CN103484782A - Method for manufacturing large-aperture high-strength gathering and transportation seamless steel tube for environment with high content of hydrogen sulfide - Google Patents
Method for manufacturing large-aperture high-strength gathering and transportation seamless steel tube for environment with high content of hydrogen sulfide Download PDFInfo
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Abstract
The invention provides a method for manufacturing a large-aperture high-strength gathering and transportation seamless steel tube for the environment with the high content of hydrogen sulfide. The method includes the steps of steel type reasonable matching, steel making, PQF continuous rolling, 720EM skew rolling spin expanding and thermal refining and machining. The method has the advantages that by the utilization of contributions of residual elements to the performance, element control is reasonably adjusted, the gathering and transportation tube suitable for the environment with the high content of hydrogen sulfide is obtained through the rolling technology of skew rolling spin expanding and the special heat treatment technology, the requirement for strength under high gathering and transportation operating pressure is met, and the requirement of an acid environment for the hydrogen sulfide corrosion resistant performance is met. The steel tube has the good physical and chemical performance, is high in size accuracy of a tube body, convenient to apply, beneficial to ensuring safety of a delivery pipeline, and can be widely applied to acid oil and gas fields with the high content of hydrogen sulfide.
Description
Technical field
The present invention relates to corrosion resistant material and oil gas transportation art, particularly the manufacture method of the defeated weldless steel tube of heavy caliber high-strength collection for a kind of high-hydrogen sulfide environment.
Background technology
The China's oil gas production increases year by year, the annual gas production more than seven-thousand-million cube of China Petrochemical Industry only, and wherein high have ,Yuan Ba gas field, general phosgene field, China Petrochemical Industry Sichuan, PetroChina Company Limited.'s Luojiazhai gas field etc. containing the H2S gas field.High sulfur-containing natural gas corrodibility is strong, and the gathering system safe and reliable operation can require very harsh to the collector and delivery pipe wood property.But consider that gathering system pipeline consumption is large, rely on Introduced From Abroad tubing fully, cost is high, the cycle is long, gathering system is robbed maintenance and smooth running has been subject to serious restriction.Collector and delivery pipe material in the high-hydrogen sulfide gas field only has two kinds, and to select one be heavy caliber welded tube and the Dalmine24 " pipe that the oblique milling expander is produced; the former weld seam easily exists born defect to produce the HIC cracking; latter's tubing easily produces the spiral ratio and is easy to inhibiter and applied; accelerated corrosion; two kinds of tubing all need import; price is high, procurement cycle is long, unstable properties, safety coefficient is generally on the low side, only higher than specified minimum yield strength 10～20MPa, very easily go wrong in process for processing and the defeated process of collection, affect production and safety.The obdurability coupling is not enough simultaneously, and good impelling strength and low temperature impact properties are not arranged.
In China publication number CN1811002A, C content is low, does not add the V element microalloy treatment, not high to P, S content requirement, does not provide new technology to solve the negative impact that P, S cause.The disclosed high tenacity anti-H 2 S of CN1351189 steel for gas delivering pipeline, P, S content requirement are very low, and manufacturing cost is high, and current suitability for industrialized production also is difficult to realize.CN01126611.2 discloses " a kind of low-carbon alloy steel and pipe ", this invention relates to a kind of low-carbon low-alloy steel and pipe, technical problem to be solved is increase the obdurability of steel alloy and improve hardening capacity and welding property, impact property is not very desirable, added multiple noble metal, production cost is high, and does not consider the excellent proportioning of corrosion resistance nature alloying element, do not possess good Properties of HIC resistance, the tubing of manufacturing does not thus possess the requirement of carrying acidic medium.Publication number CN101287853A discloses " seamless steel pipe for line pipe is its manufacture method ", mainly in thick-walled tube, realize high strength, toughness and corrosion resistance nature by a large amount of interpolation Mo elements 0.4～1.2%, be directed to line pipe as herein described and consider the welding property of material, in industry standard, regulation Mo element can not surpass 0.15%, after consulting, maximum value can not surpass 0.5%, so do not belong to same line pipe field.Publication number CN101417296A discloses " manufacture method of the corrosion-resistant seamless tube of large-caliber high-steel grade that diameter is Φ 219.0～460mm ", and this specification series adopts the PQF milling train directly to obtain final tubing, and the restriction of maximum specification scope is arranged.
In the high hydrogen sulfide environment, etching problem is the major issue that gathering line need to overcome.Be directed in the high-hydrogen sulfide environment, hydrogen sulfide corrosion resistant mainly has good anti-H 2 S performance by tubing.At high-hydrogen sulfide and CO2 environment, general drilling oil pipe used all adopts the non-corrosive metals such as duplex stainless steel, nickel-base alloy, non-corrosive metal is expensive, large because of consumption for gathering line, anti-corrosion measure commonly used is that the inhibiter that adopts the hydrogen sulfide corrosion resistant pipeline to add carbon dioxide corrosion-resistant reaches the rot-resistant requirement.
Summary of the invention
For solving the problem existed in above-mentioned technology, the purpose of this invention is to provide the manufacture method of a kind of high-hydrogen sulfide environment with the seamless collector and delivery pipe of large-caliber high-steel grade, be conducive to solve the production difficult problems such as smelting, rolling and thermal treatment of large-calibre seamless collector and delivery pipe, the transport pipe of the safe and reliable alternative welded tube of high sulfur is provided, solves the etching problem in the oil gas course of conveying.
For realizing goal of the invention, the technical solution used in the present invention is the manufacture method of a kind of high-hydrogen sulfide environment with the seamless collector and delivery pipe of large-caliber high-steel grade, and the method comprises the following steps:
A. described high sulfur by the steel grades % by weight of the defeated weldless steel tube of heavy caliber high-strength collection is: C0.05～0.13%, Si0.25～0.50%, Mn1.20～1.50%, P≤0.015%, S≤0.003%, Al0.030～0.060%, N0.003～0.012%, Nb0.030～0.10%, V0.04～0.09%, Cu0.15～0.35%, Ni0.10～0.50%, Mo0.10～0.35%, Cr0.15～0.45%, Ca≤0.006%, CE
Π W≤ 0.39%, CEpcm≤0.22%, surplus is Fe and inevitable impurity;
B. steel-making is by adopting high-quality steel scrap, tube head and molten iron >=30% in the Composition Design raw material of step a weldless steel tube, after being fused into molten steel, by electric furnace, refining, RH vacuum oven, feed a silk processing, continuous casting and in conjunction with microalloying, Clean Steel smelt, inclusion modification, continuous caster is cast Φ 400mm and above section steel billet; Feed silk and be treated to pure Ca silk feed quantity >=100m/ stove;
C. hot rolling is by after the cold centering of cooled continuously cast bloom, in rotary heating furnace, heat, furnace temperature is 1230～1290 ℃, heating of pipe blank temperature deviation ± 10 ℃, 1220～1260 ℃ of hot piercing temperature, 940～1200 ℃ of Φ 460PQF tandem rolling unit tandem rolling temperature, 880～980 ℃ of sizing temperature, cooling, revolving expansion technique for oblique milling provides hollow billet;
D. oblique milling is revolved to expand described hollow billet is heated in process furnace, furnace temperature is 1120～1190 ℃, heating of pipe blank temperature deviation ± 10 ℃, thick by revolving expansion and expansion control tube body wall, protect external diameter, 680～780 ℃ of temperature controlling range by the reheating furnace temperature control, the temperature difference is ± 10 ℃, four groups of cold roll cool sizings, the outer diameter of steel pipes control accuracy is ± 0.75%D that the wall thickness control accuracy is ± 12.5%t;
E. the above-mentioned steel pipe of modifier treatment is heated to 900～980 ℃ in the stepped start-stop system high-temperature heater, carries out cold quenching after being incubated 45～80min, then in stepped start-stop system low-temperature heat stove, is heated to 600～710 ℃, carries out the tempering air cooling; Adopt 500～630 ℃ of high temperature sizings and hot straightening, directly spend integral body and be less than 0.15%L, out of roundness is less than 1%D; Through heat treated mechanical properties of pipe index, be:
Yield strength: 360～635MPa
Tensile strength: 520～760MPa
Yield tensile ratio :≤0.93
Unit elongation: >=20%
Ballistic work: horizontal full-scale Charpy-V impact power >=200J
Hardness :≤230HV10
Metallographic: the F+B of duplex structure
return, 8.0 grades of grain fineness numbers and more than
HIC performance: CSR≤2% under the high hydrogen sulfide simulated environment, CLR≤12%, CTR≤3%.
A kind of defeated weldless steel tube of heavy caliber high-strength collection for the high-hydrogen sulfide environment that adopts above-mentioned manufacture method to produce diameter >=500mm is provided.
The invention has the beneficial effects as follows: 1) adopt low-carbon high-manganese microalloying steel grade, process for making is strict with P, S content, adopts pure calcium silk inclusion balling to process, and carries out powder injection process, reduces the content of impurity S, reduces the disadvantageous effect of sulfide from source; 2) Φ 460PQF milling train group provides hollow billet, and Φ 720 oblique milling heat expand the tandem rolling unit and obtain the high-quality body of different size in conjunction with high-end controlling hot rolling technology, revolve and expand the homogeneity that technique has guaranteed wall thickness; 3) hardening and tempering process guarantees tube body performance, selects reasonable hot straightening temperature, has reduced to greatest extent the unrelieved stress that collects defeated weldless steel tube; 4) produce bore and be greater than the defeated weldless steel tube of collection that 500mm, diameter are 720mm, meet the conveying requirement of gathering line.Line pipe mechanical performance index of the present invention requires higher than the API standard.
The accompanying drawing explanation
The tough linearity curve that Fig. 1 is L360QS grade of steel line pipe of the present invention;
The metallographic structure that Fig. 2 is L360QS grade of steel line pipe of the present invention.
Embodiment
Reaching by reference to the accompanying drawings embodiment provides a kind of high-hydrogen sulfide environment to be illustrated by the manufacture method of the seamless collector and delivery pipe of large-caliber high-steel grade to of the present invention.
The manufacture method of a kind of high-hydrogen sulfide environment with the seamless collector and delivery pipe of large-caliber high-steel grade that provide of the present invention, the method comprises the following steps:
A. described high-hydrogen sulfide environment by the steel grades % by weight of the seamless collector and delivery pipe of large-caliber high-steel grade is: C0.05～0.13%, Si0.25～0.50%, Mn1.20～1.50%, P≤0.015%, S≤0.003%, Al0.030～0.060%, N0.003～0.012%, Nb0.030～0.10%, V0.04～0.09%, Cu0.15～0.35%, Ni0.10～0.50%, Mo0.10～0.35%, Cr0.15～0.45%, Ca≤0.006%, CE
Π W≤ 0.39%, CEpcm≤0.22%, surplus is Fe and inevitable impurity;
B. steel-making is by adopting high-quality steel scrap, tube head and molten iron >=30% in the Composition Design raw material of step a weldless steel tube, after being fused into molten steel, the compact type productive technology of short flow route of closely combining by electric arc furnace-continuous casting, comprise electric furnace, refining, RH vacuum oven, feed a silk processing, continuous casting and in conjunction with microalloying, Clean Steel smelt, inclusion modification, continuous caster is cast Φ 400mm and above section steel billet; Feed silk and be treated to pure Ca silk feed quantity >=100m/ stove;
C. hot rolling is by after the cold centering of cooled continuously cast bloom, in rotary heating furnace, heat, furnace temperature is 1230～1290 ℃, heating of pipe blank temperature deviation ± 10 ℃, 1220～1260 ℃ of hot piercing temperature, 940～1200 ℃ of Φ 460PQF tandem rolling unit tandem rolling temperature, 880～980 ℃ of sizing temperature, cooling, for expanding technique, heat provides hollow billet;
D. oblique milling is revolved to expand described hollow billet is heated in process furnace, furnace temperature is 1120～1190 ℃, heating of pipe blank temperature deviation ± 10 ℃, thick by revolving expansion and expansion control tube body wall, protect external diameter, 680～780 ℃ of temperature controlling range by the reheating furnace temperature control, the temperature difference is ± 10 ℃, four groups of cold roll cool sizings, the outer diameter of steel pipes control accuracy is ± 0.75%D that the wall thickness control accuracy is ± 12.5%t;
E. the above-mentioned steel pipe of modifier treatment is heated to 900～980 ℃ in the stepped start-stop system high-temperature heater, carries out cold quenching after being incubated 45～80min, then in stepped start-stop system low-temperature heat stove, is heated to 600～710 ℃, carries out the tempering air cooling; Adopt 500～630 ℃ of high temperature sizings and hot straightening, directly spend integral body and be less than 0.15%L, out of roundness is less than 1%D;
According to various outer diameter and the wall thickness of body, add and improve hardening capacity alloy Cr, Mo, Ni, Ni0.10～0.50%, Mo0.10～0.35%, Cr0.15～0.45% in described step a.
Adopt the RH vacuum outgas in described step b, feed silk and inclusion modification, pure Ca silk feed quantity >=100m/ stove.
The rolling accuracy of hollow billet in described step c, outside diameter control precision ± 0.75%D, wall thickness control accuracy ± 12.5%t.
In described step e, through the mechanical performance index of heat treated steel pipe, be:
Yield strength: 360～635MPa
Tensile strength: 520～760MPa
Yield tensile ratio :≤0.93
Unit elongation: >=20%
Ballistic work: horizontal full-scale Charpy-V impact power >=200J
Hardness :≤230HV10
Metallographic: the F+B of duplex structure
return, 8.0 grades of grain fineness numbers and more than
HIC performance: CSR≤2% under the high hydrogen sulfide simulated environment, CLR≤12%, CTR≤3%.
Produce the seamless collector and delivery pipe of large-caliber high-steel grade for the high-hydrogen sulfide environment by above-mentioned manufacture method.
A kind of high-hydrogen sulfide environment of the present invention is realized by following steps by the manufacture method of the seamless collector and delivery pipe of large-caliber high-steel grade:
1, steel-making
Adopting high-quality steel scrap, molten iron and high-quality tube head is raw material, by abbreviated system route electric furnace, LF refining, RH vacuum oven, the processing of pure Ca silk, continuous casting and in conjunction with microalloying, Clean Steel smelt, inclusion modification, continuous caster is cast the 400mm circular billet;
The steel grades % by weight of configuration is: C0.05～0.13%, Si0.25～0.50%, Mn1.20～1.50%, P≤0.015%, S≤0.003%, Al0.030～0.060%, N0.003～0.012%, Nb0.030～0.10%, V0.04～0.09%, Cu0.15～0.35%, Ni0.10～0.50%, Mo0.10～0.35%, Cr0.15～0.45%, Ca≤0.006%, CE Π W≤0.39%, CEpcm≤0.22%, surplus is Fe and inevitable impurity; Suitably increase the ratio of molten iron, guaranteed high purity steel.According to various outer diameter and the wall thickness of body, suitably add and improve hardening capacity alloy Cr, Mo, Ni, Ni0.10～0.50%, Mo0.10～0.35%, Cr0.15～0.45%.
Foamy slag is smelted, the Ar gas agitating, and the submerged arc heating, have good deoxidation, sweetening effectiveness, reduces inclusion.Reasonably first basicity of slag, activity of lime >=300ml, below condition of high vacuum degree 66.7Pa, more than keeping 5min.Inclusion modification is processed by calcium, and Ca silk feed quantity >=100m/ stove stirs time >=5min a little less than hello silk is rear.Continuous casting (CCM) adopts the protection steel pipe with the Ar hermetic seal; middle covering agent; the protective casting modern technique of submerged nozzle and crystallizer protecting residue; molten steel and air are isolated fully; prevent the secondary oxidation of molten steel in casting cycle; control two cold-zone water temperature and pulling rates, guarantee the surface quality of body.
2, hot rolling
After the cold centering of cooled continuously cast bloom, in rotary heating furnace, heat, furnace temperature is 1230～1290 ℃, heating of pipe blank temperature deviation ± 10 ℃, 1220～1260 ℃ of hot piercing temperature, 940～1200 ℃ of Φ 460PQF tandem rolling unit tandem rolling temperature, 880～980 ℃ of sizing temperature, cooling, for expanding technique, heat provides hollow billet;
The PQF milling train provides hollow billet, has guaranteed the ununiformity of hollow billet, and precision is high, and steel tube surface is more smooth, avoids the defects such as the hollow billet surface cracks, folding, absciss layer.PQF retained mandrel three-roller tandem rolling tube machine is avoided " ring " phenomenon, and except tube end, whole hollow billet inhomogeneity of wall thickness be no more than ± and 4%.Open external diameter and wall thickness accuracy that the reducing sizing mill group guarantees hollow billet.The aligning unit guarantees that the flexibility of steel pipe index is less than 1.5mm/m.
3, oblique milling is revolved to expand described hollow billet is heated in process furnace, furnace temperature is 1120～1190 ℃, heating of pipe blank temperature deviation ± 10 ℃, thick by revolving expansion and expansion control tube body wall, protect external diameter, 680～780 ℃ of temperature controlling range by the reheating furnace temperature control, the temperature difference is ± 10 ℃, four groups of cold roll cool sizings, the outer diameter of steel pipes control accuracy is ± 0.75%D that the wall thickness control accuracy is ± 12.5%t;
Mainly the comprising walking beam furnace, revolve and expand tube rolling mill, reeling mill, stepped start-stop system reheating furnace, 5 frame four roller sizing mills, chain type cooling bed, car-type heat treating furnace, gag straightener, ultrasonic reflectoscope, hydraulic tester, milling saw, plain-end chamfering machine, the gauging machine etc. of weighing of diagonal rolling expanding pipe group.
Be heated to 1130～1200 ℃ in process furnace, sent by roller-way, after high pressure water carries out the outside surface de-scaling, send into to revolve with the rotating mode of motion of spirrillum and expand tube rolling mill and carry out the expander rolling.Revolve the expansion tube rolling mill and mainly by two, turn to identical tapered roller, a taper top and a push rod along rolling centerline direction support top to form, in the operation of rolling, caliber enlarges, wall thickness reduction, and the total coefficient of elongation approaches 1.The adjustment of diagonal rolling expanding pipe relies on online software package, based on minority basic data (caliber, steel grade, temperature etc.) computer, whole rolling line is calculated to all adjustment parameters.The hollow billet of reeling mill after to oblique milling carries out the smooth of surfaces externally and internally, improves the surfaces externally and internally quality, plays the technique purpose of even hollow billet wall thickness; Four roller sizings are sizing units that the domestic first cover is applied to hot rolling line, changed the processing set-up of 120 ° of traditional three roller sizing roll cornerites, four roller sizings have reduced the roll cornerite, the gap of at the bottom of reducing roller and roll gap place flow rate of metal, make the metal inside homogeneous microstructure, reduce metal and adding the internal stress that produce man-hour.
The pipe-expanding machine used at present has drawing type pipe-expanding machine, pushing formula pipe-expanding machine and three kinds of modes of production of roll-type diagonal rolling expanding pipe.The first two pipe-expanding machine is due to the restriction that is subject to stress and deformation state, the tube surfaces fine defects enlarges, easily crack and interior straight way, external diameter, wall thickness deviation and sinuousness all will become greatly, and dimensional precision, the surface quality of producing steel pipe are good not as good as oblique milling roll-type diagonal rolling expanding pipe.The drawing type diagonal rolling expanding pipe also has that lumber recovery is low, production efficiency is low and the high shortcoming of tool expense.Producing heavy caliber seamless steel pipe by the oblique rolling extension diameter method is a kind of more novel production technique, in China, still belongs to the first.The 720REM rolling technology is to expand unit through overwinding, by the oblique milling mode, reaches the technique purpose that subtracts the wall hole enlargement.The advantage that the mode hole enlargement of employing oblique milling is compared with traditional expander technique is: with traditional expander technique, by the technique that enlarges internal diameter, destruction metal inside tissue, compare, metal inside tissue after oblique rolling extension diameter technique belongs to and rolls the state tissue, deflection reaches 40%, dense internal organization, crystal grain attenuates, and has higher mechanical property and processing characteristics.Simultaneously, the hot-expanding pipe material needs the high-quality pipe, and the precision of pipe will have influence on the geometric accuracy of final finished pipe, and the pipe source will be controlled quality preferably.Combined high precision 460PQF rolling, provide the pipe of high-quality, and 720REM revolves expansion, finally obtains the tubing of high-quality.
4, Steel Pipe Heat treatment and processing
Above-mentioned steel pipe is heated to 900～980 ℃ in quenching heating furnace, is quenched, and is incubated water-cooled after 15～45min, then is heated to 510～710 ℃ in the tempering process furnace, carries out tempering; Adopt 500～630 ℃ of high temperature sizings and hot straightening, directly spend integral body and be less than 0.15%L, out of roundness is less than 1%D; By non-destructive test(ing)(NDT), production tube carries out hydrostatic test again, processing API standard groove, and guard ring on two pipe ends, spray mark, japanning
Heat-treatment production line is by accurately controlling quenching furnance and furnace temperature, in outer pouring, the mode of spray rotation is carried out shrend, steel pipe is carried out to the performance of modifier treatment with the keeping spool, 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 controlling the low unrelieved stress of steel pipe.By inside and outside Zhi Jinhang, transverse and longitudinal L2/C rank UT (Ultrasonic Testing).By water test, the test hydrostaticpressure is minimum nominal yield strength 95%, dwell time >=10s.
Present method has high strength that the heavy caliber collector and delivery pipe of high-corrosion resistance is arranged again in order to obtain, and adopts ultralow P, S content on Composition Design, is beneficial to corrosion resistance; According to the different wall of body, suitably add and improve hardening capacity alloy Cr, Mo simultaneously, the Ni alloy, improve corrosion resistance, guaranteed mechanical property.Adopt PQF unit and the combination of EM unit in the operation of rolling, obtain high-precision body.Drench rotation mode outward by the interior spray of novelty and carry out shrend, arrive good hardening capacity and grain refining, meet the requirement of performance.The chemical composition of this steel grade and heat treating regime are finally determined through the test of many times optimized choice.
The performance of the pipeline steel tube of producing according to present method reaches following requirement:
Yield strength: 360～635MPa
Tensile strength: 520～760MPa
Yield tensile ratio :≤0.93
Unit elongation: >=20%
Ballistic work: horizontal full-scale Charpy-V impact power >=200J
Hardness :≤230HV10
Metallographic: the F+B of duplex structure
return, 8.0 grades of grain fineness numbers and more than.As shown in Figure 2.Properties of HIC resistance:
Press NACE TM0284 standard, soak 96 hours test samples under the A solution condition, crackle does not all appear, all meet crack length rate≤15%, crack thickness rate≤5%, the requirement of crack-sensitivity rate≤2% standard, there is excellent Properties of HIC resistance, meet under acidic conditions the corrosion resistance nature requirement to transfer lime fully.Carry out simulation test according to the high-hydrogen sulfide environment, the H2S dividing potential drop is 2.16MPa, the CO2 dividing potential drop is 1.2MPa, temperature is 60 ℃, carries out HIC and SSC test, HIC performance: CSR≤2% under the high hydrogen sulfide simulated environment, CLR≤12 %, the SSC fracture, do not appear in CTR≤3%, has excellent hydrogen sulfide corrosion resistance energy.
Chemical composition explanation to the preparation steel grades:
C: be strengthening element, consider impact and the cost of carbon content on intensity and the toughness of steel, and corrosion resistance, C content is controlled between 0.05～0.13%.As the C content in the embodiment in table 1.
Si:Si is the necessary element of deoxidation, improves the intensity of steel, so its content is placed restrictions in 0.25～0.50% scope.As the Si content in the embodiment in table 1.
Mn:Mn is necessary strengthening element, guarantees the performance of body, belongs to the low-carbon high-manganese design, so its content is placed restrictions in 1.20～1.50% scopes.As the Mn content in the embodiment in table 1.
P, S:P and S are the detrimental impurity elements, its content of reduce.But must consider the cost of making steel, in order to obtain better corrosion resistance, preferably stipulate P≤0.015%, S≤0.003%.
Al:Al is the element that must add crystal grain thinning, considers Al/N ratio, inclusion content, toughness and processing characteristics, therefore its content is placed restrictions in Al0.020～0.050% scope.
Nb:Nb is the micro alloying element added, fairly obvious to the effect of intensity, grain fineness number refinement.Control between Nb0.030～0.10%.As the Nb content in the embodiment in table 1.
V:V has higher precipitation strength effect and Grain Refinement Effect, and when Nb, V microalloy element compound use, V is same by improve the intensity of steel in ferrite with the VC precipitation strength.Control between V0.04～0.09%.As the V content in the embodiment in table 1.
N:N, O, H element are elemental gas in steel, consider welding property and corrosion resistance, control its content in effective 0.003～0.012% scope.
Cu: be residual element in steel grade, On Impact Toughness and corrosion resistance are favourable, but consider the contribution of cost and carbon equivalent, and its content is controlled in 0.15～0.35% scope.
Ni, Cr, Mo:Ni, Cr, Mo element can improve the hardening capacity of material, thereby guarantee the performance of heavy caliber thick wall body, according to the different wall of body, suitably add and improve hardening capacity alloy Ni0.10～0.50%, Mo0.10～0.35%, Cr0.15～0.45%.Content as the Cr in the embodiment in table 1, Mo, Ni element.
The steel pipe composition characteristic is that low-carbon high-manganese Nb is associated gold, according to the different wall of body, suitably adds and improves hardening capacity alloy Ni0.10～0.50%, Mo0.10～0.35%, Cr0.15～0.45%.Trace element Nb, V alloy, the content of restriction Cu, Ni and impurity element P, S, and regulation C content and N content, select the reasonable component proportioning by lot of experiments, gives high purity steel with good comprehensive corrosion resistance nature.
Smelt and obtain the circle base by short course steelmaking technology by above-mentioned large-caliber high-steel grade anti-corrosion seamless steel tube ingredients listed, obtain the geometrical dimension of regulation through hot rolling, obtain claim 2,3 described seamless line pipes through modified thermal treatment, with the L360QS grade of steel, specification Φ 508 * 22.2mm is example, and its chemical composition is as following table 1.Mechanical property is as following table 2.Properties of HIC resistance is in Table 3.
The tubing chemical composition meets the requirement of claim 1 fully, Cr, Mo, Ni add on a small quantity, and element S and P content are lower, and the component content deviation is very little, carry out temperature control when stable component content is conducive to thermal treatment, thereby there is good tissue and performance provides precondition for tubing.As can be seen from Table 2, the present invention can meet L360QS line pipe performance requriements well, and yield tensile ratio is very little, has very high toughness, very low hardness value, thus guaranteeing to have very high corrosion resistance, performance also can reach the requirement of X70QS simultaneously.From anti-HIC test-results table 3, there is very strong Properties of HIC resistance, all do not find hydrogen induced cracking (HIC) crackle and hydrogen blistering, having obvious feature is to have good Properties of HIC resistance under yield strength >=360MPa, crack-sensitivity rate (CSR)≤2%, crack length rate≤12%, crack thickness rate (CTR)≤3%.Carry out simulation test according to the high-hydrogen sulfide environment, the H2S dividing potential drop is 2.16MPa, the CO2 dividing potential drop is 1.2MPa, temperature is 60 ℃, carries out HIC and SSC test, HIC performance: CSR≤2% under the high hydrogen sulfide simulated environment, CLR≤12%, the SSC fracture, do not appear in CTR≤3%, has excellent hydrogen sulfide corrosion resistance energy.
The embodiment chemical composition of table 1 line pipe of the present invention
Annotate: when C content≤0.12%, carbon equivalent ce
pcm=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B, B≤0.0005%, in formula, B content is 0.
When C content>0.12% calculates carbon equivalent, carbon equivalent ce
iIW=C+Mn/6+Cu/15+Ni/15+Cr/5+Mo/5+V/5
Mechanical property and the metallographic of table 2 line pipe embodiment of the present invention
The anti-HIC test-results of table 3 line pipe embodiment of the present invention
The simulated condition test-results of table 4 line pipe embodiment of the present invention
It is on probation through Southwest Oil bight project that the present invention collects defeated weldless steel tube, completed whole installations and test in place, and service condition is good.
Claims (2)
1. the manufacture method of the defeated weldless steel tube of heavy caliber high-strength collection for a high-hydrogen sulfide environment, the method comprises the following steps:
A. described high sulfur by the steel grades % by weight of the defeated weldless steel tube of heavy caliber high-strength collection is: C0.05～0.13%, Si0.25～0.50%, Mn1.20～1.50%, P≤0.015%, S≤0.003%, Al0.030～0.060%, N0.003～0.012%, Nb0.030～0.10%, V0.04～0.09%, Cu0.15～0.35%, Ni0.10～0.50%, Mo0.10～0.35%, Cr0.15～0.45%, Ca≤0.006%, CE
Π W≤ 0.39%, CEpcm≤0.22%, surplus is Fe and inevitable impurity;
B. steel-making is by adopting high-quality steel scrap, tube head and molten iron >=30% in the Composition Design raw material of step a weldless steel tube, after being fused into molten steel, by electric furnace, refining, RH vacuum oven, feed a silk processing, continuous casting and in conjunction with microalloying, Clean Steel smelt, inclusion modification, continuous caster is cast Φ 400mm and above section steel billet; Feed silk and be treated to pure Ca silk feed quantity >=100m/ stove;
C. hot rolling is by after the cold centering of cooled continuously cast bloom, in rotary heating furnace, heat, furnace temperature is 1230～1290 ℃, heating of pipe blank temperature deviation ± 10 ℃, 1220～1260 ℃ of hot piercing temperature, 940～1200 ℃ of Φ 460PQF tandem rolling unit tandem rolling temperature, 880～980 ℃ of sizing temperature, cooling, revolving expansion technique for oblique milling provides hollow billet;
D. oblique milling is revolved to expand described hollow billet is heated in process furnace, furnace temperature is 1120～1190 ℃, heating of pipe blank temperature deviation ± 10 ℃, thick by revolving expansion and expansion control tube body wall, protect external diameter, 680～780 ℃ of temperature controlling range by the reheating furnace temperature control, the temperature difference is ± 10 ℃, four groups of cold roll cool sizings, the outer diameter of steel pipes control accuracy is ± 0.75%D that the wall thickness control accuracy is ± 12.5%t;
E. the above-mentioned steel pipe of modifier treatment is heated to 900～980 ℃ in the stepped start-stop system high-temperature heater, carries out cold quenching after being incubated 45～80min, then in stepped start-stop system low-temperature heat stove, is heated to 600～710 ℃, carries out the tempering air cooling; Adopt 500～630 ℃ of high temperature sizings and hot straightening, directly spend integral body and be less than 0.15%L, out of roundness is less than 1%D; Through heat treated mechanical properties of pipe index, be:
Yield strength: 360～635MPa
Tensile strength: 520～760MPa
Yield tensile ratio :≤0.93
Unit elongation: >=20%
Ballistic work: horizontal full-scale Charpy-V impact power >=200J
Hardness :≤230HV10
Metallographic: the F+B of duplex structure
return, 8.0 grades of grain fineness numbers and more than.
HIC performance: CSR≤2% under the high hydrogen sulfide simulated environment, CLR≤12%, CTR≤3%.
2. the defeated weldless steel tube of heavy caliber high-strength collection for the high-hydrogen sulfide environment that adopts manufacture method claimed in claim 1 to produce diameter >=500mm.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101417296A (en) * | 2008-12-04 | 2009-04-29 | 天津钢管集团股份有限公司 | Manufacture method of large caliber high steel grade corrosion proof seamless steel tube in diameter phi 219.0-460.0mm |
| CN101892432A (en) * | 2010-07-09 | 2010-11-24 | 天津钢管集团股份有限公司 | Manufacturing method of X70QS seamless line pipe for acid environment |
| CN101921957A (en) * | 2010-07-09 | 2010-12-22 | 天津钢管集团股份有限公司 | Method for manufacturing high-grade anti-corrosion seamless steel tube with large diameter ranging from phi460.0 mm to 720.0mm |
-
2013
- 2013-09-16 CN CN201310422486.3A patent/CN103484782A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101417296A (en) * | 2008-12-04 | 2009-04-29 | 天津钢管集团股份有限公司 | Manufacture method of large caliber high steel grade corrosion proof seamless steel tube in diameter phi 219.0-460.0mm |
| CN101892432A (en) * | 2010-07-09 | 2010-11-24 | 天津钢管集团股份有限公司 | Manufacturing method of X70QS seamless line pipe for acid environment |
| CN101921957A (en) * | 2010-07-09 | 2010-12-22 | 天津钢管集团股份有限公司 | Method for manufacturing high-grade anti-corrosion seamless steel tube with large diameter ranging from phi460.0 mm to 720.0mm |
Cited By (9)
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|---|---|---|---|---|
| CN108942103A (en) * | 2018-08-01 | 2018-12-07 | 河北华通线缆集团股份有限公司 | A kind of manufacturing method of Nickel-Based Steel coiled tubing |
| CN108942103B (en) * | 2018-08-01 | 2020-05-12 | 河北华通线缆集团股份有限公司 | Manufacturing method of nickel-based alloy steel coiled tubing |
| CN109576478A (en) * | 2018-12-18 | 2019-04-05 | 沧州隆泰迪管道科技有限公司 | A kind of pipe fitting heat treatment method |
| CN109366111A (en) * | 2018-12-29 | 2019-02-22 | 无锡苏嘉法斯特汽车零配件有限公司 | A kind of manufacturing method of CP800 torsion beam welded tube |
| CN110029263A (en) * | 2019-04-22 | 2019-07-19 | 南京钢铁股份有限公司 | The process of sulfur-bearing Aluminum steel production |
| CN110029263B (en) * | 2019-04-22 | 2021-03-12 | 南京钢铁股份有限公司 | Process for producing sulfur-containing and aluminum-containing steel |
| CN110408862A (en) * | 2019-08-19 | 2019-11-05 | 衡阳华菱钢管有限公司 | Seamless steel pipe, manufacturing method and its application |
| CN111118410A (en) * | 2020-01-16 | 2020-05-08 | 天津钢管制造有限公司 | Thick-wall large-caliber high-steel grade pipeline pipe with thickness of 40-60 mm and manufacturing method thereof |
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