ????50 ????35 ????30 ????35 ????55 ????50 ????40 ????40 ????35 ????20 Not having has Contrast of the present invention
Table 3
Grade of steel Welding method ????vE -40????(J) Remarks
???5 ???5 ???7 ???7 ????LW ????ERW ????LW ????ERW ????231 ????25 ????121 ????10 The present invention contrasts the present invention's contrast
LW: Laser Welding ERW: electric resistance welding
Table 4
Grade of steel Solution treatment ????vE -40????(J) ???CPT ??(℃) Remarks
??5 ??5 ??7 ??7 ??7 1050 ℃ * 180sec, the 1050 ℃ * 30sec of 1050 ℃ * 180sec that is untreated is untreated ????231 ????65 ????131 ????120 ????30 ????55 ????20 ????40 ????35 ????20 The present invention contrasts contrast of the present invention

Claims (6)

1. the method with two phase stainless steel manufacturing welded still pipe comprises the steps:
With the multistep format roll that the hot rolling two phase stainless steel is continuously shaped for relative edge's open tube is arranged, this two-phase stainless steel plate comprises: by weight, and 0.03% or C still less, 1% or Si still less, 0.8 Mn to 2.0%, 0.03% or P still less, 0.01% or S still less, 20 to 30% Cr, 2.5 Mo to 4%, 4 to 7% Ni, and 0.08 to 0.2% N, all the other are Fe substantially;
Weld above-mentioned open tube relative edge and form welded pipe, upset adopts laser beam that the relative edge is heated to welding temperature simultaneously;
The part that the grinding welding position increases owing to upset generation thickness of slab, and
30 to 300 seconds solution treatment of 950 to 1100 ℃ of temperature retention times of temperature range is carried out in the welding position.
2. the method for claim 1, described laser beam is the carbon dioxide laser beam.
3. the method for claim 1 is after described open tube moulding, before the welding, with resistance heated preheating open tube relative edge.
4. the method for claim 2 is after its open tube moulding, before the welding, with resistance heated preheating open tube relative edge.
5. the method with two phase stainless steel manufacturing welded still pipe comprises the steps:
With the multistep format roll that the hot rolling two phase stainless steel is continuously shaped for relative edge's open tube is arranged, this two phase stainless steel comprises: by weight, and 0.03% or C still less, 1% or Si still less, 0.8 Mn to 2.0%, 0.03% or P still less, 0.01% or S still less, 20 to 30% Cr, 2.5 Mo to 4%, 4 to 7% Ni, and 0.08 to 0.2% N, all the other are Fe substantially;
The method of being heated by resistive heats the relative both sides of above-mentioned open tube and makes this relative edge produce pressurization to be connected to form welded pipe by applying upset;
The grinding welding position is because the part that upset generation thickness of slab increases;
Make the welding position remelting produce the fusion zone with laser beam, and
950 to 1100 ℃ of temperature ranges, 30 to 300 seconds solution treatment of temperature retention time are carried out in the welding position.
6. the method for claim 5, described laser beam is the carbon dioxide laser beam.
CN96119786A 1995-12-18 1996-12-13 Fabrication method of welded steel pipe using dual-phase stainles steel Pending CN1157768A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP7329129A JPH09170050A (en) 1995-12-18 1995-12-18 Production of welded dual-phase stainless steel pipe
JP329129/95 1995-12-18

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CN1157768A true CN1157768A (en) 1997-08-27

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CN1295040C (en) * 2002-07-23 2007-01-17 江南机器厂 Local solution treating method for thin-wall tubular piece of aluminium alloy
CN100354562C (en) * 2006-01-20 2007-12-12 天津商学院 High alloy steel seamless steel pipe and production method thereof
CN102592771A (en) * 2012-03-01 2012-07-18 常州市科晶电子有限公司 Novel antitheft tag magnetic material, production process thereof and acoustic magnetic antitheft tag
CN102642113A (en) * 2012-04-05 2012-08-22 南通贝斯特船舶与海洋工程设计有限公司 Welding method of structural member of ship fuel tank
CN103966522A (en) * 2013-01-25 2014-08-06 精工电子有限公司 Two-phase Stainless Steel, Method Of Manufacturing The Same, And Diaphragm, Pressure Sensor, And Diaphragm Valve Using Two-phase Stainless Steel
CN104096972A (en) * 2014-06-25 2014-10-15 武汉钢铁(集团)公司 Method for lowering welding joint tapebreak rate of chill state phosphate-containing IF (interstitial free) steel
CN105458507A (en) * 2015-12-23 2016-04-06 中国石油天然气股份有限公司 Strengthening method of pipeline loop welding head
CN108747018A (en) * 2018-05-30 2018-11-06 山西太钢不锈钢股份有限公司 A kind of negative gap joint welding method of austenitic stainless steel
CN109759732A (en) * 2019-02-28 2019-05-17 上海宇洋特种金属材料有限公司 A kind of S32205 two phase stainless steel welding process
WO2020034050A1 (en) * 2018-08-14 2020-02-20 杰森能源技术有限公司 High-frequency induction welded high alloy anti-corrosion coiled tubing and preparation method therefor
CN114107827A (en) * 2021-12-08 2022-03-01 福州大学 Duplex stainless steel powder for 3D printing and preparation and printing methods thereof

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JP5992189B2 (en) * 2012-03-26 2016-09-14 新日鐵住金ステンレス株式会社 Stainless steel excellent in high temperature lactic acid corrosion resistance and method of use
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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1295040C (en) * 2002-07-23 2007-01-17 江南机器厂 Local solution treating method for thin-wall tubular piece of aluminium alloy
CN100354562C (en) * 2006-01-20 2007-12-12 天津商学院 High alloy steel seamless steel pipe and production method thereof
CN102592771A (en) * 2012-03-01 2012-07-18 常州市科晶电子有限公司 Novel antitheft tag magnetic material, production process thereof and acoustic magnetic antitheft tag
CN102592771B (en) * 2012-03-01 2014-07-30 常州市美思科特电子有限公司 Novel antitheft tag magnetic material, production process thereof and acoustic magnetic antitheft tag
CN102642113A (en) * 2012-04-05 2012-08-22 南通贝斯特船舶与海洋工程设计有限公司 Welding method of structural member of ship fuel tank
CN103966522A (en) * 2013-01-25 2014-08-06 精工电子有限公司 Two-phase Stainless Steel, Method Of Manufacturing The Same, And Diaphragm, Pressure Sensor, And Diaphragm Valve Using Two-phase Stainless Steel
CN104096972A (en) * 2014-06-25 2014-10-15 武汉钢铁(集团)公司 Method for lowering welding joint tapebreak rate of chill state phosphate-containing IF (interstitial free) steel
CN105458507A (en) * 2015-12-23 2016-04-06 中国石油天然气股份有限公司 Strengthening method of pipeline loop welding head
CN108747018A (en) * 2018-05-30 2018-11-06 山西太钢不锈钢股份有限公司 A kind of negative gap joint welding method of austenitic stainless steel
WO2020034050A1 (en) * 2018-08-14 2020-02-20 杰森能源技术有限公司 High-frequency induction welded high alloy anti-corrosion coiled tubing and preparation method therefor
CN109759732A (en) * 2019-02-28 2019-05-17 上海宇洋特种金属材料有限公司 A kind of S32205 two phase stainless steel welding process
CN114107827A (en) * 2021-12-08 2022-03-01 福州大学 Duplex stainless steel powder for 3D printing and preparation and printing methods thereof

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