CN108456827A - A kind of modified adds vanadium chrome molybdenum steel plate and its production method - Google Patents
A kind of modified adds vanadium chrome molybdenum steel plate and its production method Download PDFInfo
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- CN108456827A CN108456827A CN201810091878.9A CN201810091878A CN108456827A CN 108456827 A CN108456827 A CN 108456827A CN 201810091878 A CN201810091878 A CN 201810091878A CN 108456827 A CN108456827 A CN 108456827A
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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
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
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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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- 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
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- 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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- 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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- 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
- 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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- 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
- C21D2211/005—Ferrite
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Abstract
The invention discloses a kind of modifieds to add vanadium chrome molybdenum steel plate and its production method, and the chemical composition of the steel plate forms and mass percentage is：C：0.11~0.15%, Si：0.05~0.09%, Mn：0.40~0.60%, P：0.008~0.010%, S≤0.005%, Cr：2.00~2.50%, Mo：1.00~1.10%, V：0.28~0.35%, Ni：0.10~0.20%, Nb≤0.05%, Cu≤0.20%, Sb≤0.003%, Sn≤0.010%, As≤0.010%, surplus are Fe and inevitable impurity；The production method includes smelting molding, heating, rolling and heat treatment procedure.The present invention uses II type controlled rolling, the heat treatment process of double normalizing+tempering to solve the problems, such as that coarse grains are uneven, impact flexibility is relatively low and hardness is higher.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of modified adds vanadium chrome molybdenum steel plate and its production method.
Background technology
In hydrodesulfurization unit, hydrocracking unit, to handle hydrogeneous high-temperature high-pressure craft fluid, reactor and equipment
Base material, mainly use 2.25Cr-1Mo steel.It is proved by the destructive testing of physical device：This steel is grown under the high temperature conditions
After phase use, temper brittleness will produce.It is learnt by experiment, controls the impurity component in steel, be to have for preventing temper embrittlement
Effect, for this purpose, large-scale reactor, equipment for being on active service under high temperature and pressure hydro condition etc. to be controlled to the regulation of impurity component now
It is included in ASTM and JIS standards.But it with device enlargement, the development of processing oil product heaviness increasingly, uses at present commonly
2.25Cr-1Mo steel can not meet the light-weighted growth requirement of operation temperature, equipment.Therefore add the application of vanadium chrome molybdenum steel plate
Demand is more urgent.Add V chrome-molybdenum steel due to than 2.25Cr-1Mo steel plate（American Standard SA387Gr22, Europe superscript 13CrMo9-10）Have
Higher intensity and better high temperature creep property disclosure satisfy that pressure vessel more operation at high temperature and light-weighted requirement, because
This is using more and more extensive.Although domestic equipment manufactory technology is increasingly mature, have been able to preferably control welding quality,
Due to adding V chrome-molybdenum steel alloy contents higher, weld delayed crack and reheat crack(ing) are easy tod produce during fabrication, to a certain extent
Limit its application.Domestic steel mill's production for a long time plus vanadium chrome molybdenum steel plate to always exist base material hardness higher, when welding
Problem easy to crack, therefore domestic equipment manufactory orders when 130mm or more adds vanadium chrome molybdenum steel plate and substantially relies on import.In addition with
The development of equipment heaviness, requirement of the user to die welding system is also higher and higher, die welding technique by original 705 DEG C × 26h,
It improves to 710 DEG C × 32h.The extension of the raising of die welding heat treatment temperature, die welding time increases existing plus vanadium steel plate production
Difficulty, therefore how to ensure steel plate delivery state hardness number and maximum norm deposited strength value, become big thickness and vanadium chrome molybdenum steel plate is added to give birth to
The key of production.
Invention content
The technical problem to be solved in the present invention is to provide a kind of modifieds to add vanadium chrome molybdenum steel plate；The present invention also provides one kind
Modified adds the production method of vanadium chrome molybdenum steel plate.
In order to solve the above technical problems, the technical solution adopted by the present invention is that：A kind of modified adds vanadium chrome molybdenum steel plate, described
The chemical composition of steel plate forms and its mass percentage is：C：0.11~0.15%, Si：0.05~0.09%, Mn：0.40~
0.60%, P：0.008~0.010%, S≤0.005%, Cr：2.00~2.50%, Mo：1.00~1.10%, V：0.28~0.35%,
Ni：0.10~0.20%, Nb≤0.05%, Cu≤0.20%, Sb≤0.003%, Sn≤0.010%, As≤0.010%, surplus Fe
With inevitable impurity.
The chemical composition mechanism of action of the present invention：
The modified chrome-molybdenum steel steel plate trade mark of the present invention is to face hydrogen 12Cr2Mo1VR, face hydrogen 2.25Cr1Mo-0.3V.As one
Kind Hi-Stren steel, the steel add a variety of alloying elements such as chromium, molybdenum, vanadium, niobium, and main purpose is to generate solution strengthening,
And the precipitates such as carbide, nitride or carbonitride for obtaining them generate dispersion-strengthened action, to improve the machine of steel
Tool performance and the abilities such as anti-hydrogen embrittlement, anticorrosive.
Chromium is epochmaking alloying element in heat resisting steel and alloy.It can improve the intensity and hardness of steel, stable carbide,
It prevents carbide to decompose, and reduces diffusion of the carbon in ferrite, the aggregation velocity of carbide is made to reduce.Unfavorable side
Face：Chromium significantly improves the ductile-brittle transition temperature of steel, and chromium can promote steel belt roof bolt brittleness.
Molybdenum has solution strengthening effect to ferrite, while can also improve the stability of carbide, therefore is produced to the intensity of steel
Raw advantageous effect；Molybdenum reduces γ-Fe phase regions, expands α-Fe phase regions, and be carbide, is to improve heat resistance most to have
The alloying element of effect is dissolved into the self-diffusion for significantly inhibiting iron in parent metal, improves the recrystallization temperature of steel, strong to improve
Ferrite effectively inhibits the aggregation of cementite at 450-600 DEG C to the drag of creep, promotes the alloy carbide analysis of disperse shape
Go out, plays invigoration effect；The excellent tiny carbide of molybdenum forming properties can improve steel resistant to hydrogen corrosiveness at high temperature under high pressure, molybdenum
The quenching degree of steel can be greatly improved, and eliminates the red brittleness and temper brittleness of steel.Ill-effect is that low-alloy molybdenum steel is made to send out
Raw graphitization tendency.
Vanadium and carbon, nitrogen, oxygen have extremely strong binding force, stable carbide, nitride are formed in steel, only in high temperature
It is lower just slowly to dissolve in austenite.The carbide and nitride of these vanadium usually exist with superfine small graininess, suppression
Growing up for the migration of crystal boundary and crystal grain in steel has been made, therefore steel is made still to keep the tissue of fine grain in higher temperature, greatly
The superheated susceptivity for reducing steel improves steel heat resistance and creep-resistant property.But when the mass fraction of vanadium is more than 1%,
Declines, or even play opposite effect；The vanadium for the mass fraction for being no less than 5.7 times of carbon is added in steel, it can be complete by the carbon in steel
Portion is fixed in V4C3, then considerably increases steel at high temperature under high pressure to the stability of hydrogen；Vanadium can significantly improve low-carbon and low-alloy
The weldability of steel, vanadium can refine the as-cast structure of weld metal and reduce the superheated susceptivity of heat affected area, prevent heat affected area
The transition of the metal grain of interior nearly fusing line is grown up and is roughened；Since vanadium secures a part of carbon, the quenching degree of steel is reduced, it can
It prevents from forming martensite or other harder tissues in heat affected area, keeps heat affected area hardness excessively high, plasticity and toughness will not
Transition declines.Niobium is the alloying element for reducing γ-Fe phase regions, has certain solubility, niobium and carbon, nitrogen, oxygen to have in α-Fe
Extremely strong binding force, and extremely stable compound can be formed therewith, thus can crystal grain thinning, reduce steel superheated susceptivity and
Temper brittleness；Since carbon can be firmly fixed, when mass percent is more than 8 times of carbon content, almost all of carbon can be fixed,
Make the resistant to hydrogen performance for having fabulous；Niobium improves the heat resistance of steel, improves croop property, can form disperse educt, equally distributed
Carbide；The alloying elements such as chromium, molybdenum, vanadium, niobium, titanium, boron are added in 2.25Cr-1Mo-0.25V steel, and the master of these elements is added
Syllabus is that the generation disperse of the precipitates such as the carbide, nitride or carbonitride for generating solution strengthening, and obtain them is strong
Change acts on, to improve the mechanical performance and the abilities such as anti-hydrogen embrittlement, anticorrosive of steel.Microalloy element is used alone and several alloys
Elements compounding using when reinforcing effect very big difference is had again for different steel grades.
In view of alloying element is precipitated in the form of carbide during die welding, the solid solution strengthening effect of the steel is reduced,
The room temperature of process and elevated temperature strength surplus capacity become smaller after so that steel plate maximum norm welding heat is handled, it is contemplated that Si, P etc. have apparent solid
Molten invigoration effect, therefore while ensureing steel plate resistance to brittleness energy, the solution strengthening elements content such as suitable control Si, P ensures
The intensity of steel mould postwelding.
The thickness of steel plate of the present invention is 130~180mm.
The present invention also provides the production method that a kind of modified adds vanadium chrome molybdenum steel plate, the production method includes smelting mould
Casting, heating, rolling and heat treatment procedure；The heat treatment procedure, using double normalizing+tempering process, first time normalizing temperature
For 950~960 DEG C, second of normalizing temperature be 950~960 DEG C, temperature is 710~730 DEG C.
Rolling process of the present invention, using two-stage controlled rolling process, the first stage controls reduction in pass >=12%.
Rolling process of the present invention, using two-stage controlled rolling process, second stage adds up reduction ratio >=50%, and single track
Secondary drafts≤10%, finishing temperature >=898 DEG C.
Heat treatment procedure of the present invention is cooled down at a slow speed after first time normalizing into NAC cooling sections, red temperature control
350 DEG C are made as, water-air cooling is gone out；It is introduced into high pressure section after second of normalizing and carries out rapid cooling, is then tempered.
Heat treatment procedure of the present invention, tempering insulation time are 3.5*t minutes, and the t is the mm of thickness of steel plate, is protected
Air-cooled finished product steel plate after temperature.
Smelting molding operations of the present invention, are smelted using electric arc furnaces mode, when molten steel temperature reaches 1600 DEG C, are gone out
Steel；It is then fed into LF refining furnace and carries out refining 1h, quick deoxidation, according to de- S situations, fine tuning Mn, Mo, Ni, Cr, V content make
The component requirements for reaching this plus vanadium chrome molybdenum steel plate, carry out molding operations after vacuumize process 30min after refining and produce steel ingot.
Smelting molding operations of the present invention, the chemical composition composition and its mass percentage of steel ingot are：C：0.11~
0.15%, Si：0.05~0.09%, Mn：0.40~0.60%, P：0.008~0.010%, S≤0.005%, Cr：2.00~2.50%,
Mo：1.00~1.10%, V：0.28~0.35%, Ni：0.10~0.20%, Nb≤0.05%, Cu≤0.20%, Sb≤0.003%, Sn
≤ 0.010%, As≤0.010%, surplus are Fe and inevitable impurity.
Heating process of the present invention is executed after steel ingot is packed into dead soaking pit using multi-platform heating process and is boiled in a covered pot over a slow fire steel technique,
Steel loading temperature≤300 DEG C, turn off burner, with stove Temperature fall 8h；400 DEG C then are risen to 70 DEG C/h speed, keeps the temperature 4h；Then
930 DEG C are risen to≤75 DEG C/h, keeps the temperature 6h；1250 DEG C are risen to≤75 DEG C/h again, keeps the temperature 8h；Then it is down to≤75 DEG C/h
1230 DEG C, keep the temperature 6h.
Modified of the present invention adds vanadium chrome molybdenum steel sheet product canonical reference SA542GrDCl4a；Method for testing performance refers to
SA20。
It is using advantageous effect caused by above-mentioned technical proposal：1, the present invention is smelted using electric furnace smelting mode, P, S
Etc. objectionable impurities elements content it is low, steel is pure.2, the method for the present invention uses two-stage controlled rolling process i.e. II type controlled rolling, twice just
The heat treatment process of fire+tempering solves the problems, such as that coarse grains are uneven, impact flexibility is relatively low and hardness is higher, and rolling mill practice
Simply, easily operated, it is suitable for the common steel plant production for having quenching press, normalizing furnace, outer machine stove, car-bottom furnace.3, after testing originally
The hardness number invented under steel plate normalizing+tempering condition of delivery of production meets Brinell hardness≤235HB；Steel plate is through simulating postwelding heat
Mechanical property that treated：Rp0.2：415-620MPa, Rm：590~760MPa, A >=19.0%, K at -10 DEG Cv2>=54J, HB≤
225.4, the present invention plus vanadium chrome molybdenum steel plate meet the demand under the steel plate condition of delivery compared with soft, generate and split when can reduce welding
The risk of line can effectively reduce the difficulty of equipment manufacturing manufacture；The cold-bending property of steel plate of the present invention is good, when material makes not
Cracking, steel plate template is good, can be widely used in the equipment such as hydrogenation reactor.5, the present invention is multiple using Cr, Mo, V alloy element
Closing intensifying method realizes the Design of Chemical Composition of alloy content, by rational heat treatment process, has obtained having more tiny
Institutional framework and the matched resistance to brittleness of good obdurability can steel plate, while the requirement of soft can be met again, produced
Steel plate items mechanical performance index meet technical conditions requirement, and production cost significantly reduce.6, the method for the present invention obtains
The mechanical property of low yield strength ratio chrome molybdenum steel plate be significantly larger than standard required value, intensity, yield tensile ratio are moderate, and hardness is relatively low, and modeling is tough
Property is good；The generation for effectively reducing weld delayed crack and reheat crack(ing) expands its application range.
Description of the drawings
Fig. 1 is organization chart at the head thickness center of 1 steel plate maximum analog postwelding of embodiment；
Fig. 2 is organization chart at the head thickness center of 2 steel plate maximum analog postwelding of embodiment；
Fig. 3 is organization chart at the head thickness center of 3 steel plate maximum analog postwelding of embodiment；
Fig. 4 is organization chart at the head thickness center of 4 steel plate maximum analog postwelding of embodiment；
Fig. 5 is organization chart at the head thickness center of 5 steel plate maximum analog postwelding of embodiment；
Fig. 6 is organization chart at the head thickness center of 6 steel plate maximum analog postwelding of embodiment；
Fig. 7 is organization chart at the head thickness center of 7 steel plate maximum analog postwelding of embodiment.
Specific implementation mode
The present invention is described in further detail in the following with reference to the drawings and specific embodiments.
Modified of the present invention adds the production method of vanadium chrome molybdenum steel plate to include smelting molding, heating, rolling and heat treatment procedure,
Specific process step is as described below：
（1）Smelt molding operations：It is smelted using electric arc furnaces mode, when molten steel temperature reaches 1600 DEG C, tapping；It is then fed into LF
Refining 1h is carried out in refining furnace, quick deoxidation, according to de- S situations, fine tuning Mn, Mo, Ni, Cr, V content make up to this plus vanadium
The component requirements of chrome molybdenum steel plate carry out molding operations after vacuumize process 30min after refining and produce steel ingot；
（2）Heating process：Using multi-platform heating process, is executed after steel ingot is packed into dead soaking pit and boil in a covered pot over a slow fire steel technique, steel loading temperature≤
300 DEG C, turn off burner, with stove Temperature fall 8h；400 DEG C then are risen to 70 DEG C/h speed, keeps the temperature 4h；Then with≤75 DEG C/h
930 DEG C are risen to, 6h is kept the temperature；1250 DEG C are risen to≤75 DEG C/h again, keeps the temperature 8h；1230 DEG C then are down to≤75 DEG C/h, heat preservation
6h；
（3）Rolling process：Using two-stage controlled rolling process, the first stage controls reduction in pass >=12%；The accumulative pressure of second stage
Lower rate >=50%, and single pass rolling reduction≤10%, finishing temperature >=898 DEG C；
（3）Heat treatment procedure：Using the heat treatment process of double normalizing+tempering, first time normalizing temperature is 950~960 DEG C, just
It is cooled down at a slow speed into NAC cooling sections after fire, red temperature control is 350 DEG C, goes out water-air cooling；Second of normalizing temperature be
950~960 DEG C, it is introduced into high pressure section after normalizing and carries out rapid cooling, is then tempered；Temperature is 710~730 DEG C, soaking time
For 3.5*t min（T is steel plate thickness, unit：mm）, air-cooled be made adds vanadium chrome molybdenum steel plate after heat preservation.
Embodiment 1
The present embodiment modified adds vanadium chrome molybdenum steel plate thickness to be 144mm, and chemical composition composition and mass percentage are：C：
0.14%, Si：0.05%, Mn：0.56%, P：0.008%, S：0.002%, Cr：2.30%, Mo：1.02%, V：0.35%, Ni：0.16%,
Nb：0.030%, Cu：0.08%, Sb：0.002%, Sn：0.004%, As：0.005%, surplus is Fe and inevitable impurity.
The present embodiment modified adds the production method of vanadium chrome molybdenum steel plate to include smelting molding, heating, rolling and heat treatment work
Sequence, specific process step are as described below：
（1）Smelt molding operations：It is smelted using electric arc furnaces mode, when molten steel temperature reaches 1600 DEG C, tapping；It is then fed into LF
Refining 1h is carried out in refining furnace, quick deoxidation carries out molding operations after vacuumize process 30min after refining and produces steel ingot；Steel
Ingot chemical composition forms and its mass percentage is：C：0.14%, Si：0.05%, Mn：0.56%, P：0.008%, S：0.002%,
Cr：2.30%, Mo：1.02%, V：0.35%, Ni：0.16%, Nb：0.030%, Cu：0.08%, Sb：0.002%, Sn：0.004%, As：
0.005%, surplus is Fe and inevitable impurity；
（2）Heating process：Using multi-platform heating process, is executed after steel ingot is packed into dead soaking pit and boil in a covered pot over a slow fire steel technique, steel loading temperature 300
DEG C, turn off burner, with stove Temperature fall 8h；400 DEG C then are risen to 70 DEG C/h speed, keeps the temperature 4h；Then it is risen to 75 DEG C/h
930 DEG C, keep the temperature 6h；1250 DEG C are risen to 75 DEG C/h again, keeps the temperature 8h；1230 DEG C then are down to 75 DEG C/h, keeps the temperature 6h；
（3）Rolling process：Using two-stage controlled rolling process, it is 12% that the first stage, which controls reduction in pass,；The accumulative pressure of second stage
Lower rate is 80%, and single pass rolling reduction is 10%, 898 DEG C of finishing temperature；
（4）Heat treatment procedure：Using the heat treatment process of double normalizing+tempering, first time normalizing temperature is 950 DEG C, after normalizing
It is cooled down at a slow speed into NAC cooling sections, red temperature control is 350 DEG C, goes out water-air cooling；Second of normalizing temperature is 950 DEG C,
It is introduced into high pressure section after normalizing and carries out rapid cooling, is then tempered；Temperature is 710 DEG C, soaking time 504min, empty after heat preservation
Cold be made adds vanadium chrome molybdenum steel plate.
Add the Simulated post-weld heat treatment technique of sample used in vanadium chrome-molybdenum steel foliation service check obtained by the present embodiment：It is minimum
Simulate postwelding（Min.PWHT）Heat treatment condition is 705 DEG C × 8h, maximum analog postwelding（Max.PWHT）Heat treatment condition is 705
℃×32h；The inspection result of gained steel plate physicochemical property is shown in Tables 1 and 2, at the head thickness center of steel plate maximum analog postwelding
Tissue is shown in Fig. 1.
Mechanical property of 1 embodiment of table, 1 steel plate after Simulated post-weld heat treatment（Plate thickness 1/2）
2 embodiment of table, 1 steel plate maximum die welding tissue and inclusion analysis result
The mechanical property of the present embodiment steel plate is significantly larger than standard requirement it can be seen from table 1, table 2 and Fig. 1, and yield tensile ratio is moderate,
Plasticity and toughness are good.Crystal grain is superfine, is organized as ferrite+tempering bainite.
Embodiment 2
The present embodiment modified adds vanadium chrome molybdenum steel plate thickness to be 162mm, and chemical composition composition and mass percentage are：C：
0.14%, Si：0.09%, Mn：0.60%, P：0.008%, S：0.003%, Cr：2.45%, Mo：1.06%, V：0.28%, Ni：0.13%,
Nb：0.033%, Cu：0.08%, Sb：0.002%, Sn：0.003%, As：0.005%, surplus is Fe and inevitable impurity.
The present embodiment modified adds the production method of vanadium chrome molybdenum steel plate to include smelting molding, heating, rolling and heat treatment work
Sequence, specific process step are as described below：
（1）Smelt molding operations：It is smelted using electric arc furnaces mode, when molten steel temperature reaches 1600 DEG C, tapping；It is then fed into LF
Refining 1h is carried out in refining furnace, quick deoxidation carries out molding operations after vacuumize process 30min after refining and produces steel ingot；Steel
Ingot chemical composition forms and its mass percentage is：C：0.14%, Si：0.09%, Mn：0.60%, P：0.008%, S：0.003%,
Cr：2.45%, Mo：1.06%, V：0.28%, Ni：0.13%, Nb：0.033%, Cu：0.08%, Sb：0.002%, Sn：0.003%, As：
0.005%, surplus is Fe and inevitable impurity；
（2）Heating process：Using multi-platform heating process, is executed after steel ingot is packed into dead soaking pit and boil in a covered pot over a slow fire steel technique, steel loading temperature 290
DEG C, turn off burner, with stove Temperature fall 8h；400 DEG C then are risen to 70 DEG C/h speed, keeps the temperature 4h；Then it is risen to 70 DEG C/h
930 DEG C, keep the temperature 6h；1250 DEG C are risen to 70 DEG C/h again, keeps the temperature 8h；1230 DEG C then are down to 65 DEG C/h, keeps the temperature 6h；
（3）Rolling process：Using two-stage controlled rolling process, it is 14% that the first stage, which controls reduction in pass,；The accumulative pressure of second stage
Lower rate is 60%, and single pass rolling reduction is 9%, 918 DEG C of finishing temperature；
（4）Heat treatment procedure：Using the heat treatment process of double normalizing+tempering, first time normalizing temperature is 960 DEG C, after normalizing
It is cooled down at a slow speed into NAC cooling sections, red temperature control is 350 DEG C, goes out water-air cooling；Second of normalizing temperature is 950 DEG C,
It is introduced into high pressure section after normalizing and carries out rapid cooling, is then tempered；Temperature is 710 DEG C, soaking time 567min, empty after heat preservation
Cold be made adds vanadium chrome molybdenum steel plate.
Add the Simulated post-weld heat treatment technique of sample used in vanadium chrome-molybdenum steel foliation service check obtained by the present embodiment：It is minimum
Simulate postwelding（Min.PWHT）Heat treatment condition is 705 DEG C × 8h, maximum analog postwelding（Max.PWHT）Heat treatment condition is 705
℃×32h；The inspection result of gained steel plate physicochemical property is shown in Table 3 and table 4, at the head thickness center of steel plate maximum analog postwelding
Tissue is shown in Fig. 2.
Mechanical property of 3 embodiment of table, 2 steel plate after Simulated post-weld heat treatment（Plate thickness 1/2）
4 embodiment of table, 2 steel plate maximum die welding tissue and inclusion analysis result
The mechanical property of the present embodiment steel plate is met the requirements of the standard it can be seen from table 3, table 4 and Fig. 2, moderate strength, hardness compared with
It is low, it is organized as the tempered structure of bainite.
Embodiment 3
The present embodiment modified adds vanadium chrome molybdenum steel plate thickness to be 180mm, and chemical composition composition and mass percentage are：C：
0.15%, Si：0.07%, Mn：0.60%, P：0.008%, S：0.003%, Cr：2.20%, Mo：1.05%, V：0.32%, Ni：0.15%,
Nb：0.035%, Cu：0.06%, Sb：0.002%, Sn：0.005%, As：0.007%, surplus is Fe and inevitable impurity.
The present embodiment modified adds the production method of vanadium chrome molybdenum steel plate to include smelting molding, heating, rolling and heat treatment work
Sequence, specific process step are as described below：
（1）Smelt molding operations：It is smelted using electric arc furnaces mode, when molten steel temperature reaches 1600 DEG C, tapping；It is then fed into LF
Refining 1h is carried out in refining furnace, quick deoxidation carries out molding operations after vacuumize process 30min after refining and produces steel ingot；Steel
Ingot chemical composition forms and its mass percentage is：C：0.15%, Si：0.07%, Mn：0.60%, P：0.008%, S：0.003%,
Cr：2.20%, Mo：1.05%, V：0.32%, Ni：0.15%, Nb：0.035%, Cu：0.06%, Sb：0.002%, Sn：0.005%, As：
0.007%, surplus is Fe and inevitable impurity；
（2）Heating process：Using multi-platform heating process, is executed after steel ingot is packed into dead soaking pit and boil in a covered pot over a slow fire steel technique, steel loading temperature 280
DEG C, turn off burner, with stove Temperature fall 8h；400 DEG C then are risen to 70 DEG C/h speed, keeps the temperature 4h；Then it is risen to 65 DEG C/h
930 DEG C, keep the temperature 6h；1250 DEG C are risen to 70 DEG C/h again, keeps the temperature 8h；1230 DEG C then are down to 65 DEG C/h, keeps the temperature 6h；
（3）Rolling process：Using two-stage controlled rolling process, it is 15% that the first stage, which controls reduction in pass,；The accumulative pressure of second stage
Lower rate is 50%, and single pass rolling reduction is 7%, 900 DEG C of finishing temperature；
（4）Heat treatment procedure：Using the heat treatment process of double normalizing+tempering, first time normalizing temperature is 950 DEG C, after normalizing
It is cooled down at a slow speed into NAC cooling sections, red temperature control is 350 DEG C, goes out water-air cooling；Second of normalizing temperature is 950 DEG C,
It is introduced into high pressure section after normalizing and carries out rapid cooling, is then tempered；Temperature is 710 DEG C, soaking time 630min, empty after heat preservation
Cold be made adds vanadium chrome molybdenum steel plate.
Add vanadium chrome molybdenum steel plate Brinell hardness≤230HB obtained by the present embodiment；Mechanics of the steel plate after Simulated post-weld heat treatment
Performance is：Rp0.2：550MPa, Rm：655MPa, A：26.0%, K at -10 DEG Cv2：273J, HB≤225；Steel plate maximum analog postwelding
Head thickness center at tissue see Fig. 3.
The mechanical property of the present embodiment steel plate is met the requirements of the standard, and moderate strength, hardness is relatively low, is organized as returning for bainite
Fire tissue.
Embodiment 4
The present embodiment modified adds vanadium chrome molybdenum steel plate thickness to be 140mm, and chemical composition composition and mass percentage are：C：
0.15%, Si：0.09%, Mn：0.45%, P：0.009%, S：0.005%, Cr：2.05%, Mo：1.08%, V：0.32%, Ni：0.17%,
Nb：0.033%, Cu：0.09%, Sb：0.003%, Sn：0.002%, As：0.007%, surplus is Fe and inevitable impurity.
The present embodiment modified adds the production method of vanadium chrome molybdenum steel plate to include smelting molding, heating, rolling and heat treatment work
Sequence, specific process step are as described below：
（1）Smelt molding operations：It is smelted using electric arc furnaces mode, when molten steel temperature reaches 1600 DEG C, tapping；It is then fed into LF
Refining 1h is carried out in refining furnace, quick deoxidation carries out molding operations after vacuumize process 30min after refining and produces steel ingot；Steel
Ingot chemical composition forms and its mass percentage is：C：0.15%, Si：0.09%, Mn：0.45%, P：0.009%, S：0.005%,
Cr：2.05%, Mo：1.08%, V：0.32%, Ni：0.17%, Nb：0.033%, Cu：0.09%, Sb：0.003%, Sn：0.002%, As：
0.007%, surplus is Fe and inevitable impurity；
（2）Heating process：Using multi-platform heating process, is executed after steel ingot is packed into dead soaking pit and boil in a covered pot over a slow fire steel technique, steel loading temperature 295
DEG C, turn off burner, with stove Temperature fall 8h；400 DEG C then are risen to 70 DEG C/h speed, keeps the temperature 4h；Then it is risen to 60 DEG C/h
930 DEG C, keep the temperature 6h；1250 DEG C are risen to 65 DEG C/h again, keeps the temperature 8h；1230 DEG C then are down to 60 DEG C/h, keeps the temperature 6h；
（3）Rolling process：Using two-stage controlled rolling process, it is 16% that the first stage, which controls reduction in pass,；The accumulative pressure of second stage
Lower rate is 65%, and single pass rolling reduction is 9%, 925 DEG C of finishing temperature；
（4）Heat treatment procedure：Using the heat treatment process of double normalizing+tempering, first time normalizing temperature is 950 DEG C, after normalizing
It is cooled down at a slow speed into NAC cooling sections, red temperature control is 350 DEG C, goes out water-air cooling；Second of normalizing temperature is 960 DEG C,
It is introduced into high pressure section after normalizing and carries out rapid cooling, is then tempered；Temperature is 720 DEG C, soaking time 490min, empty after heat preservation
Cold be made adds vanadium chrome molybdenum steel plate.
Add vanadium chrome molybdenum steel plate Brinell hardness≤228HB obtained by the present embodiment；Mechanics of the steel plate after Simulated post-weld heat treatment
Performance is：Rp0.2：577MPa, Rm：686MPa, A：23.0%, K at -10 DEG Cv2：243J, HB≤220HB；Steel plate maximum analog is welded
Tissue is shown in Fig. 4 at head thickness center afterwards.
The mechanical property of the present embodiment steel plate is met the requirements of the standard, and moderate strength, hardness is relatively low, is organized as returning for bainite
Fire tissue.
Embodiment 5
The present embodiment modified adds vanadium chrome molybdenum steel plate thickness to be 150mm, and chemical composition composition and mass percentage are：C：
0.13%, Si：0.08%, Mn：0.47%, P：0.008%, S：0.003%, Cr：2.07%, Mo：1.05%, V：0.30%, Ni：0.13%,
Nb：0.01%, Cu：0.09%, Sb：0.002%, Sn：0.005%, As：0.006%, surplus is Fe and inevitable impurity.
The present embodiment modified adds the production method of vanadium chrome molybdenum steel plate to include smelting molding, heating, rolling and heat treatment work
Sequence, specific process step are as described below：
（1）Smelt molding operations：It is smelted using electric arc furnaces mode, when molten steel temperature reaches 1600 DEG C, tapping；It is then fed into LF
Refining 1h is carried out in refining furnace, quick deoxidation carries out molding operations after vacuumize process 30min after refining and produces steel ingot；Steel
Ingot chemical composition forms and its mass percentage is：C：0.13%, Si：0.08%, Mn：0.47%, P：0.008%, S：0.003%,
Cr：2.07%, Mo：1.05%, V：0.30%, Ni：0.13%, Nb：0.01%, Cu：0.09%, Sb：0.002%, Sn：0.005%, As：
0.006%, surplus is Fe and inevitable impurity；
（2）Heating process：Using multi-platform heating process, is executed after steel ingot is packed into dead soaking pit and boil in a covered pot over a slow fire steel technique, steel loading temperature 300
DEG C, turn off burner, with stove Temperature fall 8h；400 DEG C then are risen to 70 DEG C/h speed, keeps the temperature 4h；Then it is risen to 75 DEG C/h
930 DEG C, keep the temperature 6h；1250 DEG C are risen to 75 DEG C/h again, keeps the temperature 8h；1230 DEG C then are down to 75 DEG C/h, keeps the temperature 6h；
（3）Rolling process：Using two-stage controlled rolling process, it is 15% that the first stage, which controls reduction in pass,；The accumulative pressure of second stage
Lower rate is 70%, and single pass rolling reduction is 9%, 920 DEG C of finishing temperature；
（4）Heat treatment procedure：Using the heat treatment process of double normalizing+tempering, first time normalizing temperature is 950 DEG C, after normalizing
It is cooled down at a slow speed into NAC cooling sections, red temperature control is 350 DEG C, goes out water-air cooling；Second of normalizing temperature is 950 DEG C,
It is introduced into high pressure section after normalizing and carries out rapid cooling, is then tempered；Temperature is 710 DEG C, soaking time 525min, empty after heat preservation
Cold be made adds vanadium chrome molybdenum steel plate.
Add vanadium chrome molybdenum steel plate Brinell hardness≤230HB obtained by the present embodiment；Mechanics of the steel plate after Simulated post-weld heat treatment
Performance is：Rp0.2：525MPa, Rm：650MPa, A：25.0%, K at -10 DEG Cv2：282J, HB≤215；Steel plate maximum analog postwelding
Head thickness center at tissue see Fig. 5.
The mechanical property of the present embodiment steel plate is met the requirements of the standard, and moderate strength, hardness is relatively low, is organized as returning for bainite
Fire tissue.
Embodiment 6
The present embodiment modified adds vanadium chrome molybdenum steel plate thickness to be 130mm, and chemical composition composition and mass percentage are：C：
0.11%, Si：0.07%, Mn：0.40%, P：0.010%, S：0.004%, Cr：2.00%, Mo：1.00%, V：0.33%, Ni：0.10%,
Nb：0.05%, Cu：0.20%, Sb：0.003%, Sn：0.010%, As：0.010%, surplus is Fe and inevitable impurity.
The present embodiment modified adds the production method of vanadium chrome molybdenum steel plate to include smelting molding, heating, rolling and heat treatment work
Sequence, specific process step are as described below：
（1）Smelt molding operations：It is smelted using electric arc furnaces mode, when molten steel temperature reaches 1600 DEG C, tapping；It is then fed into LF
Refining 1h is carried out in refining furnace, quick deoxidation carries out molding operations after vacuumize process 30min after refining and produces steel ingot；Steel
Ingot chemical composition forms and its mass percentage is：C：0.11%, Si：0.07%, Mn：0.40%, P：0.010%, S：0.004%,
Cr：2.00%, Mo：1.00%, V：0.33%, Ni：0.10%, Nb：0.05%, Cu：0.20%, Sb：0.003%, Sn：0.010%, As：
0.010%, surplus is Fe and inevitable impurity；
（2）Heating process：Using multi-platform heating process, is executed after steel ingot is packed into dead soaking pit and boil in a covered pot over a slow fire steel technique, steel loading temperature 300
DEG C, turn off burner, with stove Temperature fall 8h；400 DEG C then are risen to 70 DEG C/h speed, keeps the temperature 4h；Then it is risen to 70 DEG C/h
930 DEG C, keep the temperature 6h；1250 DEG C are risen to 70 DEG C/h again, keeps the temperature 8h；1230 DEG C then are down to 75 DEG C/h, keeps the temperature 6h；
（3）Rolling process：Using two-stage controlled rolling process, it is 13% that the first stage, which controls reduction in pass,；The accumulative pressure of second stage
Lower rate is 60%, and single pass rolling reduction is 8%, 900 DEG C of finishing temperature；
（4）Heat treatment procedure：Using the heat treatment process of double normalizing+tempering, first time normalizing temperature is 960 DEG C, after normalizing
It is cooled down at a slow speed into NAC cooling sections, red temperature control is 350 DEG C, goes out water-air cooling；Second of normalizing temperature is 960 DEG C,
It is introduced into high pressure section after normalizing and carries out rapid cooling, is then tempered；Temperature is 730 DEG C, soaking time 455min, empty after heat preservation
Cold be made adds vanadium chrome molybdenum steel plate.
Add vanadium chrome molybdenum steel plate Brinell hardness≤225HB obtained by the present embodiment；Mechanics of the steel plate after Simulated post-weld heat treatment
Performance is：Rp0.2：545MPa, Rm：680MPa, A：24.0%, K at -10 DEG Cv2：272J, HB≤217；Steel plate maximum analog postwelding
Head thickness center at tissue see Fig. 6.
The mechanical property of the present embodiment steel plate is met the requirements of the standard, and moderate strength, hardness is relatively low, is organized as returning for bainite
Fire tissue.
Embodiment 7
The present embodiment modified adds vanadium chrome molybdenum steel plate thickness to be 160mm, and chemical composition composition and mass percentage are：C：
0.12%, Si：0.06%, Mn：0.50%, P：0.009%, S：0.002%, Cr：2.50%, Mo：1.10%, V：0.29%, Ni：0.20%,
Nb：0.02%, Cu：0.10%, Sb：0.001%, Sn：0.003%, As：0.005%, surplus is Fe and inevitable impurity.
The present embodiment modified adds the production method of vanadium chrome molybdenum steel plate to include smelting molding, heating, rolling and heat treatment work
Sequence, specific process step are as described below：
（1）Smelt molding operations：It is smelted using electric arc furnaces mode, when molten steel temperature reaches 1600 DEG C, tapping；It is then fed into LF
Refining 1h is carried out in refining furnace, quick deoxidation carries out molding operations after vacuumize process 30min after refining and produces steel ingot；Steel
Ingot chemical composition forms and its mass percentage is：C：0.12%, Si：0.06%, Mn：0.50%, P：0.009%, S：0.002%,
Cr：2.50%, Mo：1.10%, V：0.29%, Ni：0.20%, Nb：0.02%, Cu：0.10%, Sb：0.001%, Sn：0.003%, As：
0.005%, surplus is Fe and inevitable impurity；
（2）Heating process：Using multi-platform heating process, is executed after steel ingot is packed into dead soaking pit and boil in a covered pot over a slow fire steel technique, steel loading temperature 295
DEG C, turn off burner, with stove Temperature fall 8h；400 DEG C then are risen to 70 DEG C/h speed, keeps the temperature 4h；Then it is risen to 75 DEG C/h
930 DEG C, keep the temperature 6h；1250 DEG C are risen to 75 DEG C/h again, keeps the temperature 8h；1230 DEG C then are down to 75 DEG C/h, keeps the temperature 6h；
（3）Rolling process：Using two-stage controlled rolling process, it is 15% that the first stage, which controls reduction in pass,；The accumulative pressure of second stage
Lower rate is 70%, and single pass rolling reduction is 9%, 920 DEG C of finishing temperature；
（4）Heat treatment procedure：Using the heat treatment process of double normalizing+tempering, first time normalizing temperature is 960 DEG C, after normalizing
It is cooled down at a slow speed into NAC cooling sections, red temperature control is 350 DEG C, goes out water-air cooling；Second of normalizing temperature is 960 DEG C,
It is introduced into high pressure section after normalizing and carries out rapid cooling, is then tempered；Temperature is 730 DEG C, soaking time 560min, empty after heat preservation
Cold be made adds vanadium chrome molybdenum steel plate.
Add vanadium chrome molybdenum steel plate Brinell hardness≤235HB obtained by the present embodiment；Mechanics of the steel plate after Simulated post-weld heat treatment
Performance is：Rp0.2：545MPa, Rm：695MPa, A：23.0%, K at -10 DEG Cv2：252J, HB≤221；Steel plate maximum analog postwelding
Head thickness center at tissue see Fig. 7.
The mechanical property of the present embodiment steel plate is met the requirements of the standard, and moderate strength, hardness is relatively low, is organized as returning for bainite
Fire tissue.
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although with reference to above-described embodiment to this hair
It is bright to be described in detail, it will be understood by those of ordinary skill in the art that：Still can the present invention be modified or be waited
With replacing, without departing from the spirit or scope of the invention, or any substitutions, the power in the present invention should all be covered
In sharp claimed range.
Claims (10)
1. a kind of modified adds vanadium chrome molybdenum steel plate, which is characterized in that the chemical composition of the steel plate forms and its quality percentage contains
Amount is：C：0.11~0.15%, Si：0.05~0.09%, Mn：0.40~0.60%, P：0.008~0.010%, S≤0.005%,
Cr：2.00~2.50%, Mo：1.00~1.10%, V：0.28~0.35%, Ni：0.10~0.20%, Nb≤0.05%, Cu≤
0.20%, Sb≤0.003%, Sn≤0.010%, As≤0.010%, surplus are Fe and inevitable impurity.
2. a kind of modified according to claim 1 adds vanadium chrome molybdenum steel plate, which is characterized in that the thickness of the steel plate is
130~180mm.
3. adding the production method of vanadium chrome molybdenum steel plate based on a kind of modified as claimed in claim 1 or 2, which is characterized in that described
Production method includes smelting molding, heating, rolling and heat treatment procedure；The heat treatment procedure, using double normalizing+Temperer
Skill, first time normalizing temperature are 950~960 DEG C, and second of normalizing temperature is 950~960 DEG C, and temperature is 710~730
℃。
4. a kind of modified according to claim 3 adds the production method of vanadium chrome molybdenum steel plate, which is characterized in that the rolling
Process, using two-stage controlled rolling process, the first stage controls reduction in pass >=12%.
5. a kind of modified according to claim 3 adds the production method of vanadium chrome molybdenum steel plate, which is characterized in that the rolling
Process, using two-stage controlled rolling process, second stage adds up reduction ratio >=50%, and single pass rolling reduction≤10%, finishing temperature
≥898℃。
6. a kind of modified according to claim 3-5 any one adds the production method of vanadium chrome molybdenum steel plate, feature to exist
In, the heat treatment procedure is cooled down at a slow speed after first time normalizing into NAC cooling sections, and red temperature control is 350 DEG C,
Go out water-air cooling；It is introduced into high pressure section after second of normalizing and carries out rapid cooling, is then tempered.
7. a kind of modified according to claim 3-5 any one adds the production method of vanadium chrome molybdenum steel plate, feature to exist
In the heat treatment procedure, tempering insulation time is 3.5*t minutes, and the t is the mm of thickness of steel plate, air-cooled system after heat preservation
Obtain finished steel plate.
8. a kind of modified according to claim 3-5 any one adds the production method of vanadium chrome molybdenum steel plate, feature to exist
In, the smelting molding operations are smelted using electric arc furnaces mode, when molten steel temperature reaches 1600 DEG C, tapping；It is then fed into LF
Refining 1h is carried out in refining furnace, quick deoxidation, according to de- S situations, fine tuning Mn, Mo, Ni, Cr, V content make up to this plus vanadium
The component requirements of chrome molybdenum steel plate carry out molding operations after vacuumize process 30min after refining and produce steel ingot.
9. a kind of modified according to claim 3-5 any one adds the production method of vanadium chrome molybdenum steel plate, feature to exist
In the smelting molding operations, the chemical composition composition and its mass percentage of steel ingot are：C：0.11~0.15%, Si：
0.05~0.09%, Mn：0.40~0.60%, P：0.008~0.010%, S≤0.005%, Cr：2.00~2.50%, Mo：1.00~
1.10%, V：0.28~0.35%, Ni：0.10~0.20%, Nb≤0.05%, Cu≤0.20%, Sb≤0.003%, Sn≤0.010%,
As≤0.010%, surplus are Fe and inevitable impurity.
10. a kind of modified according to claim 3-5 any one adds the production method of vanadium chrome molybdenum steel plate, feature to exist
In, the heating process is executed after steel ingot is packed into dead soaking pit using multi-platform heating process and is boiled in a covered pot over a slow fire steel technique, and steel loading temperature≤
300 DEG C, turn off burner, with stove Temperature fall 8h；400 DEG C then are risen to 70 DEG C/h speed, keeps the temperature 4h；Then with≤75 DEG C/h
930 DEG C are risen to, 6h is kept the temperature；1250 DEG C are risen to≤75 DEG C/h again, keeps the temperature 8h；1230 DEG C then are down to≤75 DEG C/h, heat preservation
6h。
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Application publication date: 20180828 |