CN103510003A - Large deformation resistant multiphase X100 high-strength steel plate for large diameter pipeline and manufacturing method for steel plate - Google Patents
Large deformation resistant multiphase X100 high-strength steel plate for large diameter pipeline and manufacturing method for steel plate Download PDFInfo
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Abstract
The invention belongs to the technical field of manufacturing of low-alloy high-strength pipeline steel, and particularly relates to a large deformation resistant multiphase X100 high-strength steel plate for a large diameter pipeline and a manufacturing method for the steel plate. The high-strength steel plate is prepared from the following components by weight percent: 0.04-0.08% of C, 0.15-0.35% of Si, 1.60-2.00% of Mn, less than or equal to 0.008% of P, less than or equal to 0.003% of S, 0.07-0.11% of Nb, 0.015-0.025% of Ti, less than or equal to 0.25% of Mo, less than or equal to 0.35% of Cu, less than or equal to 0.030% of Ni, less than or equal to 0.030% of Cr, and the balance of Fe and unavoidable impurities. The high-strength pipeline steel has the following benefits: the P content maximum value in the component design is 0.010%; the S content maximum value is 0.003%; the steel is purer; the high-niobium component design can significantly improve the crystal refinement and the strength of the steel plate, so that the noble metals such as Mo and Ni of the steel plate are reduced; the cost is lower; the energy saving and environmental protection effects are realized; the high-strength steel plate is suitable for material development direction, and easier to produce and promote. The yield strength of the steel plate is 690-760 MPa; the tensile strength is 870-920 MPa; the uniform ductility is greater than or equal to 10%; the yield ratio is less than or equal to 0.78; the Charpy impact power at -20 DEG C is greater than or equal to 300 J; the drop hammer tearing test shear area at -15 DEG C is greatert than or equal to 85%.
Description
Technical field
The invention belongs to low-alloy high-strength pipe line steel manufacturing technology field, more specifically a kind of large diameter pipeline is out of shape heterogeneous X100 High Strength Steel Plate and manufacture method thereof with the Chinese People's Anti-Japanese Military and Political College.
Background technology
Along with the domestic and international continuous demand to the oil and gas energy, the engineering construction of long distance oil-gas transport pipe is more and more.Pipeline, towards the development of heavy caliber, high pressure-bearing, is to reduce engineering construction material cost, and improving strength of materials attenuate duct thickness becomes and reduce costs best means.Takeuchi studies have shown that, in the situation that other factors is constant, along with the rising of steel strength, effective plasticity of material declines gradually, and its uniform elongation is reduction trend.And one of challenging field of the tool of pipe-line construction is seismic region and permafrost band, may there is large viscous deformation in these regional buried pipelines, and line pipe needs the performance of higher incompressible and tension strain.In recent years, for improving air input efficiency, the pipeline that diameter is greater than 1000mm is applied in long apart from Natural Gas Transmission Pipeline Engineering again and again with high tensile steel plate, more than steel plate width reaches 3700mm, the thickness evenness of the template of steel plate, planeness, steel plate, that even intensity is controlled difficulty is larger, for the production of hot rolling Plate Steel, is a challenge greatly.For guaranteeing pipeline transportation security, based on stress design principle, the heavy caliber high-strength X100 Pipeline Steel Plate with the heterogeneous fine grained texture of property of resisting large deformation is subject to research, planner praises highly.
For meeting the requirements such as X100 pipeline steel strength, toughness, anti-strain property, weldability, homogeneity, must at the beginning of production technique and Composition Design, just according to large-deformation-resistance pipeline steel standard, formulate, adopt these technology that safe and reliable system can be provided, guarantee economic solution, the novelty design based on stress design has solved the practical problems of high-strength line-pipe steel application in engineering is carried simultaneously.
Before the present invention, there is the research of the distortion X100 of the relevant Chinese People's Anti-Japanese Military and Political College of Japanese JFE company hot-rolled steel sheet, but the tissue of the Japanese distortion X100 of Chinese People's Anti-Japanese Military and Political College steel plate is designed to bainite+Ma Ao island (B+M/A) duplex structure, and technological design is TMCP+HOP technique, as shown in Figure 1.Therefore Chinese People's Anti-Japanese Military and Political College's distortion X100 Pipeline Steel Plate that they are produced obtains by HOP technique, their tissue is to consist of bainite+Ma Ao island (B+M/A) dual phase microstructure, the obdurability of this tissue is fine, but plasticity is not fine, can not meet steel plate in length and breadth to the requirement of uniform elongation.If it is bad that the while is controlled because M-A organizes, can form thick M-A tissue, very unfavorable to the toughness of steel plate and arrest toughness, although therefore this invention is feasible, need to invest online equipment for Heating Processing, cost is higher, and process window is very narrow, actually operating difficulty is large.And the domestic this duplex structure filing an application can obtain by multicomponent microalloying design and the specific Controlled Rolling And Controlled Cooling of low C.Duplex structure consists of ferrite+bainite (F+B) dual phase microstructure.
The patent of invention comparatively close with the present invention has: 1) Chinese patent, application (patent) number: CN201010541219.4, a kind of X100 large-deformation-resistance pipeline steel and manufacturing process thereof; 2) Chinese patent, application (patent) number: CN201210327206.6, resistance to deformation X80-X100 Pipeline Steel Plate and manufacture method thereof; 3) Chinese patent, application (patent) number: CN200810234506.3, high strength X 100 pipeline steel and production technique thereof that a kind of Steckel mill is produced; 4) Chinese patent, application (patent) number: CN201210039663.5, high-strength high-toughness X 100 pipeline steel hot-rolled steel strip and manufacture method thereof; 5) Chinese patent, application (patent) number: CN201110282962.7, X100 Pipeline Steel Plate of a kind of excellent in low temperature toughness and preparation method thereof; 6) Chinese patent, application (patent) number: CN200810012150.9, a kind of high strength X 100 pipeline steel hot rolled slab and production method thereof; 7) Chinese patent, application (patent) number: CN201110062241.5, superhigh strength X 100 pipeline steel and production method thereof;
In above patent documentation, only have 1) and 2) be the pipe line steel with property of resisting large deformation, all the other are the X100 pipe line steels based on stress design, are organized as single bainite structure, intensity is high, and yield tensile ratio is higher, and unit elongation is lower, especially without the requirement of uniform elongation, poor stability; And 1) in S content maximum value be 0.004%, 2) in S content maximum value be 0.005%, P content maximum value 0.015%, 1) Charpy-V impact power lower limit 150J at product performance-20 of announcing ℃, 2) Charpy-V impact power lower limit 250J at product performance-20 of announcing ℃.
Summary of the invention
The object of this invention is to provide the distortion X100 of Chinese People's Anti-Japanese Military and Political College pipeline steel hot rolled steel plate for a kind of large diameter pipeline, it has the high-intensity while, there is good low-temperature flexibility, high arrest toughness and property of resisting large deformation, be applicable to the petroleum-gas pipeline engineering construction project that diameter is greater than 1016mm.
The present invention is achieved by the following technical solutions: resistance to deformation X100 polyphase steel plate for a kind of heavy caliber petroleum natural gas line, and it is comprised of component once by weight percentage: C:0.04～0.08%, Si:0.15～0.35%, Mn:1.60～2.00%, P≤0.008%, S≤0.003%, Nb:0.07～0.11%, Ti:0.015～0.025%, Mo≤0.25%, Cu≤0.35%, Ni≤0.030%, Cr≤0.030%, all the other are Fe and inevitable impurity.
The chemical composition of above-mentioned steel plate meets Pcm=C+Si/30+Ni/60+ (Mn+Cr+Cu)/20+Mo/15+V/10+5B≤0.20%.
In its Composition Design, the effect of each element is as follows:
C: carbon is that improving intensity main is also the most cheap element, along with the increase of carbon content, the strength increase of steel, but welding property and the plasticity and toughness variation of while steel plate, therefore the present invention selects low-carbon (LC) Composition Design, makes steel plate have good plasticity and toughness and good welding property.
Mn: manganese is the effective element that improves intensity and toughness, and it is weak carbide forming element, its effect in smelting is deoxidation and the impact of eliminating sulphur, can also reduce austenite transformation temperature, refinement ferrite crystal grain is useful to improving armor plate strength and toughness.Simultaneously can also solution strengthening ferrite and the hardening capacity that increases steel.Under low-carbon (LC) condition, it has significant promoter action to bainite transformation.But during Mn too high levels, hardening of steel and ductility degenerates.Mn is because of its successful, with low costly in quality plate is produced, becomes one of main interpolation element.
Si: silicon plays the effect of reductor has solution strengthening effect simultaneously, can also delay greatly the formation of carbide, and growing up of hysteresis cementite, has increased stabilization of austenite.But Si content is high, and steel grade is prone to inclusion, and steel easily get rusty, in hot rolling production, iron rust is easily rolled into steel plate top layer, pot galvanize poor performance, and Si demonstrates local brittle zone when multithreading is welded simultaneously hazardness.
Cu: the precipitation strength of copper is to improve the important means of the intensity of steel, in addition, Cu to the solidity to corrosion of steel, improve weldability, low-temperature flexibility, formability and machinability etc. and be all highly profitable.But on the other hand, when Cu content is high, easily crack when continuous casting steel billet heating or hot rolling, worsen surface of steel plate performance, must add appropriate Ni to stop the generation of this crackle according to the difference of intensity rank and steel plate thickness.
Ni: Nie Dui welded heat affecting zone hardening and toughness do not have detrimentally affect, can make again the intensity of mother metal improve, and low-temperature flexibility is improved greatly.But it is compared with noble element, cause the cost of steel significantly to rise, less economical.The object of adding Ni element in steel is mainly to stop containing Cu to measure the tendency that high steel billet cracks when heating or the hot rolling.According to the content of Cu, Ni content is controlled to 0.7-1 times of Cu content.
Ti: adding micro-titanium, is for the nitrogen element in fixing steel.Ti has strong precipitation strength effect in addition, can improve the intensity of steel, the influence that the hardness at place, welded heat affecting zone has also been had in the best condition, the grain coarsening that the existence of the nitride particles of Ti can suppress welded heat affecting zone stops steel billet the growing up of crystal grain in heating, rolling, welding process, improves the toughness of mother metal and welded heat affecting zone.Ti is lower than 0.005% time, Gu N weak effect, while surpassing 0.03%, solid N effect reaches capacity, and superfluous Ti can separately or form carbonitride together with Nb, strengthens steel, but forms sometimes the precipitated phase of bulk, will make the toughness deterioration of steel.When the ratio of the Ti in steel, N atom is 1:1, the most tiny and distribution disperse of TiN particle, the strongest to the refining effect of high temperature austenite crystal grain, not only good toughness can be obtained, and Large Heat Input Welding more than 30KJ/cm can be realized.But too much Ti content can cause the alligatoring of the nitride of titanium, unfavorable to low-temperature flexibility.Therefore, generally by Ti Composition Control in 0.02% left and right.
Mo: improve the hardening capacity of steel to improve the intensity of mother metal, can improve the solidity to corrosion of steel plate simultaneously with the element acting in conjunction such as Cu, Ni.Mo belongs to the element that dwindles austenite phase region, and it is present in the sosoloid and carbide of steel, has solution strengthening effect.In Carbide Phases, when Mo content is lower, form compound cementite with iron and carbon, when content is higher, form its alloy carbide.The velocity of diffusion of Mo is much smaller than the velocity of diffusion of C.Therefore, it can slow down the dissolution rate of carbide in austenite at steel grade, to steel, by austenite decomposition, be that pearlitic transformation has strong restraining effect, but the impact on the velocity of transformation that is bainite by austenite decomposition is insignificant, hypoeutectoid steel is separated out to ferritic speed by austenite decomposition also restraining effect, is therefore conducive to obtain bainitic steel.According to performance requriements and economic factors, consider, the Mo adding is generally no more than 0.3%.
Cr: the interpolation of chromium can reduce the transformation temperature of steel grade, thinning microstructure, effectively improves intensity, can also improve steel grade oxidation-resistance and high temperature corrosion-resisting performance etc., but Cr crosses and separates out at most thickly, causes the embrittlement of steel, bad to welding property, thus Cr content be designed to≤0.30%.
Above-mentioned a kind of heavy caliber petroleum natural gas line with the manufacture method of resistance to deformation X100 polyphase steel plate comprise the steps: that proportioning is got the raw materials ready, the operation such as molten iron KR desulfurization processing, converter smelting, CAS Argon, the refining of LF+RH duplex practice, sheet billet continuous casting, slab reheat, two-stage control rolling, pre-straightening, control multipath are cooling, aligning, stacking slow cooling, UT (Ultrasonic Testing).
Rear molten steel sulfur content≤0.004%, converter smelting endpoint C≤0.04% are processed in above-mentioned molten iron KR desulfurization, P≤0.007%, and CAS carries out after Al deoxidation, and [O] reaches 25-30ppm, and LF adds Nb, adds Ti, SiCa line to process, nodularization inclusion morphology in RH.
Smelting steel process of the present invention is controlled alloying element addition sequence: after converter, carry out deoxidation treatment, during deoxidation, AL add-on is abundant, and a deoxidation is abundant, in the LF later stage, add aluminum shot deoxidation, then add Ti iron, and control and add Ti content according to N content in steel, Ti/N ratio is controlled at 2.0-3.4.Utilize the proportioning that forms Ti/N=2.0～3.4 while smelting under the condition of high temperature, to generate tiny TiN particle, the stability of TiN even tiny TiN in guaranteeing steel plate in During Controlled Rolling thereafter, while controlling Plate Welding, crystal grain is thick, improves the welding property of steel plate.
Smelting steel process is by adding Ca to process, and nodularization inclusion morphology, has realized the smelting of Clean Steel, has purified steel.
Upper sheet billet continuous casting adopts dynamic soft reduction technology; Described slab reheats in operation, 1100 ℃～1200 ℃ of slab heating temperatures.For low-carbon (LC), add the compound pipe line steel of niobium titanium, reheat temperature and surpass 1200 ℃, can make to organize serious alligatoring, cause final microstructure coarsening, unfavorable to improving intensity and toughness, and Heating temperature is too high, waste resource and the energy;
In above-mentioned two-stage control rolling process, divide recrystallization zone controlled rolling and two stages of non-recrystallization district controlled rolling, recrystallization zone controlled rolling: start 1050 ℃ of rolling temperatures, stop 1000 ℃ of rolling temperatures, last percentage pass reduction >=20%, accumulative total draft is greater than 55%; Non-recrystallization district controlled rolling: start 850 ℃～950 ℃ of rolling temperatures, stop 730 ℃～850 ℃ of rolling temperatures, accumulative total draft is greater than 50%.
In the cooling control operation of above-mentioned multipath, adopt " air cooling+pre-straightening+MULPIC is cooling fast ", air cooling 20～60s, cooling rate is controlled at 1～3 ℃/s; MULPIC is cooling fast, and speed of cooling 15-35 ℃/s, 200～500 ℃ of cooling termination temperatures.Cooling rear steel plate stacking slow cooling, carries out self-tempering and removes internal stress.
In above-mentioned stacking slow cooling operation, steel plate is the stacking slow cooling that rolls off the production line fast after aligning, and the slow cooling time is 24 hours, and slow cooling starts 200 ℃ of temperature >.
The method is on the basis of Composition Design, by controlling slab heating temperature and heat-up time, adopt two-stage control rolling+multipath process for cooling, steel plate is carried out to the regulation and control of heterogeneous micro organization, obtain the hot-rolled steel sheet with good obdurability and property of resisting large deformation.
Of the present invention producing effect is: P content maximum value 0.010% in Composition Design in the present invention, S content maximum value 0.003%, steel is purer, high niobium Composition Design, comparatively outstanding to the grain refining of steel plate and intensity raising effect, make steel plate save Mo, adding of the noble metals such as Ni, cost is lower, energy-conserving and environment-protective, meet Materials direction, be easier to produce and promote, the yield strength 690-760MPa of steel plate of the present invention, tensile strength 870-920MPa, uniform elongation >=10%, yield tensile ratio≤0.78,-20 ℃ of Charpy-V impact power >=300J,-15 ℃ of drop weight tearing experiment shear area >=85%.
Accompanying drawing explanation
Fig. 1 is the HOP technique of JFE in background technology;
Fig. 2 is the microtexture picture of resistance to deformation X100 polyphase steel plate in embodiment 2;
Fig. 3 is the microtexture picture of resistance to deformation X100 polyphase steel plate in embodiment 3.
Embodiment
Below in conjunction with the drawings and specific embodiments, technical scheme of the present invention is described further, so that those skilled in the art can better understand the present invention, but does not therefore limit the present invention.
Steel plate preparation method of the present invention comprises technique: the operation such as proportioning is got the raw materials ready, molten iron KR desulfurization processing, converter smelting, CAS Argon, the refining of LF+RH duplex practice, sheet billet continuous casting, slab reheat, two-stage control rolling, pre-straightening, control multipath are cooling, aligning, stacking slow cooling, UT (Ultrasonic Testing).
Embodiment 1
The Composition Design of the resistance to deformation X100 Wide and Heavy Plates that this embodiment relates to is in Table 1:
Its preparation method design parameter is:
Molten steel sulfur content≤0.004%, converter smelting endpoint C≤0.04% after molten iron KR desulfurization is processed, P≤0.007%, CAS carries out after Al deoxidation, and [O] reaches 28ppm, and LF adds Nb, adds Ti, SiCa line to process, nodularization inclusion morphology in RH.
Smelting steel process of the present invention is controlled alloying element addition sequence: after converter, carry out deoxidation treatment, during deoxidation, AL add-on is abundant, and a deoxidation is abundant, in the LF later stage, add aluminum shot deoxidation, then add Ti iron, and control and add Ti content according to N content in steel, Ti/N ratio is controlled at 2.6.
Sheet billet continuous casting adopts dynamic soft reduction technology; Described slab reheats in operation, 1120 ℃ of slab heating temperatures.State in two-stage control rolling process, divide recrystallization zone controlled rolling and two stages of non-recrystallization district controlled rolling, recrystallization zone controlled rolling: start 1050 ℃ of rolling temperatures, stop 1000 ℃ of rolling temperatures, last percentage pass reduction >=20%, accumulative total draft is greater than 55%; Non-recrystallization district controlled rolling: start 880 ℃ of rolling temperatures, stop 760 ℃ of rolling temperatures, accumulative total draft is greater than 50%.
State in the cooling control operation of multipath, adopt " air cooling+pre-straightening+MULPIC is cooling fast ", air cooling 40s, cooling rate is controlled at 2 ℃/s; MULPIC is cooling fast, 20 ℃/s of speed of cooling, 240 ℃ of cooling termination temperatures.Cooling rear steel plate stacking slow cooling, carries out self-tempering and removes internal stress.
State in stacking slow cooling operation, steel plate is the stacking slow cooling that rolls off the production line fast after aligning, and the slow cooling time is 24 hours, and slow cooling starts 210 ℃ of temperature >.
Steel plate is carried out to Performance Detection, and detected result is in Table 2.
Embodiment 2
The Composition Design of the resistance to deformation X100 Wide and Heavy Plates that this embodiment relates to is in Table 1:
Its preparation method design parameter is:
Molten steel sulfur content≤0.004%, converter smelting endpoint C≤0.04% after molten iron KR desulfurization is processed, P≤0.007%, CAS carries out after Al deoxidation, and [O] reaches 30ppm, and LF adds Nb, adds Ti, SiCa line to process, nodularization inclusion morphology in RH.
Smelting steel process of the present invention is controlled alloying element addition sequence: after converter, carry out deoxidation treatment, during deoxidation, AL add-on is abundant, and a deoxidation is abundant, in the LF later stage, add aluminum shot deoxidation, then add Ti iron, and control and add Ti content according to N content in steel, Ti/N ratio is controlled at 2.8.
Sheet billet continuous casting adopts dynamic soft reduction technology; Described slab reheats in operation, 1140 ℃ of slab heating temperatures.State in two-stage control rolling process, divide recrystallization zone controlled rolling and two stages of non-recrystallization district controlled rolling, recrystallization zone controlled rolling: start 1050 ℃ of rolling temperatures, stop 1000 ℃ of rolling temperatures, last percentage pass reduction >=20%, accumulative total draft is greater than 55%; Non-recrystallization district controlled rolling: start 910 ℃ of rolling temperatures, stop 820 ℃ of rolling temperatures, accumulative total draft is greater than 50%.
State in the cooling control operation of multipath, adopt " air cooling+pre-straightening+MULPIC is cooling fast ", air cooling 40s, cooling rate is controlled at 2 ℃/s; MULPIC is cooling fast, 25 ℃/s of speed of cooling, 380 ℃ of cooling termination temperatures.Cooling rear steel plate stacking slow cooling, carries out self-tempering and removes internal stress.
State in stacking slow cooling operation, steel plate is the stacking slow cooling that rolls off the production line fast after aligning, and the slow cooling time is 24 hours, and slow cooling starts 240 ℃ of temperature >.
Steel plate is carried out to Performance Detection, and detected result is in Table 2.
Embodiment 3
The Composition Design of the resistance to deformation X100 Wide and Heavy Plates that this embodiment relates to is in Table 1:
Its preparation method design parameter is:
Molten steel sulfur content≤0.004%, converter smelting endpoint C≤0.04% after molten iron KR desulfurization is processed, P≤0.007%, CAS carries out after Al deoxidation, and [O] reaches 25ppm, and LF adds Nb, adds Ti, SiCa line to process, nodularization inclusion morphology in RH.
Smelting steel process of the present invention is controlled alloying element addition sequence: after converter, carry out deoxidation treatment, during deoxidation, AL add-on is abundant, and a deoxidation is abundant, in the LF later stage, add aluminum shot deoxidation, then add Ti iron, and control and add Ti content according to N content in steel, Ti/N ratio is controlled at 2.0.
Sheet billet continuous casting adopts dynamic soft reduction technology; Described slab reheats in operation, 1120 ℃ of slab heating temperatures.State in two-stage control rolling process, divide recrystallization zone controlled rolling and two stages of non-recrystallization district controlled rolling, recrystallization zone controlled rolling: start 1050 ℃ of rolling temperatures, stop 1000 ℃ of rolling temperatures, last percentage pass reduction >=20%, accumulative total draft is greater than 55%; Non-recrystallization district controlled rolling: start 900 ℃ of rolling temperatures, stop 800 ℃ of rolling temperatures, accumulative total draft is greater than 50%.
State in the cooling control operation of multipath, adopt " air cooling+pre-straightening+MULPIC is cooling fast ", air cooling 40s, cooling rate is controlled at 2 ℃/s; MULPIC is cooling fast, 25 ℃/s of speed of cooling, 250 ℃ of cooling termination temperatures.Cooling rear steel plate stacking slow cooling, carries out self-tempering and removes internal stress.
State in stacking slow cooling operation, steel plate is the stacking slow cooling that rolls off the production line fast after aligning, and the slow cooling time is 24 hours, and slow cooling starts 210 ℃ of temperature >.
Steel plate is carried out to Performance Detection, and detected result is in Table 2.
Resistance to deformation 100 polyphase steel plate chemical composition examples (wt%) for table 1 large diameter pipeline
The performance perameter of each embodiment light plate of table 2
Claims (8)
1. large diameter pipeline is out of shape a heterogeneous X100 High Strength Steel Plate with the Chinese People's Anti-Japanese Military and Political College, and it is comprised of component once by weight percentage: C:0.04～0.08%, Si:0.15～0.35%, Mn:1.60～2.00%, P≤0.008%, S≤0.003%, Nb:0.07～0.11%, Ti:0.015～0.025%, Mo≤0.25%, Cu≤0.35%, Ni≤0.030%, Cr≤0.030%, all the other are Fe and inevitable impurity.
2. a kind of large diameter pipeline according to claim 1 is out of shape heterogeneous X100 High Strength Steel Plate with the Chinese People's Anti-Japanese Military and Political College, it is characterized in that: the chemical composition of described steel plate meets Pcm=C+Si/30+Ni/60+ (Mn+Cr+Cu)/20+Mo/15+V/10+5B≤0.20%.
3. a kind of large diameter pipeline according to claim 1 is out of shape the manufacture method of heterogeneous X100 High Strength Steel Plate with the Chinese People's Anti-Japanese Military and Political College, the operation such as its processing step comprises that proportioning is got the raw materials ready, molten iron KR desulfurization processing, converter smelting, CAS Argon, the refining of LF+RH duplex practice, sheet billet continuous casting, slab reheat, two-stage control rolling, pre-straightening, control multipath are cooling, aligning, stacking slow cooling, UT (Ultrasonic Testing).
4. a kind of large diameter pipeline according to claim 4 is out of shape the manufacture method of heterogeneous X100 High Strength Steel Plate with the Chinese People's Anti-Japanese Military and Political College, it is characterized in that: rear molten steel sulfur content≤0.004%, converter smelting endpoint C≤0.04% are processed in described molten iron KR desulfurization, P≤0.007%, CAS carries out after Al deoxidation, [O] reaches 25-30ppm, LF adds Nb, adds Ti, SiCa line to process, nodularization inclusion morphology in RH.
5. the manufacture method that a kind of large diameter pipeline according to claim 4 is out of shape heterogeneous X100 High Strength Steel Plate with the Chinese People's Anti-Japanese Military and Political College, is characterized in that: sheet billet continuous casting adopts dynamic soft reduction technology; Described slab reheats in operation, 1100 ℃～1200 ℃ of slab heating temperatures.
6. a kind of large diameter pipeline according to claim 4 is out of shape the manufacture method of heterogeneous X100 High Strength Steel Plate with the Chinese People's Anti-Japanese Military and Political College, it is characterized in that: in described two-stage control rolling process, divide recrystallization zone controlled rolling and two stages of non-recrystallization district controlled rolling, recrystallization zone controlled rolling: start 1050 ℃ of rolling temperatures, stop 1000 ℃ of rolling temperatures, last percentage pass reduction >=20%, accumulative total draft is greater than 55%; Non-recrystallization district controlled rolling: start 850 ℃～950 ℃ of rolling temperatures, stop 730 ℃～850 ℃ of rolling temperatures, accumulative total draft is greater than 50%.
7. a kind of large diameter pipeline according to claim 4 is out of shape the manufacture method of heterogeneous X100 High Strength Steel Plate with the Chinese People's Anti-Japanese Military and Political College, it is characterized in that: in the cooling control operation of described multipath, adopt " air cooling+pre-straightening+MULPIC is cooling fast ", air cooling 20～60s, cooling rate is controlled at 1～3 ℃/s; MULPIC is cooling fast, and speed of cooling 15-35 ℃/s, 200～500 ℃ of cooling termination temperatures.
8. a kind of large diameter pipeline according to claim 4 is out of shape the manufacture method of heterogeneous X100 High Strength Steel Plate with the Chinese People's Anti-Japanese Military and Political College, it is characterized in that: in described stacking slow cooling operation, steel plate is the stacking slow cooling that rolls off the production line fast after aligning, the slow cooling time is 24 hours, and slow cooling starts 200 ℃ of temperature >.
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| CN104998901A (en) * | 2015-08-10 | 2015-10-28 | 首钢总公司 | Hot rolling technology for pipeline rolled steel plate |
| CN105200336A (en) * | 2015-10-16 | 2015-12-30 | 首钢总公司 | Strain design region based high-performance pipeline steel with high-deformation resistance and preparation method |
| CN105886924A (en) * | 2016-04-28 | 2016-08-24 | 山东钢铁股份有限公司 | Low-alloy steel high in strength and toughness performance and preparing method of low-alloy steel |
| CN109897928A (en) * | 2019-03-25 | 2019-06-18 | 江阴兴澄特种钢铁有限公司 | A kind of manufacturing method of the big thickness steel plate of the continuous casting billet production guarantee anti-lamellar tearing performance of core |
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| CN104532155A (en) * | 2014-12-19 | 2015-04-22 | 山东钢铁股份有限公司 | X90 level heterogeneous structure pipeline steel plate for longitudinal welded pipe and manufacturing method of pipeline steel plate |
| CN104532155B (en) * | 2014-12-19 | 2017-02-22 | 山东钢铁股份有限公司 | X90 level heterogeneous structure pipeline steel for longitudinal welded pipe |
| CN104998901A (en) * | 2015-08-10 | 2015-10-28 | 首钢总公司 | Hot rolling technology for pipeline rolled steel plate |
| CN105200336A (en) * | 2015-10-16 | 2015-12-30 | 首钢总公司 | Strain design region based high-performance pipeline steel with high-deformation resistance and preparation method |
| CN105886924A (en) * | 2016-04-28 | 2016-08-24 | 山东钢铁股份有限公司 | Low-alloy steel high in strength and toughness performance and preparing method of low-alloy steel |
| EP3778971A4 (en) * | 2018-04-09 | 2021-11-24 | Nippon Steel Corporation | Steel pipe and method for producing steel pipe |
| CN109897928A (en) * | 2019-03-25 | 2019-06-18 | 江阴兴澄特种钢铁有限公司 | A kind of manufacturing method of the big thickness steel plate of the continuous casting billet production guarantee anti-lamellar tearing performance of core |
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