CN101921957A - Method for manufacturing high-grade anti-corrosion seamless steel tube with large diameter ranging from phi460.0 mm to 720.0mm - Google Patents
Method for manufacturing high-grade anti-corrosion seamless steel tube with large diameter ranging from phi460.0 mm to 720.0mm Download PDFInfo
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Abstract
The invention provides a method for manufacturing a high-grade anti-corrosion seamless steel tube with a large diameter ranging from phi460.0 mm to 720.0mm. The method comprises the following steps: reasonable proportioning of steel types, steelmaking, hot rolling, helical rolling and hot expansion, thermal treatment and processing technique of a steel tube, and manufacturing of the high-grade anti-corrosion seamless steel tube with a large diameter ranging from phi460.0 mm to 720.0mm. The invention has the effects of solving the adverse effect of hazardous elements such as P, S and the like on dedicated oil pipes, obtaining high-quality and low-cost round billets, controlling mechanical property and size of the steel tube by a reasonable thermal processing technology, reducing technical requirements on residual stress and obtaining qualified large-diameter line pipes in terms of surface quality and comprehensive property. The line pipe not only enjoys high strength and excellent anti-corrosion property but also fine toughness. The steel tube features fine physicochemical property and high dimensional accuracy of the tube, facilitates applications and is favor of safety of long-distance delivery pipes, thus being capable of being widely applied to acidic oil and gas fields containing hydrogen sulfide.
Description
Technical field
The present invention relates to corrosion resistant material and oil pipes field, particularly a kind of diameter is the manufacture method of Φ 460.0～720.0mm large-caliber high-steel grade anti-corrosion seamless steel tube.
Background technology
In recent years, the sustainable development of China's economic, the adjustment of energy structure, the usage quantity of Sweet natural gas increases year by year, and large quantities of construction of gas transmission line, make of the development such as wall thickening of the development trend of pipe engineering to big caliber, the conveying of high pressure rich gas, high cold-peace corrosive Service Environment, subsea pipeline.
China publication number CN1811002A, the disclosed anti-H 2 S pipe line steel of CN1351189 are the hot-rolled sheet coil.Seamless tube is the strong point field in heavy wall, high strength, middle high alloy, corrosion-resistant, small serial production, is better than Welded Steel Pipe.C content is low among the CN1811002A, does not add the V element microalloying and handles, and is not high to P, S content requirement, do 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, the manufacturing cost height, present 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 to increase the obdurability of steel alloy and improve hardening capacity and welding property, impact property is not very desirable, added multiple noble metal, the production cost height, and do not consider the excellent proportioning of corrosion resistance nature alloying element, do not possess good anti-HIC performance, the tubing of Zhi Zaoing does not possess the requirement of carrying acidic medium thus.
Heavy-caliber pipeline mostly is welded tube, and weld seam easily exists born defective to produce the HIC cracking.The large-calibre seamless pipe has remarkable advantages than welded tube in sour environment.Consider from security standpoint, in sour environment, can use as far as possible using of seamless tube, and replace welded tube.Therefore, the exploitation of large-calibre seamless pipe is quite necessary.The patent that relates to diameter and be the manufacture method of the corrosion-resistant seamless tube spool of Φ 460.0～720.0mm large-caliber high-steel grade is not appeared in the newspapers.
Summary of the invention
For solving the problem that exists in the above-mentioned technology, the purpose of this invention is to provide a kind of diameter is the manufacture method of Φ 460.0～Φ 720mm large-caliber high-steel grade anti-corrosion seamless steel tube, help solving production difficult problems such as the smelting of large-calibre seamless line pipe, rolling and thermal treatment, the transport pipe of the safe and reliable alternative welded tube of sour environment is provided, solves the etching problem in the oil gas course of conveying; Capture the anti-HIC corrosive of high strength technical barrier.
For realizing goal of the invention, the technical solution used in the present invention provides and produces diameter is the manufacture method of Φ 460～720mm large-caliber high-steel grade anti-corrosion seamless steel tube, and this method may further comprise the steps:
A. described diameter is that the steel grades weight % of Φ 460～720mm large-caliber high-steel grade anti-corrosion seamless steel tube is: C 0.06～0.14%, Si 0.15～0.30%, and Mn 1.10～1.65%, P≤0.015%, S≤0.003%, Al 0.015～0.050%, and N 0.003～0.012%, Nb0.020～0.05%, V 0.02～0.09%, Cu≤0.20%, Ni≤0.30%, CE
IIW≤ 39, CEpcm≤22, surplus is Fe and unavoidable impurities;
B. after steel-making adopts high-quality steel scrap, sponge iron, molten iron and the preparation of alloy mother liquor of the steel grades of a weldless steel tube set by step to be fused into molten steel, by abbreviated system route electric furnace, refining, vacuum oven, feed a silk processing, continuous casting and in conjunction with microalloying, Clean Steel smelt, inclusion modification, continuous caster is cast circular steel billet;
C. hot rolling with the cold centering of cooled continuously cast bloom after, at the rotary heating furnace internal heating, 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 provides hollow billet for heat expands technology;
D. heat expands described hollow billet at the process furnace internal heating, 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, outer diameter of steel pipes control accuracy are ± 0.75%D that the wall thickness control accuracy is ± 10%t;
E. steel pipe thermal treatment and the above-mentioned steel pipe of processing are heated to 900～980 ℃ in the quenching process furnace, quench, and water-cooled behind insulation 15～45min is heated to 510～710 ℃ then in the tempering process furnace, carry out tempering; Adopt 500～630 ℃ of high temperature sizings and hot straightening, straight degree is whole less than 0.15%L, and 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 of steel pipe sprays mark, japanning.
According to the different wall of body, add and improve hardening capacity alloy Cr, Mo, Cr≤0.50%, Mo≤0.30% among the described step a.
Adopt the RH vacuum outgas among the described step b, feed silk and inclusion modification, CaSi silk feed quantity 〉=100m/ stove.
The rolling accuracy of hollow billet among the described step c, outside diameter control precision ± 0.75%D, wall thickness control accuracy ± 12.5%t.
Among the described step e, be through the mechanical performance index of heat treated steel pipe:
Yield strength: 415～635MPa
Tensile strength: 520～760MPa
Yield tensile ratio :≤0.93
Unit elongation: 〉=20%
Ballistic work: 0 ℃ of horizontal full-scale Charpy-V impact power 〉=200J
Hardness :≤248HV10
Metallographic: the F+B of duplex structure
Return, 8.0 grades of grain fineness numbers and more than.
Providing the described manufacture method of a kind of employing claim 1 to produce diameter is the corrosion-resistant seamless tube spool of Φ 460～720.0mm large-caliber high-steel grade.
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 silico-calcium silk inclusion balling to handle, and reduces the disadvantageous effect of sulfide from the source, and short process cost is lower; 2) Φ 460PQF milling train group provides hollow billet, and Φ 720 oblique millings heat expands the tandem rolling unit and obtains the high-quality body of different size in conjunction with high-end controlling hot rolling technology, and it is reasonable that perforation and rolling technology are formulated, and improved the mechanical property of line pipe to greatest extent; 3) hardening and tempering process guarantees tube body performance, selects reasonable hot straightening temperature, has reduced the unrelieved stress of line pipe to greatest extent; 4) the heavy caliber processing units guarantees pipe end groove quality and precision.Line pipe mechanical performance index of the present invention requires to be higher than the API standard.
Description of drawings
Fig. 1 is the tough linearity curve of X65QS grade of steel line pipe of the present invention;
Fig. 2 is the metallographic structure of X65QS grade of steel line pipe of the present invention.
Embodiment
Reaching embodiment in conjunction with the accompanying drawings is that the manufacture method of Φ 460.0～720.0mm large-caliber high-steel grade anti-corrosion seamless steel tube is illustrated to diameter of the present invention.
Diameter of the present invention is the manufacture method of Φ 460～720mm large-caliber high-steel grade anti-corrosion seamless steel tube, and this method may further comprise the steps:
A. described diameter is that the steel grades weight % of Φ 460～720mm large-caliber high-steel grade anti-corrosion seamless steel tube is: C 0.06～0.14%, Si 0.15～0.30%, and Mn 1.10～1.65%, P≤0.015%, S≤0.003%, Al 0.015～0.050%, and N 0.003～0.012%, Nb0.020～0.05%, V 0.02～0.09%, Cu≤0.20%, Ni≤0.30%, CE
IIW≤ 39, CEpcm≤22, surplus is Fe and unavoidable impurities;
B. after steel-making adopts high-quality steel scrap, sponge iron, molten iron and the preparation of alloy mother liquor of the steel grades of a weldless steel tube set by step to be fused into molten steel, by abbreviated system route electric furnace, refining, vacuum oven, feed a silk processing, continuous casting and in conjunction with microalloying, Clean Steel smelt, inclusion modification, continuous caster is cast circular steel billet;
C. hot rolling with the cold centering of cooled continuously cast bloom after, at the rotary heating furnace internal heating, 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 provides hollow billet for heat expands technology;
D. heat expands described hollow billet at the process furnace internal heating, 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, outer diameter of steel pipes control accuracy are ± 0.75%D that the wall thickness control accuracy is ± 10%t;
E. steel pipe thermal treatment and the above-mentioned steel pipe of processing are heated to 900～980 ℃ in the quenching process furnace, quench, and water-cooled behind insulation 15～45min is heated to 510～710 ℃ then in the tempering process furnace, carry out tempering; Adopt 500～630 ℃ of high temperature sizings and hot straightening, straight degree is whole less than 0.15%L, and 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 of steel pipe sprays mark, japanning.
According to the different wall of body, add and improve hardening capacity alloy Cr, Mo, Cr≤0.50%, Mo≤0.30% among the described step a.The rolling accuracy of hollow billet among the described step c, outside diameter control precision ± 0.75%D, wall thickness control accuracy ± 12.5%t.
Adopt the RH vacuum outgas among the described step b, feed silk and inclusion modification, CaSi silk feed quantity 〉=100m/ stove.
Among the described step e, be through the mechanical performance index of heat treated steel pipe:
Yield strength: 415～635MPa
Tensile strength: 520～760MPa
Yield tensile ratio :≤0.93
Unit elongation: 〉=20%
Ballistic work: 0 ℃ of horizontal full-scale Charpy-V impact power 〉=200J
Hardness :≤248HV10
Metallographic: the F+B of duplex structure
Return, 8.0 grades of grain fineness numbers and more than.
Producing diameter by above-mentioned manufacture method is the corrosion-resistant seamless tube spool of Φ 460～720.0mm large-caliber high-steel grade.
Diameter of the present invention is that the manufacture method of Φ 460～720mm large-caliber high-steel grade anti-corrosion seamless steel tube realizes by following steps:
1, steel-making
After adopting high-quality steel scrap, sponge iron, molten iron and the preparation of alloy mother liquor to be fused into molten steel, by abbreviated system route electric furnace, refining, vacuum oven, feed a silk processing, continuous casting and in conjunction with microalloying, Clean Steel smelt, inclusion modification, continuous caster is cast circular steel billet;
The steel grades weight % of configuration is: C 0.06～0.14%, Si0.15～0.30%, Mn 1.10～1.65%, P≤0.015%, S≤0.003%, Cu≤0.20%, Ni≤0.30%, Al 0.015～0.050%, N 0.003～0.012%, Nb 0.020～0.05%, and V 0.02～0.09%, CE
IIW≤ 39, CEpcm≤22.Surplus is the ratio that Fe and unavoidable impurities have suitably increased molten iron, guarantees high purity steel.According to the different wall of body, suitably add and improve hardening capacity alloy Cr, Mo, Cr≤0.50%, Mo≤0.50%.
Foamy slag is smelted, and the Ar gas mixing is mixed, and the submerged arc heating has good deoxidation, sweetening effectiveness, reduces inclusion.Reasonably first basicity of slag, activity of lime 〉=300ml below the condition of high vacuum degree 66.7Pa, keeps more than the 5min.Inclusion modification is handled by calcium, and CaSi feed quantity 〉=100m/ stove stirs time 〉=5min a little less than hello the silk back.Continuous casting (CCM) adopts the protection steel pipe that has the Ar hermetic seal; middle covering agent; the protection 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, at the rotary heating furnace internal heating, 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 provides hollow billet for heat expands technology;
3, heat expands hollow billet at the process furnace internal heating, 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 ℃, 4 groups of cold roll cool sizings, outside diameter control precision are ± 0.75%, and the wall thickness control accuracy is ± 10%.
4, steel pipe thermal treatment and processing
Above-mentioned steel pipe is heated to 900～980 ℃ in the quenching process furnace, quench, and water-cooled behind insulation 15～45min is heated to 510～710 ℃ then in the tempering process furnace, carry out tempering; Adopt 500～630 ℃ of high temperature sizings and hot straightening, straight degree is whole less than 0.15%L, and 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 sprays mark, japanning
Heat-treatment production line carries out the performance of modifier treatment with the keeping spool by accurate control quenching furnance and furnace temperature to steel pipe, 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.By inside and outside the Zhi Jinhang, horizontal vertical L2 rank UT (Ultrasonic Testing).By a water test, the test hydrostaticpressure is 90% of a minimum nominal yield strength, dwell time 〉=10s.
Present method is had the line pipe of highly corrosion resistant performance again for high strength promptly arranges, and adopts ultralow P, S content in the composition design, is beneficial to corrosion resistance; According to the different wall of body, suitably add and improve hardening capacity alloy Cr, Mo, Cr≤0.50%, Mo≤0.50% simultaneously.In order to obtain having the microtexture of less segregation, improve Nb content and cooperate low carbon content, obtain the NbC particle, the refinement microtexture improves the recrystallize final temperature, reduces microstructure segregation, has not only guaranteed high strength and toughness but also has guaranteed anti-HIC performance.The chemical ingredients 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: 415～635MPa
Tensile strength: 520～760MPa
Yield tensile ratio :≤0.93
Unit elongation: 〉=20%
Ballistic work: horizontal full-scale Charpy-V impact power 〉=200J.As shown in Figure 1.
Hardness :≤248HV10
Metallographic: the F+B of duplex structure returns, 8.0 grades of grain fineness numbers and more than.As shown in Figure 2.
Anti-HIC performance:
Press NACE TM0284-2003 standard, under A solution and B solution trial condition, soak 96 hours test samples respectively, crackle does not all appear, all satisfy crack length rate≤15%, crack thickness rate≤5, the requirement of the responsive rate of crackle≤2% standard, have excellent anti-HIC performance, satisfy under the acidic conditions corrosion resistance nature requirement fully transfer lime.
Chemical ingredients explanation to the preparation steel grades:
C: be strengthening element most economical, the most basic in the steel, take all factors into consideration intensity and flexible influence and the cost of carbon content, C content is controlled between 0.06～0.14% to steel.As the C content among the embodiment in the table 1.
Si:Si is the necessary element of deoxidation, also can improve the intensity of steel, can reduce toughness and solidity to corrosion but add a large amount of silicon, so its content is placed restrictions in 0.15～0.30% scope.As the Si content among the embodiment in the table 1.
Mn:Mn is necessary strengthening element, Mn add what to mate with C, guarantee the performance of body, easily to produce segregation unfavorable to corrosion resistance because of Mn.So its content is placed restrictions in 1.10～1.65% scopes.As the Mn content among the embodiment in the table 1.
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 corrosion resistance, preferably stipulate P≤0.015%, S≤0.003%.
Al:Al be killed steel the element that must add, crystal grain thinning, but during its too high levels, easily cause inclusion to increase produces hairline, reduces toughness and processing characteristics, therefore its content is placed restrictions in Al 0.015～0.050% scope.
Nb:Nb is the micro alloying element that adds, and is fairly obvious to the effect of grain fineness number refinement.The amount of Nb adds too high, is prone to rolling shortcoming in the operation of rolling, influences the surface quality of steel.Between control Nb0.025～0.050%.As the Nb content among the embodiment in the table 1.
V:V has higher precipitation strength effect and grain refining effect, and when Nb, the compound use of V microalloy element, V is together by improve the intensity of steel in the ferrite with the VC precipitation strength.Between control V0.02～0.09%.As the V content among the embodiment in the table 1.
The N:N element is an elemental gas in the steel, and it is influential that General N content surpasses 0.12% pair of corrosion resistance, controls its content in effective 0.003～0.012% scope.
Cu, Ni: be residual element in the steel grade, impact toughness and corrosion resistance are favourable, but consider the contribution of cost and carbon equivalent, and its content is controlled in Cu≤0.20%, Ni≤0.30% scope.
Cr, Mo: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 Cr, Mo, Cr≤0.50%, Mo≤0.30%.Content as the Cr among the embodiment in the table 1, Mo element.
The steel pipe composition characteristic is that low-carbon (LC) Nb is an alloy, according to the different wall of body, suitably adds and improves hardening capacity alloy Cr, Mo, Cr≤0.50%, Mo≤0.30%.Trace element Nb, V alloyization, the content of restriction Cu, Ni and impurity element P, S, and regulation C content and N content by a large amount of test and Selection reasonable component proportionings, are given high purity steel with good comprehensive corrosion resistance nature.
Obtain the circle base by above-mentioned large-caliber high-steel grade anti-corrosion seamless steel tube ingredients listed by short course steelmaking technology smelting, the geometrical dimension that the process hot rolling obtains stipulating, obtain claim 2,3 described seamless tube spools through modified thermal treatment, with the X65QS grade of steel, specification Φ 508 * 26.19mm is an example, its chemical ingredients such as following table 1.Mechanical property such as following table 2.Anti-HIC performance sees Table 3.
The tubing chemical ingredients satisfies the requirement of claim 1 fully, S and P content are lower, satisfied the composition designing requirement, and from statistical distribution as a result table 1 each stove component content deviation is very little as can be seen, carry out temperature control when stable component content helps thermal treatment, thereby have favorable tissue and performance provides precondition for tubing.As can be seen from Table 2, the present invention can satisfy X60QS line pipe performance requriements well, and yield tensile ratio is very little, has very high toughness, very low hardness value, thus guarantee to have very high corrosion resistance.From anti-HIC test-results table 3, no matter in the solution of acidic solution and synthetic seawater, all have very strong anti-HIC performance, all do not find hydrogen induced cracking (HIC) crackle and hydrogen blistering, having obvious characteristics is to have good anti-HIC performance under yield strength 〉=415MPa, the responsive rate (CSR)≤2% of crackle, crack length rate≤10%, crack thickness rate (CTR)≤3%.
The embodiment chemical ingredients of table 1 line pipe of the present invention
| Sequence number | C? | Si? | Mn? | P? | S? | Ni? | Cr? | Mo? | Cu? | Al? | V? | Nb? | CE? |
| 1? | 0.09? | 0.28? | 1.22? | 0.007? | 0.001? | 0.0 4? | 0.16? | 0.22? | 0.11? | 0.031? | 0.06? | 0.03? | 0.19? |
| 2? | 0.08? | 0.29? | 1.26? | 0.008? | 0.001? | 0.0 4? | 0.16? | 0.22? | 0.1? | 0.034? | 0.07? | 0.03? | 0.18? |
| 3? | 0.07? | 0.29? | 1.28? | 0.008? | 0.001? | 0.0 3? | 0.22? | 0.22? | 0.06? | 0.032? | 0.08? | 0.03? | 0.18? |
| 4? | 0.11? | 0.27? | 1.15? | 0.006? | 0.001? | 0.0 3? | 0.10? | 0.10? | 0.05? | 0.030? | 0.06? | 0.03? | 0.19? |
| 5? | 0.10? | 0.28? | 1.17? | 0.007? | 0.001? | 0.0 4? | 0.16? | 0.21? | 0.11? | 0.031? | 0.06? | 0.03? | 0.20? |
| 6? | 0.13? | 0.27? | 1.12? | 0.007? | 0.001? | 0.0 4? | 0.16? | 0.08? | 0.06? | 0.03? | 0.06? | 0.03? | 0.38? |
Annotate: when C content≤0.12%, carbon equivalent ce
PcmC+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B, B≤0.0005%, B content is 0 in the formula.
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
Claims (6)
1. manufacture method that diameter is Φ 460～720mm large-caliber high-steel grade anti-corrosion seamless steel tube, this method may further comprise the steps:
A. described diameter is that the steel grades weight % of Φ 460～720mm large-caliber high-steel grade anti-corrosion seamless steel tube is: C 0.06～0.14%, Si 0.15～0.30%, and Mn 1.10～1.65%, P≤0.015%, S≤0.003%, Al 0.015～0.050%, and N 0.003～0.012%, Nb0.020～0.05%, V 0.02～0.09%, Cu≤0.20%, Ni≤0.30%, CE
IIW≤ 39, CEpcm≤22, surplus is Fe and unavoidable impurities;
B. after steel-making adopts high-quality steel scrap, sponge iron, molten iron and the preparation of alloy mother liquor of the steel grades of a weldless steel tube set by step to be fused into molten steel, by abbreviated system route electric furnace, refining, vacuum oven, feed a silk processing, continuous casting and in conjunction with microalloying, Clean Steel smelt, inclusion modification, continuous caster is cast circular steel billet;
C. hot rolling with the cold centering of cooled continuously cast bloom after, at the rotary heating furnace internal heating, 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 provides hollow billet for heat expands technology;
D. heat expands described hollow billet at the process furnace internal heating, 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, outer diameter of steel pipes control accuracy are ± 0.75%D that the wall thickness control accuracy is ± 10%t;
E. steel pipe thermal treatment and the above-mentioned steel pipe of processing are heated to 900～980 ℃ in the quenching process furnace, quench, and water-cooled behind insulation 15～45min is heated to 510～710 ℃ then in the tempering process furnace, carry out tempering; Adopt 500～630 ℃ of high temperature sizings and hot straightening, straight degree is whole less than 0.15%L, and 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 of steel pipe sprays mark, japanning.
2. according to the described manufacture method of claim 1, it is characterized in that: according to the different wall of body, add and improve hardening capacity alloy Cr, Mo, Cr≤0.50%, Mo≤0.30% among the described step a.
3. according to the described manufacture method of claim 1, it is characterized in that: adopt the RH vacuum outgas among the described step b, feed silk and inclusion modification, CaSi silk feed quantity 〉=100m/ stove.
4. according to the described manufacture method of claim 1, it is characterized in that: the rolling accuracy of hollow billet among the described step c, outside diameter control precision ± 0.75%D, wall thickness control accuracy ± 12.5%t.
5. according to the described manufacture method of claim 1, it is characterized in that: among the described step e, be through the mechanical performance index of heat treated steel pipe:
Yield strength: 415～635MPa
Tensile strength: 520～760MPa
Yield tensile ratio :≤0.93
Unit elongation: 〉=20%
Ballistic work: horizontal full-scale Charpy-V impact power 〉=200J
Hardness :≤248HV10
Metallographic: the F+B of duplex structure
Return, 8.0 grades of grain fineness numbers and more than.
6. the described manufacture method production of employing claim 1 diameter is the corrosion-resistant seamless tube spool of Φ 460～720.0mm large-caliber high-steel grade.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103484782A (en) * | 2013-09-16 | 2014-01-01 | 天津钢管集团股份有限公司 | Method for manufacturing large-aperture high-strength gathering and transportation seamless steel tube for environment with high content of hydrogen sulfide |
| CN105234200A (en) * | 2015-11-19 | 2016-01-13 | 扬州诚德钢管有限公司 | On-line tube-expanding production process of large-diameter seamless steel tubes |
| CN106086654A (en) * | 2016-08-15 | 2016-11-09 | 攀钢集团成都钢钒有限公司 | Drilling machine drilling rod seamless steel pipe and manufacture method thereof |
| CN106811700A (en) * | 2015-12-02 | 2017-06-09 | 鞍钢股份有限公司 | Thick acid-resistant X60MS hot-rolled coil and manufacturing method thereof |
| CN107214480A (en) * | 2017-07-20 | 2017-09-29 | 繁昌县华特机械制造有限公司 | A kind of manufacture method of large-caliber stainless steel seamless pipe |
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| CN114425682A (en) * | 2021-12-08 | 2022-05-03 | 江苏新长江无缝钢管制造有限公司 | Manufacturing method of seamless steel pipe for smoke pipe |
| CN115354240A (en) * | 2022-08-24 | 2022-11-18 | 山东钢铁集团日照有限公司 | Economical seawater erosion resistant steel plate and manufacturing method thereof |
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| CN103484782A (en) * | 2013-09-16 | 2014-01-01 | 天津钢管集团股份有限公司 | Method for manufacturing large-aperture high-strength gathering and transportation seamless steel tube for environment with high content of hydrogen sulfide |
| CN105234200A (en) * | 2015-11-19 | 2016-01-13 | 扬州诚德钢管有限公司 | On-line tube-expanding production process of large-diameter seamless steel tubes |
| CN106811700A (en) * | 2015-12-02 | 2017-06-09 | 鞍钢股份有限公司 | Thick acid-resistant X60MS hot-rolled coil and manufacturing method thereof |
| CN106811700B (en) * | 2015-12-02 | 2018-04-24 | 鞍钢股份有限公司 | Thick acid-resistant X60MS hot-rolled coil and manufacturing method thereof |
| CN106086654A (en) * | 2016-08-15 | 2016-11-09 | 攀钢集团成都钢钒有限公司 | Drilling machine drilling rod seamless steel pipe and manufacture method thereof |
| CN107217201A (en) * | 2017-06-27 | 2017-09-29 | 包头钢铁（集团）有限责任公司 | A kind of marine drilling platform containing rare earth spud leg 600MPa seamless steel pipes and its production method |
| CN107214480A (en) * | 2017-07-20 | 2017-09-29 | 繁昌县华特机械制造有限公司 | A kind of manufacture method of large-caliber stainless steel seamless pipe |
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| CN111014304A (en) * | 2019-12-30 | 2020-04-17 | 太原重工股份有限公司 | Steel pipe hot rolling rotary expanding production equipment and method |
| 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 |
| CN113637890A (en) * | 2020-04-27 | 2021-11-12 | 宝山钢铁股份有限公司 | Ultra-fine grain seamless steel pipe and manufacturing method thereof |
| CN111979382A (en) * | 2020-09-03 | 2020-11-24 | 衡阳华菱钢管有限公司 | Large-caliber thin-wall seamless steel pipe and preparation method thereof |
| CN111979382B (en) * | 2020-09-03 | 2021-12-10 | 衡阳华菱钢管有限公司 | Large-caliber thin-wall seamless steel pipe and preparation method thereof |
| CN114425682A (en) * | 2021-12-08 | 2022-05-03 | 江苏新长江无缝钢管制造有限公司 | Manufacturing method of seamless steel pipe for smoke pipe |
| CN114425682B (en) * | 2021-12-08 | 2024-01-30 | 江苏新长江无缝钢管制造有限公司 | Manufacturing method of seamless steel tube for smoke tube |
| CN115354240A (en) * | 2022-08-24 | 2022-11-18 | 山东钢铁集团日照有限公司 | Economical seawater erosion resistant steel plate and manufacturing method thereof |
| CN115354240B (en) * | 2022-08-24 | 2022-12-27 | 山东钢铁集团日照有限公司 | Economical seawater erosion resistant steel plate and manufacturing method thereof |
| CN115558861A (en) * | 2022-10-18 | 2023-01-03 | 包头钢铁（集团）有限责任公司 | Economical X70Q thick-wall seamless steel tube manufacturing method |
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Application publication date: 20101222 |