CN109022735A - A kind of high temperature resistance and high strength drop-bottom stainless steel plate and production method - Google Patents
A kind of high temperature resistance and high strength drop-bottom stainless steel plate and production method Download PDFInfo
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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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- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
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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
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- 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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- 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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- 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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- 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
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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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
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
Abstract
The present invention relates to a kind of high temperature resistance and high strength drop-bottom stainless steel plate and its production method, the drop-bottom stainless steel plate yield strength >=30MPa, component and weight percent content at 1200 DEG C of high temperature are as follows: C:0.05~0.08%；Si:0.40~0.80%；Mn:1.00~1.60%；P, S :≤0.010%；N:0.02~0.09%；Ni:10.0~12.0%；Cr:22.00~24%；Mo:0.10~0.50%；Nb:0.02~0.05%；V:0.040~0.090%；Ti:0.01~0.04%, remaining is Fe and inevitable impurity.The present invention improves in terms of component and production method two, improves the elevated temperature strength of drop-bottom, prolongs its service life.
Description
Technical field
The invention belongs to special steel technical fields, and in particular to a kind of high temperature resistance and high strength drop-bottom stainless steel plate and life
Production method.
Background technique
With the fast development of China's silicon steel engineering, domestic cold-rolled orientation silicon steel yield is up to 1,200,000 tons.Ring annealing furnace
(ROF furnace) is the Novel annealing furnace to grow up on the basis of orientation silicon steel tunnel annealing furnace technology, can be big using ROF furnace
It is big to reduce energy consumption, productivity is improved, and workshop length is substantially shorter.Every about 80,000 tons of ROF furnace annual capacity.Furnace bottom
Plate carries out high annealing for carrying heat- treated steel volume in ROF furnace, belongs to high expendable part, drop-bottom operation schematic diagram is shown in Fig. 1.Often
Seat ROF furnace needs drop-bottom 100~120, and current domestic drop-bottom material trademark is mainly 0Cr23Ni13, service life only 18
A month or so.Based on every 80,000 tons of ROF furnace annual capacity, the whole nation has 15 ROF furnaces, and extreme portions are stainless using 0Cr23Ni13
Steel plate needs 1000 pieces of drop-bottom, calculated by current service life 18 months, needs to change 600 pieces every year, cost about 200,000,000.By enterprise
Severe cost pressure influences, more than 100 blocks damage especially severe can only be replaced every year and without the drop-bottom for repairing value, remaining furnace
Bottom plate can only frequently repair and impaired operation, not only brings a large amount of reparation consumption and maintenance workload, but also because of repairing quality
Deficiency and drop-bottom impaired operation, also cause silicon steel coil stack face imprint and bead defective.The generation of defect not only affects
Surface of silicon steel quality and the market competitiveness, meanwhile, when delivery, also needs to carry out the trimming of 50-100mm, and yield rate reduces by 2% or more.
According to the yield of current annual 500000 tons of orientation silicon steels, 15000 yuan of tax included price calculating per ton, only this item causes process to lose
It is annual nearly 1.5 hundred million yuan reachable.
Chen Jing etc. is in " H2The research of the OCr23Ni13 steel corrosion crackle of different machining states under gas shielded " (Hubei engineering
Institute's journal, the 2nd phase in 1997) text proposes: at 1200 DEG C, H2In protective atmosphere, 0Cr23Nil3 steel as cast condition steel plate corrosion is main
It is to be extended along crystal boundary, makes grain-boundary weakness, cause early-age crack；The corrosion of forged steel plate mainly along steel plate near surface sulfurizing, is formed
Sulfide crack initiation.Song front yard is newly equal, and in " research for improving annealing furnace disc element thermal fatigue life ", (Hubei Polytichnic College is learned
Report, the 8th phase in 2003) in text the main reason for thinking crackle be the heat due to being generated by periodic high temperature eustasy
Fatigue rupture.After cracked, since stress concentrates on crack tip, value increases with the length of crackle and constantly increases,
And as continuing on for drop-bottom extends to be getting faster.Liu Cheng aims at " nitrogen-contained stainless steel process study " (Chinese smelting
Gold, the 5th phase in 2004) show that nitrogen-contained stainless steel is smelted with AOD furnace, it is feasible for carrying out nitrogen alloying technology using nitrogen
's.Zhu Zhang " heat resisting steel and high temperature alloy (Ⅺ) " (Beijing: Chemical Industry Press, 1996) etc. in the operating condition, furnace
Bottom plate not only will also suffer the erosion of high temperature oxidation stability gas, by several through compressed and stretching alternating load effect
It after the use in a period, begins to crack, crackle is germinated with Member Lip to center portion extension, and ultimate failure is scrapped.With
The upper paper majority only carries out alloying raising performance etc. from crackle genesis mechanism, increase [N] and analyzes and researches,
Lack comprehensive control measure, can not fundamentally improve the comprehensive performance and service life of drop-bottom stainless steel.
Patent 85102472 proposes to be added rare element such as titanium, molybdenum etc. in the material and improves furnace bottom plate material at high temperature
Intensity；Patent 96311699.1 in drop-bottom using rare earth and effective gas decontamination technology is added, to obtain excellent
Good mechanical behavior under high temperature；Patent 96239815.25 proposes a kind of Combined base plate of furnace of annealing furnace, and drop-bottom is by two layers
Or two layers or more of metal material is combined, main part is normal steel casting material, and composite portion is the gold of heat-and corrosion-resistant
Belong to material, this drop-bottom can bear the erosion of high temperature and pernicious gas, and service life extends 2~3 times, and cost only increases about
5~10%；Patent 98235819.9 proposes that a kind of novel bottom plate for heat treating furnace, the outer edge of drop-bottom are plum blossom shape,
Its petal number is 8~24, is cracked on each petal, its suffered stress dispersion is made, so that crackle is to length and width
Expansion rate slow down, so that the service life of drop-bottom than is originally much improved, to reduce production cost；Patent
200520092270.6 proposing hollow cellular structure drop bottom, it can effectively extend 2 times of service life.Above-mentioned several mentioned patents
In, it refers to the drop-bottom component system based on increasing alloying element or rare element, changes seldom in technique, and use multiple
Condensation material, the scheme for changing drop-bottom internal structure external structure then will increase dramatically production direct cost and time cost, and scale
There are larger difficulty for popularization, therefore cannot fundamentally guarantee the high-level mechanical property of heat-resistance stainless steel drop-bottom and longer
Service life.
Summary of the invention
The technical problem to be solved by the present invention is to aiming at the above shortcomings existing in the prior art, provide a kind of high temperature resistant
High-intensitive drop-bottom stainless steel plate and production method, in drop-bottom with using electric slag refusion and smelting in stainless steel production technology
Mode purifies steel, improves the degree of purity of molten steel, by increasing N content, while adding the microalloys such as Nb, V, Ti and coming further
Fining austenite grains prolong its service life, simultaneously to improve orientation silicon steel annular furnace drop-bottom steel elevated temperature strength
Improve orientation silicon steel lumber recovery.
In order to solve the above technical problems, present invention provide the technical scheme that
A kind of high temperature resistance and high strength drop-bottom stainless steel plate is provided, the drop-bottom stainless steel plate is at 1200 DEG C of high temperature
When yield strength >=30MPa, component and weight percent content are as follows: C:0.05~0.08%；Si:0.40~0.80%；Mn:
1.00~1.60%；P, S :≤0.010%；N:0.02~0.09%；Ni:10.0~12.0%；Cr:22.00~24%；Mo:
0.10~0.50%；Nb:0.02~0.05%；V:0.040~0.090%；Ti:0.01~0.04%, remaining is Fe and can not
The impurity avoided.
Preferably, component and weight percent content are as follows: C:0.05~0.07%；Si:0.50~0.70%；Mn:
1.00~1.60%；P, S :≤0.010%；N:0.03~0.08%；Ni:11.0~12.0%；Cr:22.00~24%；Mo:
0.20~0.40%；Nb:0.02~0.04%；V:0.050~0.070%；Ti:0.02~0.03%, remaining is Fe and can not
The impurity avoided.
According to the above scheme, with a thickness of 1000~2000mm, diameter is the high temperature resistance and high strength drop-bottom stainless steel plate
1000~2500mm.
The present invention also provides the production methods of above-mentioned high temperature resistance and high strength drop-bottom stainless steel plate, including following technique to walk
It is rapid: to be smelted using electric furnace+oxygen gun blowing top-bottom blowing mode, control tapping temperature at 1650~1690 DEG C, then adopt
It is refined with LF furnace, and LF bottom blowing N Gas Alloying, while carrying out microalloy adjusting, adjusted in VD furnace by control vacuum pressure
The nitrogen content in steel is saved, after ingredient is met the requirements, carries out molding casting, then uses 70%Al2O3+ 30%CaF2Binary slag system
Carrying out electroslag remelting in electroslag refining furnace, esr process timing is automatic to spray into aluminium powder, 40~50g/20min of additional amount,
Whole process uses nitrogen-sealed, ESR ingot natural air cooling after remelting, and molding and electroslag remelting whole process use nitrogen-sealed, then carries out
Forging carries out solution treatment after the completion of forging, obtains chemical component qualification, and the pure slab of steel is processed to obtain high temperature resistant
High-intensitive drop-bottom stainless steel plate.
According to the above scheme, the forging process heating process are as follows: ESR ingot is put into 600 DEG C of temperature heating ovens, heat preservation 5
Hour, be to slowly warm up to 850 DEG C, heating rate is no more than 50 DEG C/h, keep the temperature 3 hours, after be to slowly warm up to 1220 ± 10 DEG C, rise
Warm rate is no more than 100 DEG C/h, keeps the temperature 4 hours.
According to the above scheme, the solution treatment process heating process are as follows: ESR ingot is put into 600 DEG C of heating furnaces, heat preservation 5
Hour, be to slowly warm up to 850 DEG C, heating rate is no more than 50 DEG C/h, keep the temperature 3 hours, after be to slowly warm up to 1130 ± 10 DEG C, rise
Warm rate is no more than 100 DEG C/h, keeps the temperature 4 hours.
Above-mentioned alloys producing and principle are as follows:
The content of C is 0.05~0.08% in steel of the present invention.C is to improve the most effective element of steel strength, and carbon content is every
Increase by 0.1% tensile strength and about improve 90MPa, yield strength about improves 40~50MPa.But the increasing of stainless steel C content
Add, carbide can be generated in steel, around form chromium depleted layer, will lead to the intercrystalline corrosion of austenitic stainless steel.Improve austenite
The anti intercrystalline corrosion ability of stainless steel, most effective method are the carbon contents reduced in steel.Therefore, for the purpose of the present invention, it is necessary to
Strict control C content；It is preferably controlled within 0.05~0.07%.
Si is added in steel as the element for improving intensity, and Si is added in stainless steel can be conducive to ferritic formation,
Ferrite can be improved the intensity of stainless steel in steel, but because ferrite from matrix austenite has different thermal expansion coefficients, in heat
Steel plate is caused to crack in processing, Si content cannot be excessively high generally in stainless steel；Mn content is selected 0.40~0.80%, preferably
Ground is controlled 0.50~0.70%.
Ni element can expand austenite phase field, reduce the transition temperature of austenite, be the main component of austenitic stainless steel
One of.But Ni metal is somewhat expensive, is the key that invention stainless steel drop-bottom is succeeded using reasonable ingredient and technique, Ni contains
Amount is preferably controlled within 11.0~12.0%.
Mo is the element for reducing austenite phase field, while also inhibiting the decomposition of austenite.Mo is also a solution strengthening member
Element can effectively improve steel strength especially elevated temperature strength, moreover it is possible to improve the anti-hydrogen embrittlement ability and temper resistance of steel.Mo may be used also
To improve the ability of the pitting corrosion of austenitic stainless steel, because of the steel containing molybdenum, oxidation film is finer and close, can enhance stainless steel
Passivation ability.In addition, Mo is also ferritic stabilizer, it cannot be excessive in stainless steel.The selection of Mo content 0.10~
0.50%, it is preferably controlled within 0.20~0.40%.
N promotes the effect of austenite generally suitable with C, and about the 30 of Ni times.In the steel of C content≤0.03%,
0.05~0.25% N is added, it can be with stable austenite, the negative effect for compensating reduction C content and causing.As joined N in steel,
δ-ferrite is not generated when then solidifying, directly formation austenite dendrites.When austenite is grown up, stablize ferritic element be precipitated in
Interdendritic position.Final tissue be austenite dendrites and be located at interdendritic ferrite.It, can also be with by control appropriate
It is fully austenitic structure.N can also make austenite solution strengthening, and under conditions of keeping ferrite content roughly the same, N is added
The tensile strength and yield strength of steel can be significantly improved.But excessively high N content will cause N aggregation, form cavity, N content selection
0.02~0.09%, it is preferably controlled within 0.03~0.08%.
Ti can with forming tiny, stable, disperse TiN, Ti (C, N) particle, effectively pinning crystal boundary, resistance with elements such as C, N
Only high temperature austenite grain coarsening is played the role of refining crystal grain, thus can significantly improve the room temperature intensity of steel, elevated temperature strength and
The toughness of steel.It is also possible between effectively preventing rolling pass and after rolling, austenite grain is grown up.But excessive
Ti easily forms coarse particle of TiN in steel, leads to the embrittlement of crystal boundary, reduces the toughness of material, thus the selection of Ti content 0.010~
0.040%, it is preferably controlled within 0.02~0.03%.
The effect of Nb, V are similar to Ti, but stronger than Ti, are a kind of elements for refining crystal grain.Nb, V are strong carbon nitridations
Object formation element can form extremely stable (Nb, V) (C, N) compound with carbon, nitrogen.Along austenite grain boundary Dispersed precipitate
(Nb, V) (C, N) particle hinders crystal grain to grow up, significantly improves original austenite grains Coarsening Temperature.But Nb also easily with Fe, C
Equal elements form Low melting point eutectic, to increase the tendency of steel plate fire check, therefore, the addition of Nb are controlled in ingredient design
Amount, the selection of Nb content are preferably controlled within 0.02~0.04% 0.02~0.05%, V content selection 0.040~
0.090%, it is preferable that the weight percent of V is 0.05~0.07%.
The present invention increases austenite stainless hardness of steel, addition by increasing N content in drop-bottom austenitic stainless steel
The microalloys such as Nb, V, Ti carry out further fining austenite grains, while reducing the content of the elements such as C, Si, reach raising drop-bottom
Structure stability under high temperature reduces ferrite, carbide, the generation of intermetallic compound σ-phase；In addition stainless in drop-bottom
In steel production technology by the way of electric slag refusion and smelting, harmful inclusion content is reduced, purifies steel, compact tissue, refinement
Crystal grain chemically improves orientation silicon steel annular furnace drop-bottom steel elevated temperature strength in terms of ingredient and purity of steel two, subtracts
Few crackle generates trend, slows down crack propagation velocity to finally improve using effect and the service life of drop-bottom, while improving and taking
To silicon steel lumber recovery.
The beneficial effects of the present invention are: 1, with traditional orientation silicon steel high temperature resistant drop-bottom steel compared with, the present invention
Provided stainless steel plate reduces the content of Ni, Si in the case where not improving C content in terms of chemical component, addition Nb,
V, Ti, Mo microalloy and N, dispersion-strengtherning is to improve the creep resistance and enduring quality of cast steel；It is closed by Si, Mo, Nb, Ti, V etc.
Gold element is reasonably combined, and the elevated temperature strength of drop-bottom can be improved, and increases the structure stability under drop-bottom high temperature, reduces iron element
The generation of body, carbide etc. reaches and not only reduces crackle generation, but also slows down the double effects of crack propagation.2, producer of the present invention
Method can both play stirring action using LF refining furnace bottom blowing nitrogen, and nitrogen pick-up, and electricity can be achieved the effect that again by reducing argon gas dosage
Slag remelting purifies steel, and compact tissue further increases the elevated temperature strength of drop-bottom, prolongs the service life.
Detailed description of the invention
Fig. 1 is drop-bottom operation schematic diagram；
Fig. 2 is comparative example of the present invention and embodiment 1-5 electroslag forging process heating process curve；
Fig. 3 is comparative example and embodiment 1-5 solution treatment process heating process curve.
Specific embodiment
Technical solution in order to enable those skilled in the art to better understand the present invention, with reference to the accompanying drawing to the present invention make into
One step detailed description.
High temperature resistance and high strength drop-bottom stainless steel plate described in the embodiment of the present invention at 1200 DEG C of high temperature yield strength >=
30MPa, component and weight percent content are as follows: C:0.05~0.08%；Si:0.40~0.80%；Mn:1.00~
1.60%；P, S :≤0.010%；N:0.02~0.09%；Ni:10.0~12.0%；Cr:22.00~24%；Mo:0.10~
0.50%；Nb:0.02~0.05%；V:0.040~0.090%；Ti:0.01~0.04%, remaining is for Fe and inevitably
Impurity.
Its production method comprises the technical steps that: being smelted, is controlled using electric furnace+oxygen gun blowing top-bottom blowing mode
Tapping temperature processed is then refined using LF furnace at 1650~1690 DEG C, and LF bottom blowing N Gas Alloying, while carrying out microalloy
It adjusts, carries out ultimate constituent adjusting in VD furnace, after ingredient is met the requirements, carry out molding casting, then use 70%Al2O3+ 30%
CaF2Binary slag system carries out electroslag remelting in electroslag refining furnace, and to reduce microalloy element process scaling loss amount, Electroslag Process is fixed
Shi Zidong sprays into aluminium powder, 40~50g/20min of additional amount, and whole process uses nitrogen-sealed, ESR ingot natural air cooling after remelting, molding
And electroslag remelting whole process uses nitrogen-sealed, ESR ingot is after heat treatment forged, and chemical component qualification is obtained, and steel is pure
Slab, it is processed to obtain high temperature resistance and high strength drop-bottom stainless steel plate.And as a comparison with traditional stainless steel drop-bottom
Example.
Comparative example
Traditional stainless steel furnace bottom board production technology: being smelted using electric furnace+oxygen gun blowing top-bottom blowing mode, addition
Lime, fluorite and Dephosphorising agent carry out deep de- P, and tapping temperature is at 1658 DEG C.It is then refined using LF furnace, is added in LF furnace
Various alloys carry out alloy adjusting, add lime and fluorite, carry out deep de- S；Add the deoxidation of Al powder；LF furnace overall process uses bottom
The mode of blowing argon gas is stirred.It in VD station, is kept for 20 minutes using 133Pa high vacuum, after vacuum breaker, carries out microalloy tune
Section and addition carbonization rice husk, and soft blow 10 minutes (Ar), then molded.It after steel ingot demoulds slow cooling, is made annealing treatment, is sawed
Mouth and ingot butt portion are capped off, surface of steel ingot is cleared up, removes iron scale, external coating Al powder, after baking, as electroslag mother
Then material electrode material uses 70%Al2O3+ 30%CaF2Binary slag system carries out electroslag remelting in electroslag refining furnace, to reduce
Microalloy element process scaling loss amount, the 20 grams of Al powder of addition in every 10 minutes in esr process；ESR ingot natural air cooling after remelting.
Molding and electroslag remelting whole process use nitrogen-sealed, and then ESR ingot is put into 600 DEG C of temperature heating ovens and is forged, and forge
Process ESR ingot heating process curve is to slowly warm up to 850 DEG C as shown in Fig. 2, heat preservation 5 hours, heating rate be no more than 50 DEG C/
H keeps the temperature 3 hours, after be to slowly warm up to 1220 DEG C, heating rate is no more than 100 DEG C/h, keeps the temperature 4 hours.It is carried out after the completion of forging
Solution treatment, solid solution process heating curve are shown in that Fig. 3, steel plate are put into 600 DEG C of temperature heating ovens, keep the temperature 5 hours, be to slowly warm up to
850 DEG C, be no more than 50 DEG C per hour, keep the temperature 3 hours, after be to slowly warm up to 1130 DEG C, be no more than 100 DEG C per hour, heat preservation is 4 small
When, it is finally processed into the drop-bottom steel billet for meeting user demand, chemical component is shown in Table 1, and mechanical property is shown in Table 2.
Embodiment 1
A kind of high temperature resistance and high strength drop-bottom stainless steel plate, production technology include: compound using electric furnace+oxygen gun blowing
Blowing mode is smelted, addition lime, fluorite and Dephosphorising agent, carries out deep de- P, tapping temperature is at 1655 DEG C.Then use LF
Furnace is refined, and is added various alloys in LF furnace, is carried out alloy adjusting, add lime and fluorite, and deep de- S is carried out；Add Al powder
Deoxidation；LF furnace overall process carries out nitrogen pick-up by the way of bottom blowing nitrogen.In VD station, kept for 20 minutes using 670Pa high vacuum,
After vacuum breaker, FeTi and carbonization rice husk, and soft blow 10 minutes (Ar:N is controlled in 2:1) are added, are then molded.Steel ingot demoulding
It after slow cooling, is made annealing treatment, amputates cap mouth and ingot butt portion, surface of steel ingot is cleared up, remove iron scale, external coating
Al powder after baking, as electroslag base material electrode material, then uses 70%Al2O3+ 30%CaF2Binary slag system is in electroslag remelting
Electroslag remelting is carried out in furnace, to reduce microalloy element process scaling loss amount, the 20 grams of Al of addition in every 10 minutes in esr process
Powder；ESR ingot natural air cooling after remelting.Molding and electroslag remelting whole process use nitrogen-sealed.ESR ingot is then put into 600 DEG C
Forged in temperature heating oven, forging process ESR ingot heating process curve as shown in Fig. 2, heat preservation 5 hours, be to slowly warm up to
850 DEG C, heating rate is no more than 50 DEG C/h, keeps the temperature 3 hours, after be to slowly warm up to 1220 DEG C, heating rate be no more than 100 DEG C/
H keeps the temperature 4 hours.Solution treatment is used after the completion of forging, solid solution process heating curve is shown in that Fig. 3, steel plate are put into 600 DEG C of temperature and add
In hot stove, keep the temperature 5 hours, be to slowly warm up to 850 DEG C, per hour be no more than 50 DEG C, keep the temperature 3 hours, after be to slowly warm up to 1130
DEG C, it is no more than 100 DEG C per hour, keeps the temperature 4 hours, be finally processed into the drop-bottom steel billet for meeting user demand, chemical component
It is shown in Table 1, mechanical property is shown in Table 2.
Embodiment 2
A kind of high temperature resistance and high strength drop-bottom stainless steel plate, production technology include: compound using electric furnace+oxygen gun blowing
Blowing mode is smelted, addition lime, fluorite and Dephosphorising agent, carries out deep de- P, tapping temperature is at 1671 DEG C.Then use LF
Furnace is refined, and is added various alloys in LF furnace, is carried out alloy adjusting, add lime and fluorite, and deep de- S is carried out；Add Al powder
Deoxidation；LF furnace overall process carries out nitrogen pick-up by the way of bottom blowing nitrogen.In VD station, kept for 20 points using 1330Pa high vacuum
Clock after vacuum breaker, adds FeTi and carbonization rice husk, and soft blow 10 minutes (Ar:N is controlled in 2:1), is then molded.Steel ingot
It after demoulding slow cooling, is made annealing treatment, amputates cap mouth and ingot butt portion, surface of steel ingot is cleared up, remove iron scale, surface
Al powder is brushed, after baking, as electroslag base material electrode material, then uses 70%Al2O3+ 30%CaF2Binary slag system is in electroslag
Electroslag remelting, the 20 grams of Al powder of addition in every 10 minutes in esr process are carried out in remelting furnace；ESR ingot natural air cooling after remelting.
Molding and electroslag remelting whole process use nitrogen-sealed.Then ESR ingot is put into 600 DEG C of temperature heating ovens and is forged, is forged
Process ESR ingot heating process curve is to slowly warm up to 850 DEG C as shown in Fig. 2, heat preservation 5 hours, heating rate be no more than 50 DEG C/
H keeps the temperature 3 hours, after be to slowly warm up to 1210 DEG C, heating rate is no more than 100 DEG C/h, keeps the temperature 4 hours.It forges before this steel grade first
Preheat forging equipment, reduce temperature drop, it is cracked to prevent forging, control forging temperature, when temperature be lower than 900 DEG C, melt down plus
Heat, and keep the temperature 3 hours or more, until forging is completed.Solution treatment is used after the completion of forging, solid solution process heating curve is shown in Fig. 3,
Steel plate is put into 600 DEG C of temperature heating ovens, is kept the temperature 5 hours, is to slowly warm up to 850 DEG C, is no more than 50 DEG C per hour, heat preservation 3 is small
When, after be to slowly warm up to 1120 DEG C, per hour be no more than 100 DEG C, keep the temperature 4 hours, be finally processed into the furnace for meeting user demand
Bottom plate steel billet, chemical component are shown in Table 1, and mechanical property is shown in Table 2.
Embodiment 3
A kind of high temperature resistance and high strength drop-bottom stainless steel plate, production technology include: compound using electric furnace+oxygen gun blowing
Blowing mode is smelted, addition lime, fluorite and Dephosphorising agent, carries out deep de- P, tapping temperature is at 1681 DEG C.Then use LF
Furnace is refined, and is added various alloys in LF furnace, is carried out alloy adjusting, add lime and fluorite, and deep de- S is carried out；Add Al powder
Deoxidation；LF furnace overall process carries out nitrogen pick-up by the way of bottom blowing nitrogen.In VD station, kept for 20 points using 3350Pa high vacuum
Clock after vacuum breaker, adds FeTi and carbonization rice husk, and soft blow 10 minutes (Ar:N is controlled in 1:1), is then molded.Steel ingot
It after demoulding slow cooling, is made annealing treatment, amputates cap mouth and ingot butt portion, surface of steel ingot is cleared up, remove iron scale, surface
Al powder is brushed, after baking, as electroslag base material electrode material, then uses 70%Al2O3+ 30%CaF2Binary slag system is in electroslag
Electroslag remelting, the 20 grams of Al powder of addition in every 10 minutes in esr process are carried out in remelting furnace；ESR ingot natural air cooling after remelting.
Molding and electroslag remelting whole process use nitrogen-sealed.Then ESR ingot is put into 600 DEG C of temperature heating ovens and is forged, is forged
Process ESR ingot heating process curve is to slowly warm up to 850 DEG C as shown in Fig. 2, heat preservation 5 hours, heating rate be no more than 50 DEG C/
H keeps the temperature 3 hours, after be to slowly warm up to 1230 DEG C, heating rate is no more than 100 DEG C/h, keeps the temperature 4 hours.It forges before this steel grade first
Preheat forging equipment, reduce temperature drop, it is cracked to prevent forging, control forging temperature, when temperature be lower than 900 DEG C, melt down plus
Heat, and keep the temperature 3 hours or more, until forging is completed.Solution treatment is used after the completion of forging, solid solution process heating curve is shown in Fig. 3,
Steel plate is put into 600 DEG C of temperature heating ovens, is kept the temperature 5 hours, is to slowly warm up to 850 DEG C, is no more than 50 DEG C per hour, heat preservation 3 is small
When, after be to slowly warm up to 1140 DEG C, per hour be no more than 100 DEG C, keep the temperature 4 hours, be finally processed into the furnace for meeting user demand
Bottom plate steel billet, chemical component are shown in Table 1, and mechanical property is shown in Table 2.
Embodiment 4
A kind of high temperature resistance and high strength drop-bottom stainless steel plate, production technology include: compound using electric furnace+oxygen gun blowing
Blowing mode is smelted, addition lime, fluorite and Dephosphorising agent, carries out deep de- P, tapping temperature is at 1685 DEG C.Then use LF
Furnace is refined, and is added various alloys in LF furnace, is carried out alloy adjusting, add lime and fluorite, and deep de- S is carried out；Add Al powder
Deoxidation；LF furnace overall process carries out nitrogen pick-up by the way of bottom blowing nitrogen.In VD station, kept for 20 points using 6700Pa high vacuum
Clock after vacuum breaker, adds FeTi and carbonization rice husk, and soft blow 10 minutes (Ar:N is controlled in 1:1), is then molded.Steel ingot
It after demoulding slow cooling, is made annealing treatment, amputates cap mouth and ingot butt portion, surface of steel ingot is cleared up, remove iron scale, surface
Al powder is brushed, after baking, as electroslag base material electrode material, then uses 70%Al2O3+ 30%CaF2Binary slag system is in electroslag
Electroslag remelting, the 20 grams of Al powder of addition in every 10 minutes in esr process are carried out in remelting furnace；ESR ingot natural air cooling after remelting.
Molding and electroslag remelting whole process use nitrogen-sealed.Then ESR ingot is put into 600 DEG C of temperature heating ovens and is forged, is forged
Process ESR ingot heating process curve is to slowly warm up to 850 DEG C as shown in Fig. 2, heat preservation 5 hours, heating rate be no more than 50 DEG C/
H keeps the temperature 3 hours, after be to slowly warm up to 1220 DEG C, heating rate is no more than 100 DEG C/h, keeps the temperature 4 hours.It forges before this steel grade first
Preheat forging equipment, reduce temperature drop, it is cracked to prevent forging, control forging temperature, when temperature be lower than 900 DEG C, melt down plus
Heat, and keep the temperature 3 hours or more, until forging is completed.Solution treatment is used after the completion of forging, solid solution process heating curve is shown in Fig. 3,
Steel plate is put into 600 DEG C of temperature heating ovens, is kept the temperature 5 hours, is to slowly warm up to 850 DEG C, is no more than 50 DEG C per hour, heat preservation 3 is small
When, after be to slowly warm up to 1130 DEG C, per hour be no more than 100 DEG C, keep the temperature 4 hours, be finally processed into the furnace for meeting user demand
Bottom plate steel billet, chemical component are shown in Table 1, and mechanical property is shown in Table 2.
Embodiment 5
A kind of high temperature resistance and high strength drop-bottom stainless steel plate, production technology include: compound using electric furnace+oxygen gun blowing
Blowing mode is smelted, addition lime, fluorite and Dephosphorising agent, carries out deep de- P, tapping temperature is at 1655 DEG C.Then use LF
Furnace is refined, and is added various alloys in LF furnace, is carried out alloy adjusting, add lime and fluorite, and deep de- S is carried out；Add Al powder
Deoxidation；LF furnace overall process carries out nitrogen pick-up by the way of bottom blowing nitrogen.In VD station, kept for 20 points using 5200Pa high vacuum
Clock after vacuum breaker, adds FeTi and carbonization rice husk, and soft blow 10 minutes (Ar:N is controlled in 1:1), is then molded.Steel ingot
It after demoulding slow cooling, is made annealing treatment, amputates cap mouth and ingot butt portion, surface of steel ingot is cleared up, remove iron scale, surface
Al powder is brushed, after baking, as electroslag base material electrode material, then uses 70%Al2O3+ 30%CaF2Binary slag system is in electroslag
Electroslag remelting, the 20 grams of Al powder of addition in every 10 minutes in esr process are carried out in remelting furnace；ESR ingot natural air cooling after remelting.
Molding and electroslag remelting whole process use nitrogen-sealed.Then ESR ingot is put into 600 DEG C of temperature heating ovens and is forged, is forged
Process ESR ingot heating process curve is to slowly warm up to 850 DEG C as shown in Fig. 2, heat preservation 5 hours, heating rate be no more than 50 DEG C/
H keeps the temperature 3 hours, after be to slowly warm up to 1220 DEG C, heating rate is no more than 100 DEG C/h, keeps the temperature 4 hours.It forges before this steel grade first
Preheat forging equipment, reduce temperature drop, it is cracked to prevent forging, control forging temperature, when temperature be lower than 900 DEG C, melt down plus
Heat, and keep the temperature 3 hours or more, until forging is completed.Solution treatment is used after the completion of forging, solid solution process heating curve is shown in Fig. 3,
Steel plate is put into 600 DEG C of temperature heating ovens, is kept the temperature 5 hours, is to slowly warm up to 850 DEG C, is no more than 50 DEG C per hour, heat preservation 3 is small
When, after be to slowly warm up to 1130 DEG C, per hour be no more than 100 DEG C, keep the temperature 4 hours, be finally processed into the furnace for meeting user demand
Bottom plate steel billet, chemical component are shown in Table 1, and mechanical property is shown in Table 2.
The chemical component (%) of 1 comparative example of table and the stainless steel plate of embodiment 1-5 preparation
The mechanical property of 2 comparative example of table and the stainless steel plate of embodiment 1-5 preparation
As can be seen from the above results the stainless steel plate room temperature and elevated temperature strength of 1-5 of embodiment of the present invention preparation are above comparison
The stainless steel plate intensity of example preparation, room-temperature mechanical property are as follows: Rp0.2For 335~357MPa, RmIt is for 626~651MPa, A
56.0~72.5%, Z are mechanical property at 63~73%, 1000 DEG C are as follows: Rp0.2For 54~63MPa, RmIt is for 79~85MPa, Z
Mechanical property at 83.0~94.0%, 1200 DEG C are as follows: Rp0.2For 19~22MPa, RmIt is 80.5~92.0% for 29~33MPa, Z；
Service life also greatly improves, and is extended to 36~46 months by 18 months, and with the increase of nitrogen content, service life has increasing
The trend added.
Claims (6)
1. a kind of high temperature resistance and high strength drop-bottom stainless steel plate, which is characterized in that the drop-bottom stainless steel plate is in high temperature
Yield strength >=30MPa, component and weight percent content at 1200 DEG C are as follows: C:0.05~0.08%；Si:0.40~
0.80%；Mn:1.00~1.60%；P, S :≤0.010%；N:0.02~0.09%；Ni:10.0~12.0%；Cr:22.00
~24%；Mo:0.10~0.50%；Nb:0.02~0.05%；V:0.040~0.090%；Ti:0.01~0.04%, remaining
For Fe and inevitable impurity.
2. high temperature resistance and high strength drop-bottom stainless steel plate according to claim 1, which is characterized in that its component and weight
Degree are as follows: C:0.05~0.07%；Si:0.50~0.70%；Mn:1.00~1.60%；P, S :≤0.010%；N:
0.03~0.08%；Ni:11.0~12.0%；Cr:22.00~24%；Mo:0.20~0.40%；Nb:0.02~0.04%；
V:0.050~0.070%；Ti:0.02~0.03%, remaining is Fe and inevitable impurity.
3. high temperature resistance and high strength drop-bottom stainless steel plate according to claim 1, which is characterized in that the high temperature resistant is high
For intensity drop-bottom stainless steel plate with a thickness of 1000~2000mm, diameter is 1000~2500mm.
4. a kind of production method of any high temperature resistance and high strength drop-bottom stainless steel plate of claim 1-3, feature
It is, comprises the technical steps that: being smelted using electric furnace+oxygen gun blowing top-bottom blowing mode, control tapping temperature exists
It 1650~1690 DEG C, is then refined using LF furnace, and LF bottom blowing N Gas Alloying, while carrying out microalloy adjusting, in VD furnace
The nitrogen content in steel is adjusted by control vacuum pressure, after ingredient is met the requirements, carries out molding casting, then uses 70%
Al2O3+ 30%CaF2Binary slag system carries out electroslag remelting in electroslag refining furnace, and esr process timing is automatic to spray into aluminium powder,
40~50g/20min of additional amount, whole process use nitrogen-sealed, and ESR ingot natural air cooling after remelting, molding and electroslag remelting are whole
It using nitrogen-sealed, is then forged, solution treatment is carried out after the completion of forging, obtain chemical component qualification, steel is pure
Slab, it is processed to obtain high temperature resistance and high strength drop-bottom stainless steel plate.
5. production method according to claim 4, which is characterized in that the forging process heating process are as follows: by ESR ingot
It is put into 600 DEG C of temperature heating ovens, keeps the temperature 5 hours, be to slowly warm up to 850 DEG C, heating rate is no more than 50 DEG C/h, and heat preservation 3 is small
When, after be to slowly warm up to 1220 ± 10 DEG C, heating rate is no more than 100 DEG C/h, keeps the temperature 4 hours.
6. production method according to claim 4, which is characterized in that the solution treatment process heating process are as follows: will be electric
Slag ingot is put into 600 DEG C of heating furnaces, keeps the temperature 5 hours, is to slowly warm up to 850 DEG C, and heating rate is no more than 50 DEG C/h, and heat preservation 3 is small
When, after be to slowly warm up to 1130 ± 10 DEG C, heating rate is no more than 100 DEG C/h, keeps the temperature 4 hours.
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| CN111549276A (en) * | 2020-05-06 | 2020-08-18 | 山西太钢不锈钢股份有限公司 | Grain size control method for high-carbon austenitic stainless steel medium plate |
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