CN105543705A - Manufacturing method for large-strain-resistant corrosion-resistant seamless line pipe for marine environment R-Lay laying - Google Patents
Manufacturing method for large-strain-resistant corrosion-resistant seamless line pipe for marine environment R-Lay laying Download PDFInfo
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Abstract
The invention relates to a manufacturing method for a large-strain-resistant corrosion-resistant seamless line pipe for marine environment R-Lay laying. The method is used for manufacturing the line pipe which is suitable for shallow sea and deep sea reelpipe manner laying and can meet the requirement that the corrosion-resistant high strength is larger than or equal to 415 MPa in an acid environment after repeated twining and straightening are carried out. The method includes the steps of burdening and pipe manufacturing, and a pipe material meeting the requirement for conveying exploited oil and gas resources in the shallow sea and deep sea R-Lay laying manner is manufactured. The manufacturing method has the beneficial effects that the seamless line pipe has the good large-strain-resistant performance, it is guaranteed that the strength is larger than 415 MPa after tension-compression cycling is carried out three times under 3% strain, and the -20 DEG C ballistic work is larger than 300 J. The good HIC and SSC resistance is achieved, the CSR is smaller than or equal to 1.5%, the crack length rate is smaller than or equal to 5%, the CTR is smaller than or equal to 3%, and breakage can be avoided when 100% loading is carried out for 96 hours in the SSCB method. The large-strain-resistant corrosion-resistant seamless line pipe is widely suitable for the shallow sea and deep sea R-Lay laying manner.
Description
Technical field
The present invention relates to oceanic resources exploitation and oil-gas transportation field, the manufacture method of Chinese People's Anti-Japanese Military and Political College's strain hydrogen sulfide corrosion resistant high-strength seamless steel pipe that particularly ocean environment R-lay paving mode is used.
Background technology
Along with the reduction of transport line cost, high strength gross distortion pipeline is in the demand of the environment such as Landslide Deformation, deep-sea R-Lay laying of passing through discontinuous frozen soil layer, height rises and falls.R-Lay (Reel-Lay, pipe crimping is laid) is one of deep water, the main paving mode of ultra-deep-water pipe laying at first, and in recent years because its laying efficiency is high, the shallow sea be also applicable to based on stress design is laid.Have two critical strain limit based on stress design, one is the tension strain limit: another is the compressive strain limit.For the tension strain limit, need excellent impelling strength, tubing has certain crack arrest characteristic.For the critical strain limit, need a critical strain preventing pipeline flexing when pipeline is subject to bending, need tubing to have low yield tensile ratio and good uniform elongation.Therefore having the high tension strain limit and high compression strain limit is be badly in need of the technical requirements that will reach based on stress design tubing.
CN101914723A discloses a kind of hot-rolling large-deformation-resistance pipeline steel and preparation method thereof, and this invention is hot-rolled coil.CN102534377A X70 level large-deformation resistance pipe line steel plate disclosing a kind of good-toughness and preparation method thereof, belongs to hot-rolled steel sheet, technical field of low-carbon micro-alloy steel, not mentioned corrosion resistance.CN102465235A, CN101962733A, CN102676952A, CN102080194A, CN101864535A, CN104250713A etc. are pipe line steel field.415SPDF to use in sour environment in Chinese People's Anti-Japanese Military and Political College's strain and excellent toughness use most Hi-grade steel as reality.High strength (>=415MPa) Chinese People's Anti-Japanese Military and Political College's strain property also has no report by the 3% tension and compression seamless line pipe tested for 3 times that circulates.
Summary of the invention
For solving Problems existing in above-mentioned technology, the object of this invention is to provide a kind of ocean environment R-Lay and lay the manufacture method straining anticorrosive seamless line pipe with the Chinese People's Anti-Japanese Military and Political College, to meet the line pipe of the Chinese People's Anti-Japanese Military and Political College's strain property required for the severe rugged environment exploitations such as deep-sea, solve line pipe when Reusability, intensity sharply declines and can not meet design requirement.
For realizing goal of the invention, the technical solution used in the present invention is to provide a kind of ocean environment R-Lay and lays the manufacture method straining anticorrosive high intensity seamless line pipe with the Chinese People's Anti-Japanese Military and Political College, the method manufacture is applicable to shallow sea, deep-sea pipe crimping mode is laid there is repeatedly winding-stretching circulation after still can meet the line pipe of sour environment with anticorrosive high strength >=415MPa, the method comprises the following steps:
A. the described ocean environment R-Lay that the prepares burden laying Ingredients Weight % that the Chinese People's Anti-Japanese Military and Political College strains anticorrosive seamless line pipe is: C0.05 ~ 0.13%, Si0.20 ~ 0.40%, Mn1.0 ~ 1.40%, P≤0.010%, S≤0.002%, Ni0.05 ~ 0.30%, Cr0.05 ~ 0.30%, Mo0.05 ~ 0.15%, Als0.010 ~ 0.050%, N≤0.010%, Nb0.010 ~ 0.050%, V0.03 ~ 0.08%, Cu0.05 ~ 0.25%, Ti0.008 ~ 0.030%, Ca0.0005 ~ 0.0040%, Pb≤0.020%, Sn≤0.020%, As≤0.030%, Sb≤0.015%, Bi≤0.015%, B≤0.0005%, surplus is Fe and impurity, carbon equivalent ce pcm≤0.22%, CE II W≤0.39%.Ni+Mo+Cr+Cu≤0.8％；Pb+Sn+As+Sb+Bi≤0.030％；
B. the production process that ocean environment R-Lay described in tubulation lays with the Chinese People's Anti-Japanese Military and Political College strains anticorrosive seamless line pipe comprises: steel-making, two roller MPM or three rod PQF Continuous mill train continuous mill oblique millings, modifier treatment, secondary Calcium treatment is adopted to reduce Impurity S con-tent, Trace Titanium Treatment improves blank hot plasticity and ensures cc billet surface quality, and end induction stirring reduces component segregation; Adopt two roller MPM or three rod PQF Continuous mill train tandem rollings to obtain the specification series of 60.3mm ~ 508mm, then roll state pipe in conjunction with 720REM unit production 508 ~ 711mm specification series; Roll after cooling state pipe after the heating of stepped start-stop system high temperature 910 ~ 980 DEG C of process furnace in spray drenches Rotary Water cold quenching outward, stepped start-stop system low temperature 620 ~ 710 DEG C of process furnace tempering air coolings, hot straightening, hot size obtain final size qualified R-Lay laying strain anticorrosive seamless line pipe with the Chinese People's Anti-Japanese Military and Political College;
C. described step b produces the ocean environment R-Lay obtained and lays the mechanical property straining anticorrosive seamless line pipe with the Chinese People's Anti-Japanese Military and Political College: yield strength>=415MPa, tensile strength>=530MPa, yield tensile ratio≤0.90, horizontal full-scale Charpy-V impact power>=300J at-20 DEG C, shear area 100%, hardness≤230HV10, grain fineness number 9 grades ~ 14 grades, metallographic structure are duplex structure B
return+ F or complex tissue B
return+ S
return+ F;
D. the described ocean environment R-Lay paving mode corrosion resistance test of Chinese People's Anti-Japanese Military and Political College's strain hydrogen sulfide corrosion resistant high intensity seamless line pipe: soak 96 hours test samples under NACEA solution, be and occur crackle, meet crack length rate≤5%, crack thickness rate≤3, the hic resistance corrosive nature requirement of crack-sensitivity rate≤1.5%; Specimen size 115mmx15mmx5mm, under NACEA solution, loads 100% SMYS, test period >=96h, and after off-test, sample does not have any as seen more than cracking or the crackle of 0.1mm;
E. described ocean environment R-Lay paving mode Chinese People's Anti-Japanese Military and Political College's strain property test of Chinese People's Anti-Japanese Military and Political College's strain hydrogen sulfide corrosion resistant high intensity seamless line pipe: first adopt special fixture to carry out Chinese People's Anti-Japanese Military and Political College's strain-gauge test in tensile testing machine having the sample of performance in step c, first after plasticity 3% distortion moved to by sample, push back former length again, circulation like this three times, specimen length guarantees the length met after deformation required for follow-up test, sample after gross distortion is 250 DEG C of timeliness in temperature, process after being incubated 1 hour, processing stretch ratio sample, hardness specimens, impact specimen, HIC sample and SSC sample, carry out tension test, hardness test, impact of collision is tested, HIC and SSC tests, test-results requires below will meeting: yield strength >=415MPa, tensile strength >=530MPa, yield tensile ratio≤0.90, full-scale Charpy-V impact power >=200J and shear area 100%, cracking is there is not after HIC and SSC96 hour,
F. the described ocean environment R-Lay paving mode dimensional precision of Chinese People's Anti-Japanese Military and Political College's strain hydrogen sulfide corrosion resistant high intensity seamless line pipe: outer tube diameter tolerance≤± 0.5%OD, outer (interior) footpath tolerance≤± 1.6mm of pipe end, full accuracy can pour into-0.8mm ~+1.6mm, wall thickness tolerance≤± 10%t, ovality tolerance≤1%OD, length tolerance≤± 25.4mm.
Effect of the present invention adopts this submarine seamless line pipe tension and compression 3 energy proof strengths that circulate under 3% strain to be greater than 415MPa,-20 DEG C of ballistic works are greater than 300J, obvious intensity is not had sharply to reduce, also there is good hic resistance and SSC performance, crack-sensitivity rate, crack length rate and crack thickness rate are 0, meet crack-sensitivity rate (CSR)≤1.5% completely, crack length rate≤5%,, there is not fracture and cracking after 720 hours in the corrosive nature requirement of crack thickness rate (CTR)≤3% simultaneously.Line pipe of the present invention has been tried out in region, the European North Sea, and result of use is good, meets site operation requirement, has good welding property, corrosion resistance and Chinese People's Anti-Japanese Military and Political College's strain property.
Accompanying drawing explanation
Fig. 1 is the metallographic structure B of line pipe embodiment of the present invention
return+ S
return+ F500 ×;
Fig. 2 is the metallographic structure B of line pipe embodiment of the present invention
return+ F500 ×;
Fig. 3 is the tension and compression cycle diagram of line pipe embodiment of the present invention;
Fig. 4 line pipe embodiment of the present invention series impact merit graphic representation;
Fig. 5 is the effect of the inventive method Trace Titanium Treatment.
Embodiment
By reference to the accompanying drawings the ocean environment R-Lay laying manufacture method that the Chinese People's Anti-Japanese Military and Political College strains anticorrosive seamless line pipe of the present invention is illustrated.
Ocean environment R-Lay of the present invention lays the manufacture method straining anticorrosive high intensity seamless line pipe with the Chinese People's Anti-Japanese Military and Political College, the method manufacture is applicable to shallow sea, deep-sea pipe crimping mode is laid there is repeatedly winding-stretching circulation after still can meet the line pipe of sour environment with anticorrosive high strength >=415MPa, the method comprises the following steps:
A. the described ocean environment R-Lay that the prepares burden laying Ingredients Weight % that the Chinese People's Anti-Japanese Military and Political College strains anticorrosive seamless line pipe is: C0.05 ~ 0.13%, Si0.20 ~ 0.40%, Mn1.0 ~ 1.40%, P≤0.010%, S≤0.002%, Ni0.05 ~ 0.30%, Cr0.05 ~ 0.30%, Mo0.05 ~ 0.15%, Als0.010 ~ 0.050%, N≤0.010%, Nb0.010 ~ 0.050%, V0.03 ~ 0.08%, Cu0.05 ~ 0.25%, Ti0.008 ~ 0.030%, Ca0.0005 ~ 0.0040%, Pb≤0.020%, Sn≤0.020%, As≤0.030%, Sb≤0.015%, Bi≤0.015%, B≤0.0005%, surplus is Fe and impurity, carbon equivalent ce pcm≤0.22%, CE II W≤0.39%.Ni+Mo+Cr+Cu≤0.8％；Pb+Sn+As+Sb+Bi≤0.030％；
B. the production process that ocean environment R-Lay described in tubulation lays with the Chinese People's Anti-Japanese Military and Political College strains anticorrosive seamless line pipe comprises: steel-making, two roller MPM or three rod PQF Continuous mill train continuous mill oblique millings, modifier treatment, secondary Calcium treatment is adopted to reduce Impurity S con-tent, Trace Titanium Treatment improves blank hot plasticity and ensures cc billet surface quality, and end induction stirring reduces component segregation; Adopt two roller MPM or three rod PQF Continuous mill train tandem rollings to obtain the specification series of 60.3mm ~ 508mm, then roll state pipe in conjunction with 720REM unit production 508 ~ 711mm specification series; Roll after cooling state pipe after the heating of stepped start-stop system high temperature 910 ~ 980 DEG C of process furnace in spray drenches Rotary Water cold quenching outward, stepped start-stop system low temperature 620 ~ 710 DEG C of process furnace tempering air coolings, hot straightening, hot size obtain final size qualified R-Lay laying strain anticorrosive seamless line pipe with the Chinese People's Anti-Japanese Military and Political College;
C. described step b produces the ocean environment R-Lay obtained and lays the mechanical property straining anticorrosive seamless line pipe with the Chinese People's Anti-Japanese Military and Political College: yield strength>=415MPa, tensile strength>=530MPa, yield tensile ratio≤0.90, horizontal full-scale Charpy-V impact power>=300J at-20 DEG C, shear area 100%, hardness≤230HV10, grain fineness number 9 grades ~ 14 grades, metallographic structure are duplex structure B
return+ F or complex tissue B
return+ S
return+ F;
D. the described ocean environment R-Lay paving mode corrosion resistance test of Chinese People's Anti-Japanese Military and Political College's strain hydrogen sulfide corrosion resistant high intensity seamless line pipe: soak 96 hours test samples under NACEA solution, be and occur crackle, meet crack length rate≤5%, crack thickness rate≤3, the hic resistance corrosive nature requirement of crack-sensitivity rate≤1.5%; Specimen size 115mmx15mmx5mm, under NACEA solution, loads 100% SMYS, test period >=96h, and after off-test, sample does not have any as seen more than cracking or the crackle of 0.1mm;
E. described ocean environment R-Lay paving mode Chinese People's Anti-Japanese Military and Political College's strain property test of Chinese People's Anti-Japanese Military and Political College's strain hydrogen sulfide corrosion resistant high intensity seamless line pipe: first adopt special fixture to carry out Chinese People's Anti-Japanese Military and Political College's strain-gauge test in tensile testing machine having the sample of performance in step c, first after plasticity 3% distortion moved to by sample, push back former length again, circulation like this three times, specimen length guarantees the length met after deformation required for follow-up test, sample after gross distortion is 250 DEG C of timeliness in temperature, process after being incubated 1 hour, processing stretch ratio sample, hardness specimens, impact specimen, HIC sample and SSC sample, carry out tension test, hardness test, impact of collision is tested, HIC and SSC tests, test-results requires below will meeting: yield strength >=415MPa, tensile strength >=530MPa, yield tensile ratio≤0.90, full-scale Charpy-V impact power >=200J and shear area 100%, cracking is there is not after HIC and SSC96 hour,
F. the described ocean environment R-Lay paving mode dimensional precision of Chinese People's Anti-Japanese Military and Political College's strain hydrogen sulfide corrosion resistant high intensity seamless line pipe: outer tube diameter tolerance≤± 0.5%OD, outer (interior) footpath tolerance≤± 1.6mm of pipe end, full accuracy can pour into-0.8mm ~+1.6mm, wall thickness tolerance≤± 10%t, ovality tolerance≤1%OD, length tolerance≤± 25.4mm.
The chemical composition of concrete optimization is described as follows:
C: intensity element, considers that welding property is so place restrictions on its content in 0.05 ~ 0.13% scope.
Si: intensity element, considers toughness and solidity to corrosion, so placed restrictions in 0.20 ~ 0.40% scope by its content.
Mn: intensity element, considers low-temperature flexibility and Properties of HIC resistance, so placed restrictions in 1.0 ~ 1.40% scopes by its content.
P, S:P and S are impurity elements.Reduce its content in steelmaking process, impurity content controls at P≤0.010%, S≤0.002% as far as possible.
Als:Al is deoxidant element, and Als more can reflect real aluminium content, its content lower than 0.005% time can not reach deoxidation effect, but during too high levels, easily cause oxide inclusion, so placed restrictions in Als0.010 ~ 0.050% scope by its content.
Nb: micro alloying element, crystal grain thinning, improves corrosion resistance.Control its content in 0.010 ~ 0.050% scope.
V: microalloy element, precipitation strength improves the intensity of steel.Control V content is in 0.05 ~ 0.09% scope.
Ti: microalloy element, crystal grain thinning, improves intensity and surface quality.Control its content 0.008 ~ 0.030%.Micro-Ti process is the surface quality ensureing steel pipe by adding the thermoplasticity improving steel pipe on a small quantity.
Cr: alloy element, improves intensity and ensures soft, control its scope content in 0.05 ~ 0.30% scope.
Mo: alloy element, improves intensity and corrosion resistance, controls its content in 0.05 ~ 0.15% scope.
Ni: alloy element, improves intensity, erosion resistance and low-temperature flexibility, controls its content in 0.05 ~ 0.30% scope.
Cu: alloy element, improves Properties of HIC resistance, controls its content in 0.05 ~ 0.25% scope.
Ca: calcium is very easily oxidized, general recovery rate is low especially, and Calcium treatment is difficult to the content ensureing to meet required for spheroidizing, therefore carries out secondary Calcium treatment, ensures that calcium contents is 0.0005 ~ 0.0040%.Secondary Calcium treatment, after VD or RH, carries out before upper continuous casting, ensures the recovery rate of Ca, can meet CaS nodularization requirement, again can crystal grain thinning, improves corrosion resistance.The effect of secondary Calcium treatment is shown in Fig. 1, reacts 45 stove major part calcium contentss about 0.0020%.
O, N, H: elemental gas, consider corrosive nature, surface quality etc., control lower aq as far as possible.N≤0.010％，O≤0.0020％，H≤0.00002％。
Pb, Sn, As, Sb, Bi: five-harmful elements, the inevitable impurity of steel grade.But its too high levels can cause steel tube surface to crack, also unfavorable to corrosion resistance, control its content at Pb≤0.020%, Sn≤0.020%, As≤0.030%, Sb≤0.015%, Bi≤0.015%.Pb+Sn+As+Sb+Bi≤0.030％。
B: residual element.Consider surface quality and the welding property of steel, control its content in≤0.0005% scope.
Comprise by the production process of Chinese People's Anti-Japanese Military and Political College's strain hydrogen sulfide corrosion resistant high intensity seamless line pipe according to the ocean environment R-Lay paving mode of mentioned component configuration: steel-making, seamless oblique milling (MPM or PQF milling train), modifier treatment.
Steel making working procedure: adopt high-quality steel scrap, tube head and molten iron (molten iron proportion >=30%) to be raw material, feeds silk process, continuous casting by EAF electric furnace, LF refining, VD or RH vacuum oven, FW.
Steel-making new technology: (1) is fed pompon and is treated to pure Ca silk, feed quantity >=50m/ stove.(2) secondary Calcium treatment, improves the recovery rate of calcium, reduces S content.(3) Trace Titanium Treatment, improves blank hot plasticity, avoids strand to produce transverse crack, as shown in Figure 5.Control straightening temperature and be greater than 950 DEG C.(5) except M-EMS, increase and adopt end induction stirring, reduce strand component segregation, improve the corrosion resistance of material.
Tube rolling operation: cold centering, perforation, two roller MPM or three rod PQF Continuous mill train tandem rollings, sizing, the large cold bed cooling of walking beam; Adopt two roller MPM or three rod PQF Continuous mill train tandem rollings can obtain the specification series of 60.3mm ~ 508mm, 508 ~ 711mm specification series can be produced in conjunction with 720REM unit.
Heat treatment step: roll state pipe cold quenching, stepped start-stop system low-temperature heat stove tempering air cooling, hot straightening, hot size after the heating of stepped start-stop system high-temperature heater after cooling and obtain the qualified steel pipe of final size.
The ocean environment R-Lay paving mode that the present invention the makes mechanical property of Chinese People's Anti-Japanese Military and Political College's strain hydrogen sulfide corrosion resistant high intensity seamless line pipe: yield strength:>=415MPa, tensile strength:>=530MPa, yield tensile ratio :≤0.90, horizontal full-scale Charpy-V impact power>=300J at-20 DEG C, shear area 100%, there is fabulous low-temperature flexibility, even if at-80 DEG C, ballistic work also can at more than 150J, as shown in Figure 4, hardness≤230HV10, grain fineness number 9 grades or thinner, metallographic structure: duplex structure B
return+ F or complex tissue B
return+ S
return+ F (adding the tubing of Cr, Mo, Ni alloy all more than more than 0.1%), as depicted in figs. 1 and 2.
The ocean environment R-Lay paving mode that the present invention the makes corrosion resistance of Chinese People's Anti-Japanese Military and Political College's strain hydrogen sulfide corrosion resistant high intensity seamless line pipe: soak 96 hours test samples under NACEA solution, all there is not crackle, meet crack length rate≤5%, crack thickness rate≤3, the corrosion resistance requirement of crack-sensitivity rate≤1.5%, has excellent Properties of HIC resistance; Specimen size 115mmx15mmx5mm, under NACEA solution, loads 100% SMYS (415MPa), test period >=96h.After off-test, sample does not have any as seen more than cracking or the crackle of 0.1mm.
Ocean environment R-Lay paving mode of the present invention Chinese People's Anti-Japanese Military and Political College's strain property of Chinese People's Anti-Japanese Military and Political College's strain hydrogen sulfide corrosion resistant high intensity seamless line pipe: first adopt special fixture to carry out Chinese People's Anti-Japanese Military and Political College's strain-gauge test in tensile testing machine having the sample of performance in step 3, first after plasticity 3% distortion moved to by sample, push back former length again, circulation like this three times, as shown in Figure 3, specimen length guarantees the length met after deformation required for follow-up test, sample after gross distortion is 250 DEG C of timeliness in temperature, process after being incubated 1 hour, processing stretch ratio sample, hardness specimens, impact specimen, HIC sample and SSC sample, carry out tension test, hardness test, impact of collision is tested, HIC and SSC tests, test-results requires below will meeting: yield strength >=415MPa, tensile strength >=530MPa, yield tensile ratio≤0.90, full-scale Charpy-V impact power >=200J and shear area 100%, cracking is there is not after HIC and SSC96 hour.
The described ocean environment R-Lay paving mode dimensional precision of Chinese People's Anti-Japanese Military and Political College's strain hydrogen sulfide corrosion resistant high intensity seamless line pipe: outer tube diameter tolerance≤± 0.5%OD, outer (interior) footpath tolerance≤± 1.6mm of pipe end, full accuracy can pour into-0.8mm ~+1.6mm, wall thickness tolerance≤± 10%t, ovality tolerance≤1%OD, length tolerance≤± 25.4mm.
The ocean environment R-Lay paving mode of the present invention line pipe of Chinese People's Anti-Japanese Military and Political College's strain hydrogen sulfide corrosion resistant high strength has good Chinese People's Anti-Japanese Military and Political College's strain property, and the lower tension and compression of 3% strain 3 the energy proof strengths that circulate are greater than 415MPa, and-20 DEG C of ballistic works are greater than 300J.Also there is good hic resistance and SSC performance, crack-sensitivity rate (CSR)≤1.5%, crack length rate≤5%, crack thickness rate (CTR)≤3%.
Configure the seamless line pipe obtained by mentioned component, with 415SPDF grade of steel, specification 219.1mm × 15.9mm 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.Anti-SSC performance is as table 4.Chinese People's Anti-Japanese Military and Political College's strain property is as table 5.
Tubing chemical composition meets the requirement of mentioned component configuration completely, S and P content is lower, each stove component content deviation is very little, carries out temperature control when stable component content is conducive to thermal treatment, thus provides precondition for tubing has good structure and properties.
As can be seen from Table 2, seamless line pipe of the present invention has high strength, soft (≤230HV10), high impact toughness.Having very low hardness value is that very high corrosion resistance is given security.From hic resistance test-results table 3, there is very strong Properties of HIC resistance, all do not find hydrogen induced cracking (HIC) crackle and hydrogen blistering, crack-sensitivity rate (CSR)≤0%, crack length rate≤0%, crack thickness rate (CTR)≤0%.Can find out high-load from table 4 under, seamless line pipe product of the present invention still has good anti-SSC performance, does not occur cracking and crackle.Table 5 can meet the demands in the tension and compression performance after 3 times that circulates, and has good Chinese People's Anti-Japanese Military and Political College's strain property.
The embodiment chemical composition of table 1 line pipe of the present invention
| Element | Composition 1 | Composition 2 | Composition 3 | Composition 4 | Composition 5 | Composition 6 |
| C | 0.09 | 0.10 | 0.11 | 0.12 | 0.13 | 0.10 |
| Si | 0.17 | 0.25 | 0.22 | 0.20 | 0.25 | 0.22 |
| Mn | 1.20 | 1.30 | 1.28 | 1.20 | 1.10 | 1.15 |
| P | 0.010 | 0.010 | 0.010 | 0.010 | 0.010 | 0.011 |
| S | 0.001 | 0.001 | 0.001 | 0.002 | 0.001 | 0.002 |
| Ni | 0.20 | 0.10 | 0.12 | 0.11 | 0.05 | 0.05 |
| Cr | 0.20 | 0.10 | 0.15 | 0.10 | 0.15 | 0.20 |
| Mo | 0.22 | 0.12 | 0.10 | 0.05 | 0.08 | 0.06 |
| Cu | 0.09 | 0.12 | 0.15 | 0.06 | 0.10 | 0.08 |
| Als | 0.030 | 0.033 | 0.028 | 0.035 | 0.034 | 0.032 |
| V | 0.05 | 0.07 | 0.08 | 0.07 | 0.05 | 0.07 |
| Nb | 0.032 | 0.023 | 0.035 | 0.045 | 0.045 | 0.032 |
| TI | 0.010 | 0.008 | 0.012 | 0.009 | 0.010 | 0.011 |
| Ca | 0.0015 | 0.0018 | 0.0020 | 0.0028 | 0.0013 | 0.0020 |
| N | 0.0046 | 0.0052 | 0.0038 | 0.0075 | 0.0055 | 0.0040 |
| 、Pb、 | 0.00012 | 0.00010 | 0.00011 | 0.00012 | 0.00011 | 0.00012 |
| Sn | 0.0025 | 0.0033 | 0.0028 | 0.0030 | 0.0032 | 0.0033 |
| As | 0.0050 | 0.0045 | 0.0035 | 0.0056 | 0.0050 | 0.0054 |
| Sb | 0.00112 | 0.00100 | 0.00112 | 0.00100 | 0.00112 | 0.00100 |
| Bi | 0.0004 | 0.0006 | 0.0007 | 0.0005 | 0.0008 | 0.0007 |
| CEpcm | 0.193 | 0.201 | 0.213 | 0.207 | - | 0.193 |
| CE ⅡW | - | - | - | - | 0.379 | - |
Note: Ni+Mo+Cr+Cu≤0.8%; Pb+Sn+As+Sb+Bi≤0.030%
The mechanical property of table 2 line pipe embodiment of the present invention and metallographic
The hic resistance test-results of table 3 line pipe embodiment of the present invention
The hic resistance test-results of table 4 line pipe embodiment of the present invention
Mechanical property after 3% tension and compression circulation of table 5 line pipe embodiment of the present invention
Claims (2)
1. an ocean environment R-Lay lays the manufacture method straining anticorrosive high intensity seamless line pipe with the Chinese People's Anti-Japanese Military and Political College, the method manufacture is applicable to shallow sea, deep-sea pipe crimping mode is laid there is repeatedly winding-stretching circulation after still can meet the line pipe of sour environment with anticorrosive high strength >=415MPa, the method comprises the following steps:
A. the described ocean environment R-Lay that the prepares burden laying Ingredients Weight % that the Chinese People's Anti-Japanese Military and Political College strains anticorrosive seamless line pipe is: C0.05 ~ 0.13%, Si0.20 ~ 0.40%, Mn1.0 ~ 1.40%, P≤0.010%, S≤0.002%, Ni0.05 ~ 0.30%, Cr0.05 ~ 0.30%, Mo0.05 ~ 0.15%, Als0.010 ~ 0.050%, N≤0.010%, Nb0.010 ~ 0.050%, V0.03 ~ 0.08%, Cu0.05 ~ 0.25%, Ti0.008 ~ 0.030%, Ca0.0005 ~ 0.0040%, Pb≤0.020%, Sn≤0.020%, As≤0.030%, Sb≤0.015%, Bi≤0.015%, B≤0.0005%, surplus is Fe and impurity, carbon equivalent ce pcm≤0.22%, CE II W≤0.39%.Ni+Mo+Cr+Cu≤0.8％；Pb+Sn+As+Sb+Bi≤0.030％；
B. the production process that ocean environment R-Lay described in tubulation lays with the Chinese People's Anti-Japanese Military and Political College strains anticorrosive seamless line pipe comprises: steel-making, two roller MPM or three rod PQF Continuous mill train continuous mill oblique millings, modifier treatment, secondary Calcium treatment is adopted to reduce Impurity S con-tent, Trace Titanium Treatment improves blank hot plasticity and ensures cc billet surface quality, and end induction stirring reduces component segregation; Adopt two roller MPM or three rod PQF Continuous mill train tandem rollings to obtain the specification series of 60.3mm ~ 508mm, then roll state pipe in conjunction with 720REM unit production 508 ~ 711mm specification series; Roll after cooling state pipe after the heating of stepped start-stop system high temperature 910 ~ 980 DEG C of process furnace in spray drenches Rotary Water cold quenching outward, stepped start-stop system low temperature 620 ~ 710 DEG C of process furnace tempering air coolings, hot straightening, hot size obtain final size qualified R-Lay laying strain anticorrosive seamless line pipe with the Chinese People's Anti-Japanese Military and Political College;
C. described step b produces the ocean environment R-Lay obtained and lays the mechanical property straining anticorrosive seamless line pipe with the Chinese People's Anti-Japanese Military and Political College: yield strength>=415MPa, tensile strength>=530MPa, yield tensile ratio≤0.90, horizontal full-scale Charpy-V impact power>=300J at-20 DEG C, shear area 100%, hardness≤230HV10, grain fineness number 9 grades ~ 14 grades, metallographic structure are duplex structure B
return+ F or complex tissue B
return+ S
return+ F;
D. the described ocean environment R-Lay paving mode corrosion resistance test of Chinese People's Anti-Japanese Military and Political College's strain hydrogen sulfide corrosion resistant high intensity seamless line pipe: soak 96 hours test samples under NACEA solution, be and occur crackle, meet crack length rate≤5%, crack thickness rate≤3, the hic resistance corrosive nature requirement of crack-sensitivity rate≤1.5%; Specimen size 115mmx15mmx5mm, under NACEA solution, loads 100% SMYS, test period >=96h, and after off-test, sample does not have any as seen more than cracking or the crackle of 0.1mm;
E. described ocean environment R-Lay paving mode Chinese People's Anti-Japanese Military and Political College's strain property test of Chinese People's Anti-Japanese Military and Political College's strain hydrogen sulfide corrosion resistant high intensity seamless line pipe: first adopt special fixture to carry out Chinese People's Anti-Japanese Military and Political College's strain-gauge test in tensile testing machine having the sample of performance in step c, first after plasticity 3% distortion moved to by sample, push back former length again, circulation like this three times, specimen length guarantees the length met after deformation required for follow-up test, sample after gross distortion is 250 DEG C of timeliness in temperature, process after being incubated 1 hour, processing stretch ratio sample, hardness specimens, impact specimen, HIC sample and SSC sample, carry out tension test, hardness test, impact of collision is tested, HIC and SSC tests, test-results requires below will meeting: yield strength >=415MPa, tensile strength >=530MPa, yield tensile ratio≤0.90, full-scale Charpy-V impact power >=200J and shear area 100%, cracking is there is not after HIC and SSC96 hour,
F. the described ocean environment R-Lay paving mode dimensional precision of Chinese People's Anti-Japanese Military and Political College's strain hydrogen sulfide corrosion resistant high intensity seamless line pipe: outer tube diameter tolerance≤± 0.5%OD, outer (interior) footpath tolerance≤± 1.6mm of pipe end, full accuracy can pour into-0.8mm ~+1.6mm, wall thickness tolerance≤± 10%t, ovality tolerance≤1%OD, length tolerance≤± 25.4mm.
2. one kind adopts manufacture method according to claim 1 production ocean environment R-Lay laying to strain anticorrosive seamless line pipe with the Chinese People's Anti-Japanese Military and Political College.
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| CN111187978A (en) * | 2020-01-16 | 2020-05-22 | 天津钢管制造有限公司 | Phi 559 mm-711 mm large-caliber oblique rolling rotary-expansion seamless pipeline pipe and manufacturing method thereof |
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