CN100537816C - The petroleum steel pipe of anti-H 2 S stress corrosion and manufacture method thereof - Google Patents
The petroleum steel pipe of anti-H 2 S stress corrosion and manufacture method thereof Download PDFInfo
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Abstract
The invention provides a kind of petroleum steel pipe of anti-H 2 S stress corrosion, the weight % of its composition is C 0.25～0.32%, and Si 0.10～0.40%, and Mn 0.60～1.20%, P≤0.020%, S≤0.010%, Ni≤0.25%, Cr 0.55～1.20%, Mo 0.10～0.50%, Cu≤0.30%, Al 0.010～0.040%, and surplus is Fe.Its production method is that this steel pipe adopts steel scrap and sponge iron or molten iron to do steelmaking feed, and after electric arc furnace smelting, external refining and vacuum outgas, continuous casting becomes the circle base, after being rolled into weldless steel tube, heat-treating and quenches and tempering again, makes sleeve pipe and oil pipe at last.Beneficial effect is that this steel pipe has good physicochemical performance, its index all meets or exceeds the API standard, its anti-H 2 S stress corrosion threshold value σ th reaches 90%SMYS, is better than the requirement of standard specifications anti-H 2 S stress corrosion threshold value, can be widely used in containing in the oil-gas field of hydrogen sulfide.
Description
Technical field
The present invention relates to anti-H 2 S stress corrosion petroleum steel pipe and manufacture method thereof that a kind of yield strength is lower than 758MPa (110ksi).
Background technology
About 1/3 contains hydrogen sulfide in world's oil-gas field.Common steel tube is when being used for the exploitation of hydrogen sulfide containing hydrocarbon resources, steel pipe is under the effect of service stress and hydrogen sulfide, tend to brittle failure (this phenomenon is called H 2 S stress corrosion) take place during far below itself yield strength suddenly stressed, the lighter causes Steel Cylindrical Column or whole mouthful of well to scrap, weight person can cause blowout, make hydrogen sulfide together excessive, cause whole bench drill machine to reach the considerable damage of ecotope on every side with oil gas.Therefore, exploit hydrogen sulfide containing hydrocarbon resources and just must use the anti-H 2 S steel pipe.
All contain hydrogen sulfide in the hydrocarbon zone in oil fields such as many oil fields of China such as Sichuan, long celebrating, North China, Xinjiang, wherein especially with Sichuan oilfield for very, it is to corrode one of the most serious oil-gas field in the world.The Barrow house oil field of the many hydrogen sulfide containing oil-gas fields such as the U.S., Canadian truncation that oil field, gulf are abroad also arranged.
The anti-H 2 S steel pipe is the product of high technology content, its production technology worldwide is regarded as top technology and holds in close confidence, only, suddenly wait to develop the anti-H 2 S steel pipe in the market by the monopolizations such as U.S. steel connection of the Sumitomo Metal Industries of minority advanced person's large-scale steel pipe enterprise such as Japan, NKK, the U.S..But,, therefore on producing, very high technical difficulty is arranged because 95Ksi grade of steel and following steel grade sulfur resistant hydrogen steel pipe are in the most responsive interval of H 2 S stress corrosion because of its intensity.The also complete dependence on import of China's anti-H 2 S steel pipe, especially high anti-H 2 S steel pipe is all the more so.95Ksi and following steel grade sulfur resistant hydrogen steel pipe are because its high technology content thereby added value height, the import price costliness, domestic annual this type of steel pipe of cost great number foreign exchange import, but also must accept harsh supplementary technology secrecy and confidentiality clause, therefore, this serious situation under one's control also is totally unfavorable to the development of China Petroleum.External 95Ksi of dissection and analysis and following steel grade sulfur resistant hydrogen tubing, its composition contains chemical element titanium Ti, niobium Nb and boron etc. mostly.
Analyze the H of molecular state from the hydrogen delayed fracture of corrosive environment and steel pipe
2S generates atomic hydrogen surperficial adsorbed by steel in a large number, and steel pipe uses under strained condition, by stress induced diffusion, atomic hydrogen gathers the inclusion in steel, particularly the MnS of strip is mingled with and the formation high pressure is gathered at some microscopic defect position, causes stress concentration, causes cracking at last.This kind fracture mode belongs to sulfide-stress cracking.
The influence of the intensity antagonism sulfide-stress cracking of steel pipe, the influence of finding intensity antagonism sulfide-stress cracking by a large amount of tests has following rule, when yield strength is less than or equal to 700MPa, along with the increase of yield strength, resisting sulfide stress corrosion crack threshold value also increases; But when yield strength during greater than 700MPa, resisting sulfide stress corrosion crack threshold value sharply descends.Show as in actual the use: when YIELD STRENGTH is lower than the stress corrosion threshold value, stress corrosion does not take place; When yield strength was higher than the stress corrosion threshold value, stress corrosion crack can take place in material under the condition far below material yield intensity.Such as, the yield strength of regulation T95 is 655～758MPa among the API SPEC 5CT, this strength range just in time is in the sensitive area of H 2 S stress corrosion.In order to reduce the susceptibility of this intensity rank steel pipe to H 2 S stress corrosion, improve their anti-H 2 S performance, technical effective measures are to reduce as far as possible or control the unrelieved stress that steel pipe produces well in manufacturing process.
Summary of the invention
The petroleum steel pipe and the manufacture method thereof that the purpose of this invention is to provide a kind of anti-H 2 S stress corrosion are to solve MnS the influence problem totally unfavorable to the steel pipe anti-H 2 S stress corrosion of harmful element such as P, S and strip; Long steel pipe quenching flexural deformation of solution simultaneously and the quality problems that easily crack; Also to solve high strength anti-H 2 S steel pipe at the low technical barrier of H 2 S stress corrosion sensitive area anti-H 2 S stress corrosion threshold value.
For achieving the above object, technical scheme of the present invention is a kind of petroleum steel pipe of anti-H 2 S stress corrosion, and the composition of this steel grade % by weight is: C 0.25～0.32%, Si 0.10～0.40%, Mn 0.60～1.20%, P≤0.020%, S≤0.010%, Ni≤0.25%, Cr 0.55～1.20%, and Mo 0.10～0.50%, Cu≤0.30%, Al 0.010～0.040%, and all the other are Fe.
A kind of method of making the described steel pipe of claim 1 is provided simultaneously, and this method may further comprise the steps:
1. steel-making
Adopt the low high-quality steel scrap of inclusion constituent content to add the composition that sponge iron or molten iron are mixed with the steel grade of claim 1, the utilization electric arc furnace is smelted, and by add the lime making foamed slag in molten steel, fully adsorbs harmful element P, S in the molten steel; Use eccentric bottom tapping, adopt ladle furnace refining+vacuum outgas+bag core silk to feed silk again and handle, carry out external refining; The vacuum outgas time is not less than 10 minutes, and the gas in the molten steel is fully removed, and casts circular steel billet with continuous caster at last;
2. tube rolling
In ring furnace,, use the tapping machine perforation, adopt finish rolling controlled rolling precision heating of pipe blank, rolling by the retained mandrel continuous mill, again by sizing mill or open and to subtract the accurate sizing of machine, after cooling on the cold bed, sawing, cold straightening are at last with the steel pipe process non-destructive test(ing)(NDT) and the finishing of making;
3. steel pipe is handled and processing
Above-mentioned steel pipe is heated to 800～950 ℃ in the quenching process furnace, quench, and is heated to 600～750 ℃ then in the tempering process furnace, carries out high tempering; Adopt high temperature sizing and high-temperature straightening, temperature is controlled at 500～650 ℃, and the high temperature sizing guarantees that deformation rate reaches 3%; By non-destructive test(ing)(NDT), carry out then pipe end car silk, box cupling twist connect, another pipe end car silk, production tube carries out hydrostatic test again, guard ring on two pipe ends sprays mark, paints, box cupling is done copper plating treatment, makes fished pipe at last;
4. the box cupling thread surface is handled.
Effect of the present invention is to adopt the steel pipe of making after above composition and the technology to have good physicochemical performance, use properties and anti-H 2 S stress corrosion performance, and its anti-H 2 S stress corrosion threshold value σ th has reached 90%SMYS (nominal SMYS).This index not only is better than the requirement of API SPEC 5CT standard anti-H 2 S stress corrosion threshold value σ th 80% SMYS, and surpasses the guarantee value that dispatches from the factory of the horizontal threshold value σ of Japanese like product anti-H 2 S stress corrosion th.
Embodiment
The present invention is based on following technological thought and draws: solve high strength anti-H 2 S steel pipe at the low technical barrier of H 2 S stress corrosion sensitive area anti-H 2 S stress corrosion threshold value, the problem that influences that harmful element such as P, S and strip MnS are totally unfavorable to the steel pipe anti-H 2 S stress corrosion, and the quality problems that solve long steel pipe quenching flexural deformation and easily crack simultaneously.Know through experimental analysis, sulfide-stress cracking is in normal temperature time easier generation when ratio is higher or lower than normal temperature, most researchers thinks that cracking sensitivity is the highest 24 ± 3 ℃ the time, and temperature sulfide-stress cracking does not generally take place more than 80 ℃ or 80 ℃ the time.Contain H
2The solution slant acidity of S, pH value was 3～4 o'clock cracking sensitivity maximums.The yield strength of steel or yield tensile ratio are higher, and the cracking sensitivity of sulfide is also bigger, and deformation rate is low, and the sulfide cracking sensitivity increases.
Below in conjunction with each chemical element the influence of sulfide cracking sensitivity is described in detail the process that steel pipe of the present invention is realized.
Mn:Mn promotes harmful element P, S, Sn, Sb etc. to grain boundary segregation, and P, Sn, the Sb etc. that are segregated in crystal boundary with H interaction can take place, thereby the crystal boundary linkage force is descended significantly, cause that easily hydrogen causes along brilliant fracture.Reduce Mn content and can improve anti-H
2The S performance.
P, S:P and S are impurity elements.For improving toughness and solidity to corrosion, reduce its content as far as possible.But must consider the cost of making steel, in order to obtain better anti-H
2The S stress corrosion performance is preferably stipulated P＜0.010%, S＜0.005%.
Cr:Cr is for the CO that slows down
2-H
2S-Cl
-Corrosion speed in the environment is very favourable; Its diffusion carbide of aspect also is the strong trap of hydrogen in addition, so the content of Cr is wanted enough.
Mo: be the most effective anti-H
2The S element, it can form the precipitate of disperse together with S, thereby solid solution S is reduced, in addition the Mo of aspect disperse
2C is the strong trap of hydrogen, can spread rich long-pending hydrogen amount and reduces greatly thereby make.Mo also can hinder the P segregation.
C: antagonism H
2The S influence is little, and the carbon amount considers that mainly intensity and flexible collocation come definite.
Si: be not only reductor, also can improve the intensity of steel, can reduce toughness but add a large amount of silicon, Si is few more, and sulfurated hydrogen stress etching-resisting is just high more, so its content is placed restrictions on below 0.35%.
V: be the element that specially adds, favourable to the tempering intensity that improves steel, but toughness reduces on the contrary during too high levels, so its content is controlled between 0.10～0.15%.
The petroleum steel pipe of anti-H 2 S stress corrosion of the present invention, the chemical ingredients of this steel grade % by weight is: C 0.25～0.32%, and Si 0.10～0.40%, and Mn 0.60～1.20%, P≤0.020%, S≤0.010%, Ni≤0.25%, Cr 0.55～1.20%, Mo 0.10～0.50%, Cu≤0.30%, Al 0.010～0.040%, and all the other are Fe.
Steel pipe of the present invention sees Table 1 with the steel pipe chemical ingredients contrast of other identical grade of steels both at home and abroad.
The steel pipe chemical ingredients contrast table of table 1 anti-H 2 S stress corrosion
The method of making above-mentioned steel pipe may further comprise the steps:
1, steel-making
Adopt the low high-quality steel scrap of inclusion constituent content, the utilization ultra-high power electric arc furnace is smelted, and by add the lime making foamed slag of high reactivity degree in molten steel, fully adsorbs harmful element P, S etc. in the molten steel; Use eccentric bottom tapping, adopt unique Clean Steel technology (ladle furnace refining+vacuum outgas)+Control and Inclusion Removal technology (bag core silk is fed silk and handled) again, carry out external refining.Strict control molten steel chemical ingredients, by making foam white slag technology, the purification molten steel composition, and change inclusion morphology by feeding Si-Ca silk in molten steel, make the MnS of strip be mingled with the spherical complex inclusion that is transformed into Ca; Carry out vacuum outgas then, guarantee that high vacuum time is no less than 10 minutes, the gas in the molten steel is fully removed, reduce to greatest extent that bubble is mingled with in the steel.Cast circular steel billet with continuous caster at last, strict control molten steel overheat, casting speed and cooling water inflow.
2, tube rolling
In ring furnace with heating of pipe blank, the perforation of use tapping machine, adopt unique finish rolling technology, strict controlled rolling precision, rolling by advanced person's retained mandrel continuous mill, again by sizing mill or open and to subtract the accurate sizing of machine, after cooling on the cold bed, sawing, cold straightening, last, with the steel pipe process non-destructive test(ing)(NDT) and the finishing of making.
3, steel pipe is handled and processing
Steel pipe is heated to 800～950 ℃ in the quenching process furnace, quench, and is heated to 600～750 ℃ then in the tempering process furnace, carries out high tempering; Adopt high temperature sizing and high-temperature straightening, temperature is controlled at 500～650 ℃, and the high temperature sizing guarantees that deformation rate reaches 3%; By non-destructive test(ing)(NDT), carry out then pipe end car silk, box cupling twist connect, another pipe end car silk, production tube carries out hydrostatic test again, guard ring on two pipe ends sprays mark, paints, box cupling is done copper plating treatment, makes fished pipe at last.
4, the box cupling thread surface is handled.
The manufacture method of steel pipe of the present invention is achieved in that
1, steel-making
A. Clean Steel technology
150 tons of ultra-high power electric arc furnaces (EAF) eccentric bottom tapping reduces temperature drop and secondary oxidation of steel; Stay steel to stay slag, the difficult ladle that flows into of oxidation sludge.
Foamy slag is smelted, and 150 tons of ladle furnaces (LF) adopt CaO-Al
2O
3High basicity slag adds CaC
2The grain reducing atmosphere is strong, and bag bottom blowing Ar gas mixing is mixed, and the submerged arc heating has good deoxidation, sweetening effectiveness, reduces inclusion.
Below vacuum-treat stove (VD) the condition of high vacuum degree 66.7Pa, the bag BOTTOM ARGON BLOWING keeps more than 10 minutes the hydrogen richness in the steel being taken off below the 2ppm, and oxygen, nitrogen content are low, and sulphur content is low, and inclusion is few, molten steel cleanliness factor height.
B. Control and Inclusion Removal technology
Bag core silk is fed silk and is handled (FW): by changing inclusion morphology to molten steel feeding Si-Ca silk, make the MnS of strip be mingled with the spherical complex inclusion that is transformed into Ca, thereby improve toughness, anisotropic properties, the reduction unrelieved stress of steel, improve the anti-H 2 S stress corrosion performance.
C. continuous casting technology
Continuous casting (CCM) adopts the protection steel pipe that has the Ar hermetic seal, middle covering agent, and the protection casting modern technique of submerged nozzle and crystallizer protecting residue is isolated molten steel and air fully, prevents the secondary oxidation of molten steel in casting cycle.
2, tube rolling
A. finish rolling technology
The ring-like heating of pipe blank stove of computer controlled automatic furnace temperature is accurately controlled the pipe temperature, guarantees that pipe rolls into the stable and dimensional precision of performance behind the pipe.
Quality for all even surfaces externally and internallies of guaranteeing wall thickness is provided with heat centering and dephosphorize by high pressure water simultaneously, is provided with waste pipe internal surface spray borax.
Tube outer diameter and wall thickness accuracy are guaranteed in the design of finish rolling last groove.
B. technology controlling and process
The ring furnace Heating temperature is 1260 ℃, and guarantees that the pipe temperature is even.
The hollow billet wall thickness deviation that the big godet Mannesmann piercing mill of Di Sheer shuts out should be in ± 8%, for rolling hollow forging and production tube have been created the good premise condition.
PQF retained mandrel three-roller tandem rolling tube machine is avoided " ring " phenomenon, removes tube end, and whole thickness of steel pipe inequality be no more than ± and 4%.
Open external diameter and wall thickness accuracy that the reducing sizing mill group guarantees steel pipe, the outer diameter of steel pipes deviation is 0～0.5%D.The aligning unit guarantees that tube bending degree index is less than 1.5mm/m.
3, steel pipe is handled and processing
A. heat treatment technics
Heat-treatment production line carries out modifier treatment to guarantee the performance of steel pipe by accurate control quenching furnance and furnace temperature to steel pipe.Simultaneously, steel pipe finally is organized as tempered sorbite, guarantees that steel pipe has good anti-H 2 S stress corrosion performance.
Heat treatment process parameter: 800～950 ℃ of+600～750 ℃ of high temperings that quench.
B. eliminate the unrelieved stress technology
Adopt the Technology of high temperature sizing and high-temperature straightening, not only guaranteed the external diameter of steel pipe and the precision of circularity, and be the key of the low unrelieved stress of control steel pipe.
The secondary sizing: before hot straightening, carry out the secondary sizing, 500～650 ℃ of sizing temperature, the high temperature sizing guarantees that deformation rate reaches 3%, guarantees to form on steel pipe useful stress.
500～650 ℃ of hot straightening temperature are lower than 500 ℃ as hot straightening and then consider stress relief annealing, 500 ℃ of stress relief annealing temperature.
UT (Ultrasonic Testing): before the flaw detection, with sample pipe off-line verification three times, on-line testing three times.Artificial defect code name N5.
C. the working accuracy technology of steel pipe screw thread
● screw thread processing: adopt the full-automatic numerical control machine for threading to carry out screw thread processing.
● box cupling processing: adopt numerical control box cupling machine for threading to process.
● accuracy of screw machining: can reach 1/2 of API standard code scope.
Car silk: thread size tolerance tapering: 0.063 " ± 0.0015 ", outside closely distance ± 3mm, length of thread ± 3.175mm, screw initial thread are buckled and should be started from edged surface and starting point apart from pipe end 〉=1.2mm.
Box cupling is twisted and to be connect: the tight back of machine guarantee the J value be controlled at+3.175mm ,-the 6.35mm scope in.
The water test: by Zhi Jinhang, 10 seconds steady time.
4, the box cupling thread surface is handled
A. box cupling is done copper plating treatment.
B. the box cupling thread surface is handled.
By the reasonable process of above-mentioned steel pipe manufacturing and the utilization of gordian technique, make the anti-H 2 S steel pipe reach very high quality level, concrete division is as follows:
Chemical Composition
The Chemical Composition check analysis is the result show, steel pipe of the present invention has the low characteristics of harmful element such as composition is even, phosphorus sulphur.Meet the requirement of API SPEC 5CT fully, and satisfied the composition design requirements, thereby have favorable tissue and performance provides precondition for tubing.Steel pipe Chemical Composition statistic analysis result sees Table 2.
Table 2 steel pipe Chemical Composition of the present invention statistic analysis result table
Metallographic structure
The statistics of high power metallographic examination shows that the microstructure of steel pipe of the present invention is even, crystal grain is tiny, nonmetal inclusion content is low.The regulation that meets " oil pipe, steel pipe order additional requirements " fully.Details sees Table 3.
The inclusion of table 3 steel pipe of the present invention and grain fineness number organization table
*: S returns the expression tempered sorbite
Hardening capacity-martensite minimum percentage
According to the regulation of API SPEC 5CT, get the homogeneous tube body sample of an as-quenched condition, as the sign of its situation of hardening, hardening is to embody specification, weight (wall thickness), chemical ingredients and the formed over-all properties of austenitizing/quenching technology.Its hardness value should be equal to or greater than formula HRC
MinimumThe calculated value of=58 * %C+27.This hardness be martensite minimum be 90% o'clock hardness value.Measurement result sees Table 4
Table 4 TP95S steel pipe end quench test data sheet
Mechanical property
On the tubing after the thermal treatment, per 30 draw one group of stretching, impact and hardness sample tests, and each stove mechanical properties test statistics of body sees Table 5.Each stove mechanical properties test statistics of box cupling sees Table 6.
Table 5 steel pipe mechanical properties test of the present invention is cartogram as a result
Table 6 steel pipe box cupling of the present invention mechanical properties test is cartogram as a result
The working accuracy of steel pipe screw thread
Survey steel pipe box cupling of the present invention and body screw thread, its working accuracy height, every index all is controlled at 1/2nd of API franchise.Embodying two most important indexs of steel pipe thread quality characteristic---the concrete parameter of thread taper and tight distance is:
Tight distance: all take off data are all between ± 1.5 buttons.
Thread taper: the box cupling more than 95% and the tapering of pipe thread are between 0.062-0.064in.
The unrelieved stress of anti-H 2 S steel pipe
With the unrelieved stress of the steel pipe of the present invention of slot method and X ray stressometer actual measurement in the 40MPa stress between the 60MPa tensile stress, residual stress level is less than 10% of the actual yield strength of steel pipe.
The anti-H 2 S stress corrosion performance
Anti-H 2 S steel pipe of the present invention carries out the anti-H 2 S stress corrosion test according to the NACETM0177-96A method of NACE TM0175-92 standard code, the result shows that steel pipe of the present invention has good anti-H 2 S stress corrosion performance, and its anti-H 2 S stress corrosion threshold value σ th reaches 90%/SMYS (nominal SMYS).
The steel pipe use properties
Steel pipe of the present invention has carried out the homogeneous tube benchmark test at Americanized mole steel pipe composite force trier, the result shows that this anti-H 2 S steel pipe has excellent use properties, can satisfy the regulation of API5Cl and API5C2 standard fully, meet the service requirements in oil field.The detailed results of use properties test is listed in table 7.
Table 7 steel pipe use properties of the present invention table
| Project | Strength of joint kips | Sealing property psi | Conquassation value kips | Body stretching kips | The anti-stick button performance of sleeve pipe |
| The L80 prescribed value of API | 587/813 | 8160 | 7030 | 676 | The steel pipe screw thread unloads not thread gluing substantially on three times |
| TP80SS | 678/926 | 9793 | 9487 | 811 | The steel pipe screw thread unloads not thread gluing substantially on three times |
| The C90 prescribed value of API | 648/899 | 9180 | 7580/4010 | 760 | The steel pipe screw thread unloads not thread gluing substantially on three times |
| TP90S | 869.1/1043.9 | 11176 | 10348/5628 | 1126 | The steel pipe screw thread unloads not thread gluing substantially on three times |
| The T95 prescribed value of API | 768/948 | 9520/7510 | 7840/4130 | 885 | The steel pipe screw thread unloads not thread gluing substantially on three times |
| TP95S | 959.1/1124.3 | 11420/9010 | 10468/6148 | 1070 | The steel pipe screw thread unloads not thread gluing through three times on repeatedly |
Annotate: on show the every individual data of each column be φ 177.8 * 10.36mm steel pipe standard and trial value, then "/" left of every two data is φ 177.8 * 10.36mm, right-hand is the standard and the trial value of φ 244.5 * 11.05mm steel pipe.
With the API standard value with representing the Japanese like product performance comparison of the most advanced level in the world:
The performance of table 8 steel pipe of the present invention and API standard and Japanese similar steel pipe contrast table
Annotate: steel pipe of the present invention and NKK performance are mean value.Steel pipe of the present invention is according to the requirement of NACETM0175-92 standard, test with NACE TM 0177-96 A method, the result shows that this steel pipe has good anti-H 2 S stress corrosion performance, and its anti-H 2 S stress corrosion threshold value σ th has reached 90%SMYS (nominal SMYS).This index not only is better than the requirement of API SPEC 5CT standard anti-H 2 S stress corrosion threshold value σ th 85% SMYS, and surpasses the guarantee value that dispatches from the factory of the horizontal threshold value σ of Japanese like product anti-H 2 S stress corrosion th.Wherein TP55S, TP80S (S), TP90S (S), TP95S (S), the anti-sulphur steel pipe of TP100S (S) (Φ 244.5mm and Φ 177.8mm) use at the oil gas well of the middle and high hydrogen sulfide content in Sichuan, and maximum well depth down reaches 4328.06m.Result of use is suitable with Japanese like product.
Claims (2)
1, a kind of petroleum steel pipe of anti-H 2 S stress corrosion, the chemical ingredients of this steel pipe % by weight are: C 0.25～0.32%, and Si 0.10～0.35%, Mn 0.60～1.20%, P≤0.020%, S≤0.010%, Ni≤0.25%, Cr 0.55～1.20%, Mo 0.10～0.50%, Cu≤0.30%, and Al 0.010～0.040%, V 0.10～0.15%, and all the other are Fe.
2, a kind of method of making the described steel pipe of claim 1, this method may further comprise the steps:
1. steel-making
Adopt the low high-quality steel scrap of inclusion constituent content to add sponge iron or molten iron, the utilization electric arc furnace is smelted, and by add the lime making foamed slag in molten steel, fully adsorbs harmful element P, S in the molten steel; Use eccentric bottom tapping, adopt ladle furnace refining+vacuum outgas+bag core silk to feed silk again and handle, carry out external refining; The vacuum outgas time is not less than 10 minutes, and the gas in the molten steel is fully removed, and casts circular steel billet with continuous caster at last;
2. tube rolling
In ring furnace,, use the tapping machine perforation, adopt finish rolling controlled rolling precision heating of pipe blank, rolling by the retained mandrel continuous mill, again by sizing mill or open and to subtract the accurate sizing of machine, after cooling on the cold bed, sawing, cold straightening are at last with the steel pipe process non-destructive test(ing)(NDT) and the finishing of making;
3. steel pipe is handled and processing
Above-mentioned steel pipe is heated to 800-950 ℃ in the quenching process furnace, quench, and is heated to 600-750 ℃ then in the tempering process furnace, carries out high tempering; Adopt high temperature sizing and high-temperature straightening, temperature is controlled at 500-650 ℃, and the high temperature sizing guarantees that deformation rate reaches 3%; By non-destructive test(ing)(NDT), carry out then pipe end car silk, box cupling twist connect, another pipe end car silk, production tube carries out hydrostatic test again, guard ring on two pipe ends sprays mark, paints, box cupling is done copper plating treatment, makes fished pipe at last;
4. the box cupling thread surface is handled.
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2006
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Effective date of registration: 20190627 Address after: No. 396 Jintang Highway, Dongli District, Tianjin 300301 Patentee after: Tianjin Steel Tube Manufacturing Co., Ltd. Address before: 300301 Jintang Road, Dongli District, Tianjin Patentee before: Tianjin Steel Pipe Group Co., Ltd. |