CN106480381A - Hot-rolled wide and thick plate with good plastic toughness for low-temperature pipeline and manufacturing method thereof - Google Patents
Hot-rolled wide and thick plate with good plastic toughness for low-temperature pipeline and manufacturing method thereof Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 55
- 239000010959 steel Substances 0.000 claims abstract description 55
- 238000001816 cooling Methods 0.000 claims abstract description 24
- 238000005096 rolling process Methods 0.000 claims abstract description 20
- 238000009749 continuous casting Methods 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052802 copper Inorganic materials 0.000 claims abstract description 10
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 10
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 8
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 7
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 7
- 238000005266 casting Methods 0.000 claims abstract description 6
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 6
- 238000007670 refining Methods 0.000 claims abstract description 6
- 229910052742 iron Inorganic materials 0.000 claims abstract description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 5
- 238000003723 Smelting Methods 0.000 claims abstract description 4
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 3
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 3
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 3
- 238000010438 heat treatment Methods 0.000 claims description 17
- 239000000203 mixture Substances 0.000 claims description 13
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 230000001133 acceleration Effects 0.000 claims description 6
- 229910001568 polygonal ferrite Inorganic materials 0.000 claims description 6
- 238000002791 soaking Methods 0.000 claims description 6
- 238000010583 slow cooling Methods 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 229910000859 α-Fe Inorganic materials 0.000 claims description 3
- 229910001563 bainite Inorganic materials 0.000 claims description 2
- 239000000498 cooling water Substances 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 239000002994 raw material Substances 0.000 abstract description 2
- 238000003303 reheating Methods 0.000 abstract 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 14
- 239000010949 copper Substances 0.000 description 11
- 239000011572 manganese Substances 0.000 description 10
- 239000013078 crystal Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 239000010936 titanium Substances 0.000 description 7
- 229910001566 austenite Inorganic materials 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 239000010955 niobium Substances 0.000 description 6
- 238000010791 quenching Methods 0.000 description 6
- 230000000171 quenching effect Effects 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 238000005098 hot rolling Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 238000005728 strengthening Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000006104 solid solution Substances 0.000 description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
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- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
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- 230000008569 process Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
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- 230000009466 transformation Effects 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000002045 lasting effect Effects 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
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Abstract
The invention provides a hot-rolled wide and thick plate with good plastic toughness for a low-temperature pipeline and a manufacturing method thereof, wherein the steel plate comprises the following components in percentage by weight: c: 0.035-0.060%, Si: 0.20-0.35%, Mn: 1.56% -1.74%, Nb: 0.01-0.04%, Ti: 0.011% -0.025%, Cr: 0.18-0.30%, Ni: 0.06% -0.15%, Als: 0.015 to 0.040%, Cu: 0-0.10%, Mo: 0 to 0.19%, (Mo + Ni + Cu + Cr): 0.32-0.55%, N: 0.0020 to 0.0045 percent, less than or equal to 0.009 percent of P, less than or equal to 0.001 percent of S, less than or equal to 0.00015 percent of H, less than or equal to 0.0020 percent of O, Ti/N: 3.42-6.10, and the balance of iron and inevitable impurities; and CEIIWControl at 0.385% -0.430%, CEPcmThe content is controlled to be 0.159-0.175 percent. The manufacturing method comprises the steps of molten iron pretreatment, converter smelting, external refining, continuous casting, casting blank reheating, rolling and cooling, and the invention provides a method suitable for manufacturing large caliberAnd above) the raw material of the thick-wall low-temperature pipeline steel pipe has good plasticity and toughness.
Description
Technical field
The invention belongs to low-carbon low-alloy steel field, more particularly, to a kind of oil-gas transportation cryotronl
Line plasticity and the good hot rolling Wide and Heavy Plates of toughness and its manufacture method.
Background technology
Gradually withered with world oil, the lasting increase of gas consumption and original oil gas field
Exhaust, newly-built oil gas project constantly to outlying, awful weather regional development, such as Russia, Ah
It is exactly one of prior development direction that Lars such as adds at the extremely frigid zones.Due to extremely frigid zones pipeline military service bar
Part harshness is it is desirable to feed-line not only will reach corresponding intensity, and it is necessary to possesses good
Ductility and low-temperature flexibility；Meanwhile, in order to improve transfer efficiency, discharge pressure and pipeline opening
Footpath constantly increases, and maximum pipe diameter reachesMore than 1420mm, therefore, respective lines
Steel plate must be fulfilled for heavy wall (>=30mm), big plate width require (>4300mm).
Day by day harsh with application conditions, the technical requirements of low temp area Pipeline Steel Plate are also more
Strictly, its horizontal, longitudinal yield strength >=510MPa, transverse tensile strength 590-690MPa,
Endwise tensile strength 565-690MPa, yield tensile ratio≤0.90, ratio elongation percentage A (δ 5) >=20%,
V-notch Charpy-V impact power >=220J at -40 DEG C, DWTT DUCTILE SHEAR area at -20 DEG C
>=85%；This technical requirements is severe choosing for generous specification Pipeline Steel Plate
War.
At present, some researchs are had both at home and abroad to low temp area pipe line steel and generous specification pipe line steel,
It is found that partly relevant patent and document through retrieval.But its described content is with the present invention's
There is notable difference in the aspect such as technical scheme and described properties of product.
The Patents retrieving and document are as follows：
《The preparation method of K60 level low alloy Pipeline Steel Plate》(RU2465344C1) disclose
A kind of K60 Pipeline Steel Plate, (percentage by weight) C in its composition：0.07%～0.09%,
Mn：1.60%～1.70%, Ni：0.25%～0.35%, Cu：0.15%～0.20%, V：
0.04%-0.06%；Steel plate thickness is less than 27mm, and the precious alloy content such as Ni, Cu is more,
Do not ensure DWTT performance.
《A kind of heavy wall high DWTT performance X65-X70 submerged pipeline steel and manufacture method》
(CN103834874A) X65-X70 submerged pipeline composition of steel disclosed in is (percentage by weight)
C：0.03%～0.05%, Mn：1.47%～1.70%, Ni：0.36%～0.45%, Cu：
0.12%～0.20%, it is disadvantageous in that, equally add the alloying elements such as more Ni to ensure
Performance.
《A kind of pipe line steel of conveying natural gas of anticorrosion stress-resistant cracking and its manufacturing process》
(CN103981458A), Cr in disclosed pipeline composition of steel：0.68%～0.80%, Mo：
0.4%～3.8% and Mg to be added, elements such as w.
《A kind of K60 level pipe fitting hot-rolled thick plank and its production method》(CN103710619A),
A kind of open K60 level pipe fitting steel of knowing clearly, composition adopts C (0.11～0.17%), V (0.09
%～0.13%) etc. element utilize hardening and tempering process ensure steel plate final performance, in composition, production
Significantly different with the present invention in technique.
《The high-strength and high ductility Pipeline Steel Plate of low temperature resistant cracking and its manufacture method》
(JP2006307324A) it is proposed that think gauge Pipeline Steel Plate quenching degree being increased using B and adopting
The method being produced with hot rolling+Technology for Heating Processing, in composition design and production technology road warp
Significantly different with the present invention.
Document《The development of K60_2 grade of steel φ 1220mm × 22mm straight-line joint submerged arc welding tube》, literary composition
In mainly describe thickness 22mm, the K60 level steel pipe of bore φ 1220mm, thickness is little,
Narrow width, different from the present invention in specification；High C, high Ni is adopted to design on composition.
In sum, the prior art hot rolling width good to low temp area pipeline plasticity, toughness
The research of steel plate still has some deficits.
Content of the invention
It is an object of the invention to overcoming the problems referred to above and deficiency and providing one kind to be suitable to cryogenically
Area's oil gas pipeline thickness >=30mm, width>4300mm, yield strength rank
The good hot rolling Wide and Heavy Plates of the plasticity and toughness of 510MPa and its manufacture method.
The object of the present invention is achieved like this：
It is known that increasing with Pipeline Steel Plate thickness, crystal grain refinement and organizational controls are more tired
Difficulty, leads to plasticity and toughness to be decreased obviously；And the increase of steel plate width, rolling deformation drag with
Increase, rolling reduction is restricted, and is unfavorable for realizing crystal grain refinement, meanwhile, fast quickly cooling
But uniformity controlling is also increasingly difficult, therefore, generous specification Pipeline Steel Plate under constructed requirement
Manufacture difficulty apparently higher than thin narrow steel plate.
The cryogenic pipelines of the present invention thickness of the good hot rolled heavy plate of plasticity and toughness >=
30mm, width>4300mm；Based on low C, low Mn, emphasis utilizes composition design
The element such as Cr element portions or valuable Mo, Ni, Cu, the V of replacing whole, is equipped with high-quality
Continuous casting, low-temperature heat, the big pressure of rolling, the manufacturing process of uniformly acceleration cooling improve steel plate
Energy.
A kind of cryogenic pipelines good hot rolled heavy plate of plasticity and toughness, the composition of this steel plate is by weight
Percentages are as follows：C：0.035%～0.060%, Si：0.20%～0.35%, Mn：1.56
%～1.74%, Nb：0.01%～0.04%, Ti：0.011%～0.025%, Cr：0.18
%～0.30%, Ni：0.06%～0.15%, Als：0.015%～0.040%, Cu：0～0.10%,
Mo：0～0.19%, (Mo+Ni+Cu+Cr)：0.32%～0.55%, N：0.0020%～
0.0045%th, P≤0.009%, S≤0.001%, H≤0.00015%, O≤0.0020%, Ti/N：
3.42～6.10, balance of ferrum and inevitable impurity；And CEIIWControl 0.385%～
0.430%, CEPcmControl 0.159%～0.175%,
Wherein CEIIW=C+Mn/6+ (Cr+Mo+V+Nb+Ti)/5+ (Ni+Cu)/15；
CEPcm=C+Si/30+ (Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B.
Thickness >=the 30mm of described hot rolled heavy plate, width>4300mm, described hot rolling is generous
Plate microstructure is acicular ferrite+polygonal ferrite+bainite, and average grain size does not surpass
Cross 12 μm, wherein, polygonal ferrite percent by volume is 8%～35%.
Present component design reason is as follows：
C is most basic in steel, maximally effective intensified element, can form interstitial solid solution, also
Carbide can be formed with alloy element action, improve intensity, the structure of microstructure in impact steel
Become, therefore, carbon content is unsuitable too low；But, the increase of carbon content is unfavorable to toughness of material,
So, carbon content nor too high, it is considered herein that carbon controls 0.035%～0.060% relatively
For suitable.
Si has solution strengthening effect, improves quenching degree, reduces austenite phase field, but its content mistake
Height can make the plasticity of steel and toughness reduce, and easily causes cold short, its optimum range is 0.20%～0.35
%.
Mn can increase stabilization of austenite；There is solution strengthening effect, to raising quenching degree
Also favourable, but, the too high easy induction segregation of manganese content and be unfavorable for welding, it is considered herein that will
Manganese content controls more suitable 1.56%～1.74%.
Nb has obvious solution strengthening effect, can hinder crystalline substance with carbonitride form when separating out
Grain length is big, crystal grain thinning, and meanwhile, pinning dislocation plays invigoration effect.But, content of niobium mistake
Height can deteriorate welding performance, promotes weld crack to generate；Also production cost can be made substantially to increase,
It is considered herein that content of niobium is controlled more suitable 0.01%～0.04%.
Ti can play precipitation strength and nitrogen fixation effect, easily forms carbonitride, and fusing point is high,
Ti/N >=3.42 ensure that titanium nitride separates out, and effectively reduces and controls nomadic nitrogen amount of element；This
Invention think Ti content is controlled more suitable 0.011%～0.025%.
Cr has very strong solution strengthening effect, can make up the elements such as Mo, Ni, Cu and reduce
The loss of strength bringing, meanwhile, can improve stabilization of austenite and quenching degree, advise to improving thickness
Lattice armor plate strength plays good action with improving thickness direction structural homogenity, in addition, Cr contains
Amount reaches the corrosion resistance that can improve steel when more than 0.18%；Further, Cr can make A3,
A1 temperature raises, and is conducive to the control of microstructure；But Cr too high levels are unfavorable to weldability,
Plasticity also has degradating trend, so, Cr content controls and is advisable 0.18%～0.30%.
The effect improving intensity and improving plasticity toughness can be played when Ni content is more than 0.05%,
Prevent Cu crisp；Ni can postpone perlitic transformation, promote middle temperature transformation to organize the formation of, reduce
Thick steel plates cooling rate limits；But nickel price is higher, therefore, its content is controlled 0.06%～
0.15% is advisable.
The effective deoxidant element of Al, the too high field trash that can make in steel of aluminium content increases, welding
Penalty, therefore, the content of dissolved aluminum controls and is advisable 0.015%～0.040%.
Cu can play solution strengthening effect, can improve quenching degree；But the too high meeting of copper content
So that toughness is deteriorated, therefore, its content is controlled and is advisable below 0.10%.
Mo can significantly improve quenching degree, increases intensity, but, molybdenum content is too high to be increased
Cost, also adversely affects to weldability, therefore, should control its content below 0.19%.
The CE of the present inventionIIWControl in 0.385%～0.430%, CEPcmControl 0.159%～
0.175%, both can ensure that the obdurability of steel plate, steel plate can be made again to have suitable solderability.
A kind of cryogenic pipelines manufacture method of the good hot rolled heavy plate of plasticity and toughness, including molten iron
Pretreatment, converter smelting, external refining, continuous casting, strand heat, roll, cool down, its
It is characterised by：
(1) continuous casting：Before continuous casting after liquid steel refining, the Argon calmness time is no less than 10min, continuous casting billet
12～25 DEG C of the degree of superheat of cast, casting speed 0.81-1.1m/min, thickness of strand/finished steel
Plate thickness controls in 7.5-9.5；Argon before continuous casting is calm and the control to pouring temperature can promote
Enter inclusion removal, improve molten steel composition, temperature homogeneity, reduce slab quality defect；Suitable
Suitable casting speed advantageously reduces segregation, improves slab thickness center mass；From continuous casting billet to
The compression ratio of finished steel plate is crystal grain refinement and the important leverage of plate property.
(2) strand heats again：Continuous casting billet shove charge heating after cleaning, heating process is divided into 4
The individual stage, preheating section, bringing-up section 1 and 2, soaking zone, preheating section heating-up temperature 500-750
DEG C, 850～1050 DEG C of bringing-up section 1 heating-up temperature, bringing-up section 2 heating-up temperature 1090～1130
DEG C, 1080～1120 DEG C of soaking zone heating-up temperature, preheating section is not less than 40min heat time heating time,
Bringing-up section 1 and 2 sections heat time heating time 0.45～0.88min/mm, soaking zone heat time heating time
30-60min, heats total time 0.9～1.4min/mm；Continuous casting billet cleaning is effectively reduced surface
Defect, improves plate surface quality, and zone heating process is effectively reduced heating defect, improves
Heats and temperature homogeneity, can meet alloying element in blank using this heating technique and be in
Solid solution or part solid solution condition, simultaneously it is ensured that blank temperature uniformity, by austenite crystal chi
Very little control in effective range.
(3) roll：Roughing temperature is interval to be 960～1050 DEG C, using transverse and longitudinal rolling mode, slightly
Roll total deformation and be not less than 60%, every time deflection of rough rolling step is not less than 14%, wherein,
Axial rolling every time deflection of final 2 passages reaches 21%～27% and rolling temperature is less than 990
℃；Rough rolling step is equipped with big pass deformation using zerolling makes austenite recrystallization fully thin
Change crystal grain, avoiding the occurrence of mixed crystal causes performance loss again simultaneously；Middle temperature control plate blank thickness 2.8～
3.4t, t are finished steel plate thickness, and final rolling temperature is interval to be 760～840 DEG C it is ensured that having at least 1
Passes temperature is less than 790 DEG C；The finish rolling stage promotes austenite deformation and accumulates deformation energy,
Increase nucleation site.
(4) cool down：Roll rear steel plate and start 740～790 DEG C of cooling by water temperature, final cooling temperature 500～
570 DEG C, upper and lower cooling water inflow than 2.3-2.9, accelerate cooling can be divided into start to accelerate cooling and after
In continuous acceleration two stages of cooling, start the rate of cooling accelerating to be cooled in 650 DEG C of temperature ranges
10～15 DEG C/s, follow-up acceleration 6～10 DEG C/s of rate of cooling, stacking slow cooling afterwards, slow cooling cooling rate
0.3～0.9 DEG C/s.The final microstructure of steel plate is acicular ferrite+polygonal ferrite+bayesian
Body, wherein, 8%～35%, average grain size is or not polygonal ferrite percent by volume
More than 12 μm, steel plate is made to have suitable transverse and longitudinal intensity, good plasticity and low-temperature flexibility,
Meanwhile, weldability and mouldability are excellent, meet the requirement making large-caliber gas-oil conveyance conduit.
The beneficial effects of the present invention is：
(1) present invention, based on low C, low Mn, makes full use of Cr element portions or complete
Portion substitutes the elements such as valuable Mo, Ni, Cu, V, adds the element such as a small amount of Nb, Ti,
Strict control harmful element content, is equipped with the production technology of corresponding uniqueness, reduces life
Produce cost, obtain the generous specification steel plate of cryogenic pipelines of excellent combination property.
(2) carbon equivalent ce of the present inventionIIWAnd CEPcmSuitable it is ensured that material have good can
Weldering property.
(3) the continuous casting process scheme of the present invention effectively improves slab quality, thus improving
Finished product performance.
(4) low-temperature heat of the present invention, the big pressure of rolling, the manufacture method of uniformly acceleration cooling
Effectively refine steel plate crystal grain, wherein, final finished steel plate average grain size≤12 μm.
(5) the cryogenic pipelines of the present invention thickness of the good hot rolled heavy plate of plasticity and toughness >=
30mm, width>4300mm, horizontal and vertical yield strength can reach 510-590MPa, horizontal
Reach 620-670MPa to tensile strength, endwise tensile strength reaches 600-655MPa, transverse and longitudinal
To ratio elongation percentage A (δ 5) >=22%, transverse and longitudinal yield tensile ratio is less than 0.88, and -60 DEG C laterally
Ballistic work is not less than 420J, -20 DEG C of horizontal DWTT sections of shear be not less than 85% it is adaptable to
As manufacture heavy caliber (1420mm and more than) raw material of heavy wall cryogenic pipelines steel pipe.
Brief description
Fig. 1 is the micro-organization chart of the embodiment of the present invention 1.
Fig. 2 is the micro-organization chart of the embodiment of the present invention 2.
Specific embodiment
Below by embodiment, the present invention is further illustrated.
The embodiment of the present invention, according to the component proportion of technical scheme, carries out molten iron pretreatment, converter
Smelting, external refining, continuous casting, continuous casting billet heat, roll, cool down.The embodiment of the present invention
The composition of steel is shown in Table 1.The casting parameters of embodiment of the present invention steel are shown in Table 2.The present invention is real
The slab applying a steel heats technique number again and is shown in Table 3.The rolling mill practice number of embodiment of the present invention steel is shown in
Table 4.The cooling technique number of embodiment of the present invention steel is shown in Table 5.The synthesis of embodiment of the present invention steel
Performance is shown in Table 6.
The casting parameters of table 2 embodiment of the present invention steel
The slab heating technique parameter again of table 3 embodiment of the present invention steel
The rolling technological parameter of table 4 embodiment of the present invention steel
The cooling technique number of table 5 embodiment of the present invention steel
The combination property of table 6 embodiment of the present invention steel
Claims (3)
1. a kind of cryogenic pipelines with the good hot rolled heavy plate of plasticity and toughness it is characterised in that this steel plate
Composition is as follows by weight percentage：C：0.035%～0.060%, Si：0.20%～0.35
%, Mn：1.56%～1.74%, Nb：0.01%～0.04%, Ti：0.011%～0.025
%, Cr：0.18%～0.30%, Ni：0.06%～0.15%, Als：0.015%～0.040%,
Cu：0～0.10%, Mo：0～0.19%, (Mo+Ni+Cu+Cr)：0.32%～0.55%,
N：0.0020%～0.0045%, P≤0.009%, S≤0.001%, H≤0.00015%,
O≤0.0020%, Ti/N：3.42～6.10, balance of ferrum and inevitable impurity；And
CEIIWControl in 0.385%～0.430%, CEPcmControl 0.159%～0.175%,
Wherein CEIIW=C+Mn/6+ (Cr+Mo+V+Nb+Ti)/5+ (Ni+Cu)/15；
CEPcm=C+Si/30+ (Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B.
2. the cryogenic pipelines good hot rolled heavy plate of plasticity according to claim 1, its feature
It is, the thickness >=30mm of described hot rolled heavy plate, width>4300mm, hot rolled heavy plate
Microstructure is acicular ferrite+polygonal ferrite+bainite, and average grain size is less than
12 μm, wherein, polygonal ferrite percent by volume is 8%～35%.
3. the good hot rolled heavy plate of plasticity and toughness of the cryogenic pipelines described in a kind of claim 1 or 2
Manufacture method, adds including molten iron pretreatment, converter smelting, external refining, continuous casting, strand again
Heat, rolling, cooling it is characterised in that：
(1) continuous casting：Before continuous casting after liquid steel refining, the Argon calmness time is no less than 10min, continuous casting billet
12～25 DEG C of the degree of superheat of cast, casting speed 0.81-1.1m/min, thickness of strand/finished steel
Plate thickness controls in 7.5-9.5；
(2) strand heats again：Continuous casting billet shove charge heating after cleaning, heating process is divided into 4 ranks
Section, preheating section, bringing-up section 1 and 2, soaking zone, preheating section heating-up temperature 500-750 DEG C,
850～1050 DEG C of bringing-up section 1 heating-up temperature, 1090～1130 DEG C of bringing-up section 2 heating-up temperature,
1080～1120 DEG C of soaking zone heating-up temperature, preheating section is not less than 40min heat time heating time, heating
Section 1 and 2 section heat time heating time 0.45～0.88min/mm, soaking zone 30-60min heat time heating time,
Heating total time 0.9～1.4min/mm；
(3) roll：Roughing temperature is interval to be 960～1050 DEG C, using transverse and longitudinal rolling mode, slightly
Roll total deformation and be not less than 60%, every time deflection of rough rolling step is not less than 14%, wherein,
Axial rolling every time deflection of final 2 passages reaches 21%～27% and rolling temperature is less than 990
℃；Middle temperature control plate blank thickness 2.8～3.4t, t are finished steel plate thickness, and final rolling temperature interval is
760～840 DEG C it is ensured that there is at least 1 passes temperature to be less than 790 DEG C；
(4) cool down：Roll rear steel plate and start 740～790 DEG C of cooling by water temperature, final cooling temperature 500～
570 DEG C, upper and lower cooling water inflow than 2.3-2.9, accelerate cooling can be divided into start to accelerate cooling and after
In continuous acceleration two stages of cooling, start the rate of cooling accelerating to be cooled in 650 DEG C of temperature ranges
10～15 DEG C/s, follow-up acceleration 6～10 DEG C/s of rate of cooling, stacking slow cooling afterwards, slow cooling cooling rate
0.3～0.9 DEG C/s.
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| CN201510548151.5A CN106480381B (en) | 2015-08-31 | 2015-08-31 | Hot-rolled wide and thick plate with good plastic toughness for low-temperature pipeline and manufacturing method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003034838A (en) * | 2001-07-25 | 2003-02-07 | Nippon Steel Corp | Thick steel plate superior in fatigue strength |
| CN102851613A (en) * | 2011-06-28 | 2013-01-02 | 鞍钢股份有限公司 | Low-cost high-performance hot rolled steel plate for marine riser and production method thereof |
| CN103866203A (en) * | 2014-01-15 | 2014-06-18 | 扬州龙川钢管有限公司 | Seamless steel pipe for large-aperture high-strength bridge and TMCP production method thereof |
-
2015
- 2015-08-31 CN CN201510548151.5A patent/CN106480381B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003034838A (en) * | 2001-07-25 | 2003-02-07 | Nippon Steel Corp | Thick steel plate superior in fatigue strength |
| CN102851613A (en) * | 2011-06-28 | 2013-01-02 | 鞍钢股份有限公司 | Low-cost high-performance hot rolled steel plate for marine riser and production method thereof |
| CN103866203A (en) * | 2014-01-15 | 2014-06-18 | 扬州龙川钢管有限公司 | Seamless steel pipe for large-aperture high-strength bridge and TMCP production method thereof |
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