CN101353766A - Grooving corrosion resistant high strength steel for ERW soldering sleeve, sleeve and production method - Google Patents
Grooving corrosion resistant high strength steel for ERW soldering sleeve, sleeve and production method Download PDFInfo
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Abstract
The invention provides a steel used for a guttering corrosion resistant high-strength ERW welding socket, and the chemical compositions of which by weight percentage are as follows: 0.15 percent to 0.25 percent of C, 0.05 percent to 0.4 percent of Si, 0.7 percent to 1.5 percent of Mn, less than or equal to 0.1 percent of P, less than 0.005 percent of S, 0.005 percent to 0.03 percent of Ti, 0.005 percent to 0.04 percent of Nb, 0.005 percent to 0.04 percent of V, 0.1 percent to 0.7 percent of Cr, 0.1 percent to 0.30 percent of Cu, 0 percent to 0.003 percent of B, 0.002 percent to 0.04 percent of Al and 0.001 to 0.01 percent of Ca, and the rest are Fe and other unavoidable impurities. The invention also provides a cannula prepared by adopting the steel and a manufacturing method thereof. The steel of the invention has excellent performance of guttering corrosion resistance and does not contain expensive alloying elements such as Mo and Ni and the like, therefore, the cost of the cannula is low.
Description
Technical field
The present invention relates to a kind of anti-guttering corrosion high-strength electric resistance welded (ERW) welded casing steel, high-strength electric resistance welded (ERW) welded casing of anti-guttering corrosion and production method thereof.
Background technology
Petroleum and natural gas is exploited with sleeve pipe generally speaking according to API (API) the normal structure production and the supply of material.API standard code, petroleum casing pipe have two types of seamless tube and welded tubes.For seamless tube, welded tube has distinguishing features such as production efficiency height, dimensional precision is good, specification limit is wide, cost is low, is manufacturer and oil field user's first-selected kind therefore, is subjected to the favor in market always.The N80 steel-grade bushing is a kind of High Tensile Steel Tube, according to the API standard code, and its yield strength R
0.5Must be between 552～758MPa, tensile strength R
mMust be greater than 689MPa.
The high strength welded casing is easy to take place guttering corrosion.Guttering corrosion is a kind of corrosion phenomenon that ERW welded tube welding zone produces, and forms the selective corrosion of channel form usually near weld seam, causes the welded tube inefficacy of boring a hole too early.ERW telescopic production technique is: steel-making → continuous casting → be rolled into coiled sheet → coiled sheet to shear butt welding → strip moulding → online welding → weld seam thermal treatment or homogeneous tube thermal treatment → pipe processing → factory inspection etc. end to end.It is the critical process that realizes the multireel continuous production, embodies ERW welded tube production efficiency that coiled sheet is sheared the butt welding operation end to end.But coiled sheet flat welding process end to end is low to the carbon equivalent palpus of material, otherwise causes the steel plate broken belt easily, has a strong impact on production efficiency.Can realize the high-intensity performance requriements of welded tube product by two kinds of approach.
A kind of is by the thermal treatment of postwelding homogeneous tube.Such as can make product reach the level of 80 grade of steels by modifier treatment, because weld seam and body have experienced phase transformation simultaneously, homogeneous tube thermal treatment can effectively alleviate weld seam and the structural difference of body, eliminates unrelieved stress, thereby improves the anti-guttering corrosion performance of telescopic.But homogeneous tube is modified to have a significant disadvantages, one, requires manufacturer to have the heat treated support equipment of homogeneous tube on equipment.If manufacturer does not have associated equipment, then can not produce high strength casing; Two, the diameter of ERW welded tube is generally all greater than 219mm, quenching will cause the increase of sleeve pipe out of roundness, though can be through alignment, the existence of " Bauschinger effect " must make welded casing lose the high anti-crowded characteristic of its " born ", thereby has reduced the advantage on the welded casing dimensional precision; Three, because through homogeneous tube thermal treatment, the telescopic production cost obviously improves, and has reduced the market competition advantage of welded casing.
The another kind of method that realizes that high-intensity performance requires is at first to obtain high-intensity hot-rolled steel sheet, after the welding only butt welded seam heat-treat.Like this, improve the ability of the anti-guttering corrosion of weld seam on the one hand, make again that on the other hand weld seam reaches desired intensity.This mode does not have the unfavorable factor that homogeneous tube thermal treatment is brought, but, weld seam thermal treatment can't be eliminated the macroscopic unrelieved stress of introducing because of the strip moulding, under the effect of this stress, because of inevitably there are structural difference in commissure and body, so very easily cause the generation of guttering corrosion.
From last century the seventies so far, develop the target that the Welded Steel Pipe with good anti-guttering corrosion performance is the diligent pursuit of several generations Materials science worker.As table 1, patent JP54097522A and JP61124552A disclose a kind of production method of anti-guttering corrosion Welded Steel Pipe, the alloy that uses be the ultralow-carbon ferritic structure because the hardness of steel pipe is very low, the poor performance of anti-stick button is not suitable for producing petroleum casing pipe; The employed alloying constituent of patent JP54097524A, JP56123349A and JP57104648A does not contain Ti, Nb, V, Cr, Cu or only contains strengthening elements such as minor N b, and steel strength is lower, can't realize producing the requirement of high grade of steel welded casing; Patent JP56035749A does not contain above-mentioned element, though can realize high-intensity requirement, and Si is up to 1%, the commissure forms greyness easily during welding, has a strong impact on weldquality, and carbon equivalent can't realize shearing the requirement of butt welding up to 0.8; Patent JP09029460A, JP54097523A, JP56069354A and the JP59047364A that has added Cu respectively with P, Ti, Nb or V as strengthening element, also may realize producing the requirement (all embodiment as patent JP56069354A only reach 70 grade of steels) of high strength casing by controlled chilling, but owing to do not contain Cr, realizing the high-intensity while possessing the ability of good anti-guttering corrosion; And patent JP57131346A, JP58093855A and JP59096244A contain expensive Ni element, and cost of alloy is higher, and the Si content of JP57131346A and JP58093855A is higher in addition, is difficult to obtain good Weld Performance; The disclosed high-intensity Welded Steel Pipe of patent US4772771A and JP60187663A, its actual strength also only reaches 70 grade of steels, the alloying elements such as Cr, Cu that do not contain anti-guttering corrosion, and the content of the S of one of key element of influencing the guttering corrosion performance is not made restriction, do not have the ability of anti-guttering corrosion performance.In addition, the listed japanese product of table 1 also contains expensive Mo element except the ability that does not have anti-guttering corrosion performance, and the cost of institute's production casing is too high.
Therefore, for overcoming above deficiency, the object of the invention provides a kind of high-strength electric resistance welded (ERW) welded casing steel of anti-guttering corrosion, makes it possess the high-intensity good welding property that has simultaneously.
Simultaneously, the invention provides the sleeve pipe that adopts above-mentioned steel to produce, with satisfy produce in to the requirement of high strength and welding property.
In addition, the invention provides above-mentioned telescopic production method, technology is simple, is convenient to operation.
Summary of the invention
The object of the present invention is achieved like this:
The invention provides a kind of grooving corrosion resistant high strength steel for ERW soldering sleeve, its chemical ingredients mass percent is as follows: C:0.15～0.25; Si:0.05～0.4; Mn:0.7～1.5; P :≤0.1; S:＜0.005; Ti:0.005～0.03; Nb:0.005～0.04; V:0.005～0.04; Cr:0.1～0.7; Cu:0.1～0.3; B:0～0.003; Al:0.002～0.04; Ca:0.001～0.01, all the other are Fe and inevitable impurity.
Design of alloy mechanism of the present invention is described as follows:
Carbon C:C content too high, guttering corrosion susceptibility increases, and by weight percentage, C content should not be greater than 0.25, but the too low intensity that will diminish material of C content, the anti-stick button poor performance of telescopic should adopt carbon content 0.15～0.25.
Manganese Mn: mainly be dissolved in ferrite and play strengthening effect, but with the refinement ferrite crystal grain, but content when too high segregation serious, by weight percentage, should adopt Mn content is 0.7～1.5.
Silicon Si: deoxidant element, solid solution improving the yield strength of steel, but will lose plasticity and toughness in ferrite simultaneously, produce the major cause of welding greyness when being welding.By weight percentage, should adopt silicone content is 0.05～0.4.
Phosphorus P: can improve the ability of the anti-guttering corrosion of material, but solid solution simultaneously in ferrite improving the intensity of material, but too high levels can diminish the plasticity of material, adopts the phosphorus content should not be greater than 0.1.
Sulphur S: combine generation MnS with Mn, assemble in the commissure during welding, severe exacerbation guttering corrosion performance, content is low more good more, will improve the smelting cost of material greatly but cross to hang down, and taking all factors into consideration should not be greater than 0.005.
Chromium Cr: be the strong carbide forming element, can improve the anti-guttering corrosion ability of material, steel plate carbide precipitate when cooling improves the intensity of steel, by weight percentage, should adopt content 0.1～0.7.
Copper Cu: can improve the corrosion resistance nature of steel, be insoluble to α-Fe substantially in room temperature, and separate out, and steel is strengthened with the form of ε-Cu or face-centered cubic α-Cu.By weight percentage, should adopt content 0.1～0.3.
Aluminium Al: traditional deoxidant element, can improve the corrosion resistance nature of steel, can also improve the strength of materials by forming AlN refine austenite crystal grain, by weight percentage, should adopt content 0.01～0.05.
Titanium Ti: strong carbonitride forming element, forming TiN, TiC all can refine austenite crystal grain in soaking and reheat process, improves the mechanical property of weld seam; If content is too high, easily form thick TiN, do not reach the purpose of interpolation.By weight percentage, should adopt content 0.005～0.03.
Niobium Nb: can postpone austenite recrystallization during hot rolling and reach the purpose of crystal grain thinning, in cooling and course of hot rolling subsequently, Nb (C, N) particle dispersion is separated out, and can play the effect of precipitation strength again.In welding process, can improve the mechanical property of weld seam, by weight percentage, should adopt content 0.005～0.04.
Vanadium V: the carbonitride of vanadium is separated out in ferrite, can improve the intensity of material in the process of controlled chilling, helps improving the corrosion resistance of material simultaneously, by weight percentage, should adopt content 0.005～0.04.
Boron: gather partially in austenite grain boundary to suppress separating out of proeutectoid ferrite, make carbide separate out in the cold zone even dispersion.Too high levels can form thick BN, reduces the effect of B.By weight percentage, should adopt content 0～0.003.
Calcium Ca: cleaning molten steel, make inclusion modification with control sulfide distributional pattern, reach the purpose that obtains the uniform sulfide of tiny sphere, disperse, by weight percentage, should adopt content 0.001～0.01..
According to grooving corrosion resistant high strength steel for ERW soldering sleeve of the present invention, wherein be described composition of steel carbon equivalent Ceq≤0.5 preferably.The requirement of shearing butt welding can be satisfied in design mix carbon equivalent Ceq≤0.5.
The present invention also provides a kind of anti-guttering corrosion high strength ERW welded casing, is the sleeve pipe that adopts above-mentioned steel to produce, and its chemical ingredients mass percent is as follows: C:0.15～0.25; Si:0.05～0.4; Mn:0.7～1.5; P :≤0.1; S:＜0.005; Ti:0.005～0.03; Nb:0.005～0.04; V:0.005～0.04; Cr:0.1～0.7; Cu:0.1～0.3; B:0～0.003; Al:0.002～0.04; Ca:0.001～0.01, all the other are Fe and inevitable impurity.
According to anti-guttering corrosion high strength ERW welded casing of the present invention, wherein be described sleeve pipe composition carbon equivalent Ceq≤0.5 preferably.The requirement of shearing butt welding can be satisfied in design mix carbon equivalent Ceq≤0.5.
The present invention also provides the production method of anti-guttering corrosion high strength ERW welded casing, comprise smelting, casting, rolling, cool off, coil into plate, welding fabrication, thermal treatment, shearing and pipe processing, wherein, rolling temperature is 1200～1300 ℃ in the described production method, and whole Zha Wendu is 850～950 ℃; Speed of cooling is 2～30 ℃/s, is cooled to 500～620 ℃ and coils into plate; Thermal treatment temp is 950 ± 50 ℃.
According to above-mentioned alloy designs scheme, molten steel is through converter or electrosmelting, and slab is made in casting; Slab rolls into strip after 1200～1300 ℃ of heating, the finishing temperature of strip is rolled the back strip and cooled off through laminar flow between 850～950 ℃, is cooled to 500～620 ℃ with the speed of 2～30 ℃/s and coils into coiled sheet.
Production method according to anti-guttering corrosion high strength ERW welded casing of the present invention wherein is that described thermal treatment adopts the load coil butt welded seam to carry out normalizing thermal treatment preferably.Behind the welding fabrication, use the load coil butt welded seam to carry out normalizing thermal treatment, induction heating temperature is 950 ± 50 ℃, and steel pipe is through shearing, and the line pipe of going forward side by side processing obtains the N80 sleeve pipe with good anti-guttering corrosion performance.
In sum, the present invention adopts suitable carbon content in the material design, keep suitable Mn content, for reducing the susceptibility of material to guttering corrosion, add alloying elements cr, Cu, based on this, add microalloy element Ti, Nb, V reaches the problem that reduces the undercapacity that causes because of carbon content that remedies, optimize the structure property of material in conjunction with the effect of Ti with B, handle with cleaning molten steel through calcium, by smelting, casting, rolling, cooling, coil into plate, welding fabrication, thermal treatment, shear and series of processes such as pipe processing, the final acquisition carbon equivalent that meets the requirements is moderate and have a good resistance guttering corrosion performance, high-intensity N80 grade of steel ERW sleeve pipe.
The present invention compared with prior art has following advantage:
1, alloying constituent carbon equivalent of the present invention is moderate, makes full use of the effect of alloying element, not only have good anti-guttering corrosion performance, and alloy content is low;
2, do not contain expensive alloying element such as Mo, Ni, only through weld seam thermal treatment, the sleeve pipe cost is not high, has great economic and social benefit.
Below with embodiment the present invention is described in greater detail.These embodiment only are the descriptions to best mode for carrying out the invention, scope of the present invention are not had any restriction.
Embodiment
Below in conjunction with embodiment and Comparative Examples, be described more specifically the present invention.
Embodiment 1
Present embodiment casing steel chemical ingredients mass percent is: C:0.16; Si:0.27; Mn:1.33; P:0.007; S:0.004; Ti:0.025; Nb:0.035; V:0.011; Cr:0.33; Cu:0.13; B:0.0022; Al:0.036; Ca:0.007, all the other are Fe and inevitable impurity.
After Ca handled, continuous casting became base with the molten steel after converter smelting, the external refining.Continuously cast bloom is rolled into strip after 1200～1250 ℃ of heating, finishing temperature is greater than 850 ℃, and strip is cooled to 570 ℃ through laminar flow and coils into coiled sheet after rolling.After shearing butt welding, coiled sheet moulding, ERW tubulation, butt welded seam carries out the induction heating normalizing treatment, and Heating temperature is 930 ℃, be 20～60s heat-up time, last steel pipe is through shearing, and the line pipe of going forward side by side is processed, and produces the N80 electric resistance welding petroleum sleeve pipe of anti-guttering corrosion of the present invention.
After testing, present embodiment sleeve pipe mechanical property result is as follows: R
0.5Be 687MPa, 683MPa; R
mBe 756MPa, 766MPa.
Weigh the quality of guttering corrosion performance by the electrochemical test method.This method is that the sample that will contain the ERW weld seam is immersed in the 3.5%NaCl aqueous solution, then it is applied anodic polarization, when reaching given current potential φ, polarizes and takes out after 6 days, then the uniform corrosion depth d 2 of specimen and guttering corrosion depth d 1.With the guttering corrosion factor alpha, α=d1/d2 represents that the guttering corrosion of welded tube is inclined to.Generally speaking, with the line of delimitation of α=1.3 as the anti-guttering corrosion performance quality of measurement.In the experiment, the current potential when the φ value is 50mv for the anode overpotential.
After testing, present embodiment telescopic guttering corrosion sensitivity coefficient α=1.23.
Embodiment 2
Present embodiment casing steel chemical ingredients mass percent is: C:0.18; Si:0.27; Mn:1.24; P:0.007; S:0.004; Cr:0.22; Cu:0.24; Nb:0.024; V:0.022; Ti:0.019; B:0.0018; Al:0.029; Ca:0.007, all the other are Fe and inevitable impurity.
Other are with embodiment 1.
After testing, present embodiment sleeve pipe mechanical property result is as follows: R
0.5Be 666MPa, 681MPa; R
mBe 776MPa, 764MPa.
After testing, present embodiment telescopic guttering corrosion sensitivity coefficient α=1.12.
Embodiment 3
Present embodiment casing steel chemical ingredients mass percent is: C:0.19; Si:0.25; Mn:1.18; P:0.007; S:0.004; Cr:0.32; Cu:0.20; Nb:0.021; V:0.021; Ti:0.017; Al:0.047; Ca:0.007, all the other are Fe and inevitable impurity.
Other are with embodiment 1.
After testing, present embodiment sleeve pipe mechanical property result is as follows: R
0.5Be 621MPa, 614MPa; R
mBe 709MPa, 701MPa.
After testing, present embodiment telescopic guttering corrosion sensitivity coefficient α=1.05.
Embodiment 4
Present embodiment casing steel chemical ingredients mass percent is: C:0.21; Si:0.31; Mn:0.80; P:0.008; S:0.002; Cr:0.61; Cu:0.18; Nb:0.020; V:0.035; Ti:0.01; Al:0.04; Ca:0.004, all the other are Fe and inevitable impurity.
Other are with embodiment 1.
After testing, present embodiment sleeve pipe mechanical property result is as follows: R
0.5Be 558MPa, 563MPa; R
mBe 699MPa, 713MPa.
After testing, present embodiment telescopic guttering corrosion sensitivity coefficient α=1.15.
Embodiment 5
Present embodiment casing steel chemical ingredients mass percent is: C:0.24; Si:0.29; Mn:0.90; P:0.08; S:0.003; Cr:0.48; Cu:0.17; Nb:0.012; V:0.025; Ti:0.01; Al:0.04; Ca:0.006, all the other are Fe and inevitable impurity.
Other are with embodiment 1.
After testing, present embodiment sleeve pipe mechanical property result is as follows: R
0.5Be 637MPa, 750MPa; R
mBe 814MPa, 896MPa.
After testing, present embodiment telescopic guttering corrosion sensitivity coefficient α=1.21.
Comparative example 1
This comparative example casing steel chemical ingredients mass percent is: C:0.18; Si:0.26; Mn:1.23; P:0.007; S:0.005; Cr:0.24; Cu:0.22; Al:0.024; Ca:0.008, all the other are Fe and inevitable impurity.
After Ca handled, continuous casting became base with the molten steel after converter smelting, the external refining.Continuously cast bloom is rolled into strip after 1200～1250 ℃ of heating, finishing temperature is greater than 850 ℃, and strip is cooled to 570 ℃ through laminar flow and coils into coiled sheet after rolling.After shearing butt welding, coiled sheet moulding, ERW tubulation, butt welded seam carries out the induction heating normalizing treatment, and Heating temperature is 930 ℃, and be 20～60s heat-up time, and last steel pipe is through shearing, and comparative example petroleum casing pipe required for the present invention is produced in the line pipe of going forward side by side processing.
After testing, this comparative example sleeve pipe mechanical property result is as follows: R
0.5Be 428MPa, 412MPa; R
mBe 540MPa.
Comparative example 2
This comparative example casing steel chemical ingredients mass percent is: C:0.17; Si:0.26; Mn:1.15; P:0.007; S:0.003; Nb:0.019; V:0.17; Ti:0.26; Al:0.041; Ca:0.008, all the other are Fe and inevitable impurity.
Other are with comparative example 1.
After testing, this comparative example sleeve pipe mechanical property result is as follows: R
0.5Be 510MPa, 519MPa; R
mBe 632MPa, 627MPa.
Comparative example 3
This comparative example casing steel chemical ingredients mass percent is: C:0.18; Si:0.25; Mn:1.16; P:0.007; S:0.002; Cr:0.21; Nb:0.018; V:0.021; Ti:0.018; Al:0.045; Ca:0.008, all the other are Fe and inevitable impurity.
Other are with comparative example 1.
After testing, this comparative example sleeve pipe mechanical property result is as follows: R
0.5Be 525MPa, 531MPa; R
mBe 636MPa, 642MPa.
Comparative example 4
This comparative example casing steel chemical ingredients mass percent is: C:0.17; Si:0.26; Mn:1.18; P:0.007; S:0.003; Cr:0.21; Nb:0.021; V:0.022; Ti:0.019; B:0.0022; Al:0.045; Ca:0.009, all the other are Fe and inevitable impurity.
Other are with comparative example 1.
After testing, this comparative example sleeve pipe mechanical property result is as follows: R
0.5Be 475MPa, 521MPa; R
mBe 622MPa, 635MPa.
Comparative example 5
This comparative example casing steel chemical ingredients mass percent is: C:0.24; Si:0.30; Mn:1.5; P:0.008; S:0.004; Nb:0.06; Ti:0.025; Al:0.04; Ca:0.008; Mo:0.25, all the other are Fe and inevitable impurity.
Other are with comparative example 1.
After testing, this comparative example sleeve pipe mechanical property result is as follows: R
0.5Be 631MPa, 559MPa; R
mBe 826MPa, 767MPa.
Weigh the quality of guttering corrosion performance by the electrochemical test method.This method is that the sample that will contain the ERW weld seam is immersed in the 3.5%NaCl aqueous solution, then it is applied anodic polarization, when reaching given current potential φ, polarizes and takes out after 6 days, then the uniform corrosion depth d 2 of specimen and guttering corrosion depth d 1.With the guttering corrosion factor alpha, α=d1/d2 represents that the guttering corrosion of welded tube is inclined to.Generally speaking, with the line of delimitation of α=1.3 as the anti-guttering corrosion performance quality of measurement.In the experiment, the current potential when the φ value is 50mv for the anode overpotential.
After testing, this comparative example telescopic guttering corrosion sensitivity coefficient α=1.50.
By the foregoing description and comparative example as can be seen, the intensity of embodiment 1～5 all satisfies yield strength (R
0.5) between 552～758MPa, tensile strength (R
mThe high-intensity requirement of) 〉=689MPa, and the guttering corrosion factor alpha all is lower than 1.3, has good anti-guttering corrosion performance.Comparative example 1 does not have strengthening elements such as Ti, Nb, V, and comparative example 2～4 does not contain reinforcement and corrosion-resistant elements such as Cu, and the mechanical property of material does not reach the requirement of strength of N80 grade of steel.Comparative example 5 contains valuable Mo element, the qualified but anti-guttering corrosion poor-performing of mechanical property.As seen, adopt designed chemical ingredients and the process system of the present invention, can produce the high-intensity N80ERW sleeve pipe of anti-guttering corrosion.
Claims (6)
1, grooving corrosion resistant high strength steel for ERW soldering sleeve is characterized in that, (wt%) is as follows for its chemical ingredients:
C:0.15～0.25; Si:0.05～0.4; Mn:0.7～1.5; P :≤0.1; S:＜0.005; Ti:0.005～0.03; Nb:0.005～0.04; V:0.005～0.04; Cr:0.1～0.7; Cu:0.1～0.3; B:0～0.003; Al:0.002～0.04; Ca:0.001～0.01, all the other are Fe and inevitable impurity.
2, grooving corrosion resistant high strength steel for ERW soldering sleeve as claimed in claim 1 is characterized in that, described composition of steel carbon equivalent Ceq≤0.5.
3, anti-guttering corrosion high strength ERW welded casing is the sleeve pipe that adopts steel as claimed in claim 1 to produce, and it is characterized in that (wt%) is as follows for its chemical ingredients:
C:0.15～0.25; Si:0.05～0.4; Mn:0.7～1.5; P :≤0.1; S:＜0.005; Ti:0.005～0.03; Nb:0.005～0.04; V:0.005～0.04; Cr:0.1～0.7; Cu:0.1～0.3; B:0～0.003; Al:0.002～0.04; Ca:0.001～0.01, all the other are Fe and inevitable impurity.
4, anti-guttering corrosion high strength ERW welded casing as claimed in claim 3 is characterized in that, described sleeve pipe composition carbon equivalent Ceq≤0.5.
5, the production method of anti-guttering corrosion high strength ERW welded casing as claimed in claim 3, comprise smelting, casting, rolling, cool off, coil into plate, welding fabrication, thermal treatment, shearing and pipe processing, it is characterized in that, rolling temperature is 1200～1300 ℃ in the described production method, and whole Zha Wendu is 850～950 ℃; Speed of cooling is 2～30 ℃/s, is cooled to 500～620 ℃ and coils into plate; Thermal treatment temp is 950 ± 50 ℃.
6, the production method of anti-guttering corrosion high strength ERW welded casing as claimed in claim 5 is characterized in that, described thermal treatment adopts the load coil butt welded seam to carry out normalizing thermal treatment.
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| JPS61272318A (en) * | 1985-05-28 | 1986-12-02 | Nippon Steel Corp | Manufacture of seam welded steel pipe for high strength oil well pipe |
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