CN109825661A - A kind of technique of heavy reduction rolling production steel plate of pressure vessel - Google Patents
A kind of technique of heavy reduction rolling production steel plate of pressure vessel Download PDFInfo
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Abstract
A kind of technique of heavy reduction rolling production steel plate of pressure vessel, after smelting, refining, continuous casting, heavy reduction rolling, cooling, heat treatment, steel plate thickness 25-40mm, the heterogeneous microstructure of steel plate of pressure vessel with volume basis is the ferrite of 77-85%, the martensite of the tempering bainite of the pearlite of 10-15%, 4-8%, 3-6%, yield strength is 600-700MPa, tensile strength is 780-850MPa, steel plate yield tensile ratio is 0.78~0.82, elongation is 20-30%, -40 DEG C of horizontal V-shape impact absorbing energy > 150J.
Description
Technical field
The invention belongs to steel material technical field, in particular to a kind of heavy reduction rolling steel plate of pressure vessel and its life
Production. art.
Background technique
With industrialized continuous development, pressure vessel using more and more common.For example pressure vessel and equipment is petroleum
In Chemical Manufacture, the important equipment of harmful influence storage, pressure vessel material has decision to the running stability and economy of equipment
Property effect.Unfavorable material selection, can both bring unnecessary expenditure to chemical company, also easily bring peace to equipment operation
Full hidden danger, to cause safety accident.In addition different specific application environment also has larger area to the performance requirement of tank plate
Not.Therefore, whether equipment selection is proper extremely important to design of pressure vessels.
Controlled rolling and controlled cooling includes two-stage control rolling and accelerates to cool down.First stage is in recrystallization zone rolling deformation, deformation
The dislocation added up in austenite becomes recrystallization driving force, and austenite grain recrystallizes, and has refined crystal grain.Second stage exists
Unhydrated cement rolling deformation has added up a large amount of dislocation density in austenite, has provided for the phase transformation in continuous cooling process
Nuclear driving force and nucleation site.By accelerated cooling device after rolling, overcooling austenite is undergone phase transition, can be formed ferrite,
One or more heterogeneous structures such as pearlite, acicular ferrite, bainite and martensite, so that obtaining has different mechanical properties
Steel plate.The Optimum Matching of acquisition component system and technological parameter is the core technology of the high tough slab of TMCP production.Difference is closed
Gold element has very big difference to the austenite recrystallization of steel, the influence of different type phase transformation, causes final microstructure and mechanical property
Have significantly different.The steel that fracture toughness is excellent under ultralow temperature are obtained while improving steel strength, need reasonable utilization
Microalloying TMCP technology, emphasis obtain steel ideal by microalloying design and rolling mill practice adjustment refinement crystal grain
Tissue morphology, and then obtain high-strength and high ductility performance.
Summary of the invention
Technical problem solved by the invention is to provide a kind of technique of heavy reduction rolling production steel plate of pressure vessel, energy
Enough production has high intensity, high tenacity, low-temperature impact toughness, excellent weldability, corrosion resistance.To achieve the above object, originally
On the one hand invention needs to control the ingredient of steel plate of pressure vessel, on the other hand need to control the production method of steel plate of pressure vessel.
Technical solution is as follows:
A kind of technique of heavy reduction rolling production steel plate of pressure vessel, it is characterised in that: process route includes: through smelting
Refining, RH refining, continuous casting, heavy reduction rolling, cooling, heat treatment；Steel plate thickness 25-40mm, wherein heavy reduction roughing open rolling
Temperature is 1080-1110 DEG C, single pass reduction ratio > 18%, and final reduction rate >=25%, roughing carries out 3-5 passage, into
Row recrystallization, fining austenite grains, 950-980 DEG C of roughing end temp；880-900 DEG C of finish rolling start rolling temperature, finishing temperature
It is 750-780 DEG C, adds up reduction ratio 70-80%, finish rolling carries out 6-8 passage, forms high density dislocation during the rolling process.
A kind of technique of heavy reduction rolling production steel plate of pressure vessel, it is characterised in that: process route includes: through smelting
Refining, RH refining, continuous casting, heavy reduction rolling, cooling, heat treatment；Steel plate thickness 25-40mm, wherein heavy reduction roughing open rolling
Temperature is 1080-1110 DEG C, single pass reduction ratio > 18%, and final reduction rate >=25%, roughing carries out 3-5 passage, into
Row recrystallization, fining austenite grains, 950-980 DEG C of roughing end temp；880-900 DEG C of finish rolling start rolling temperature, finishing temperature
It is 750-780 DEG C, adds up reduction ratio 70-80%, finish rolling carries out 6-8 passage, forms high density dislocation during the rolling process；
The heterogeneous microstructure of final pressure tank plate with volume basis is the ferrite of 77-85%, the pearl of 10-15%
Body of light, the tempering bainite of 4-8%, 3-6% martensite, yield strength 600-700MPa, tensile strength 780-
850MPa, steel plate yield tensile ratio is 0.78~0.82, elongation 20-30%, -40 DEG C of horizontal V-shape impact absorbing energy >
150J。
A kind of technique of heavy reduction rolling production steel plate of pressure vessel, it is characterised in that: process route includes: through smelting
Refining, RH refining, continuous casting, heavy reduction rolling, cooling, heat treatment；Specific step is as follows:
(1) KR molten iron pre-processes de- S, and controls S≤0.005% in molten iron, carries out top and bottom combined blown converter smelting, iron later
The mass ratio of water and steel scrap is 8: 1, and first plus steel scrap, rear hot metal charging, converter terminal basicity are 4.0-4.2；Tapping temperature is 1600-
1620℃；Using floating plug, the double slag-stopping tappings of scum rod；
(2) it carries out RH refining: being vacuumized under the conditions of not oxygen blown and carry out nature decarburization, promote Ar flow 800-850NL/
Min carries out Dehydrogenation of Molten Steel, guarantees depth vacuum processing time >=12min, the Al-Mg-Mn complex deoxidization of 0.01-0.03kg/t is added
Agent removes oxygen extra in molten steel, then carries out alloying to molten steel, carries out soft blow, soft blow argon flow control to molten steel before bull ladle
In 50-60L/min, the top of the slag is not blown open system, guarantees molten steel soft blow time 10-12min；5-8min is stood after soft blow；
(3) continuous casting process: whole blowing argon avoids molten steel oxidation, controls continuous casting process nitrogen pick-up；The covering agent in
Avoid molten steel exposed, secondary cooling water matches aqueous mode according to low-carbon alloy steel, selects low-carbon alloy covering slag；Secondary cooling area for continuous casting is using electricity
Magnetic stirs+weighs press function, electromagnetic agitation electric current 300-320A, frequency 8-15Hz, drafts 30-35mm under weight；Tundish
15-25 DEG C of the degree of superheat, the slab thickness of crystallizer is 100-200mm out；
(4) heating and heavy reduction rolling；Steel billet threading heating furnace, 1180-1185 DEG C of heating temperature, heating time 100-
110min, the out laggard horizontal high voltage water de-scaling of heating furnace, pressure 20-25Mpa, heavy reduction roughing start rolling temperature are 1080-
1110 DEG C, single pass reduction ratio > 18%, final reduction rate >=25%, roughing carries out 3-5 passage, is recrystallized, carefully
Change austenite grain, 950-980 DEG C of roughing end temp；880-900 DEG C of finish rolling start rolling temperature, finishing temperature are 750-780 DEG C,
Accumulative reduction ratio 70-80%, finish rolling carry out 6-8 passage, form high density dislocation during the rolling process；
(5) cooling；Temperature control is begun to cool at 730-780 DEG C, steel plate enters section cooling region, with 25-30 DEG C/s
Cooling velocity be cooled to 330-350 DEG C；
(6) normalizing is carried out, controls normalizing temperature at 880 DEG C~920 DEG C, normalizing soaking time is in 50~60min；
(7) it is tempered, controls tempering temperature at 660~680 DEG C, tempering insulation time is in 50~60min；
Final pressure tank plate ingredient is C:0.12-0.13%, Si:0.3-0.4%, Mn by percentage to the quality:
1.50-1.60%, P :≤0.010%, S :≤0.002%, Nb:0.03-0.04%, Ti:0.02-0.03%, Al:0.5-
0.8%, Cr:0.4-0.6%, Cu:0.25-0.35%, Ni:1.1-1.2%, Mo:0.25-0.35%, Sb:0.05-0.1%,
N:0.002-0.0035%, Mg:0.001-0.003%, Ca:0.001-0.005%, B:0.001-0.003%, rare earth
La0.001-0.005%, Ti/N between 7-10, Nb/Ti between 1.2-1.6, remaining be Fe and inevitable impurity；Steel
Plate thickness 25-40mm,
The heterogeneous microstructure of final pressure tank plate with volume basis is the ferrite of 77-85%, the pearl of 10-15%
Body of light, the tempering bainite of 4-8%, 3-6% martensite, yield strength 600-700MPa, tensile strength 780-
850MPa, steel plate yield tensile ratio is 0.78~0.82, elongation 20-30%, -40 DEG C of horizontal V-shape impact absorbing energy >
150J。
The technique of heavy reduction rolling production steel plate of pressure vessel described above, it is characterised in that: final pressure container steel
Plate ingredient is C:0.12%, Si:0.3%, Mn:1.50%, P by percentage to the quality :≤0.010%, S :≤0.002%, Nb:
0.03%, Ti:0.022%, Al:0.5%, Cr:0.6%, Cu:0.35%, Ni 1.2%, Mo:0.35%, Sb:0.1%, N:
0.0025%, Mg:0.001%, Ca:0.003%, B:0.001%, rare earth La 0.003%, Ti/N are between 7-10, Nb/Ti
Between 1.2-1.6, remaining is Fe and inevitable impurity.
The technique of heavy reduction rolling production steel plate of pressure vessel described above, it is characterised in that: final pressure container steel
Plate ingredient is C:0.13%, Si:0.4%, Mn:1.60%, P by percentage to the quality :≤0.010%, S :≤0.002%, Nb:
0.04%, Ti:0.03%, Al:0.6%, Cr:0.55%, Cu:0.3%, Ni:1.15%, Mo:0.3%, Sb:0.05%, N:
0.003%, Mg:0.003%, Ca:0.005%, B:0.003%, rare earth La 0.005%, Ti/N between 7-10, Nb/Ti exists
Between 1.2-1.6, remaining is Fe and inevitable impurity.
The technique of heavy reduction rolling production steel plate of pressure vessel described above, it is characterised in that: steel billet puts into heating furnace,
1180-1185 DEG C of heating temperature, heating time 100-110min, the laggard horizontal high voltage water de-scaling of heating furnace out, pressure 20-
25Mpa, heavy reduction roughing start rolling temperature be 1080 DEG C, single pass reduction ratio 20%, final reduction rate >=25%, roughing into
4 passages of row, are recrystallized, fining austenite grains, and 950 DEG C of roughing end temp；880 DEG C of finish rolling start rolling temperature, finish to gauge
Temperature is 750 DEG C, adds up reduction ratio 70-80%, and finish rolling carries out 8 passages, forms high density dislocation during the rolling process.
The technique of heavy reduction rolling production steel plate of pressure vessel described above, it is characterised in that: steel billet puts into heating furnace,
1180-1185 DEG C of heating temperature, heating time 100-110min, the laggard horizontal high voltage water de-scaling of heating furnace out, pressure 20-
25Mpa, heavy reduction roughing start rolling temperature be 1110 DEG C, single pass reduction ratio 19%, final reduction rate >=28%, roughing into
4 passages of row, are recrystallized, fining austenite grains, and 980 DEG C of roughing end temp；900 DEG C of finish rolling start rolling temperature, finish to gauge
Temperature is 780 DEG C, adds up reduction ratio 70-80%, and finish rolling carries out 7 passages, forms high density dislocation during the rolling process.
Mill speed has important influence, rough rolling process to the tissue and performance of steel plate center portion in big pressure rolling mill practice
Middle rolling rate is lower, and Recovery and recrystallization is more complete, and the crystal grain of steel plate center portion is more tiny.The examination of mill speed height (2.0m/s)
It is poor to test structural homogenity in steel plate thickness direction, and the steel plate of mill speed low (1.7m/s) is due to roll-force in deformation process
Center portion is penetrated into, thus structural homogenity is good, if speed is too low, is just unable to ensure the production technology of continuous rolling, at this time
Corresponding technical effect also achieves saturation.So what the present invention took is technique that mill speed gradually decreases.
Casting technique of the invention recommends to use continuous casting process, and continuous casting process priority control cast temperature is original to refine
As-cast structure.For control continuous casting billet center Mn segregation, using electromagnetic agitation technique, specifically secondary cooling area for continuous casting uses electromagnetic agitation
+ weight press function, electromagnetic agitation electric current 300-320A, frequency 8-15Hz, drafts 30-35mm under weight；The tundish degree of superheat
15-25 DEG C, the slab thickness of crystallizer is 100-200mm out.Product steel plate thickness 25-40mm,
Then, illustrate the restriction reason of chemical component of the invention.Herein, mean quality % about the % of ingredient.
C is most basic intensified element.C, which is dissolved in steel, can form interstitial solid solution, to play the work of solution strengthening
With.C can also generate Carbide Precipitation in conjunction with the formation element of strong carbide, play the role of precipitation strength.With this
Meanwhile C can also improve the harden ability of steel.But, for the present invention, ductility, tough of the too high C of content for steel plate
Property, crack arrest characteristic and welding performance can have an adverse effect.That is C is very big on the influence of the intensity of steel, low-temperature flexibility and weldability,
From the low-temperature flexibility and weldability angle for improving steel, it is desirable to which C content controls lower in steel；But from the intensity and life of steel
Microstructures Control angle in manufacturing process is produced, C content is unsuitable too low, and too low C content (< 0.030%) will cause austenite
Crystal boundary migration rate is excessively high, brings very big difficulty to crystal grain refinement, mixed grain structure easy to form, cause steel low-temperature flexibility lowly and
Ultra-large linear energy input Low Temperature Impact Toughness of Heat-affected Zone serious deterioration, therefore C content lower control limit not preferably less than 0.12% in steel.When
When C content improves, although being conducive to the refinement of steel plate of pressure vessel microstructure, the weldability of steel plate is damaged, especially super
Under the conditions of Large Heat Input Welding；Since heat affected area (HAZ) crystal grain is seriously roughened and cooling in Thermal Cycle cooling procedure
Speed is very.Therefore, the content of the C element in ultra low temperature steel plate of the present invention must control between 0.12-0.13%.
Si adds Si as reducing agent and deoxidier in steelmaking process, can eliminate FeO and be mingled with adverse effect to steel.
Si is present in ferrite or austenite with being dissolved state, and the hardness and strength of ferrite or austenite can be improved.It can be improved
The corrosion resistance of these alloys makes them have the performances such as seawater corrosion resistance.Reduce austenite phase field.But with the increasing of silicone content
Add, the welding performance of steel can be reduced.Si promotes deoxidation of molten steel and can be improved armor plate strength, but uses the molten steel of Al deoxidation,
The deoxidation of Si is little, and although Si can be improved the intensity of steel plate, but Si seriously damages the low-temperature flexibility and welding of steel plate
Property, especially under ultra-large linear energy input welding condition, therefore the Si content of steel of the present invention is designed as Si:0.3-0.4%.
Mn is important Strengthening and Toughening element, and with the increase of Mn content, the intensity of steel is obviously increased, containing 1% Mn about
Tensile strength 100MPa can be improved, meanwhile, Mn slightly improves the effect of the atmospheric corrosion resistance of steel, but Mn element is easy in steel
Middle segregation.Also have expand austenite phase field, reduce Ar3 point temperature, fining ferrite grains and improve steel plate low-temperature flexibility
Effect, the effect for promoting bainite to be formed and improving armor plate strength；Mn is easy to happen segregation during molten steel is solid, especially excessively high
Mn content (as Mn content > 1.60%), not only result in continuous casting operation difficulty, and be easy to occur with the elements such as C, P, S
Segregation phenomena, aggravate continuous casting billet center segregation with it is loose, serious continuous casting billet center segregation is in subsequent controlled rolling and welds
Abnormal structure is easily formed in journey；Meanwhile Mn too high levels also will form coarse MnS particle, this coarse MnS particle is in warm
Along rolling to extension during rolling, severe exacerbation base material steel plate, welding heat affected zone impact flexibility, cause Z-direction degraded performance, anti-
Lamellar tearing performance is poor；In addition, the hardenability of steel can also be improved, improve welding cold crack sensitivity coefficient in steel by crossing high Mn content
(Pcm), the welding usability of steel is influenced.Therefore, Mn content is set as Mn:1.50-1.60% in steel.
P has huge damage as the mechanical performance being mingled with to steel harmful in steel, especially low-temperature impact toughness and weldability
Evil effect, the lower theoretically require the better, but consider operability and cost of steelmaking, for require can large-line energy weld
It connects, the thick steel plate of -60 DEG C toughness, P content needs to control≤0.010%.
S as in steel it is harmful be mingled with there is very big detrimental effect to the low-temperature flexibility of steel, it is often more important that S in steel with
Mn is combined, and forms MnS field trash, and in the hot rolling, the plasticity of MnS makes MnS along rolling to extension, and formation edge is rolled to press from both sides to MnS
Sundries band, serious transverse impact toughness, Z-direction performance and the weldability for damaging steel plate, while being generated in S or course of hot rolling hot-short
The essential element of property.The lower theoretically require the better, but in view of making steel operability, steel-making cost and the smooth principle of logistics,
For require -60 DEG C of toughness, can ultra-large linear energy input welding thick steel plate, S content need control≤0.002%.
Nb: the purpose of micro Nb element is added in steel is to carry out non-recrystallization to go controlled rolling, when Nb additive amount is lower than 0.03%
When, effective controlled rolling effect cannot be played；Upper shellfish is induced when Nb additive amount is more than 0.04%, under ultra-large linear energy input welding condition
Family name's body is formed, the serious low-temperature flexibility for damaging ultra-large linear energy input welding heat affected zone, meanwhile, the metal member of Nb or a kind of valuableness
Element, adding more Nb also can correspondingly increase manufacturing cost.Therefore the control of Nb content obtains between 0.03-0.04%
While obtaining optimal controlled rolling effect, and the toughness of ultra-large linear energy input welded thin-wall box component is not damaged.
The purpose of micro Ti is added in steel is to generate the very high TiN particle of stability in conjunction with N in steel, inhibits welded thin-wall box component
Area's Austenite Grain Growth and change second-order phase transition product, improve the weldability of steel and the low-temperature flexibility of HAZ.The Ti added in steel
Content will be matched with the N content in steel, and matched principle is that TiN cannot be precipitated in liquid molten steel and must analyse in solid phase
Out；Therefore the Precipitation Temperature of TiN must assure that lower than 1400 DEG C, and when being added, Ti content is very few, form TiN number of particles deficiency,
It is not enough to inhibit the Austenite Grain Growth of HAZ and changes second-order phase transition product and improve the low-temperature flexibility of HAZ；Ti content is added
When excessive, TiN Precipitation Temperature is more than 1400 DEG C, and large scale TiN particle will be precipitated in crystallizer solidification stages in molten steel, this
Large scale TiN particle cannot inhibit the Austenite Grain Growth of HAZ, become the starting point of crack initiation instead；Therefore Ti content
Optimum controling range be Ti:0.02-0.03%.
Al is that the element in steel is added for deoxidation.After deoxidation is complete, Al reduces the content of the O in steel plate, with
Improve the aging performance of steel plate.In addition, adding suitable Al also helps refinement crystal grain, so as to improve the toughness and tenacity of steel.
The present invention is adjusted Al content, and the Al content (usually≤0.1%) of significantly larger than general steel plate is mainly considered
The special-purpose of steel plate of pressure vessel, for example, bear hot environment region when, Al is as the high temperature for making steel by solution strengthening
Intensity increases, improves fatigue at high temperature characteristic.Therefore Al:0.5-0.8%.
Cr is one of the important element of harden ability for improving steel plate.The uniformity of corrosion, inhibition office can be improved in Cr element
Portion's corrosion.For the steel plate of think gauge, need to improve the harden ability of steel plate usually by adding more Cr member to make up
Thickness bring loss of strength while improving armor plate strength, and improves the uniformity of the performance of steel plate in a thickness direction.
Cr can also inhibit the transformation of pro-eutectoid ferrite and pearlite, help to obtain acicular ferrite structure.Once too high levels
Cr and Mn simultaneously be added in steel plate, will lead to the formation of the Cr-Mn composite oxides of low melting point, such that steel plate exists
Form face crack in hot procedure, and can also severe exacerbation steel plate welding performance.For this purpose, technical solution of the present invention
In the content of Cr should be limited to Cr:0.4-0.6%.
Cu can suitably improve the harden ability of steel plate, and Cu can also improve the weather-resistance of steel plate.So
And the Cu element that too high levels are added into steel can deteriorate the welding performance of steel plate；Specifically, Cu in steel in the form of CuO
It is enriched in interior rusty scale, corrosive media can be isolated well, mitigate chloride ion to the facilitation of corrosion, and increase the polarization of steel
Resistance causes the protectiveness of rusty scale to enhance, to improve the sea atmosphere corrosion performance of steel.Moreover, with the increasing of Cu content
Add, the anti-corrosion of steel gradually increases, but works as the limitation of solubility of the Cu in Fe, can generate slab in continuous casting and the operation of rolling and split
The defects of line, liquation, so controlling the content of the Cu element in steel plate of the present invention for 0.25-0.35%.
Ni is the element for improving the low-temperature flexibility of material.Suitable Ni, which is added, can reduce the stacking fault energy of crystal, be conducive to
The sliding motion of dislocation improves the impact flexibility of material, more particularly to improve the impact flexibility in special heavy plate centre.Ni may be used also
To promote the harden ability effect of Mo.But, if Ni content is too high, steel slab surface is easy to generate the higher iron oxide of stickiness
Skin is difficult to remove during postorder processing and manufacturing, to influence the surface quality and fatigue behaviour of steel plate.In addition, working as Ni
When content is too high, it is unfavorable for the welding performance of super-thick steel plate.Therefore, the Ni content in steel plate of the present invention, which needs to control, is
Ni:1.1-1.2%.
Mo is the element for improving the harden ability of steel plate, and effect is only second to Mn element.The equal of corrosion can be improved in Mo element
Even property inhibits local corrosion.Mo can not only effectively improve the intensity of steel plate, additionally it is possible to inhibit pro-eutectoid ferrite and pearly-lustre
The transformation of body obtains acicular ferrite structure to facilitate steel plate.But with the increase of Mo content, the yield strength of steel plate
It is gradually increased, and the plasticity of steel plate can gradually decrease.For the steel plate with high crack arrest characteristic of the invention, therefore
Mo:0.25-0.35%.
Resistance to general corrosion performance of the dry and wet repeatedly under environment can be improved in Sb element, and improves acid-resistant corrosion.The present invention
Its content is respectively selected as Sb:0.05-0.1%.
The control range of N and the control range of Ti are corresponding, for steel plate of pressure vessel, need in view of ultra-large linear energy input
Performance when welding, Ti/N are best between 7-10.N content is too low, and generation TiN number of particles is few, size is big, cannot play
Improve the effect of the weldability of steel, instead to weldability nocuousness；But N content it is excessively high when, freely [N] increases in steel, especially super
Heat affected area (HAZ) free [N] content sharply increases under the conditions of Large Heat Input Welding, serious to damage HAZ low-temperature flexibility, deteriorates steel
Weldability.Therefore N:0.002-0.0035%.
The MgO that fine dispersoid distribution can be generated in addition Mg is mingled with, and more situations is and Ti collective effect, formation MgO+
Ti2O3 oxide is easy that MnS is precipitated in the oxide surface, to promote the generation of intragranular acicular ferrite, improves sweating heat
The toughness of the zone of influence.Mg content in steel is 0.001-0.003%.
To steel carry out Ca processing, on the one hand can further pure molten steel, on the other hand sulfide in steel is denaturalized
Processing, be allowed to become non-deformable, stablize tiny spherical sulfide, the red brittleness that inhibits S, the low-temperature flexibility for improving steel and
Z-direction performance, the anisotropy for improving steel plate toughness.Ca additional amount is too low, and sulfide modified treatment effect is little；Ca additional amount mistake
Height, formation Ca (O, S) is oversized, and brittleness also increases, and can become fracture crack starting point, reduce the low-temperature flexibility of steel, simultaneously
Also reduce purity of steel, pollution molten steel.Therefore Ca:0.001-0.005%.
B strong inhibition pro-eutectoid ferrite is formed, and promotes the formation of the low temperature phase changes tissues such as bainite, therefore be dissolved B pairs
It is most important in the intensity for obtaining the low temperature phase changes tissues such as bainite and improving steel plate.B can also improve Large Heat Input Welding
The low-temperature flexibility of heat affected area HAZ, therefore B:0.001-0.003%.
It is the element modified to non-metallic inclusion that RE, which is common, while can also refine crystal grain, improves the pinning of oxide
Effect or resistance to lamellar tearing improve intensity and toughness.But it even if adds less than 0.001%, also without the effect；Addition
When more than 0.005%, cost be will increase.The rare earth that this technology is selected is La 0.001-0.005%.
Compared with prior art, the technology of the present invention effect includes:
1, the present invention is by precisely control product ingredient, production technology, guarantee tissue slab in the uniformity of mechanical property,
And list rolling pass reduction system.There is good welding while with high intensity, high tenacity, high welding performance
Property.
2, it in the present invention, by the accurate control to alloying element, avoids and exchanges performance for increase alloy quantity
It improves, has saved process costs, improved production efficiency.
3, the present invention is by reasonable Design of Chemical Composition, and takes cooling controlling and rolling controlling process, final pressure tank plate
Heterogeneous microstructure with volume basis is the ferrite of 77-85%, tempering bainite, the 3- of the pearlite of 10-15%, 4-8%
6% martensite, yield strength 600-700MPa, tensile strength 780-850MPa, steel plate yield tensile ratio 0.78~0.82,
Elongation is 20-30%, -40 DEG C of horizontal V-shape impact absorbing energy > 150J.This is than some common pressure vessel Steel Properties
It is excellent, tissue is accurately controlled, performance is stablized.
4, cooling velocity of the invention increases than existing same type steel grade, and purpose is still specific in order to obtain this
The comprehensive performance that the microstructure of type and its behind are implied.Such as the think gauge pressure vessel in CN102002635A
With steel and preparation method thereof, roughing overall compression ratio > 50%, trimmed size 60-70mm, workpiece thickness 130mm, finished product rule
Lattice 70-80mm, workpiece thickness 140mm, 840-900 DEG C of finish rolling start rolling temperature, final cooling temperature are 650-700 DEG C, cooling speed
Degree is 5-12 DEG C/s, but tensile strength about 600MPa；For another example the 610MPa grade high strength pressure vessels in CN101358319A are used
The production method of steel plate, roller repairing technique: 15-25 DEG C of cooling velocity/s, cold 600~650 DEG C eventually；600-700 is carried out after rolling
DEG C tempering, obtain tempering bainite and tempered sorbite line and staff control；Tissue and the different sample of the present invention, final performance with
There is also very big gaps by the present invention.Cooling in also such as CN101497961A terminates cooling temperature≤300 DEG C；Heat treatment, quenches
850 DEG C~950 DEG C of fiery temperature, 550 DEG C~660 DEG C of tempering temperature, metallographic structure target: bainite type acicular ferrite structure,
There is also very big gaps by final performance and the present invention.
Specific embodiment
It elaborates below with reference to example embodiment to technical solution of the present invention.However, example embodiment can
Implement in a variety of forms, and is not understood as limited to embodiment set forth herein；On the contrary, thesing embodiments are provided so that
The design of example embodiment more comprehensively and completely, and is comprehensively communicated to those skilled in the art by the present invention.
Embodiment 1
A kind of technique of heavy reduction rolling production steel plate of pressure vessel, it is characterised in that: process route includes: through smelting
Refining, RH refining, continuous casting, heavy reduction rolling, cooling, heat treatment；Specific step is as follows:
(1) KR molten iron pre-processes de- S, and controls S≤0.005% in molten iron, carries out top and bottom combined blown converter smelting, iron later
The mass ratio of water and steel scrap is 8: 1, and first plus steel scrap, rear hot metal charging, converter terminal basicity are 4.0-4.2；Tapping temperature is 1600-
1620℃；Using floating plug, the double slag-stopping tappings of scum rod；
(2) it carries out RH refining: being vacuumized under the conditions of not oxygen blown and carry out nature decarburization, promote Ar flow 800-850NL/
Min carries out Dehydrogenation of Molten Steel, guarantees depth vacuum processing time >=12min, the Al-Mg-Mn complex deoxidization of 0.01-0.03kg/t is added
Agent removes oxygen extra in molten steel, then carries out alloying to molten steel, carries out soft blow, soft blow argon flow control to molten steel before bull ladle
In 50-60L/min, the top of the slag is not blown open system, guarantees molten steel soft blow time 10-12min；5-8min is stood after soft blow；
(3) continuous casting process: whole blowing argon avoids molten steel oxidation, controls continuous casting process nitrogen pick-up；The covering agent in
Avoid molten steel exposed, secondary cooling water matches aqueous mode according to low-carbon alloy steel, selects low-carbon alloy covering slag；Secondary cooling area for continuous casting is using electricity
Magnetic stirs+weighs press function, electromagnetic agitation electric current 300-320A, frequency 8-15Hz, drafts 30-35mm under weight；Tundish
15-25 DEG C of the degree of superheat, the slab thickness of crystallizer is 100-200mm out；
(4) heating and heavy reduction rolling；Steel billet threading heating furnace, 1180-1185 DEG C of heating temperature, heating time 100-
110min, the out laggard horizontal high voltage water de-scaling of heating furnace, pressure 20-25Mpa, heavy reduction roughing start rolling temperature are 1080-
1110 DEG C, single pass reduction ratio > 18%, final reduction rate >=25%, roughing carries out 3-5 passage, is recrystallized, carefully
Change austenite grain, 950-980 DEG C of roughing end temp；880-900 DEG C of finish rolling start rolling temperature, finishing temperature are 750-780 DEG C,
Accumulative reduction ratio 70-80%, finish rolling carry out 6-8 passage, form high density dislocation during the rolling process；
(5) cooling；Temperature control is begun to cool at 730-780 DEG C, steel plate enters section cooling region, with 25-30 DEG C/s
Cooling velocity be cooled to 330-350 DEG C；
(6) normalizing is carried out, controls normalizing temperature at 880 DEG C~920 DEG C, normalizing soaking time is in 50~60min；
(7) it is tempered, controls tempering temperature at 660~680 DEG C, tempering insulation time is in 50~60min；
Final pressure tank plate ingredient is C:0.12%, Si:0.3%, Mn:1.50%, P by percentage to the quality :≤
0.010%, S :≤0.002%, Nb:0.03%, Ti:0.022%, Al:0.5%, Cr:0.6%, Cu:0.35%, Ni
1.2%, Mo:0.35%, Sb:0.1%, N:0.0025%, Mg:0.001%, Ca:0.003%, B:0.001%, rare earth La
0.003%, Ti/N between 7-10, Nb/Ti between 1.2-1.6, remaining be Fe and inevitable impurity；Steel plate thickness
25-40mm,
The heterogeneous microstructure of final pressure tank plate with volume basis is the ferrite of 77-85%, the pearl of 10-15%
Body of light, the tempering bainite of 4-8%, 3-6% martensite, yield strength 600-700MPa, tensile strength 780-
850MPa, steel plate yield tensile ratio is 0.78~0.82, elongation 20-30%, -40 DEG C of horizontal V-shape impact absorbing energy >
150J。
Embodiment 2
A kind of technique of heavy reduction rolling production steel plate of pressure vessel, it is characterised in that: process route includes: through smelting
Refining, RH refining, continuous casting, heavy reduction rolling, cooling, heat treatment；Specific step is as follows:
(1) KR molten iron pre-processes de- S, and controls S≤0.005% in molten iron, carries out top and bottom combined blown converter smelting, iron later
The mass ratio of water and steel scrap is 8: 1, and first plus steel scrap, rear hot metal charging, converter terminal basicity are 4.0-4.2；Tapping temperature is 1600-
1620℃；Using floating plug, the double slag-stopping tappings of scum rod；
(2) it carries out RH refining: being vacuumized under the conditions of not oxygen blown and carry out nature decarburization, promote Ar flow 800-850NL/
Min carries out Dehydrogenation of Molten Steel, guarantees depth vacuum processing time >=12min, the Al-Mg-Mn complex deoxidization of 0.01-0.03kg/t is added
Agent removes oxygen extra in molten steel, then carries out alloying to molten steel, carries out soft blow, soft blow argon flow control to molten steel before bull ladle
In 50-60L/min, the top of the slag is not blown open system, guarantees molten steel soft blow time 10-12min；5-8min is stood after soft blow；
(3) continuous casting process: whole blowing argon avoids molten steel oxidation, controls continuous casting process nitrogen pick-up；The covering agent in
Avoid molten steel exposed, secondary cooling water matches aqueous mode according to low-carbon alloy steel, selects low-carbon alloy covering slag；Secondary cooling area for continuous casting is using electricity
Magnetic stirs+weighs press function, electromagnetic agitation electric current 300-320A, frequency 8-15Hz, drafts 30-35mm under weight；Tundish
15-25 DEG C of the degree of superheat, the slab thickness of crystallizer is 100-200mm out；
(4) heating and heavy reduction rolling；Steel billet threading heating furnace, 1180-1185 DEG C of heating temperature, heating time 100-
110min, the out laggard horizontal high voltage water de-scaling of heating furnace, pressure 20-25Mpa, heavy reduction roughing start rolling temperature are 1080-
1110 DEG C, single pass reduction ratio > 18%, final reduction rate >=25%, roughing carries out 3-5 passage, is recrystallized, carefully
Change austenite grain, 950-980 DEG C of roughing end temp；880-900 DEG C of finish rolling start rolling temperature, finishing temperature are 750-780 DEG C,
Accumulative reduction ratio 70-80%, finish rolling carry out 6-8 passage, form high density dislocation during the rolling process；
(5) cooling；Temperature control is begun to cool at 730-780 DEG C, steel plate enters section cooling region, with 25-30 DEG C/s
Cooling velocity be cooled to 330-350 DEG C；
(6) normalizing is carried out, controls normalizing temperature at 880 DEG C~920 DEG C, normalizing soaking time is in 50~60min；
(7) it is tempered, controls tempering temperature at 660~680 DEG C, tempering insulation time is in 50~60min；
Final pressure tank plate ingredient is C:0.13%, Si:0.4%, Mn:1.60%, P by percentage to the quality :≤
0.010%, S :≤0.002%, Nb:0.04%, Ti:0.03%, Al:0.6%, Cr:0.55%, Cu:0.3%, Ni:
1.15%, Mo:0.3%, Sb:0.05%, N:0.003%, Mg:0.003%, Ca:0.005%, B:0.003%, rare earth La
0.005%, Ti/N between 7-10, Nb/Ti between 1.2-1.6, remaining be Fe and inevitable impurity；Steel plate thickness
25-40mm,
The heterogeneous microstructure of final pressure tank plate with volume basis is the ferrite of 77-85%, the pearl of 10-15%
Body of light, the tempering bainite of 4-8%, 3-6% martensite, yield strength 600-700MPa, tensile strength 780-
850MPa, steel plate yield tensile ratio is 0.78~0.82, elongation 20-30%, -40 DEG C of horizontal V-shape impact absorbing energy >
150J。
Comparative example 1
A kind of technique of heavy reduction rolling production steel plate of pressure vessel, preparation method and embodiment 1 are consistent；But it is final
Steel plate of pressure vessel ingredient is C:0.10%, Si:0.2%, Mn:1.0%, P by percentage to the quality :≤0.010%, S :≤
0.002%, Nb:0.01%, Ti:0.01%, Al:0.05%, Cr:0.16%, Cu:0.15%, Ni 1.2%, Mo:0.35%,
Sb:0.1%, N:0.0025%, Mg:0.001%, Ca:0.003%, B:0.001%, rare earth La 0.003%, remaining for Fe and
Inevitable impurity；
The heterogeneous microstructure of final pressure tank plate with volume basis is the ferrite of 70-75%, the pearl of 20-25%
Body of light, the tempering bainite of 1-6%, 1-6% martensite, yield strength 500-600MPa, tensile strength 580-
720MPa, steel plate yield tensile ratio is 0.83~0.86, elongation 15-22%, -40 DEG C of horizontal V-shape impact absorbing energy >
120J。
Comparative example 2
A kind of technique of heavy reduction rolling production steel plate of pressure vessel, preparation method and embodiment 1 are consistent；But it is final
Steel plate of pressure vessel ingredient is C:0.14%, Si:0.3%, Mn:1.20%, P by percentage to the quality :≤0.010%, S :≤
0.002%, Nb:0.05%, Ti:0.04%, Al:0.5%, Cr:0.6%, Cu:0.35%, Ni 1.2%, Mo:0.35%,
Sb:0.1%, N:0.0025%, Mg:0.001%, Ca:0.003%, B:0.001%, rare earth La 0.003%, remaining for Fe and
Inevitable impurity；
The heterogeneous microstructure of final pressure tank plate with volume basis is the ferrite of 72-76%, the pearl of 16-22%
Body of light, the tempering bainite of 4-8%, 3-6% martensite, yield strength 600-680MPa, tensile strength 720-
750MPa, steel plate yield tensile ratio is 0.80~0.90, elongation 10-20%, -40 DEG C of horizontal V-shape impact absorbing energy >
130J。
Comparative example 3
A kind of technique of heavy reduction rolling production steel plate of pressure vessel, preparation method and embodiment 1 are consistent；But it is final
Steel plate of pressure vessel ingredient is C:0.12%, Si:0.3%, Mn:1.50%, P by percentage to the quality :≤0.010%, S :≤
0.002%, Nb:0.03%, Ti:0.03%, Al:0.5%, Cr:0.6%, Cu:0.35%, Ni 1.2%, Mo:0.35%,
Sb:0.1%, N:0.0025%, Mg:0.001%, Ca:0.003%, B:0.001%, rare earth La 0.003%, remaining for Fe and
Inevitable impurity；
The heterogeneous microstructure of final pressure tank plate with volume basis is the ferrite of 86-90%, the pearl of 7-10%
Body of light, the tempering bainite of 4-8%, 3-6% martensite, yield strength 600-680MPa, tensile strength 720-
750MPa, steel plate yield tensile ratio is 0.80~0.90, elongation 10-18%, -40 DEG C of horizontal V-shape impact absorbing energy >
130J。
Comparative example 4
A kind of technique of heavy reduction rolling production steel plate of pressure vessel, preparation method and embodiment 1 are consistent；But it is final
Steel plate of pressure vessel ingredient is C:0.13%, Si:0.4%, Mn:1.60%, P by percentage to the quality :≤0.010%, S :≤
0.002%, Nb:0.03%, Ti:0.027%, Al:0.6%, Cr:0.55%, Cu:0.3%, Ni:1.15%, Mo:0.3%,
Sb:0.05%, N:0.0035%, Mg:0.003%, Ca:0.005%, B:0.003%, rare earth La 0.005%, remaining is Fe
With inevitable impurity；
The heterogeneous microstructure of final pressure tank plate with volume basis is the ferrite of 80-85%, the pearl of 7-10%
Body of light, the tempering bainite of 4-8%, 3-6% martensite, yield strength 630-680MPa, tensile strength 720-
770MPa, steel plate yield tensile ratio is 0.85~0.92, elongation 13-19%, -40 DEG C of horizontal V-shape impact absorbing energy >
130J。
Comparative example 5
A kind of technique of heavy reduction rolling production steel plate of pressure vessel, product composition and embodiment 1 are consistent, remove preparation side
Step (4) in method is different outer, other steps and embodiment 1 are consistent.
Step (4) heating and rolling；Steel billet threading heating furnace, 1175 DEG C of heating temperature, heating time 100-110min, out
The laggard horizontal high voltage water de-scaling of heating furnace, pressure 20-25Mpa, heavy reduction roughing start rolling temperature are 1060 DEG C, single pass pressure
Rate 15%, final reduction rate 20%, roughing carry out 3-5 passage, are recrystallized, fining austenite grains, roughing terminates
930 DEG C of temperature；860 DEG C of finish rolling start rolling temperature, finishing temperature is 740 DEG C, adds up reduction ratio 60-70%, and finish rolling carries out 6-8 road
It is secondary；
The heterogeneous microstructure of final pressure tank plate with volume basis is the ferrite of 60-70%, the pearl of 25-28%
Body of light, the tempering bainite of 5-8%, 5-8% martensite, yield strength 550-650MPa, tensile strength 620-
720MPa, steel plate yield tensile ratio is 0.84~0.90, elongation 12-20%, -40 DEG C of horizontal V-shape impact absorbing energy >
135J。
Comparative example 6
A kind of technique of heavy reduction rolling production steel plate of pressure vessel, product composition and embodiment 2 are consistent, remove preparation side
Step (4) in method is different outer, other steps and embodiment 2 are consistent.
Step (4) heating and rolling；Steel billet threading heating furnace, 1190 DEG C of heating temperature, heating time 100-110min, out
The laggard horizontal high voltage water de-scaling of heating furnace, pressure 20-25Mpa, heavy reduction roughing start rolling temperature are 1120 DEG C, single pass pressure
Rate 15%, final reduction rate 20%, roughing carry out 3-5 passage, are recrystallized, fining austenite grains, roughing terminates
990 DEG C of temperature；910 DEG C of finish rolling start rolling temperature, finishing temperature is 790 DEG C, adds up reduction ratio 60-70%, and finish rolling carries out 6-8 road
It is secondary；
The heterogeneous microstructure of final pressure tank plate with volume basis is the ferrite of 65-75%, the pearl of 25-28%
Body of light, the tempering bainite of 4-6%, the martensite of 4-6%, retained austenite, yield strength 570-660MPa, tensile strength
For 640-750MPa, steel plate yield tensile ratio is 0.84~0.88, elongation 15-25%, -40 DEG C of horizontal V-shape impact absorbing energy
> 140J.
Term used herein is explanation and term exemplary, and not restrictive.It is enough with a variety of due to energy of the invention
Form be embodied without departing from invention spirit or essence, it should therefore be appreciated that above-described embodiment be not limited to it is any above-mentioned
Details can not accomplish the unitary variant test of each element, each technological parameter based on length limitation, and should be in claim institute
It is widely explained in the spirit and scope of restriction, therefore falls into whole change and modification in claim or its equivalent scope all
It should be appended claims to be covered.
Claims (7)
1. a kind of technique of heavy reduction rolling production steel plate of pressure vessel, it is characterised in that: process route include: smelted,
RH refining, continuous casting, heavy reduction rolling, cooling, heat treatment；Steel plate thickness 25-40mm, wherein heavy reduction roughing start rolling temperature
It is 1080-1110 DEG C, single pass reduction ratio > 18%, final reduction rate >=25%, roughing 3-5 passage of progress, progress is again
Crystallization, fining austenite grains, 950-980 DEG C of roughing end temp；880-900 DEG C of finish rolling start rolling temperature, finishing temperature are
750-780 DEG C, add up reduction ratio 70-80%, finish rolling carries out 6-8 passage, forms high density dislocation during the rolling process.
2. a kind of technique of heavy reduction rolling production steel plate of pressure vessel, it is characterised in that: process route include: smelted,
RH refining, continuous casting, heavy reduction rolling, cooling, heat treatment；Steel plate thickness 25-40mm, wherein heavy reduction roughing start rolling temperature
It is 1080-1110 DEG C, single pass reduction ratio > 18%, final reduction rate >=25%, roughing 3-5 passage of progress, progress is again
Crystallization, fining austenite grains, 950-980 DEG C of roughing end temp；880-900 DEG C of finish rolling start rolling temperature, finishing temperature are
750-780 DEG C, add up reduction ratio 70-80%, finish rolling carries out 6-8 passage, forms high density dislocation during the rolling process；
The heterogeneous microstructure of final pressure tank plate with volume basis is the ferrite of 77-85%, the pearly-lustre of 10-15%
Body, the tempering bainite of 4-8%, 3-6% martensite, yield strength 600-700MPa, tensile strength 780-850MPa,
Steel plate yield tensile ratio is 0.78~0.82, elongation 20-30%, -40 DEG C of horizontal V-shape impact absorbing energy > 150J.
3. a kind of technique of heavy reduction rolling production steel plate of pressure vessel, it is characterised in that: process route include: smelted,
RH refining, continuous casting, heavy reduction rolling, cooling, heat treatment；Specific step is as follows:
(1) KR molten iron pre-processes de- S, and controls S≤0.005% in molten iron, carries out top and bottom combined blown converter smelting later, molten iron with
The mass ratio of steel scrap is 8: 1, and first plus steel scrap, rear hot metal charging, converter terminal basicity are 4.0-4.2；Tapping temperature is 1600-1620
℃；Using floating plug, the double slag-stopping tappings of scum rod；
(2) it carries out RH refining: being vacuumized under the conditions of not oxygen blown and carry out nature decarburization, promote Ar flow 800-850NL/min,
Dehydrogenation of Molten Steel is carried out, guarantees depth vacuum processing time >=12min, the Al-Mg-Mn double deoxidizer that 0.01-0.03kg/t is added is de-
Except oxygen extra in molten steel, alloying then is carried out to molten steel, soft blow is carried out to molten steel before bull ladle, the control of soft blow argon flow exists
50-60L/min, the top of the slag are not blown open, guarantee molten steel soft blow time 10-12min；5-8min is stood after soft blow；
(3) continuous casting process: whole blowing argon avoids molten steel oxidation, controls continuous casting process nitrogen pick-up；Covering agent avoids in
Molten steel is exposed, and secondary cooling water matches aqueous mode according to low-carbon alloy steel, selects low-carbon alloy covering slag；Secondary cooling area for continuous casting is stirred using electromagnetism
Mix+weigh press function, electromagnetic agitation electric current 300-320A, frequency 8-15Hz, drafts 30-35mm under weight；Tundish overheat
15-25 DEG C of degree, the slab thickness of crystallizer is 100-200mm out；
(4) heating and heavy reduction rolling；Steel billet threading heating furnace, 1180-1185 DEG C of heating temperature, heating time 100-
110min, the out laggard horizontal high voltage water de-scaling of heating furnace, pressure 20-25Mpa, heavy reduction roughing start rolling temperature are 1080-
1110 DEG C, single pass reduction ratio > 18%, final reduction rate >=25%, roughing carries out 3-5 passage, is recrystallized, carefully
Change austenite grain, 950-980 DEG C of roughing end temp；880-900 DEG C of finish rolling start rolling temperature, finishing temperature are 750-780 DEG C,
Accumulative reduction ratio 70-80%, finish rolling carry out 6-8 passage, form high density dislocation during the rolling process；
(5) cooling；Temperature control is begun to cool at 730-780 DEG C, steel plate enters section cooling region, with the cold of 25-30 DEG C/s
But speed is cooled to 330-350 DEG C；
(6) normalizing is carried out, controls normalizing temperature at 880 DEG C~920 DEG C, normalizing soaking time is in 50~60min；
(7) it is tempered, controls tempering temperature at 660~680 DEG C, tempering insulation time is in 50~60min；
Final pressure tank plate ingredient is C:0.12-0.13%, Si:0.3-0.4%, Mn:1.50- by percentage to the quality
1.60%, P :≤0.010%, S :≤0.002%, Nb:0.03-0.04%, Ti:0.02-0.03%, Al:0.5-0.8%, Cr:
0.4-0.6%, Cu:0.25-0.35%, Ni:1.1-1.2%, Mo:0.25-0.35%, Sb:0.05-0.1%, N:0.002-
0.0035%, Mg:0.001-0.003%, Ca:0.001-0.005%, B:0.001-0.003%, rare earth La 0.001-
0.005%, Ti/N between 7-10, Nb/Ti between 1.2-1.6, remaining be Fe and inevitable impurity；Steel plate thickness
25-40mm,
The heterogeneous microstructure of final pressure tank plate with volume basis is the ferrite of 77-85%, the pearly-lustre of 10-15%
Body, the tempering bainite of 4-8%, 3-6% martensite, yield strength 600-700MPa, tensile strength 780-850MPa,
Steel plate yield tensile ratio is 0.78~0.82, elongation 20-30%, -40 DEG C of horizontal V-shape impact absorbing energy > 150J.
4. the technique of heavy reduction rolling production steel plate of pressure vessel as described in claim 1-3, it is characterised in that: final pressure
Tank plate ingredient is C:0.12%, Si:0.3%, Mn:1.50%, P by percentage to the quality :≤0.010%, S :≤
0.002%, Nb:0.03%, Ti:0.022%, Al:0.5%, Cr:0.6%, Cu:0.35%, Ni 1.2%, Mo:0.35%,
Sb:0.1%, N:0.0025%, Mg:0.001%, Ca:0.003%, B:0.001%, rare earth La 0.003%, Ti/N are in 7-10
Between, Nb/Ti between 1.2-1.6, remaining be Fe and inevitable impurity.
5. the technique of heavy reduction rolling production steel plate of pressure vessel as described in claim 1-3, it is characterised in that: final pressure
Tank plate ingredient is C:0.13%, Si:0.4%, Mn:1.60%, P by percentage to the quality :≤0.010%, S :≤
0.002%, Nb:0.04%, Ti:0.03%, Al:0.6%, Cr:0.55%, Cu:0.3%, Ni:1.15%, Mo:0.3%,
Sb:0.05%, N:0.003%, Mg:0.003%, Ca:0.005%, B:0.003%, rare earth La 0.005%, Ti/N are in 7-10
Between, Nb/Ti between 1.2-1.6, remaining be Fe and inevitable impurity.
6. the technique of heavy reduction rolling production steel plate of pressure vessel as described in claim any one of 1-5, it is characterised in that: steel
Base threading heating furnace, 1180-1185 DEG C of heating temperature, heating time 100-110min, the laggard horizontal high voltage water de-scaling of heating furnace out,
Pressure is 20-25Mpa, and heavy reduction roughing start rolling temperature is 1080 DEG C, single pass reduction ratio 20%, final reduction rate >=
25%, roughing carries out 4 passages, is recrystallized, fining austenite grains, 950 DEG C of roughing end temp；Finish rolling start rolling temperature
880 DEG C, finishing temperature is 750 DEG C, adds up reduction ratio 70-80%, and finish rolling carries out 8 passages, formed during the rolling process highly dense
Spend dislocation.
7. the technique of heavy reduction rolling production steel plate of pressure vessel as described in claim any one of 1-5, it is characterised in that: steel
Base threading heating furnace, 1180-1185 DEG C of heating temperature, heating time 100-110min, the laggard horizontal high voltage water de-scaling of heating furnace out,
Pressure is 20-25Mpa, and heavy reduction roughing start rolling temperature is 1110 DEG C, single pass reduction ratio 19%, final reduction rate >=
28%, roughing carries out 4 passages, is recrystallized, fining austenite grains, 980 DEG C of roughing end temp；Finish rolling start rolling temperature
900 DEG C, finishing temperature is 780 DEG C, adds up reduction ratio 70-80%, and finish rolling carries out 7 passages, formed during the rolling process highly dense
Spend dislocation.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110592462A (en) * | 2019-09-19 | 2019-12-20 | 舞阳钢铁有限责任公司 | Steel plate for low-temperature equipment and production method thereof |
| CN110669987A (en) * | 2019-10-25 | 2020-01-10 | 安徽信息工程学院 | Ceramic high-strength structural steel with yield strength of 520MPa and preparation method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105821325A (en) * | 2016-06-15 | 2016-08-03 | 山东钢铁股份有限公司 | Tempered high-low-temperature toughness pipeline steel and manufacturing method |
| KR101736638B1 (en) * | 2015-12-23 | 2017-05-30 | 주식회사 포스코 | Pressure vessel steel plate with excellent hydrogen induced cracking resistance and manufacturing method thereof |
| CN108411196A (en) * | 2018-03-27 | 2018-08-17 | 武汉钢铁有限公司 | Tensile strength is 680MPa grades of large-scale mobile steelss for pressure vessel use and production method |
| US20180298463A1 (en) * | 2016-04-19 | 2018-10-18 | Jiangyin Xingcheng Special Steel Works Co., Ltd | Pressure vessel steel plate resistant against hydrogen-induced cracking and manufacturing method thereof |
| CN109136738A (en) * | 2018-06-25 | 2019-01-04 | 敬业钢铁有限公司 | A kind of high-strength low-temperature-resistant Ship Structure steel plate and preparation method thereof |
-
2019
- 2019-01-17 CN CN201910045561.6A patent/CN109825661A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101736638B1 (en) * | 2015-12-23 | 2017-05-30 | 주식회사 포스코 | Pressure vessel steel plate with excellent hydrogen induced cracking resistance and manufacturing method thereof |
| US20180298463A1 (en) * | 2016-04-19 | 2018-10-18 | Jiangyin Xingcheng Special Steel Works Co., Ltd | Pressure vessel steel plate resistant against hydrogen-induced cracking and manufacturing method thereof |
| CN105821325A (en) * | 2016-06-15 | 2016-08-03 | 山东钢铁股份有限公司 | Tempered high-low-temperature toughness pipeline steel and manufacturing method |
| CN108411196A (en) * | 2018-03-27 | 2018-08-17 | 武汉钢铁有限公司 | Tensile strength is 680MPa grades of large-scale mobile steelss for pressure vessel use and production method |
| CN109136738A (en) * | 2018-06-25 | 2019-01-04 | 敬业钢铁有限公司 | A kind of high-strength low-temperature-resistant Ship Structure steel plate and preparation method thereof |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110592462A (en) * | 2019-09-19 | 2019-12-20 | 舞阳钢铁有限责任公司 | Steel plate for low-temperature equipment and production method thereof |
| CN110669987A (en) * | 2019-10-25 | 2020-01-10 | 安徽信息工程学院 | Ceramic high-strength structural steel with yield strength of 520MPa and preparation method thereof |
| CN113549818A (en) * | 2021-06-29 | 2021-10-26 | 鞍钢股份有限公司 | High-performance steel plate for resisting corrosion of ocean total immersion area and production method thereof |
| CN113549818B (en) * | 2021-06-29 | 2022-06-14 | 鞍钢股份有限公司 | High-performance steel plate for resisting corrosion of ocean total immersion area and production method thereof |
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