CN104089109A - 625MPa-level UOE and manufacturing method thereof - Google Patents
625MPa-level UOE and manufacturing method thereof Download PDFInfo
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- CN104089109A CN104089109A CN201410306696.0A CN201410306696A CN104089109A CN 104089109 A CN104089109 A CN 104089109A CN 201410306696 A CN201410306696 A CN 201410306696A CN 104089109 A CN104089109 A CN 104089109A
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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
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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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
- C22C38/001—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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/17—Rigid pipes obtained by bending a sheet longitudinally and connecting the edges
Abstract
Provided are a 625MPa-level UOE and a manufacturing method of the 625MPa-level UOE. The 625MPa-level UOE comprises, by weight, 0.015-0.080% of C, 0.1-0.5% of Si, 1.40-2.20% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.003% of S, 0.03-0.10% of Nb, 0.01-0.035% of Ti, 0.20-0.50% of mixture of Cu and Ni, 0.3-o.6% of mixture of Cr and Mo, 0.001-0.005% of Ca, 0.02-0.045% of Al, smaller than or equal to 0.010% of N, smaller than or equal to 0.008% of O and balance Fe and unavoidable inclusions, wherein the ratio of Cu to Ni in the mixture is 1-2. The yield strength of the 625MPa-level UOE is higher than 625MPa, the tensile strength of the 625MPa-level UOE is higher than 700MPa, impact energy at low temperature of -20 DEG C is higher than 230J, the percentage of the shearing fracture area of DWTT at the temperature of -20 DEG C is higher than 85%, and the 625MPa-level UOE has manufacturability. The 625MPa-level UOE can be used in the fields of oil and gas transportation and high-strength structures.
Description
Technical field
The present invention relates to UOE welded tube and manufacture method thereof, particularly a kind of 625MPa level UOE welded tube and manufacture method thereof, this UOE welded tube can be used for the association area of oil and gas pipes conveying, extra large work and the application of other structural members.
Background technique
Under the overall background of " low-carbon economy " development, during " 12 ", China is each mainly all has higher requirement the use steel industry such as use dynamics, the especially energy, building, automobile, household electrical appliances, shipping container, engineering machinery that strengthens green, low-carbon (LC), energy-conserving and environment-protective structural section by steel industry for steel performances such as high strength, corrosion-resistant, long lifetives.This trend of Application and Development positive adaptation of the UOE welded tube of 625MPa and above grade of steel, this product can be applied to the fields such as energy conduit, ocean engineering and building structure.
It is one of most economical efficient mode of movement of oil and gas transmission that pipeline is carried, the developing history of the existing many decades of China's oil and gas pipes construction, pipeline material also develops into the API X series grade of steels such as X42～X80 from initial A, B level steel, the X80 of 550MPa level is also the highest grade of steel of current large-scale application.The upgrading of pipeline industry during " 12 " proposed new demand to steel product quality, the oil and gas pipes main line construction of the five-year China will be invested 3,500 hundred million yuan, build the natural-gas transfer pipelines such as transfering natural gas from the west to the east three lines (Huo'erguosi-Shaoguan), transfering natural gas from the west to the east four lines (Turfan-centre halfback), middle remote oil-gas pipeline (Kyaukpyu city-Kunming, the western harbour of Burma), centre halfback-Chongqing-Kweiyang gas transmission line, capital, Shan four lines.In order to save building time, to reduce pipeline occupation of land and investment, the large throughput pipeline in 480 billion cubic meter/years becomes the emphasis of following pipe-line construction, therefore 625MPa and more exploitation and the application of high strength welded tube are not only conducive to build steel using amount, reduce pipeline construction and operation cost, also can improve transfer efficiency, be one of ideal chose of following pipe-line construction simultaneously.
High strength UOE welded tube has the advantages such as lightweight, intensity is high, the life-span is long, is also the update product that is widely used in the can of ocean engineering, building, stake, pillar and other structural members.By improving intensity, this welded tube can significantly alleviate structure weight, can realize the structure building of large height, longspan, reduces metal consumption, raises labour productivity; Further improve toughness, can Secure Application in the environmental area such as polar region, low temperature.The developed countries such as high strength welded tube Europe, America, Japan and Southeast Asia have conducted in-depth research, and China is in the starting stage.
The feature of Composition Design, microstructure design and the tubulation mode of existing high strength UOE welded tube is as follows:
On Composition Design, if Chinese patent CN100398684 is by adopting B microalloying can significantly improve the intensity of steel, but the toughness of steel is relatively on the low side; Japan Patent JP61099660A adopts high Cr, Ni alloy designs to improve the corrosion resistance of welded tube, and cost of alloy is higher; Chinese patent CN200780024813.2 does not limit the elemental gas such as N, O, but high N, O content damage low-temperature flexibility and the aging performance of steel.
In microstructure design, prior art often adopts multiphase structure design, as Chinese patent CN200480037950.6 adopts bainite microstructure the design more than polygonal ferrite and 80% below 20%, owing to having the existence of interphase boundary to be unfavorable for to improve the impact toughness of steel, the fluctuation of phase ratio simultaneously easily causes performance inconsistency.
In tubulation mode, prior art often adopts the modes such as volute, JCOE pipe and weldless tube, carries out tubulation as Chinese patent CN200710117991.1 adopts double slit weldering, and dimensional accuracy is poor, and the longer safety in utilization of weld seam is poor; Chinese patent CN100398684, ZL200710185350.X, CN200710185346.3 all adopt JCOE tubulation mode, and which residual stress is higher, cast size is poor, is unfavorable for site operation and welding; Also all adopt spiral welding tubulation mode just like Chinese patent ZL201010112123.6, CN201010216400.8, same this tubulation mode is without full pipe hole enlargement operation, residual stress distribution is inhomogeneous, cast is second-rate, and weld seam is longer simultaneously, and safety reliability is lower.
Summary of the invention
The object of the present invention is to provide a kind of 625MPa level UOE welded tube and manufacture method thereof, this welded tube yield strength is greater than 85% higher than 700MPa ,-20 DEG C of low-temperature impact works higher than 230J ,-20 DEG C of DWTT shear fracture area percent higher than 625MPa, tensile strength, has manufacturability simultaneously.This welded tube can be used for oil gas and carries and high strength structure.
For achieving the above object, technological scheme of the present invention is:
625MPa level UOE welded tube external diameter scope of the present invention is
wall thickness range is 10.0～20.0mm.Steel plate adopts the Composition Design of C-Mn-Nb composition system, low C alloyage, and adopt wide and heavy plate mill to carry out sheet stock production, coordinate suitable controlled rolling and DQ+ACC Controlled cooling process, produce taking lower bainite as main high intensity and high ductility sheet stock; Obtain the UOE ERW with high strength, high tenacity through operations such as C, U, O forming and prewelding, interior weldering, outside weld, hole enlargements.
Concrete, a kind of 625MPa level UOE welded tube of the present invention, its chemical component weight percentage is C:0.015～0.080%, Si:0.1～0.5%, Mn:1.40～2.20%, P≤0.015%, S≤0.003%, Nb:0.03～0.10%, Ti:0.01～0.035%, Cu+Ni:0.20～0.50%, and Cu/Ni:1～2, Cr+Mo:0.3～0.6%, Ca:0.001～0.005%, Al:0.02～0.045%, N≤0.010%, O≤0.008%, all the other are Fe and are inevitably mingled with.
In the Composition Design of steel of the present invention:
Carbon C: the most basic intensified element.Carbon dissolution forms interstitial solid solution in steel, plays solution strengthening, forms Carbide Precipitation with carbide, plays the effect of precipitation strength.But ductility, toughness and the welding performance of too high C to steel is unfavorable; The intensity of the too low reduction steel of C.So C is built in 0.015～0.080%.
Silicon Si: solution strengthening element be also the deoxidant element in steel, but too high levels can worsen the welding performance of steel is simultaneously unfavorable for that in the operation of rolling, hot rolling iron scale is removed simultaneously, and therefore content is controlled at 0.1～0.5%.
Manganese Mn: improving the intensity of steel by solution strengthening, is to compensate main, the economic intensified element that causes loss of strength because of the reduction of C content in steel.Mn still expands the element of γ phase region, can reduce γ → α phase transition temperature of steel, contributes to obtain tiny phase-change product, can improve the toughness of steel; But Mn is easy segregation element, in the time that Mn content is higher, in casting cycle, Mn is easily at thickness of slab center segregation, and the martensitic structure of the hard phase of generation after rolling completes, reduces the low-temperature flexibility of material and resist dynamic tear resistance.Therefore be with Mn content in the present invention to be defined as 1.40～2.20%.
Niobium Nb:Nb is one of important element of low-carbon micro steel-alloy, the Nb strain inducing of solid solution in course of hot rolling is separated out and is formed Nb (N, C) particle, pinning crystal boundary suppresses that deformation is austenitic grows up, through controlled rolling with to control the cooling deformation austenite phase transformation that makes be the tiny product with high dislocation density.In addition, the Nb of solid solution, after batching, with second phase particles NbC disperse educt in matrix, plays precipitation strength effect.Too low Nb content disperse educt DeGrain, does not have crystal grain thinning, the effect of strengthening matrix; Too high Nb content, easily produces slab crackle, affects surface quality, simultaneously can severe exacerbation welding performance.In the present invention, Nb content should be limited to 0.03～0.10%.
Titanium Ti: be a kind of strong carbonitride forming element, the not molten carbonitride of Ti can stop growing up of austenite crystal in the time that steel heats, and the TiN separating out in the time of the roughing of high temperature austenite district can effectively suppress Austenite Grain Growth.In welding process, the TiN particle in steel can significantly stop heat affected zone grain growth in addition, thereby the welding performance of improving steel plate has obvious effect to the impact toughness of improving welding heat affected zone simultaneously.In the present invention, Ti content is controlled at 0.01～0.035%.
Copper, nickel (Cu, Ni): can improve by solution strengthening effect the intensity of steel, Cu also can improve the corrosion resistance of steel simultaneously, and Ni is conducive to improve toughness; Add by a certain percentage Ni can improve the red shortness that Cu easily causes in steel, reduce slab crackle and stick up skin producing.Too high Cu, Ni increases cost and is unfavorable for welding, therefore in the present invention, limits Cu+Ni:0.20～0.50%, requires Cu/Ni:1～2 simultaneously.
Chromium, Mo (Cr, Mo): improve the hardening capacity, the important element of hardenability of steel, effectively improve the intensity of steel, both can compound interpolations or add separately, mainly play phase transformation control and improve the structure property uniformity on thickness direction.But too high chromium and manganese add in steel simultaneously, can cause low melting point Cr-Mn composite oxides to form, in hot procedure, form surface crack, simultaneously can severe exacerbation welding performance; Too high Mo adds the content that increases MA constituent element, and On Impact Toughness is unfavorable.The present invention specifies Cr+Mo:0.30～0.60%.
Nitrogen N: in micro alloyed steel, suitable nitrogen content can, by forming dystectic TiN particle, play the effect that suppresses again slab grain enlargement in heating process, improves the obdurability of steel.But in the time of N too high levels, after timeliness, the free N atom pinning dislocation of high concentration, obviously improves yield strength, damages toughness simultaneously.Therefore in the present invention, control N≤0.010%.
Oxygen O: smelt for low-alloy Clean Steel, all need to carry out deoxidation treatment at smelting endpoint, to reduce the bubble and the oxide inclusion that produce in casting cycle, improve the endoplasm of steel, the low-temperature impact toughness that improves finished steel plate and anti-dynamic tear resistance.When oxygen content is during higher than 80ppm, the endoplasm defects such as slag inclusion, pore significantly increase, so control O≤0.008% in the present invention.
Sulphur, phosphorus (S, P): be inevitable impurity element in steel, it is more low better to wish.Process sulphide is carried out to inclusion morphology control by super-low sulfur (being less than 30ppm) and Ca, control P content simultaneously below 150ppm, can ensure that invention steel has good low-temperature impact toughness.
Calcium (Ca): process the form that can control sulphide by Ca, improve the anisotropy of steel plate, improve low-temperature flexibility, for guaranteeing that the control range of optimum efficiency Ca is 0.0010～0.0050%.
Aluminium (Al): be the element adding for deoxidation in steel, add appropriate Al and be conducive to crystal grain thinning, improve the toughness and tenacity of steel, in the present invention, the content control range of Al is 0.02～0.045%.
Therefore,, taking materials theory such as grain refinement, precipitation strength, phase transformation controls as basis, adopted the Composition Design of lower C content, high Mn, Cu/Ni/Cr/Mo alloyage and Nb, Ti microalloying; And in conjunction with controlled rolling and the cooling thermo-mechanical treatment process of control, obtain, taking lower bainite as the main hot rolling steel plate for the manufacture of 625MPa level welded tube, thering is the Mechanical Characteristics of high strength, high tenacity.
The manufacture method of 625MPa level UOE welded tube of the present invention, is characterized in that, comprises the steps:
1) smelt continuous casting
Press mentioned component and smelt, through smelting-LF+RH external refining-continuous casting, obtain the continuous casting steel billet of 200～300mm thickness specification;
2) heating: slab 1070～1200 DEG C of heating-up temperatures again;
3) roughing: roughing stops temperature and is >=960 DEG C; Intermediate blank is thick: the thick 4t～8t of intermediate blank, and t is final finished steel plate thickness, mm;
4) finish rolling: finishing temperature is 730～820 DEG C;
5) DQ direct quenching is cooling: final cooling temperature is 350～450 DEG C, cooling rate >=30 DEG C/s;
6) ACC is cooling fast: final cooling temperature is 80～350 DEG C, cooling rate >=15 DEG C/s;
7) steel pipe forming welding, comprises steel pipe forming-UO moulding, steel-pipe welding; O forming compressibility is 0.18～0.22%, wherein, and width × 100% behind O forming compressibility=(width behind π × (pre-postwelding external diameter-wall thickness)-milling limit)/milling limit;
8) hole enlargement E moulding: the steel pipe total length after welding is carried out to hole enlargement, to meet the final cast requirement of steel pipe, enlarging rate scope is 0.8%～1.2%, wherein, and outer diameter of steel pipes × 100% before enlarging rate=(the front outer diameter of steel pipes of outer diameter of steel pipes-enlarging after hole enlargement)/hole enlargement.
Further, step 7) the front preparation of steel pipe forming welding weldering, comprising:
1) starting weld tab welding: in four corner welding striking steel plates of steel plate, striking effect while being mainly used in welding;
2) milling limit, groove size: by divided edge of steel plate size design.
Further, step 7) welded tube forming in steel pipe forming welding, comprise,
1) C moulding: claim again crimp moulding, on crimp forming machine, the limit portion of steel plate is bent to required shape by beader, guarantee the straight section minimum of edges of boards in O forming process;
2) forming U shaped articles: on forming U shaped articles machine, by the steel plate of pre-flanging through being once pressed into " U " type;
3) O forming: on O forming machine, by the steel plate after forming U shaped articles through being once pressed into " O " type;
4) high pressure water washing and oven dry: by being that the inner and outer surface that welds the steel pipe that cracks carries out high pressure water washing after moulding, remove the pollutions such as iron scale, grease, dust; After flushing completes, enter immediately drying oven and carry out drying and processing, bake out temperature is 100 DEG C～300 DEG C.
Again, step 7) steel-pipe welding in steel pipe forming welding, comprising:
1) prewelding: to the steel pipe that cracks after O forming, make its opposite side accurately to its, location, and adopt CO
2or Ar+CO
2continuous prewelding welding is carried out in protection weldering, to ensure arc stability in follow-up interior weldering, outside weld process, guarantees final welding quality;
2) weldering in:
For 10.0～15.0mm wall thickness specifications welded tube, adopt three submerged welding processes to carry out weldering welding in steel pipe, the 1st is DC reverse connection, and the 2nd, 3 is interchange, and gage of wire is 3.5～4.5mm; The 1st electric current is 550～650A, and voltage is 22～30V; 2nd, 3 electric currents are 450～600A, and voltage is 30～40V;
For 15.1～20.0mm wall thickness specifications welded tube, adopt four submerged welding processes, the 1st electric current is DC reverse connection, and the 2nd, 3,4 is interchange, and gage of wire is 3.5～4.5mm; The 1st in order to exchange reversal connection, electric current is 1100～1200A, and voltage is 28～40V; 2nd～4 electric currents are that 500～700A, voltage are 34～42V;
Welding speed is 1.5～1.9m/min; Interior weldering solder flux all need be dried within the scope of 250～450 DEG C, drying time >=2 hour;
3) outside weld:
For 10.0～15.0mm wall thickness specifications welded tube, adopt three submerged welding processes to carry out weldering welding in steel pipe, the 1st is DC reverse connection, and the 2nd, 3 is interchange, and gage of wire is 3.5～4.5mm; The 1st electric current is 850～1000A, and voltage is 30～40V; 2nd, 3 electric currents are 450～650A, and voltage is 35～45V;
For 15.1～20.0mm wall thickness specifications welded tube, adopt four submerged welding processes, the 1st electric current is DC reverse connection, and the 2nd, 3,4 is interchange, and gage of wire is 3.5～4.5mm; The 1st electric current is 1100～1200A, and voltage is 28～40V; 2nd～4 electric currents are that 500～700A, voltage are 34～42V;
Welding speed is 1.3～1.8m/min; Outer-welding welding flux all need be dried within the scope of 250～450 DEG C, drying time >=2 hour.
In addition, seam inspection after welding, comprises,
Welding line ultrasonic flaw detection: adopt ultrasonic detection method, detect postwelding crackle, layering, the weld defect such as lack of penetration;
Weld seam x-ray inspection: adopt x-ray inspection method, the point-like weld defect such as detect postwelding bubble, be mingled with.
In addition, step 8) comprise the steps: after hole enlargement
9) welding line ultrasonic flaw detection: adopt ultrasonic detection method, detect crackle after hole enlargement, layering, the weld defect such as lack of penetration;
10) weld seam X-ray examination: adopt x-ray inspection method, the point-like weld defect such as detect bubble after hole enlargement, be mingled with;
11) chamfered edge: tack, chamfered edge processing are carried out in steel pipe two ends, for job site butt welding offers convenience;
12) pipe end layering ultrasonic flaw detection: the steel tube end part after chamfered edge is carried out to ultrasonic flaw detection test, prevent lamination defect;
13) pipe end magnetic particle flaw detection: the steel tube end part after chamfered edge is carried out to magnetic powder detection, prevent lamination defect;
14) upper guard ring: pipe end is protected, guaranteed the butt welding quality in steel pipe site operation process.
In above-mentioned mask-making technology design, product of the present invention adopts the technique of cold+weak cold (DQ+ACC) by force to control, DQ is strong, and the cold temperature that stops is 350～450 DEG C, mainly to suppress to occur middle temperature transformation by high cooling rate, avoid large heat exchange factor fluctuating temperature interval, be conducive to improve template, and acquisition has the more low temperature phase change product of high-strength tenacity coupling; ACC is weak, and cold to stop cold temperature be 80～350 DEG C, is mainly to obtain the stable cold temperature of stopping by low cooling rate, promotes that low temperature phase change carries out, and to obtain single lower bainite tissue, mates thereby obtain preferably intensity and toughness.In above-mentioned moulding process design, interact by the pressure stress in O (compressive strain), E (tensile buckling) forming process and tensile stress, improve the circularity of welded tube, and reduce residual stress.
The present invention's difference compared with existing patent is:
The disclosed employing double slit of Chinese patent CN200710117991.1 submerged arc is manufactured the method for ERW, it adopts width is two block plates of steel pipe girth 1/2, utilize double-submerged arc method first to carry out the longitudinally limit splicing of two block plates, then take conventional longitudinal submerged arc welded pipe production technology to carry out steel pipe manufacturing.Or two block plates are carried out respectively to C moulding, make C shape semicanal.Two C shape semicanal groups are welded into O shape pipe to location, then carry out the welding of twice weld seam.Through hole enlargement, non-destructive inspection, the double-seam submerged-arc welding pipe that completes oil, natural gas transport is made, thereby plays the manufacture difficulty that reduces tubulation sheet material, produces the superior in quality steel pipe of heavy caliber and wall thickness.The present invention adopts C, U, O, E moulding process and single seam vertical masonry joint submerged arc welding method to weld on pipe-making method, has significant difference with this patent on tube-making process.
Chinese patent CN100398684 provides the made straight-line joint submerged arc welding tube of a kind of X120 pipe line steel and manufacturing process thereof, it adopts containing B microalloying Composition Design and controlled rolling process and manufactures high-intensity X120 steel plate, through milling limit, the operation system such as pre-bending, JCO moulding, prewelding, interior weldering, outside weld, hole enlargement, chamfered edge is straight-line joint submerged arc welding tube.The present invention adopts and has manufactured the steel plate with some strength and toughness containing composition design method and the TMCP technique of B, and adopts UOE technique to carry out welded tube manufacture, and the welded tube yield strength of manufacture reaches 625MPa and higher intensity and excellent impact toughness; There is more excellent ovality and residual stress distribution with respect to JCOE moulding process simultaneously.
Japan Patent JP61099660A has introduced a kind of high corrosion resistance welded tube and manufacture method thereof.By adopting low C, high Cr (18～25%), high Ni (27～40%) Composition Design can obtain high corrosion resistance welded tube steel plate, and can be used for welded tube manufacture.The present invention adopts the composition design method of low C microalloy and cooling controlling and rolling controlling process to manufacture high strength and ductility steel plate, and Cr, Ni content, far below the lower limit of this patent, adopt UOE technique to carry out welded tube manufacture simultaneously.。
Chinese patent ZL200710185350.X discloses a kind of manufacture method of X100 straight-line joint submerged arc welding tube, adopts low-carbon microalloyed sheet stock, has the mechanical characteristics of high-intensity high-tenacity through the ERW of JCO molding procedure manufacture.The present invention adopts UOE tube-making process, can obtain more excellent cast quality and residual stress distribution, is conducive to follow-up construction and welding.Exist and on molding mode, have larger difference with this patent.
Chinese patent ZL201010112123.6 discloses a kind of manufacture method of X100 spiral submerged welded pipe, it adopts low-carbon microalloyed sheet stock, through continuous helical moulding and spiral submerged arc welded technique, the welded tube of manufacturing has the mechanical characteristics of high-intensity high-tenacity, this patent mainly stresses tube-making process technology, and the Composition Design of sheet stock mainly adopts the composition design method of higher Mn.The present invention adopts UOE tube-making process, can obtain more excellent cast quality and residual stress distribution, is conducive to follow-up construction and welding.On raw material pattern, moulding and welding manner, all there is larger difference with this patent.
Chinese patent CN200780024813.2 has proposed line-pipes High Tensile Steel Tube and the manufacture method thereof of the excellent in low temperature toughness of the toughness drop of a kind of HAZ that the invention provides a kind of steel pipe, and line-pipes high-strength steel sheet and manufacture method thereof as the blank of line-pipes High Tensile Steel Tube are also provided.On Composition Design, do not add the elements such as Cu, Ni, Cr, and N, O content are not limited.The present invention has adopted Cu, Ni, Cr alloyage on Composition Design, the upper limit of N, O is limited simultaneously; And adopt UOE tube-making process to carry out welded tube manufacture, and can obtain more excellent cast quality and residual stress distribution, be conducive to follow-up construction and welding.In Composition Design and tubulation mode, there is larger difference with this patent.
Chinese patent CN200480037950.6 provides a kind of high-strength thick line pipe welded steel pipe and manufacture method thereof of excellent in low temperature toughness, after being configured as to tubulose, welds mother metal steel plate, the metal structure of mother metal steel plate comprises the bainite more than polygonal ferrite and 80% below 20%, effectively crystal particle diameter is below 20 μ m, and can make effective crystal particle diameter of welding heat affected zone is below 150 μ m simultaneously.The former material microstructure of the present invention is mainly full bainite microstructure; And adopt UOE tube-making process to carry out welded tube manufacture, can obtain more excellent cast quality and residual stress distribution.In microstructure design and tubulation mode, there is larger difference with this patent.
Chinese patent CN200710185346.3 discloses a kind of manufacture method of X80 pipeline JCOE direct sew submerged arc welding tube, and it is applied to the delivery line of manufacturing high-intensity high-tenacity petroleum gas.The method comprises the HTP X80 controlled rolling steel plate that use chemical composition is C0.03～0.05%, Si0.20～0.30%, Mn1.65～1.75%, P≤0.01%, S≤0.005%, Nb+Ti0.10～0.15%, Ni+Cr+Cu0.5～0.7%; " JCO " moulding process, air protection prewelding, interior weldering, outside weld, hole enlargement, ultrasonic examination, X-ray examination, the hydrostatic test, the pipe end that steel plate is depressed through milling limit, crimp, multi-pass manufactures the petroleum gas delivering pipe of high-intensity high-tenacity to operations such as rib, ultrasonic examination, X-ray examinations.The interior outside weld of steel pipe adopts four tandem Lincoln welds, and by selecting applicable welding wire, solder flux, controls welding parameter, thereby controls composition, the tissue of weld seam, makes the performance of weld seam arrive X80 performance requirement.The present invention adopts the Composition Design of higher Mn and Nb+V < 1.0%, adopts UOE tube-making process simultaneously, can obtain more excellent cast quality and residual stress distribution, is conducive to follow-up construction and welding.This exists on Composition Design, molding mode and has larger difference with contrast.
US Patent No. 6464802 has proposed a kind of manufacture method of high Cr line pipe, by adopting the Composition Design scheme of≤0.02% low C ,≤0.3%Nb and 10%～14% high Cr, to improve heat affected zone toughness and hot-working character, belong to stainless steel series tube product.The low C alloy steel pipe of high strength proposing with the present invention is diverse product type.
Japan Patent JP63250418A has proposed a kind of manufacture method of high-strength low-yield ratio seamless line pipe, its Composition Design is taking C-Mn as basic ingredient, add appropriate Nb microalloying, direct cool to room temperature after hot rolling, and the cooling rate in～600 DEG C of temperature ranges is 5～30 DEG C/s, can obtain the seamless line pipe of yield ratio≤0.85%.Steel plate of the present invention adopts microalloying composition design method and cooling controlling and rolling controlling process to manufacture, and adopts UOE technique to carry out straight-line joint submerged arc welding tube manufacture.Compared with this patent, in Composition Design and tubulation mode, there is larger difference.
The present invention has following features:
(1) the present invention adopts the design of low C microalloying Composition Design and lower bainite microstructure, and effective particle size is at 3 μ m and following, to obtain high strength, high low-temperature impact toughness and good anti-dynamic tear resistance;
(2) adopt compared with low alloying design, by rolling and the process for cooling of strengthening, in guaranteed performance, reduced cost of production;
(3) adopt low S, low P design, to ensure that developing steel has good degree of purity, improve low-temperature impact toughness;
(4) in process for cooling control, adopt cold+weak cold (DQ+ACC) technique by force, to obtain required phase-change organization's type, play the effect that improves template simultaneously;
(5) the present invention adopts C, U, O, E moulding process to carry out moulding, and adopts suitable technique to weld, and realizes excellent mechanical property and cast Accuracy Matching.
Compared with existing production steel pipe, UOE welded tube performance of the present invention reaches following requirement:
Tensile property: yield strength Rp0.2>=625MPa, tensile strength Rm>=700MPa; Specific elongation A
50.8>=15%;-20 DEG C of ballistic work: AKv>=230J;-20 DEG C of DWTT (Drop Weight Tear Test, drop weight tearing test) performance: SA%>=85%.
Brief description of the drawings
Fig. 1 is the typical microstructures of embodiment of the present invention steel.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention will be further described.
According to steel Chemical composition of the present invention requirement, design embodiment's chemical composition, as shown in table 1.Table 2 is embodiment of the present invention rolling and tube-making process path.By above-mentioned composition and technological design, the mechanical property that each embodiment obtains is as shown in table 3.
Visible, composition and technique designed according to this invention, all can reach target capabilities requirement, have good comprehensive mechanical property, and carbon equivalent is lower, is conducive to improve steel pipe forming welding and site girth welding welding performance.Composition of the present invention is simple in addition, and process window is wider, has stronger manufacturability.
For 625MPa grade super strength UOE welded tube, can be applicable to natural-gas transfer pipeline construction, also can be used for ocean platform and other structural member and build.For long distance pipeline construction, 625MPa grade super strength welded tube not only can reduce steel using amount, can improve discharge pressure simultaneously, is conducive to the conveying capacity of riser tubing; For structural member application, can reduce equally steel using amount, there is higher bearing capacity simultaneously, be applicable to more large-scale equipment and build.In addition, the fierce pipe of 625MPa level superelevation, in the application in offshore platform structure part and pipe-line field, meets the demand of world's low-carbon economy and sustainable development, has a good application prospect.
Claims (7)
1. a 625MPa level UOE welded tube, its chemical component weight percentage is C:0.015～0.080%, Si:0.1～0.5%, Mn:1.40～2.20%, P≤0.015%, S≤0.003%, Nb:0.03～0.10%, Ti:0.01～0.035%, Cu+Ni:0.20～0.50%, and Cu/Ni:1～2, Cr+Mo:0.3～0.6%, Ca:0.001～0.005%, Al:0.02～0.045%, N≤0.010%, O≤0.008%, all the other are Fe and are inevitably mingled with.
2. the manufacture method of 625MPa level UOE welded tube as claimed in claim 1, is characterized in that, comprises the steps:
1) smelt continuous casting
Smelt by composition claimed in claim 1, through smelting-LF+RH external refining-continuous casting, obtain the continuous casting steel billet of 200～300mm thickness specification;
2) heating: slab 1070～1200 DEG C of heating-up temperatures again;
3) roughing: roughing stops temperature and is >=960 DEG C; Intermediate blank is thick: the thick 4t～8t of intermediate blank, and t is final finished thickness, mm;
4) finish rolling: finishing temperature is 730～820 DEG C;
5) DQ direct quenching is cooling: final cooling temperature is 350～450 DEG C, cooling rate >=30 DEG C/s;
6) ACC is cooling fast: final cooling temperature is 80～350 DEG C, cooling rate >=15 DEG C/s;
7) steel pipe forming welding, comprises steel pipe forming-UO moulding, steel-pipe welding; O forming compressibility is 0.18～0.22%, wherein, and width × 100% behind O forming compressibility=(width behind π × (pre-postwelding external diameter-wall thickness)-milling limit)/milling limit;
8) hole enlargement is E moulding: the steel pipe total length after welding is carried out to hole enlargement, and to meet the final cast requirement of steel pipe, enlarging rate scope is 0.8%～1.2%,
Wherein, outer diameter of steel pipes × 100% before enlarging rate=(the front outer diameter of steel pipes of outer diameter of steel pipes-enlarging after hole enlargement)/hole enlargement.
3. 625MPa level UOE welded tube as claimed in claim 1 and manufacture method thereof, is characterized in that step 7) the front preparation of steel pipe forming welding weldering, comprising:
1) starting weld tab welding: in four corner welding striking steel plates of steel plate, striking effect while being mainly used in welding;
2) milling limit, groove size: by divided edge of steel plate size design.
4. 625MPa level UOE welded tube as claimed in claim 1 and manufacture method thereof, is characterized in that step 7) welded tube forming in steel pipe forming welding, comprise,
1) C moulding: claim again crimp moulding, on crimp forming machine, the limit portion of steel plate is bent to required shape by beader, guarantee the straight section minimum of edges of boards in O forming process;
2) forming U shaped articles: on forming U shaped articles machine, by the steel plate of pre-flanging through being once pressed into " U " type;
3) O forming: on O forming machine, by the steel plate after forming U shaped articles through being once pressed into " O " type;
4) high pressure water washing and oven dry: by being that the inner and outer surface that welds the steel pipe that cracks carries out high pressure water washing after moulding, remove the pollutions such as iron scale, grease, dust; After flushing completes, enter immediately drying oven and carry out drying and processing, bake out temperature is 100 DEG C～300 DEG C.
5. 625MPa level UOE welded tube as claimed in claim 1 and manufacture method thereof, is characterized in that step 7) steel-pipe welding in steel pipe forming welding, comprising:
1) prewelding: to the steel pipe that cracks after O forming, make its opposite side accurately to its, location, and adopt CO
2or Ar+CO
2continuous prewelding welding is carried out in protection weldering, to ensure arc stability in follow-up interior weldering, outside weld process, guarantees final welding quality;
2) weldering in:
For 10.0～15.0mm wall thickness specifications welded tube, adopt three submerged welding processes to carry out weldering welding in steel pipe, the 1st is DC reverse connection, and the 2nd, 3 is interchange, and gage of wire is 3.5～4.5mm; The 1st electric current is 550～650A, and voltage is 22～30V; 2nd, 3 electric currents are 450～600A, and voltage is 30～40V;
For 15.1～20.0mm wall thickness specifications welded tube, adopt four submerged welding processes, the 1st electric current is DC reverse connection, and the 2nd, 3,4 is interchange, and gage of wire is 3.5～4.5mm; The 1st in order to exchange reversal connection, electric current is 1100～1200A, and voltage is 28～40V; 2nd～4 electric currents are that 500～700A, voltage are 34～42V;
Welding speed is 1.5～1.9m/min; Interior weldering solder flux all need be dried within the scope of 250～450 DEG C, drying time >=2 hour;
3) outside weld:
For 10.0～15.0mm wall thickness specifications welded tube, adopt three submerged welding processes to carry out weldering welding in steel pipe, the 1st is DC reverse connection, and the 2nd, 3 is interchange, and gage of wire is 3.5～4.5mm; The 1st electric current is 850～1000A, and voltage is 30～40V; 2nd, 3 electric currents are 450～650A, and voltage is 35～45V;
For 15.1～20.0mm wall thickness specifications welded tube, adopt four submerged welding processes, the 1st electric current is DC reverse connection, and the 2nd, 3,4 is interchange, and gage of wire is 3.5～4.5mm; The 1st electric current is 1100～1200A, and voltage is 28～40V; 2nd～4 electric currents are that 500～700A, voltage are 34～42V;
Welding speed is 1.3～1.8m/min; Outer-welding welding flux all need be dried within the scope of 250～450 DEG C, drying time >=2 hour.
6. 625MPa level UOE welded tube as claimed in claim 1 and manufacture method thereof, is characterized in that, seam inspection after welding, comprises,
Welding line ultrasonic flaw detection: adopt ultrasonic detection method, detect postwelding crackle, layering, the weld defect such as lack of penetration;
Weld seam x-ray inspection: adopt x-ray inspection method, the point-like weld defect such as detect postwelding bubble, be mingled with.
7. 625MPa level UOE welded tube as claimed in claim 1 and manufacture method thereof, is characterized in that step 8) comprise the steps: after hole enlargement
8) welding line ultrasonic flaw detection: adopt ultrasonic detection method, detect crackle after hole enlargement, layering, the weld defect such as lack of penetration;
9) weld seam X-ray examination: adopt x-ray inspection method, the point-like weld defect such as detect bubble after hole enlargement, be mingled with;
10) chamfered edge: tack, chamfered edge processing are carried out in steel pipe two ends, for job site butt welding offers convenience;
11) pipe end layering ultrasonic flaw detection: the steel tube end part after chamfered edge is carried out to ultrasonic flaw detection test, prevent lamination defect;
12) pipe end magnetic particle flaw detection: the steel tube end part after chamfered edge is carried out to magnetic powder detection, prevent lamination defect;
13) upper guard ring: pipe end is protected, guaranteed the butt welding quality in steel pipe site operation process.
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| CN113423846B (en) * | 2019-02-21 | 2022-09-20 | 日本制铁株式会社 | Use method of high-strength electric welding steel pipe and high-strength electric welding steel pipe for foundation stabilization engineering |
| CN109735769A (en) * | 2019-03-14 | 2019-05-10 | 南京钢铁股份有限公司 | A kind of B grades of acid-resistant pipeline steel plate and pipe-making method |
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