CN106591713A - High-strength container steel plate and preparation method thereof - Google Patents
High-strength container steel plate and preparation method thereof Download PDFInfo
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- CN106591713A CN106591713A CN201610937130.7A CN201610937130A CN106591713A CN 106591713 A CN106591713 A CN 106591713A CN 201610937130 A CN201610937130 A CN 201610937130A CN 106591713 A CN106591713 A CN 106591713A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
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- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention provides a high-strength container steel plate and a preparation method thereof. The high-strength container steel plate comprises the following chemical components in percentage by weight: 0.06-0.08% of C, 0.20-0.30% of Si, 1.3-1.5% of Mn, less than or equal to 0.010% of P, less than or equal to 0.005% of S, 0.035-0.045% of Nb, 0.20-0.30% of Ni, 0.15-0.25% of Cr, 0.15-0.25% of Mo, 0.035-0.045% of V, 0.01-0.02% of Ti and the balance Fe and inevitable impurities. The high-strength container steel plate provided by the invention has tensile strength greater than 610 MPa, and is a low-welding-crack-sensitivity steel plate with good plasticity and excellent low-temperature impact toughness. A final metallographic structure of the steel plate is tempered sorbite and tempered bainite.
Description
Technical field
The present invention relates to low-alloy steel field, more particularly to a kind of high strength container steel plate and preparation method thereof.
Background technology
With developing rapidly for the industries such as the energy, oil, chemical industry, water power, engineering structure is increasingly towards maximization, light weight
Change direction to develop, plate property is put forward higher requirement, such as Large Oil Tank, large-size spherical tank, offshore oil production platform, big
Span bridge, large-scale pipeline etc., these heavy construction structures propose new requirement to the solder technology of steel plate, that is, require steel plate
The Large Heat Input Welding technologies such as the bright one side submerged arc for increasing substantially welding efficiency, electrogas arc welding or electroslag welding can be adopted to be welded
Connect, thus bring new problem, the i.e. performance of welding heat affected zone (HAZ) to traditional low-alloy high-strength steel (HSLA)
(intensity, toughness) deteriorates, the problems such as be also easy to produce welding cold cracking.In the development of large-scale complete project core steels for pressure vessel use
Cheng Zhong, improves the quality of steel heavy plate for pressure vessels, and production can bear Large Heat Input Welding and have low-welding crack-sensitive again
High-quality steel heavy plate for pressure vessels be always the target that numerous metallargists seek assiduously.Steel plate is in the weld seam after welding
Heat affecting coarse grain zone (CGHAZ) penalty, grain coarsening, be to affect steel plate yield the problems such as be also easy to produce welding cold cracking
With the subject matter of quality.The drawbacks of traditional Hi-Stren steel is its impact flexibility and weldability while intensity is improved
Can be remarkably decreased, welding crack sensibility increases, to the manufacture of large-scale steel structure difficulty is brought, can particularly give the peace of user
Full production threatens, therefore, while high intensity is pursued, the crack sensitivity for reducing steel plate is increasingly taken seriously.
The content of the invention
In view of this, the present invention provides a kind of high strength container steel plate and preparation method thereof.
The present invention provides a kind of high strength container steel plate, and its chemical composition includes by weight percentage：C：0.06～
0.08%, Si：0.20～0.30%, Mn：1.3～1.5%, P：≤ 0.010%, S：≤ 0.005%, Nb：0.035～
0.045%, Ni：0.20～0.30%, Cr：0.15～0.25%, Mo：0.15～0.25%, V：0.035～0.045%, Ti：
0.01～0.02%, balance of Fe and inevitable impurity.
Further, the chemical composition of the high strength container steel plate also meets following condition：
Pcm=C+30/Si+Ni/60+ (Mn+Cr+Cu)/20+Mo/15+V/10+5B≤0.20%.
The present invention also provides a kind of preparation method of above-mentioned high strength container steel plate, and it comprises the steps：
Step a, smelting and refining
Converter smelting using the molten iron and steel scrap through desulfurization pretreatment as raw material, smelt, converter tapping by single slag technique
Temperature control is at 1620～1640 DEG C；RH application of vacuum operation is using the deep degasification technique of circulation；
Step b, continuous casting
Using two cold water distributions of dynamic soft-reduction, electromagnetic agitation and optimization, low overheat and permanent casting speed continuous casting technique.
Step c, heating
Heating and temperature control at 1200 DEG C～1220 DEG C, total time inside furnace >=270min, wherein soaking time >=40min；
Step d, rolling and cooling
Rolled using two benches TMCP techniques, roughing mills start rolling temperature is more than 1100 DEG C；Control recrystallization rolling is completed
Slab afterwards treats 2～3 times that temperature thickness is finished steel plate；Finish rolling start rolling temperature is less than 950 DEG C, for steel of the thickness more than 16mm
Plate, finish rolling start rolling temperature is less than 930 DEG C；Finish rolling finishing temperature is 820～870 DEG C；Cooldown rate is 10～15 DEG C/s, eventually cold temperature
Spend for 590 DEG C～630 DEG C.
Step e, Tempering and Quenching
Hardening heat is 900～920 DEG C；Temperature is controlled at 600～650 DEG C.
Further,
In step e, the time inside furnace of quenching is：t×1.4min/mm+10min；
The temperature retention time of tempering is：T × 2.4min/mm+ (20～30) min；
Wherein, wherein t is steel plate thickness, and unit is mm.
The present invention provides a kind of high strength container steel plate and preparation method thereof, and the high strength container steel plate passes through rationalization
Composition design is learned, with reference to above-mentioned preparation technology, tensile strength is more than 610MPa, with good plasticity, excellent low-temperature impact
The low-welding crack-sensitive of toughness, the final metallographic structure of the steel plate is tempered sorbite and tempering bainite.The steel plate can be with
Suitable for low-temperature storage tank, spherical tank, pressure steel pipe of hydropower station, the manufacture of ice sea region ocean platform.The above-mentioned system that the present invention is provided
Standby technique is relatively low using two-phase control rolling control, rolling load and the requirement to rolling mill characteristic.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described.
The metallographic structure figure of surface of steel plate prepared by Fig. 1 embodiment of the present invention 2；
The metallographic structure figure of surface of steel plate prepared by Fig. 2 embodiment of the present invention 3.
Specific embodiment
The invention discloses a kind of high strength container steel plate and preparation method thereof, those skilled in the art can use for reference herein
Content, is suitably modified technological parameter realization.Specifically, all similar replacements and change are to people in the art
It is it will be apparent that they are considered as being included in the present invention for member.The method of the present invention and application have passed through preferably real
Apply example to be described, related personnel substantially can be in without departing from present invention, spirit and scope to method described herein
It is modified with application or suitably the technology of the present invention is realized and applied to change with combining.
The present invention provides a kind of high strength container steel plate, and its chemical composition includes by weight percentage：C：0.06～
0.08%, Si：0.20～0.30%, Mn：1.3～1.5%, P：≤ 0.010%, S：≤ 0.005%, Nb：0.035～
0.045%, Ni：0.20～0.30%, Cr：0.15～0.25%, Mo：0.15～0.25%, V：0.035～0.045%, Ti：
0.01～0.02%, balance of Fe and inevitable impurity.
Preferably, the high strength container steel plate chemical composition includes by weight percentage：C：0.06～0.08%,
Si：0.20～0.25%, Mn：1.4～1.5%, P：≤ 0.010%, S：≤ 0.005%, Nb：0.035～0.045%, Ni：
0.22～0.28%, Cr：0.15～0.2%, Mo：0.17～0.2%, V：0.038～0.045%, Ti：0.01～0.02%,
Balance of Fe and inevitable impurity.
Preferably, the chemical composition of the high strength container steel plate also meets following condition：
Pcm=C+30/Si+Ni/60+ (Mn+Cr+Cu)/20+Mo/15+V/10+5B≤0.20%.
Accordingly, the present invention also provides a kind of preparation method of above-mentioned high strength container steel plate, and it comprises the steps：
Step a, smelting and refining
Converter smelting using the molten iron and steel scrap through desulfurization pretreatment as raw material, smelt, converter tapping by single slag technique
Temperature control is at 1620～1640 DEG C；RH application of vacuum is using the deep degasification technique of circulation；
Step b, continuous casting
Using two cold water distributions of dynamic soft-reduction, electromagnetic agitation and optimization, low overheat and permanent casting speed continuous casting technique.
Step c, heating
Heating and temperature control at 1200 DEG C～1220 DEG C, total time inside furnace >=270min, wherein soaking time >=40min；
Step d, rolling and cooling
Rolled using two benches TMCP techniques, roughing mills start rolling temperature is more than 1100 DEG C；Control recrystallization rolling is completed
Slab afterwards treats 2～3 times that temperature thickness is finished steel plate；Finish rolling start rolling temperature is less than 950 DEG C, for steel of the thickness more than 16mm
Plate, finish rolling start rolling temperature is less than 930 DEG C；Finish rolling finishing temperature is 820～870 DEG C；Cooldown rate is 10～15 DEG C/s, eventually cold temperature
Spend for 590 DEG C～630 DEG C.
Step e, Tempering and Quenching
Hardening heat is 900～920 DEG C；Temperature is controlled at 600～650 DEG C.
Step a is the operation smelted and refine, in this step：Converter smelting is using the molten iron through desulfurization pretreatment and gives up
Steel is used as raw material.Using the smelting of single slag technique, low-carbon ferromanganese and silico-aluminum deoxidation alloying, pushing off the slag of tapping, it is ensured that once draw
Carbon success, Tapping Temperature of Bof is controlled at 1620～1640 DEG C.Molten steel is in the further deoxidation of LF ladle refining furnaces, desulfurization, removal
Be mingled with, adjusting component and temperature, and required to carry out alloying element adjustment according to chemical Composition Control.RH operations are deep de- using circulation
Gas technique, on the premise of ensureing that liquid steel temperature is stable the gas contents such as hydrogen, oxygen, nitrogen are greatly reduced, and reduce pernicious gas to steel
The adverse effect of matter, the chemical component weight percentage of the molten steel for finally giving is C：0.06～0.08%, Si：0.20～
0.30%th, Mn：1.3～1.5%, P：≤ 0.010%, S：≤ 0.005%, Nb:0.035～0.045%, Ni：0.20～
0.30%th, Cr：0.15～0.25%, Mo：0.15～0.25%, V：0.035～0.045%, Ti:0.01～0.02%, surplus
For Fe and inevitable impurity.
Step b is the operation of continuous casting, and preferably, in this step, conticaster is straight circular-arc type continuous casting machine, using solidification
End dynamic soft-reduction and electromagnetic agitation, and dynamic secondary cooling technology, it is ensured that constant temperature, permanent pulling rate technique cast, carry out protection and pour
Note, guards against secondary oxidation of steel and air-breathing nitrogen pick-up.Strand macroscopic examination result should meet B classes center segregation≤1.5 grade, and center is dredged
Pine≤1.5 grades.
Step c is the operation of heating, and this step should fully ensure that billet heating temperature and soaking time.Heating and temperature control
At 1200 DEG C～1220 DEG C, total time inside furnace >=270min, wherein soaking time >=40min, it is ensured that the abundant solid solution of alloying element,
Board briquette is uniform.Furnace gas atmosphere burns steel, micro-pressure operation using weak oxide or reducing atmosphere, it is to avoid casting billet surface generates excessive
Iron scale and difficult removal iron scale.
Step d is the operation for rolling and cooling down, and in this step, is rolled using two benches TMCP techniques, roughing mills open rolling
Temperature while recrystallization rolling ensures single pass heavy reduction rolling, and can meet wanting for accumulative deflection more than 1100 DEG C
Ask.Slab after the completion of recrystallization rolling treats 2～3 times that temperature thickness is finished steel plate；Based on avoiding being rolled in partial, re-crystallization area
Mixed crystal problem is manufactured into, control final rolling temperature is less than 950 DEG C, the steel plate in actual production for thickness specification more than 16mm, essence
Roll start rolling temperature to be typically chosen less than 930 DEG C, in order to ensure that deformation is carried out in austenitic area all the time, select the finish to gauge temperature of finish rolling
Spend for 820～870 DEG C.Cooldown rate is 10～15 DEG C/s, and final cooling temperature is 590 DEG C～630 DEG C.
Step e is the operation of Tempering and Quenching, in this step, preferably according to the specification steel plate of different-thickness quenching is determined
And tempering process parameters, specifically：
Hardening heat is 900～920 DEG C, time inside furnace：t×1.4min/mm+10min；Tempering temperature control system is 600～650
DEG C, temperature retention time t × 2.4min/mm+ (20～30) min, wherein t is steel plate thickness, and unit is mm.
The present invention provides a kind of high strength container steel plate and preparation method thereof, and the high strength container steel plate passes through rationalization
Composition design is learned, with reference to above-mentioned preparation technology, tensile strength is more than 610MPa, with good plasticity, excellent low-temperature impact
The low-welding crack-sensitive of toughness, the final metallographic structure of the steel plate is tempered sorbite and tempering bainite.The steel plate can be with
Suitable for low-temperature storage tank, spherical tank, pressure steel pipe of hydropower station, the manufacture of ice sea region ocean platform.The above-mentioned system that the present invention is provided
Standby technique is relatively low using two-phase control rolling control, rolling load and the requirement to rolling mill characteristic.
With reference to embodiment, the present invention is expanded on further.These embodiments are only to best mode for carrying out the invention
Description, do not have any restriction to the scope of the present invention.
Embodiment 1
Raw material molten iron through Deep Desulphurization of Hot Metal, converter top and bottom blowing, ladle argon-blown, LF external refinings, RH application of vacuum and
Continuous casting process obtains the 250mm heavy slabs of chemical component weight percentage shown in table 1.1202 DEG C of slab heating temperature, always in stove
Time 320min, 1180 DEG C of first stage start rolling temperature, single pass is with respect to more than reduction ratio at least two passages controlling 20%
More than, when rolled piece thickness is 38mm, treat that temperature, to 1020 DEG C, subsequently carries out second stage rolling on roller-way, finishing temperature is not
Control, finished steel plate thickness is 12mm.After rolling terminates, steel plate air cooling enters heat rectification machine, and cold bed is cooled down after heat is rectified.Steel plate impeller blasting
Send into glowing furnace afterwards to be processed, 900 DEG C of hardening heat, time inside furnace：t×1.4min/mm+10min.650 DEG C of temperature,
Temperature retention time t × 2.4min/mm+30min, wherein t are steel plate thickness, and unit is mm.The steel plate is finally obtained.
Embodiment 2
Embodiment is 1210 DEG C with embodiment 1, wherein heating-up temperature, total time inside furnace 318min, first stage rolling
Start rolling temperature be 1183 DEG C, the start rolling temperature of second stage rolling is 891 DEG C, and middle base treats temperature thickness for 96mm, finish to gauge temperature
Spend for 835 DEG C, finished steel plate thickness is 38mm.After rolling terminates, steel plate is entered and accelerates cooling (ACC) device, cooling velocity 13
DEG C/s, 613 DEG C of final cooling temperature, cold bed is cooled down after heat is rectified.Send into glowing furnace after steel plate impeller blasting to be processed, 920 DEG C of hardening heat,
Time inside furnace：t×1.4min/mm+10min.610 DEG C of temperature, temperature retention time t × 2.4min/mm+20min, wherein t are
Steel plate thickness, unit is mm.The steel plate is finally obtained.
Fig. 1 is the metallographic structure figure of surface of steel plate manufactured in the present embodiment.It can be seen that the final metallographic structure of steel plate is
Tempered sorbite and tempering bainite.
Embodiment 3
Embodiment is 1218 DEG C with embodiment 1, wherein heating-up temperature, total time inside furnace 362min, first stage rolling
Start rolling temperature be 1176 DEG C, the start rolling temperature of second stage rolling is 892 DEG C, and middle base treats temperature thickness for 100mm, finish to gauge temperature
Spend for 841 DEG C, finished steel plate thickness is 50mm.After rolling terminates, steel plate is entered and accelerates cooling (ACC) device, cooling velocity 12
DEG C/s, 603 DEG C of final cooling temperature, cold bed is cooled down after heat is rectified.Send into glowing furnace after steel plate impeller blasting to be processed, 920 DEG C of hardening heat,
Time inside furnace：t×1.4min/mm+10min.600 DEG C of temperature, temperature retention time t × 2.4min/mm+20min, wherein t are
Steel plate thickness, unit is mm.The steel plate is finally obtained.
Fig. 2 is the metallographic structure figure of surface of steel plate manufactured in the present embodiment.It can be seen that the final metallographic structure of steel plate is
Tempered sorbite and tempering bainite.
Embodiment 1 to the chemical composition of embodiment 3 is listed in table 1：
The chemical composition (wt%) of the embodiment of the present invention 1～3 of table 1
| Embodiment | C | Si | Mn | P | S | Nb | V | Ti | Ni | Cr | Mo |
| 1 | 0.06 | 0.2 | 1.49 | 0.007 | 0.002 | 0.043 | 0.044 | 0.018 | 0.28 | 0.20 | 0.19 |
| 2 | 0.07 | 0.24 | 1.45 | 0.008 | 0.003 | 0.038 | 0.038 | 0.015 | 0.23 | 0.17 | 0.17 |
| 3 | 0.08 | 0.25 | 1.40 | 0.008 | 0.003 | 0.035 | 0.040 | 0.013 | 0.22 | 0.16 | 0.18 |
The mechanical property of the steel plate that testing example 1 is prepared to embodiment 3, test result is listed in table 2：
The mechanical property of the steel plate of the embodiment of the present invention 1～3 of table 2
The cold-bending property of the steel plate that testing example 1 is prepared to embodiment 3, test result is listed in table 3：
The cold-bending property of the steel plate of the embodiment of the present invention 1～3 of table 3
| Embodiment | Thickness of slab (mm) | Cambered axle diameter (mm) | Standoff distance (mm) | Angle of bend ° | Result of the test |
| 1 | 12 | 36 | 62 | 180 | It is qualified |
| 2 | 38 | 75 | 127 | 180 | It is qualified |
| 3 | 50 | 75 | 127 | 180 | It is qualified |
The NDT performances of steel plate prepared by testing example 2 and embodiment 3, test result is listed in table 4：
The NDT performances of the steel plate of 4 embodiment of the present invention of table 2～3
The constant load tensile stress etching of steel plate prepared by testing example 2, test result is listed in table 5：
The constant load tensile stress etching assay of the steel plate of 5 embodiment of the present invention of table 2
| Load KN | Soak time | It is disconnected no | Evaluation |
| 0.90ReL | 230 hours | It is disconnected | Do not pass through |
| 0.90ReL | 251 hours | It is disconnected | Do not pass through |
| 0.85ReL | 460 hours | It is disconnected | Do not pass through |
| 0.85ReL | 513 hours | It is disconnected | Do not pass through |
| 0.80ReL | 720 hours | It is no | Pass through |
| 0.80ReL | 720 hours | It is no | Pass through |
| 0.80ReL | 720 hours | It is no | Pass through |
The HIC assays of steel plate prepared by embodiment 2 are listed in table 6：
The steel plate HIC assays of 6 embodiment of the present invention of table 2
As shown in the above, the tensile strength of the high strength container steel plate that the present invention is provided is more than 610MPa, with good
Good plasticity, excellent low-temperature impact toughness, the low welding crack sensitivity steel plate of decay resistance.The final metallographic structure of steel plate
For tempered sorbite and tempering bainite.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (4)
1. a kind of high strength container steel plate, it is characterised in that its chemical composition includes by weight percentage：C：0.06～
0.08%, Si：0.20～0.30%, Mn：1.3～1.5%, P：≤ 0.010%, S：≤ 0.005%, Nb：0.035～
0.045%, Ni：0.20～0.30%, Cr：0.15～0.25%, Mo：0.15～0.25%, V：0.035～0.045%, Ti：
0.01～0.02%, balance of Fe and inevitable impurity.
2. high strength container steel according to claim 1, it is characterised in that the chemical composition of the high strength container steel plate
Also meet following condition：
Pcm=C+30/Si+Ni/60+ (Mn+Cr+Cu)/20+Mo/15+V/10+5B≤0.20%.
3. the preparation method of the high strength container steel plate described in claim 1 or 2, it is characterised in that comprise the steps：
Step a, smelting and refining
Converter smelting using the molten iron and steel scrap through desulfurization pretreatment as raw material, smelt, Tapping Temperature of Bof by single slag technique
Control is at 1620～1640 DEG C；RH application of vacuum operation is using the deep degasification technique of circulation；
Step b, continuous casting
Using two cold water distributions of dynamic soft-reduction, electromagnetic agitation and optimization, low overheat and permanent casting speed continuous casting technique.
Step c, heating
Heating and temperature control at 1200 DEG C～1220 DEG C, total time inside furnace >=270min, wherein soaking time >=40min；
Step d, rolling and cooling
Rolled using two benches TMCP techniques, roughing mills start rolling temperature is more than 1100 DEG C；After the completion of control recrystallization rolling
Slab treats 2～3 times that temperature thickness is finished steel plate；Finish rolling start rolling temperature is less than 950 DEG C, for steel plate of the thickness more than 16mm,
Finish rolling start rolling temperature is less than 930 DEG C；Finish rolling finishing temperature is 820～870 DEG C；Cooldown rate be 10～15 DEG C/s, final cooling temperature
For 590 DEG C～630 DEG C.
Step e, Tempering and Quenching
Hardening heat is 900～920 DEG C；Temperature is controlled at 600～650 DEG C.
4. preparation method according to claim 3, it is characterised in that
In step e, the time inside furnace of quenching is：t×1.4min/mm+10min；
The temperature retention time of tempering is：T × 2.4min/mm+ (20～30) min；
Wherein, wherein t is steel plate thickness, and unit is mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610937130.7A CN106591713A (en) | 2016-11-02 | 2016-11-02 | High-strength container steel plate and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN111621708A (en) * | 2020-06-30 | 2020-09-04 | 南阳汉冶特钢有限公司 | Novel steel plate with impact toughness higher than P690QL2 steel plate for LPG ship storage tank and production method thereof |
| CN114381652A (en) * | 2020-10-19 | 2022-04-22 | 宝山钢铁股份有限公司 | Corrosion-resistant steel and steel plate for low-density movable pressure container and manufacturing method thereof |
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Application publication date: 20170426 |